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1,169 results on '"Burnett, T. H."'

1. Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)

Author

Ballet, J., Bruel, P., Burnett, T. H., Lott, B., and collaboration, The Fermi-LAT

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present an incremental version (4FGL-DR4, for Data Release 4) of the fourth Fermi-LAT catalog containing 7194 gamma-ray sources. Based on the first 14 years of science data in the energy range from 50 MeV to 1 TeV, it uses the same analysis methods as the 4FGL-DR3 catalog did for 12 years of data, with only a few improvements. The spectral parameters, spectral energy distributions, light curves and associations are updated for all sources. We add four new extended sources and modify two existing ones. Among the 6658 4FGL-DR3 sources, we delete 14 and change the localization of 10, while 32 are newly associated, eleven associations are changed and three associations are discarded. We add 546 point sources, among which 8 are considered identified and 229 have a plausible counterpart at other wavelengths. Most are just above the detection threshold, and 14 are transient sources below the detection threshold that can affect the light curves of nearby sources., Comment: Data files at https://fermi.gsfc.nasa.gov/ssc/data/access/lat/14yr_catalog/. Refereed paper is DOI 10.3847/1538-4365/ac6751

Published
2023

2. Timing of Eight Binary Millisecond Pulsars Found with Arecibo in Fermi-LAT Unidentified Sources

Author

Deneva, J. S., Ray, P. S., Camilo, F., Freire, P. C. C., Cromartie, H. T., Ransom, S. M., Ferrara, E., Kerr, M., Burnett, T. H., and Parkinson, P. M. Saz

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present timing solutions for eight binary millisecond pulsars (MSPs) discovered by searching unidentified Fermi-LAT source positions with the 327 MHz receiver of the Arecibo 305-m radio telescope. Five of the pulsars are "spiders" with orbital periods shorter than 8.1 h. Three of these are in "black widow" systems (with degenerate companions of 0.02-0.03 solar masses), one is in a "redback" system (with a non-degenerate companion of $\gtrsim 0.3$ solar masses), and one (J1908+2105) is an apparent middle-ground case between the two observational classes. The remaining three pulsars have white dwarf companions and longer orbital periods. With the initially derived radio timing solutions, we detected gamma-ray pulsations from all MSPs and extended the timing solutions using photons from the full Fermi mission, thus confirming the identification of these MSPs with the Fermi-LAT sources. The radio emission of the redback is eclipsed during 50% of its orbital period, which is typical for this kind of system. Two of the black widows exhibit radio eclipses lasting for 10-20% of the orbit, while J1908+2105 eclipses for 40% of the orbit. We investigate an apparent link between gamma-ray emission and a short orbital period among known binary MSPs in the Galactic disk, and conclude that selection effects cannot be ruled out as the cause. Based on this analysis we outline how the likelihood of new MSP discoveries can be improved in ongoing and future pulsar searches., Comment: 23 pages, 8 figures; accepted for publication in the Astrophysical Journal

Published
2020
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3. Fermi Large Area Telescope Fourth Source Catalog Data Release 2

Author

Ballet, J., Burnett, T. H., Digel, S. W., and Lott, B.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present an incremental version (4FGL-DR2, for Data Release 2) of the fourth Fermi-LAT catalog of gamma-ray sources. Based on the first ten years of science data in the energy range from 50 MeV to 1 TeV, it uses the same analysis methods as the 4FGL catalog did for eight years of data. The spectral parameters, spectral energy distributions and associations are updated for all sources. Light curves are rebuilt for all sources with 1-year intervals (not 2-month intervals). Among the 5064 4FGL sources, 120 are formally below the detection threshold over 10 years (but are kept in the list), while 53 are newly associated and four associations were withdrawn. We report 723 new sources, mostly just above the detection threshold, among which two are considered identified and 341 have a plausible counterpart at other wavelengths., Comment: data files at https://fermi.gsfc.nasa.gov/ssc/data/access/lat/10yr_catalog/; Refereed paper is DOI 10.3847/1538-4365/ab6bcb

Published
2020

4. Timing of PSR J2055+3829, an eclipsing black widow pulsar discovered with the Nan\c{c}ay Radio Telescope

Author

Guillemot, L., Octau, F., Cognard, I., Desvignes, G., Freire, P. C. C., Smith, D. A., Theureau, G., and Burnett, T. H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

We report on the timing observations of the millisecond pulsar PSR J2055+3829 originally discovered as part of the SPAN512 survey conducted with the Nan\c{c}ay Radio Telescope. The pulsar has a rotational period of 2.089 ms, and is in a tight 3.1 hr orbit around a very low mass ($0.023 \leq m_c \lesssim 0.053$ M$_\odot$, 90\% c.l.) companion. Our 1.4 GHz observations reveal the presence of eclipses of the pulsar's radio signal caused by the outflow of material from the companion, for a few minutes around superior conjunction of the pulsar. The very low companion mass, the observation of radio eclipses, and the detection of time variations of the orbital period establish PSR J2055+3829 as a `black widow' (BW) pulsar. Inspection of the radio signal from the pulsar during ingress and egress phases shows that the eclipses in PSR J2055+3829 are asymmetric and variable, as is commonly observed in other similar systems. More generally, the orbital properties of the new pulsar are found to be very similar to those of other known eclipsing BW pulsars. No gamma-ray source is detected at the location of the pulsar in recent \textit{Fermi}-LAT source catalogs. We used the timing ephemeris to search ten years of \textit{Fermi} Large Area Telescope (LAT) data for gamma-ray pulsations, but were unable to detect any, possibly because of the pulsar's large distance. We finally compared the mass functions of eclipsing and non-eclipsing BW pulsars and confirmed previous findings that eclipsing BWs have higher mass functions than their non-eclipsing counterparts. Larger inclinations could explain the higher mass functions of eclipsing BWs. On the other hand, the mass function distributions of Galactic disk and globular cluster BWs appear to be consistent, suggesting, despite the very different environments, the existence of common mechanisms taking place in the last stages of evolution of BWs., Comment: 10 pages, 7 figures. Accepted for publication in A&A. Abstract shortened to match arXiv requirements

Published
2019
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5. Fermi-LAT improved Pass~8 event selection

Author

Bruel, P., Burnett, T. H., Digel, S. W., Johannesson, G., Omodei, N., and Wood, M.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The current version of the Fermi Large Area Telescope data (P8R2) has been publicly available since June 2015, with the caveat that the residual background of all event classes, except ULTRACLEANVETO, was not fully isotropic: it was enhanced by a factor ~2 at 1-3 GeV within ~20 deg of the Ecliptic compared to the poles. By investigating the residual background using data only, we were able to find two sources of residual background: one due to non-interacting heavy ions and one due to cosmic-ray electrons leaking through the ribbons of the Anti-Coincidence Detector, the latter source being responsible for the background anisotropy. A set of simple cuts allows us to reject these events while losing less than 1% of the SOURCE class acceptance. This new selection has been used to produce a new version of the LAT data (P8R3)., Comment: This paper corresponds to a poster that was presented at the 8th International Fermi Symposium, October 14-19 2018, Baltimore

Published
2018

6. An image-based search for pulsars among Fermi unassociated LAT sources

Author

Frail, D. A., Ray, P. S., Mooley, K. P., Hancock, P., Burnett, T. H., Jagannathan, P., Ferrara, E. C., Intema, H. T., de Gasperin, F., Demorest, P. B., Stovall, K., and McKinnon, M. M.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We describe an image-based method that uses two radio criteria, compactness and spectral index, to identify promising pulsar candidates among Fermi Large Area Telescope (LAT) unassociated sources. These criteria are applied to those radio sources from the Giant Metrewave Radio Telescope all-sky survey at 150 MHz (TGSS ADR1) found within the error ellipses of unassociated sources from the 3FGL catalog and a preliminary source list based on 7 years of LAT data. After follow-up interferometric observations to identify extended or variable sources, a list of 16 compact, steep-spectrum candidates is generated. An ongoing search for pulsations in these candidates, in gamma rays and radio, has found six millisecond pulsars and one normal pulsar. A comparison of this method with existing selection criteria based on gamma-ray spectral and variability properties suggests that the pulsar discovery space using Fermi may be larger than previously thought. Radio imaging is a hitherto underutilized source selection method that can be used, as with other multi-wavelength techniques, in the search for Fermi pulsars., Comment: MNRAS, in press (13 pages, 12 figures, 4 tables)

Published
2017
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7. LOFAR discovery of the fastest-spinning millisecond pulsar in the Galactic field

Author

Bassa, C. G., Pleunis, Z., Hessels, J. W. T., Ferrara, E. C., Breton, R. P., Gusinskaia, N. V., Kondratiev, V. I., Sanidas, S., Nieder, L., Clark, C. J., Li, T., van Amesfoort, A. S., Burnett, T. H., Camilo, F., Michelson, P. F., Ransom, S. M., Ray, P. S., and Wood, K.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report the discovery of PSR J0952$-$0607, a 707-Hz binary millisecond pulsar which is now the fastest-spinning neutron star known in the Galactic field (i.e., outside of a globular cluster). PSR J0952$-$0607 was found using LOFAR at a central observing frequency of 135 MHz, well below the 300 MHz to 3 GHz frequencies typically used in pulsar searches. The discovery is part of an ongoing LOFAR survey targeting unassociated Fermi Large Area Telescope $\gamma$-ray sources. PSR J0952$-$0607 is in a 6.42-hr orbit around a very low-mass companion ($M_\mathrm{c}\gtrsim0.02$ M$_\odot$) and we identify a strongly variable optical source, modulated at the orbital period of the pulsar, as the binary companion. The light curve of the companion varies by 1.6 mag from $r^\prime=22.2$ at maximum to $r^\prime>23.8$, indicating that it is irradiated by the pulsar wind. Swift observations place a 3-$\sigma$ upper limit on the $0.3-10$ keV X-ray luminosity of $L_X < 1.1 \times 10^{31}$ erg s$^{-1}$ (using the 0.97 kpc distance inferred from the dispersion measure). Though no eclipses of the radio pulsar are observed, the properties of the system classify it as a black widow binary. The radio pulsed spectrum of PSR J0952$-$0607, as determined through flux density measurements at 150 and 350 MHz, is extremely steep with $\alpha\sim-3$ (where $S \propto \nu^{\alpha}$). We discuss the growing evidence that the fastest-spinning radio pulsars have exceptionally steep radio spectra, as well as the prospects for finding more sources like PSR J0952$-$0607., Comment: 9 pages, 3 figures, 1 table, published in ApJ letters

Published
2017
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8. The Nature of Transition Blazars

Author

Ruan, J. J., Anderson, S. F., Plotkin, R. M., Brandt, W. N., Burnett, T. H., Myers, A. D., and Schneider, D. P.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Blazars are classically divided into the BL Lac (BLL) and Flat-Spectrum Radio Quasar (FSRQ) subclasses, corresponding to radiatively inefficient and efficient accretion regimes, respectively, largely based on the equivalent width (EW) of their optical broad emission lines (BEL). However, EW-based classification criteria are not physically motivated, and a few blazars have previously 'transitioned' from one subclass to the other. We present the first systematic search for these transition blazars in a sample of 602 unique pairs of repeat spectra of 354 blazars in SDSS, finding six clear cases. These transition blazars have bolometric Eddington ratios of ~0.3 and low-frequency synchrotron peaks, and are thus FSRQ-like. We show that the strong EW variability (up to an unprecedented factor of >60) is due to swamping of the BELs from variability in jet continuum emission, which is stronger in amplitude and shorter in timescale than typical blazars. Although these transition blazars appear to switch between FSRQ and BLL according to the phenomenologically-based EW scheme, we show that they are most likely rare cases of FSRQs with radiatively efficient accretion flows and especially strongly-beamed jets. These results have implications for the decrease of the apparent BLL population at high-redshifts, and may add credence to claims of a negative BLL redshift evolution., Comment: 14 pages, 11 Figures, ApJ accepted

Published
2014
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9. The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars

Author

Smith, D. A., primary, Abdollahi, S., additional, Ajello, M., additional, Bailes, M., additional, Baldini, L., additional, Ballet, J., additional, Baring, M. G., additional, Bassa, C., additional, Gonzalez, J. Becerra, additional, Bellazzini, R., additional, Berretta, A., additional, Bhattacharyya, B., additional, Bissaldi, E., additional, Bonino, R., additional, Bottacini, E., additional, Bregeon, J., additional, Bruel, P., additional, Burgay, M., additional, Burnett, T. H., additional, Cameron, R. A., additional, Camilo, F., additional, Caputo, R., additional, Caraveo, P. A., additional, Cavazzuti, E., additional, Chiaro, G., additional, Ciprini, S., additional, Clark, C. J., additional, Cognard, I., additional, Corongiu, A., additional, Orestano, P. Cristarella, additional, Crnogorcevic, M., additional, Cuoco, A., additional, Cutini, S., additional, D’Ammando, F., additional, de Angelis, A., additional, DeCesar, M. E., additional, De Gaetano, S., additional, de Menezes, R., additional, Deneva, J., additional, de Palma, F., additional, Di Lalla, N., additional, Dirirsa, F., additional, Di Venere, L., additional, Domínguez, A., additional, Dumora, D., additional, Fegan, S. J., additional, Ferrara, E. C., additional, Fiori, A., additional, Fleischhack, H., additional, Flynn, C., additional, Franckowiak, A., additional, Freire, P. C. C., additional, Fukazawa, Y., additional, Fusco, P., additional, Galanti, G., additional, Gammaldi, V., additional, Gargano, F., additional, Gasparrini, D., additional, Giacchino, F., additional, Giglietto, N., additional, Giordano, F., additional, Giroletti, M., additional, Green, D., additional, Grenier, I. A., additional, Guillemot, L., additional, Guiriec, S., additional, Gustafsson, M., additional, Harding, A. K., additional, Hays, E., additional, Hewitt, J. W., additional, Horan, D., additional, Hou, X., additional, Jankowski, F., additional, Johnson, R. P., additional, Johnson, T. J., additional, Johnston, S., additional, Kataoka, J., additional, Keith, M. J., additional, Kerr, M., additional, Kramer, M., additional, Kuss, M., additional, Latronico, L., additional, Lee, S.-H., additional, Li, D., additional, Li, J., additional, Limyansky, B., additional, Longo, F., additional, Loparco, F., additional, Lorusso, L., additional, Lovellette, M. N., additional, Lower, M., additional, Lubrano, P., additional, Lyne, A. G., additional, Maan, Y., additional, Maldera, S., additional, Manchester, R. N., additional, Manfreda, A., additional, Marelli, M., additional, Martí-Devesa, G., additional, Mazziotta, M. N., additional, McEnery, J. E., additional, Mereu, I., additional, Michelson, P. F., additional, Mickaliger, M., additional, Mitthumsiri, W., additional, Mizuno, T., additional, Moiseev, A. A., additional, Monzani, M. E., additional, Morselli, A., additional, Negro, M., additional, Nemmen, R., additional, Nieder, L., additional, Nuss, E., additional, Omodei, N., additional, Orienti, M., additional, Orlando, E., additional, Ormes, J. F., additional, Palatiello, M., additional, Paneque, D., additional, Panzarini, G., additional, Parthasarathy, A., additional, Persic, M., additional, Pesce-Rollins, M., additional, Pillera, R., additional, Poon, H., additional, Porter, T. A., additional, Possenti, A., additional, Principe, G., additional, Rainò, S., additional, Rando, R., additional, Ransom, S. M., additional, Ray, P. S., additional, Razzano, M., additional, Razzaque, S., additional, Reimer, A., additional, Reimer, O., additional, Renault-Tinacci, N., additional, Romani, R. W., additional, Sánchez-Conde, M., additional, Parkinson, P. M. Saz, additional, Scotton, L., additional, Serini, D., additional, Sgrò, C., additional, Shannon, R., additional, Sharma, V., additional, Shen, Z., additional, Siskind, E. J., additional, Spandre, G., additional, Spinelli, P., additional, Stappers, B. W., additional, Stephens, T. E., additional, Suson, D. J., additional, Tabassum, S., additional, Tajima, H., additional, Tak, D., additional, Theureau, G., additional, Thompson, D. J., additional, Tibolla, O., additional, Torres, D. F., additional, Valverde, J., additional, Venter, C., additional, Wadiasingh, Z., additional, Wang, N., additional, Wang, P., additional, Weltevrede, P., additional, Wood, K., additional, Yan, J., additional, Zaharijas, G., additional, Zhang, C., additional, and Zhu, W., additional

Published
2023
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10. Modeling the non-recycled Fermi gamma-ray pulsar population

Author

Perera, B. B. P., McLaughlin, M. A., Cordes, J. M., Kerr, M., Burnett, T. H., and Harding, A. K.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We use Fermi Gamma-ray Space Telescope detections and upper limits on non-recycled pulsars obtained from the Large Area Telescope (LAT) to constrain how the gamma-ray luminosity L depends on the period P and the period derivative \dot{P}. We use a Bayesian analysis to calculate a best-fit luminosity law, or dependence of L on P and \dot{P}, including different methods for modeling the beaming factor. An outer gap (OG) magnetosphere geometry provides the best-fit model, which is L \propto P^{-a} \dot{P}^{b} where a=1.36\pm0.03 and b=0.44\pm0.02, similar to but not identical to the commonly assumed L \propto \sqrt{\dot{E}} \propto P^{-1.5} \dot{P}^{0.5}. Given upper limits on gamma-ray fluxes of currently known radio pulsars and using the OG model, we find that about 92% of the radio-detected pulsars have gamma-ray beams that intersect our line of sight. By modeling the misalignment of radio and gamma-ray beams of these pulsars, we find an average gamma-ray beaming solid angle of about 3.7{\pi} for the OG model, assuming a uniform beam. Using LAT-measured diffuse fluxes, we place a 2{\sigma} upper limit on the average braking index and a 2{\sigma} lower limit on the average surface magnetic field strength of the pulsar population of 3.8 and 3.2 X 10^{10} G, respectively. We then predict the number of non-recycled pulsars detectable by the LAT based on our population model. Using the two-year sensitivity, we find that the LAT is capable of detecting emission from about 380 non-recycled pulsars, including 150 currently identified radio pulsars. Using the expected five-year sensitivity, about 620 non-recycled pulsars are detectable, including about 220 currently identified radio pulsars. We note that these predictions significantly depend on our model assumptions., Comment: 26 pages, 10 figures, Accepted by ApJ on 8 September 2013

Published
2013
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11. Characterizing the Optical Variability of Bright Blazars: Variability-Based Selection of Fermi AGN

Author

Ruan, John J., Anderson, Scott F., MacLeod, Chelsea L., Becker, Andrew C., Burnett, T. H., Davenport, James R. A., Ivezic, Zeljko, Kochanek, Christopher S., Plotkin, Richard M., Sesar, Branimir, and Stuart, J. Scott

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We investigate the use of optical photometric variability to select and identify blazars in large-scale time-domain surveys, in part to aid in the identification of blazar counterparts to the ~30% of gamma-ray sources in the Fermi 2FGL catalog still lacking reliable associations. Using data from the optical LINEAR asteroid survey, we characterize the optical variability of blazars by fitting a damped random walk model to individual light curves with two main model parameters, the characteristic timescales of variability (tau), and driving amplitudes on short timescales (sigma). Imposing cuts on minimum tau and sigma allows for blazar selection with high efficiency E and completeness C. To test the efficacy of this approach, we apply this method to optically variable LINEAR objects that fall within the several-arcminute error ellipses of gamma-ray sources in the Fermi 2FGL catalog. Despite the extreme stellar contamination at the shallow depth of the LINEAR survey, we are able to recover previously-associated optical counterparts to Fermi AGN with E > 88% and C = 88% in Fermi 95% confidence error ellipses having semimajor axis r < 8'. We find that the suggested radio counterpart to Fermi source 2FGL J1649.6+5238 has optical variability consistent with other gamma-ray blazars, and is likely to be the gamma-ray source. Our results suggest that the variability of the non-thermal jet emission in blazars is stochastic in nature, with unique variability properties due to the effects of relativistic beaming. After correcting for beaming, we estimate that the characteristic timescale of blazar variability is ~3 years in the rest-frame of the jet, in contrast with the ~320 day disk flux timescale observed in quasars. The variability-based selection method presented will be useful for blazar identification in time-domain optical surveys, and is also a probe of jet physics., Comment: version resubmitted to ApJ with incorporated referee's comments. 12 pages, 10 figures

Published
2012
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12. Search for pair production of the scalar top quark in muon+tau final states

Author

D0 Collaboration, Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., Alkhazov, G., Alton, A., Alverson, G., Aoki, M., Askew, A., Asman, B., Atkins, S., Atramentov, O., Augsten, K., Avila, C., BackusMayes, J., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Belanger-Champagne, C., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bezzubov, V. A., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Bose, T., Brandt, A., Brandt, O., Brock, R., Brooijmans, G., Bross, A., Brown, D., Brown, J., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Burnett, T. H., Buszello, C. P., Calpas, B., Camacho-Perez, E., Carrasco-Lizarraga, M. A., Casey, B. C. K., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Chevalier-Thery, S., Cho, D. K., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C., Croc, A., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dorland, T., Dubey, A., Dudko, L. V., Duggan, D., Duperrin, A., Dutt, S., Dyshkant, A., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Facini, G., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Fuess, S., Garcia-Bellido, A., Garcia-Guerra, G. A., Gavrilov, V., Gay, P., Geng, W., Gerbaudo, D., Gerber, C. E., Gershtein, Y., Ginther, G., Golovanov, G., Goussiou, A., Grannis, P. D., Greder, S., Greenlee, H., Greenwood, Z. D., Gregores, E. M., Grenier, G., Gris, Ph., Grivaz, J. -F., Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haas, A., Hagopian, S., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., La Cruz, I. Heredia-De, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hohlfeld, M., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jamin, D., Jayasinghe, A., Jesik, R., Johns, K., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kaadze, K., Kajfasz, E., Karmanov, D., Kasper, P. A., Katsanos, I., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kohli, J. M., Kozelov, A. V., Kraus, J., Kulikov, S., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Landsberg, G., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lellouch, J., Li, H., Li, L., Li, Q. Z., Lietti, S. M., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Lubatti, H. J., Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Mackin, D., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Maravin, Y., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Muanza, G. S., Mulhearn, M., Nagy, E., Naimuddin, M., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Novaes, S. F., Nunnemann, T., Obrant, G., Orduna, J., Osman, N., Osta, J., Garzon, G. J. Otero y, Padilla, M., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Piegaia, R., Pleier, M. -A., Podesta-Lerma, P. L. M., Podstavkov, V. M., Polozov, P., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Rangel, M. S., Ranjan, K., Ratoff, P. N., Razumov, I., Renkel, P., Rijssenbeek, M., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Safronov, G., Sajot, G., Salcido, P., Sanchez-Hernandez, A., Sanders, M. P., Sanghi, B., Santos, A. S., Savage, G., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schliephake, T., Schlobohm, S., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shchukin, A. A., Shivpuri, R. K., Simak, V., Sirotenko, V., Skubic, P., Slattery, P., Smirnov, D., Smith, K. J., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stolin, V., Stoyanova, D. A., Strauss, M., Strom, D., Stutte, L., Suter, L., Svoisky, P., Takahashi, M., Tanasijczuk, A., Titov, M., Tokmenin, V. V., Tsai, Y. -T., Tschann-Grimm, K., Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verdier, P., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weber, M., Weichert, J., Welty-Rieger, L., White, A., Wicke, D., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, W. -C., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Zhao, T., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
High Energy Physics - Experiment
Abstract

We present a search for the pair production of scalar top quarks ($\tilde{t}_{1}$), the lightest supersymmetric partners of the top quarks, in $p\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV, using data corresponding to an integrated luminosity of {7.3 $fb^{-1}$} collected with the \dzero experiment at the Fermilab Tevatron Collider. Each scalar top quark is assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\tilde{\nu}$). We investigate final states arising from $\tilde{t}_{1} \bar{\tilde{t}_{1}} \rightarrow b\bar{b}\mu\tau \tilde{\nu} \tilde{\nu}$ and $\tilde{t}_{1} \bar{\tilde{t}_{1}} \rightarrow b\bar{b}\tau\tau \tilde{\nu} \tilde{\nu}$. With no significant excess of events observed above the background expected from the standard model, we set exclusion limits on this production process in the ($m_{\tilde{t}_{1}}$,$m_{\tilde{\nu}}$) plane., Comment: Submitted to Phys. Lett. B

Published
2012
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13. Search for Dark Matter Satellites using the FERMI-LAT

Author

The Fermi LAT Collaboration, Ackermann, M., Albert, A., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Brandt, T. J., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Charles, E., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., de Palma, F., Dermer, C. D., Digel, S. W., Silva, E. do Couto e, Drell, P. S., Drlica-Wagner, A., Essig, R., Falletti, L., Favuzzi, C., Fegan, S. J., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Guiriec, S., Gustafsson, M., Hadasch, D., Hayashida, M., Hou, X., Hughes, R. E., Johnson, R. P., Johnson, A. S., Kamae, T., Katagiri, H., Kataoka, J., Knodlseder, J., Kuss, M., Lande, J., Latronico, L., Lee, S. -H., Lionetto, A. M., Garde, M. Llena, Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., McEnery, J. E., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Pelassa, V., Pierbattista, M., Piron, F., Pivato, G., Porter, T. A., Raino, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Ritz, S., Sadrozinski, H. F. -W., Sehgal, N., Sgro, C., Siskind, E. J., Spinelli, P., Strigari, L., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tinivella, M., Torres, D. F., Troja, E., Uchiyama, Y., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Yang, Z., Zalewski, S., and Zimmer, S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Numerical simulations based on the Lambda-CDM model of cosmology predict a large number of as yet unobserved Galactic dark matter satellites. We report the results of a Large Area Telescope (LAT) search for these satellites via the gamma-ray emission expected from the annihilation of weakly interacting massive particle (WIMP) dark matter. Some dark matter satellites are expected to have hard gamma-ray spectra, finite angular extents, and a lack of counterparts at other wavelengths. We sought to identify LAT sources with these characteristics, focusing on gamma-ray spectra consistent with WIMP annihilation through the $b \bar b$ channel. We found no viable dark matter satellite candidates using one year of data, and we present a framework for interpreting this result in the context of numerical simulations to constrain the velocity-averaged annihilation cross section for a conventional 100 GeV WIMP annihilating through the $b \bar b$ channel., Comment: 29 pages, 5 figures, 3 tables; Accepted by ApJ; Contact authors: Alex Drlica-Wagner, Ping Wang, Louie Strigari, and Elliott Bloom

Published
2012
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14. Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope

Author

Collaboration, The Fermi-LAT, Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Canadas, B., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., de Angelis, A., de Palma, F., Dermer, C. D., Digel, S. W., Silva, E. do Couto e, Drell, P. S., Drlica-Wagner, A., Falletti, L., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Guiriec, S., Gustafsson, M., Hadasch, D., Hayashida, M., Hays, E., Hughes, R. E., Jeltema, T. E., Johannesson, G., Johnson, R. P., Johnson, A. S., Kamae, T., Katagiri, H., Kataoka, J., Knödlseder, J., Kuss, M., Lande, J., Latronico, L., Lionetto, A. M., Garde, M. Llena, Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Mazziotta, M. N., McEnery, J. E., Mehault, J., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Naumann-Godo, M., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Parent, D., Pesce-Rollins, M., Pierbattista, M., Piron, F., Pivato, G., Porter, T. A., Profumo, S., Raino, S., Razzano, M., Reimer, A., Reimer, O., Ritz, S., Roth, M., Sadrozinski, H. F. -W., Sbarra, C., Scargle, J. D., Schalk, T. L., Sgro, C., Siskind, E. J., Spandre, G., Spinelli, P., Strigari, L., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Thompson, D. J., Tibaldo, L., Tinivella, M., Torres, D. F., Troja, E., Uchiyama, Y., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Wood, M., Yang, Z., Zimmer, S., Kaplinghat, M., and Martinez, G. D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

Satellite galaxies of the Milky Way are among the most promising targets for dark matter searches in gamma rays. We present a search for dark matter consisting of weakly interacting massive particles, applying a joint likelihood analysis to 10 satellite galaxies with 24 months of data of the Fermi Large Area Telescope. No dark matter signal is detected. Including the uncertainty in the dark matter distribution, robust upper limits are placed on dark matter annihilation cross sections. The 95% confidence level upper limits range from about 1e-26 cm^3 s^-1 at 5 GeV to about 5e-23 cm^3 s^-1 at 1 TeV, depending on the dark matter annihilation final state. For the first time, using gamma rays, we are able to rule out models with the most generic cross section (~3e-26 cm^3 s^-1 for a purely s-wave cross section), without assuming additional boost factors., Comment: 6 pages, 2 figures; Contact authors: Johann Cohen-Tanugi, Jan Conrad, and Maja Llena Garde

Published
2011
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15. Broad Line Radio Galaxies Observed with Fermi-LAT: The Origin of the GeV Gamma-Ray Emission

Author

Kataoka, J., Stawarz, L., Takahashi, Y., Cheung, C. C., Hayashida, M., Grandi, P., Burnett, T. H., Celotti, A., Fegan, S. J., Fortin, P., Maeda, K., Nakamori, T., Taylor, G. B., Tosti, G., Digel, S. W., McConville, W., Finke, J., and D'Ammando, F.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on a detailed investigation of the gamma-ray emission from 18 broad line radio galaxies (BLRGs) based on two years of Fermi Large Area Telescope (LAT) data. We confirm the previously reported detections of 3C 120 and 3C 111 in the GeV photon energy range; a detailed look at the temporal characteristics of the observed gamma-ray emission reveals in addition possible flux variability in both sources. No statistically significant gamma-ray detection of the other BLRGs was however found in the considered dataset. Though the sample size studied is small, what appears to differentiate 3C 111 and 3C 120 from the BLRGs not yet detected in gamma-rays is the particularly strong nuclear radio flux. This finding, together with the indications of the gamma-ray flux variability and a number of other arguments presented, indicate that the GeV emission of BLRGs is most likely dominated by the beamed radiation of relativistic jets observed at intermediate viewing angles. In this paper we also analyzed a comparison sample of high accretion-rate Seyfert 1 galaxies, which can be considered radio-quiet counterparts of BLRGs, and found none were detected in gamma-rays. A simple phenomenological hybrid model applied for the broad-band emission of the discussed radio-loud and radio-quiet type 1 active galaxies suggests that the relative contribution of the nuclear jets to the accreting matter is > 1 percent on average for BLRGs, whilst <0.1 percent for Seyfert 1 galaxies., Comment: 18 pages, 9 figures, accepted for publication in the ApJ

Published
2011
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16. Identification of gamma-ray emission from 3C345 and NRAO512

Author

Schinzel, F. K., Sokolovsky, K. V., D'Ammando, F., Burnett, T. H., Max-Moerbeck, W., Cheung, C. C., Fegan, S. J., Casandjian, J. M., Reyes, L. C., Villata, M., Raiteri, C. M., Agudo, I., Calle, O. J. A. Bravo, Carosati, D., Casas, R., Gomez, J. L., Gurwell, M. A., Hsiao, H. Y., Jorstad, S. G., Kimeridze, G., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O. M., Kurtanidze, S. O., Larionov, V. M., Larionova, E. G., Larionova, L. V., Marscher, A. P., Morozova, D. A., Nikolashvili, M. G., Roca-Sogorb, M., Ros, J. A., Sigua, L. A., Spiridonova, O., Troitsky, I. S., Vlasyuk, V. V., Lobanov, A. P., and Zensus, J. A.

Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991-2000), it has remained an open question why the prominent blazar 3C 345 was not reliably detected at gamma-ray energies <=20 MeV. Recently a bright gamma-ray source (0FGL J1641.4+3939/1FGL J1642.5+3947), potentially associated with 3C 345, was detected by the Large Area Telescope (LAT) on Fermi. Multiwavelength observations from radio bands to X-rays (mainly GASP-WEBT and Swift) of possible counterparts (3C 345, NRAO 512, B3 1640+396) were combined with 20 months of Fermi-LAT monitoring data (August 2008 - April 2010) to associate and identify the dominating gamma-ray emitting counterpart of 1FGL J1642.5+3947. The source 3C 345 is identified as the main contributor for this gamma-ray emitting region. However, after November 2009 (15 months), a significant excess of photons from the nearby quasar NRAO 512 started to contribute and thereafter was detected with increasing gamma-ray activity, possibly adding flux to 1FGL J1642.5+3947. For the same time period and during the summer of 2010, an increase of radio, optical and X-ray activity of NRAO 512 was observed. No gamma-ray emission from B3 1640+396 was detected., Comment: 11 pages, 5 figures, 5 tables, accepted for publication in A&A

Published
2011
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17. Precise measurement of the top quark mass in the dilepton channel at D0

Author

D0 Collaboration, Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., Alkhazov, G., Alton, A., Alverson, G., Alves, G. A., Ancu, L. S., Aoki, M., Arov, M., Askew, A., Åsman, B., Atramentov, O., Avila, C., BackusMayes, J., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J. F., Bassler, U., Bazterra, V., Beale, S., Bean, A., Begalli, M., Begel, M., Belanger-Champagne, C., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bezzubov, V. A., Bhat, P. C., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Bose, T., Brandt, A., Brandt, O., Brock, R., Brooijmans, G., Bross, A., Brown, D., Brown, J., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Burnett, T. H., Buszello, C. P., Calpas, B., Camacho-Pérez, E., Carrasco-Lizarraga, M. A., Casey, B. C. K., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K. M., Chandra, A., Chen, G., Chevalier-Théry, S., Cho, D. K., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C., Croc, A., Cutts, D., Das, A., Davies, G., De, K., de Jong, S. J., De La Cruz-Burelo, E., Déliot, F., Demarteau, M., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Dominguez, A., Dorland, T., Dubey, A., Dudko, L. V., Duggan, D., Duperrin, A., Dutt, S., Dyshkant, A., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Facini, G., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Fuess, S., Garcia-Bellido, A., Gavrilov, V., Gay, P., Geng, W., Gerbaudo, D., Gerber, C. E., Gershtein, Y., Ginther, G., Golovanov, G., Goussiou, A., Grannis, P. D., Greder, S., Greenlee, H., Greenwood, Z. D., Gregores, E. M., Grenier, G., Gris, Ph., Grivaz, J. -F., Grohsjean, A., Grünendahl, S., Grünewald, M. W., Guillemin, T., Guo, F., Gutierrez, G., Gutierrez, P., Haas, A., Hagopian, S., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., La Cruz, I. Heredia-De, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hohlfeld, M., Hubacek, Z., Huske, N., Hynek, V., Iashvili, I., Illingworth, R., Ito, A. S., Jabeen, S., Jaffré, M., Jamin, D., Jayasinghe, A., Jesik, R., Johns, K., Johnson, M., Johnston, D., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kaadze, K., Kajfasz, E., Karmanov, D., Kasper, P. A., Katsanos, I., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Khatidze, D., Kirby, M. H., Kohli, J. M., Kozelov, A. V., Kraus, J., Kulikov, S., Kumar, A., Kupco, A., Kurča, T., Kuzmin, V. A., Kvita, J., Lammers, S., Landsberg, G., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lellouch, J., Li, L., Li, Q. Z., Lietti, S. M., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, Y., Liu, Z., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Lubatti, H. J., Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Mackin, D., Madar, R., Magaña-Villalba, R., Malik, S., Malyshev, V. L., Maravin, Y., Martínez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Muanza, G. S., Mulhearn, M., Nagy, E., Naimuddin, M., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Novaes, S. F., Nunnemann, T., Obrant, G., Orduna, J., Osman, N., Osta, J., Garzón, G. J. Otero y, Padilla, M., Pal, A., Parashar, N., Parihar, V., Park, S. K., Parsons, J., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, K., Peters, Y., Petridis, K., Petrillo, G., Pétroff, P., Piegaia, R., Piper, J., Pleier, M. -A., Podesta-Lerma, P. L. M., Podstavkov, V. M., Polozov, P., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Protopopescu, S., Qian, J., Quadt, A., Quinn, B., Rangel, M. S., Ranjan, K., Ratoff, P. N., Razumov, I., Renkel, P., Rijssenbeek, M., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Safronov, G., Sajot, G., Salcido, P., Sánchez-Hernández, A., Sanders, M. P., Sanghi, B., Santos, A. S., Savage, G., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schliephake, T., Schlobohm, S., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shchukin, A. A., Shivpuri, R. K., Simak, V., Sirotenko, V., Skubic, P., Slattery, P., Smirnov, D., Smith, K. J., Snow, G. R., Snow, J., Snyder, S., Söldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stolin, V., Stoyanova, D. A., Strauss, M., Strom, D., Stutte, L., Suter, L., Svoisky, P., Takahashi, M., Tanasijczuk, A., Taylor, W., Titov, M., Tokmenin, V. V., Tsai, Y. -T., Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verdier, P., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weber, M., Welty-Rieger, L., White, A., Wicke, D., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Xu, C., Yacoob, S., Yamada, R., Yang, W. -C., Yasuda, T., Yatsunenko, Y. A., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J., Zelitch, S., Zhao, T., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
High Energy Physics - Experiment
Abstract

We measure the top quark mass (mt) in ppbar collisions at a center of mass energy of 1.96 TeV using dilepton ttbar->W+bW-bbar->l+nubl-nubarbbar events, where l denotes an electron, a muon, or a tau that decays leptonically. The data correspond to an integrated luminosity of 5.4 fb-1 collected with the D0 detector at the Fermilab Tevatron Collider. We obtain mt = 174.0 +- 1.8(stat) +- 2.4(syst) GeV, which is in agreement with the current world average mt = 173.3 +- 1.1 GeV. This is currently the most precise measurement of mt in the dilepton channel., Comment: 7 pages, 4 figures

Published
2011
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18. HESS J1943+213: a candidate extreme BL Lacertae object

Author

Collaboration, H. E. S. S., Abramowski, A., Acero, F., Aharonian, F., Akhperjanian, A. G., Anton, G., Balzer, A., Barnacka, A., de Almeida, U. Barres, Bazer-Bachi, A. R., Becherini, Y., Becker, J., Behera, B., Bernlöhr, K., Bochow, A., Boisson, C., Bolmont, J., Bordas, P., Borrel, V., Brucker, J., Brun, F., Brun, P., Bulik, T., Büsching, I., Carrigan, S., Casanova, S., Cerruti, M., Chadwick, P. M., Charbonnier, A., Chaves, R. C. G., Cheesebrough, A., Chounet, L. -M., Clapson, A. C., Coignet, G., Colom, P., Conrad, J., Dalton, M., Daniel, M. K., Davids, I. D., Degrange, B., Deil, C., Dickinson, H. J., Djannati-Ataï, A., Domainko, W., Drury, L. O'C., Dubois, F., Dubus, G., Dyks, J., Dyrda, M., Egberts, K., Eger, P., Espigat, P., Fallon, L., Farnier, C., Fegan, S., Feinstein, F., Fernandes, M. V., Fiasson, A., Fontaine, G., Förster, A., Füßling, M., Gallant, Y. A., Gast, H., Gérard, L., Gerbig, D., Giebels, B., Glicenstein, J. F., Glück, B., Goret, P., Göring, D., Häffner, S., Hague, J. D., Hampf, D., Hauser, M., Heinz, S., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J. A., Hoffmann, A., Hofmann, W., Hofverberg, P., Holler, M., Horns, D., Jacholkowska, A., de Jager, O. C., Jahn, C., Jamrozy, M., Jung, I., Kastendieck, M. A., Katarzyński, K., Katz, U., Kaufmann, S., Keogh, D., Khangulyan, D., Khélifi, B., Klochkov, D., Kluźniak, W., Kneiske, T., Komin, Nu., Kosack, K., Kossakowski, R., Laffon, H., Lamanna, G., Lennarz, D., Lohse, T., Lopatin, A., Lu, C. -C., Marandon, V., Marcowith, A., Masbou, J., Maurin, D., Maxted, N., McComb, T. J. L., Medina, M. C., Méhault, J., Nguyen, N., Moderski, R., Moulin, E., Naumann, C. L., Naumann-Godo, M., de Naurois, M., Nedbal, D., Nekrassov, D., Nicholas, B., Niemiec, J., Nolan, S. J., Ohm, S., Olive, J-F., Wilhelmi, E. de Oña, Opitz, B., Ostrowski, M., Panter, M., Arribas, M. Paz, Pedaletti, G., Pelletier, G., Petrucci, P. -O., Pita, S., Pühlhofer, G., Punch, M., Quirrenbach, A., Raue, M., Rayner, S. M., Reimer, A., Reimer, O., Renaud, M., Reyes, R. de los, Rieger, F., Ripken, J., Rob, L., Rosier-Lees, S., Rowell, G., Rudak, B., Rulten, C. B., Ruppel, J., Ryde, F., Sahakian, V., Santangelo, A., Schlickeiser, R., Schöck, F. M., Schönwald, A., Schulz, A., Schwanke, U., Schwarzburg, S., Schwemmer, S., Shalchi, A., Sikora, M., Skilton, J. L., Sol, H., Spengler, G., Stawarz, Ł., Steenkamp, R., Stegmann, C., Stinzing, F., Stycz, K., Sushch, I., Szostek, A., Tavernet, J. -P., Terrier, R., Tibolla, O., Tluczykont, M., Valerius, K., van Eldik, C., Vasileiadis, G., Venter, C., Vialle, J. P., Viana, A., Vincent, P., Vivier, M., Völk, H. J., Volpe, F., Vorobiov, S., Vorster, M., Wagner, S. J., Ward, M., Wierzcholska, A., Zajczyk, A., Zdziarski, A. A., Zech, A., Zechlin, H. -S., Burnett, T. H., and Hill, A. B.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on a newly detected point-like source, HESS J1943+213 located in the Galactic plane. This source coincides with an unidentified hard X-ray source IGR J19443+2117, which was proposed to have radio and infrared counterparts. HESS J1943+213 is detected at the significance level of 7.9 \sigma (post-trials) at RA(J2000)=19h 43m 55s +- 1s (stat) +- 1s (sys), DEC(J2000) = +21deg 18' 8" +- 17" (stat) +- 20" (sys). The source has a soft spectrum with photon index Gamma = 3.1 +- 0.3 (stat) +- 0.2 (sys) and a flux above 470 GeV of 1.3 +- 0.2 (stat) +- 0.3 (sys) x 10^{-12} cm^{-2} s^{-1}. There is no Fermi/LAT counterpart down to a flux limit of 6 x 10^{-9} cm^{-2} s^{-1} in the 0.1-100 GeV energy range (95% confidence upper limit calculated for an assumed power-law model with a photon index Gamma=2.0). The data from radio to VHE gamma-rays do not show any significant variability. We combine new H.E.S.S., Fermi/LAT and Nancay Radio Telescope observations with pre-existing non-simultaneous multi-wavelength observations of IGR J19443+2117 and discuss the likely source associations as well as the interpretation as an active galactic nucleus, a gamma-ray binary or a pulsar wind nebula. The lack of a massive stellar counterpart disfavors the binary hypothesis, while the soft VHE spectrum would be very unusual in case of a pulsar wind nebula. In addition, the distance estimates for Galactic counterparts places them outside of the Milky Way. All available observations favor an interpretation as an extreme, high-frequency peaked BL Lac object with a redshift z>0.14. This would be the first time a blazar is detected serendipitously from ground-based VHE observations, and the first VHE AGN detected in the Galactic Plane., Comment: 10 pages, 7 figures, in press at A&A

Published
2011
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19. Measurement of the W boson helicity in top quark decays using 5.4 fb^-1 of ppbar collision data

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., Alkhazov, G., Altona, A., Alverson, G., Alves, G. A., Ancu, L. S., Aoki, M., Arnoud, Y., Arov, M., Askew, A., Asman, B., Atramentov, O., Avila, C., BackusMayes, J., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J. F., Bassler, U., Bazterra, V., Beale, S., Bean, A., Begalli, M., Begel, M., Belanger-Champagne, C., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bezzubov, V. A., Bhat, P. C., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Bolton, T. A., Boos, E. E., Borissov, G., Bose, T., Brandt, A., Brandt, O., Brock, R., Brooijmans, G., Bross, A., Brown, D., Brown, J., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdinb, S., Burnett, T. H., Buszello, C. P., Calpas, B., Camacho-Perez, E., Carrasco-Lizarraga, M. A., Casey, B. C. K., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K. M., Chandra, A., Chen, G., Chevalier-Thery, S., Cho, D. K., Cho, S. W., Choi, S., Choudhary, B., Christoudias, T., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C., Croc, A., Cutts, D., Cwiok, M., Das, A., Davies, G., De, K., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demarteau, M., Demina, R., Denisov, D., Denisov, S. P., Desai, S., DeVaughan, K., Diehl, H. T., Diesburg, M., Dominguez, A., Dorland, T., Dubey, A., Dudko, L. V., Duggan, D., Duperrin, A., Dutt, S., Dyshkant, A., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Facini, G., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Fuess, S., Gadfort, T., Garcia-Bellido, A., Gavrilov, V., Gay, P., Geist, W., Geng, W., Gerbaudo, D., Gerber, C. E., Gershtein, Y., Ginther, G., Golovanov, G., Goussiou, A., Grannis, P. D., Greder, S., Greenlee, H., Greenwood, Z. D., Gregores, E. M., Grenier, G., Gris, Ph., Grivaz, J. -F., Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guo, F., Gutierrez, G., Gutierrez, P., Haasc, A., Hagopian, S., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., La Cruz, I. Heredia-De, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hohlfeld, M., Hossain, S., Hubacek, Z., Huske, N., Hynek, V., Iashvili, I., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jain, S., Jamin, D., Jesik, R., Johns, K., Johnson, M., Johnston, D., Jonckheere, A., Jonsson, P., Joshi, J., Juste, A., Kaadze, K., Kajfasz, E., Karmanov, D., Kasper, P. A., Katsanos, I., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Khatidze, D., Kirby, M. H., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Kvita, J., Lammers, S., Landsberg, G., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lellouch, J., Li, L., Li, Q. Z., Lietti, S. M., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, Y., Liu, Z., Lobodenko, A., Lokajicek, M., Love, P., Lubatti, H. J., Luna-Garciae, R., Lyon, A. L., Maciel, A. K. A., Mackin, D., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Maravin, Y., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Mondal, N. K., Muanza, G. S., Mulhearn, M., Nagy, E., Naimuddin, M., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Novaes, S. F., Nunnemann, T., Obrant, G., Orduna, J., Osman, N., Osta, J., Garzon, G. J. Otero y, Owen, M., Padilla, M., Pangilinan, M., Parashar, N., Parihar, V., Park, S. K., Parsons, J., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, K., Peters, Y., Petrillo, G., Petroff, P., Piegaia, R., Piper, J., Pleier, M. -A., Podesta-Lerma, P. L. M., Podstavkov, V. M., Pol, M. -E., Polozov, P., Popov, A. V., Prewitt, M., Price, D., Protopopescu, S., Qian, J., Quadt, A., Quinn, B., Rangel, M. S., Ranjan, K., Ratoff, P. N., Razumov, I., Renkel, P., Rich, P., Rijssenbeek, M., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Royon, C., Rubinov, P., Ruchti, R., Safronov, G., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Sanghi, B., Santos, A. S., Savage, G., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schliephake, T., Schlobohm, S., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shchukin, A. A., Shivpuri, R. K., Simak, V., Sirotenko, V., Skubic, P., Slattery, P., Smirnov, D., Smith, K. J., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Sopczak, A., Sosebee, M., Soustruznik, K., Spurlock, B., Stark, J., Stolin, V., Stoyanova, D. A., Strauss, M., Strom, D., Stutte, L., Suter, L., Svoisky, P., Takahashi, M., Tanasijczuk, A., Taylor, W., Titov, M., Tokmenin, V. V., Tsai, Y. -T., Tsybychev, D., Tuchming, B., Tully, C., Tuts, P. M., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verdier, P., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vint, P., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weberg, M., Welty-Rieger, L., White, A., Wicke, D., Williams, M. R. J., Wilson, G. W., Wimpenny, S. J., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Xu, C., Yacoob, S., Yamada, R., Yang, W. -C., Yasuda, T., Yatsunenko, Y. A., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J., Zelitch, S., Zhao, T., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
High Energy Physics - Experiment
Abstract

We present a measurement of the helicity of the W boson produced in top quark decays using ttbar decays in the l+jets and dilepton final states selected from a sample of 5.4 fb^-1 of collisions recorded using the D0 detector at the Fermilab Tevatron ppbar collider. We measure the fractions of longitudinal and right-handed W bosons to be f_0 = 0.669 +- 0.102 [ +- 0.078 (stat.) +- 0.065 (syst.)] and f_+ = 0.023 +- 0.053 [+- 0.041 (stat.) +- 0.034 (syst.)], respectively. This result is consistent at the 98% level with the standard model. A measurement with f_0 fixed to the value from the standard model yields f_+ = 0.010 +- 0.037 [+- 0.022 (stat.) +- 0.030 (syst.) ]., Comment: To be submitted to Phys. Rev. D

Published
2010
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20. Search for pair production of the scalar top quark in the electron-muon final state

Author

Abazov, V. M., Abbott, B., Abolins, M., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., Alkhazov, G., Altona, A., Alverson, G., Alves, G. A., Ancu, L. S., Aoki, M., Arnoud, Y., Arov, M., Askew, A., Åsman, B., Atramentov, O., Avila, C., BackusMayes, J., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J. F., Bassler, U., Bazterra, V., Beale, S., Bean, A., Begalli, M., Begel, M., Belanger-Champagne, C., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bezzubov, V. A., Bhat, P. C., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Bolton, T. A., Boos, E. E., Borissov, G., Bose, T., Brandt, A., Brandt, O., Brock, R., Brooijmans, G., Bross, A., Brown, D., Brown, J., Bu, X. B., Buchholz, D., Buehler, M., Buescher, V., Bunichev, V., Burdinb, S., Burnett, T. H., Buszello, C. P., Calpas, B., Camacho-Pérez, E., Carrasco-Lizarraga, M. A., Casey, B. C. K., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K. M., Chandra, A., Chen, G., Chevalier-Théry, S., Cho, D. K., Cho, S. W., Choi, S., Choudhary, B., Christoudias, T., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C., Croc, A., Cutts, D., Ćwiok, M., Das, A., Davies, G., De, K., de Jong, S. J., De La Cruz-Burelo, E., Déliot, F., Demarteau, M., Demina, 47 R., Denisov, D., Denisov, S. P., Desai, S., DeVaughan, K., Diehl, H. T., Diesburg, M., Dominguez, A., Dorland, T., Dubey, A., Dudko, L. V., Duggan, D., Duperrin, A., Dutt, S., Dyshkant, A., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Eno, S., Evans, H., Evdokimov, A., Evdokimov, V. N., Facini, G., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Fuess, S., Gadfort, T., Garcia-Bellido, A., Gavrilov, V., Gay, P., Geist, W., Geng, W., Gerbaudo, D., Gerber, C. E., Gershtein, Y., Ginther, G., Golovanov, G., Goussiou, A., Grannis, P. D., Greder, S., Greenlee, H., Greenwood, Z. D., Gregores, E. M., Grenier, G., Gris, Ph., Grivaz, J. -F., Grohsjean, A., Grünendahl, S., Grünewald, M. W., Guo, F., Guo, J., Gutierrez, G., Gutierrez, P., Haasc, A., Hagopian, S., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., La Cruz, I. Heredia-De, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hohlfeld, M., Hossain, S., Hubacek, Z., Huske, N., Hynek, V., Iashvili, I., Illingworth, R., Ito, A. S., Jabeen, S., Jaffré, M., Jain, S., Jamin, D., Jesik, R., Johns, K., Johnson, M., Johnston, D., Jonckheere, A., Jonsson, P., Joshi, J., Justed, A., Kaadze, K., Kajfasz, E., Karmanov, D., Kasper, P. A., Katsanos, I., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Khatidze, D., Kirby, M. H., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurča, T., Kuzmin, V. A., Kvita, J., Lammers, S., Landsberg, G., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lellouch, J., Li, L., Li, Q. Z., Lietti, S. M., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, Y., Liu, Z., Lobodenko, A., Lokajicek, M., Love, P., Lubatti, H. J., Luna-Garciae, R., Lyon, A. L., Maciel, A. K. A., Mackin, D., Madar, R., Magaña-Villalba, R., Malik, S., Malyshev, V. L., Maravin, Y., Martínez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Mondal, N. K., Muanza, G. S., Mulhearn, M., Nagy, E., Naimuddin, M., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Novaes, S. F., Nunnemann, T., Obrant, G., Orduna, J., Osman, N., Osta, J., Garzón, G. J. Otero y, Owen, M., Padilla, M., Pangilinan, M., Parashar, N., Parihar, V., Park, S. K., Parsons, J., Partridgec, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, K., Peters, Y., Petrillo, G., Pétroff, P., Piegaia, R., Piper, J., Pleier, M. -A., Podesta-Lermaf, P. L. M., Podstavkov, V. M., Pol, M. -E., Polozov, P., Popov, A. V., Prewitt, M., Price, D., Protopopescu, S., Qian, J., Quadt, A., Quinn, B., Rangel, M. S., Ranjan, K., Ratoff, P. N., Razumov, I., Renkel, P., Rich, P., Rijssenbeek, M., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Royon, C., Rubinov, P., Ruchti, R., Safronov, G., Sajot, G., Sánchez-Hernández, A., Sanders, M. P., Sanghi, B., Santos, A. S., Savage, G., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schliephake, T., Schlobohm, S., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shchukin, A. A., Shivpuri, R. K., Simak, V., Sirotenko, V., Skubic, P., Slattery, P., Smirnov, D., Smith, K. J., Snow, G. R., Snow, J., Snyder, S., Söldner-Rembold, S., Sonnenschein, L., Sopczak, A., Sosebee, M., Soustruznik, K., Spurlock, B., Stark, J., Stolin, V., Stoyanova, D. A., Strauss, E., Strauss, M., Strom, D., Stutte, L., Svoisky, P., Takahashi, M., Tanasijczuk, A., Taylor, W., Titov, M., Tokmenin, V. V., Tsybychev, D., Tuchming, B., Tully, C., Tuts, P. M., Uvarov, L., Uzunyan, S. Uvarov S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verdier, P., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vint, P., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weberg, M., Welty-Rieger, L., Wetstein, M., White, A., Williams, D. Wicke M. R. J., Wilson, G. W., Wimpenny, S. J., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Xu, C., Yacoob, S., Yamada, R., Yang, W. -C., Yasuda, T., Yatsunenko, Y. A., Ye, Z., Yin, H., Yip, K., Yoo, H. D., Youn, S. W., Yu, J., Zelitch, S., Zhao, T., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
High Energy Physics - Experiment
Abstract

We report the result of a search for the pair production of the lightest supersymmetric partner of the top quark ($\tilde{t}_1$) in $p\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider corresponding to an integrated luminosity of 5.4 fb$^{-1}$. The scalar top quarks are assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\tilde{\nu}$), and the search is performed in the electron plus muon final state. No significant excess of events above the standard model prediction is detected, and improved exclusion limits at the 95% C.L. are set in the the ($M_{\tilde{t}_1}$,$M_{\tilde{\nu}}$) mass plane.

Published
2010
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21. Determination of the width of the top quark

Author

Abazov, V. M., Abbott, B., Abolins, M., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., Alkhazov, G., Altona, A., Alverson, G., Alves, G. A., Ancu, L. S., Aoki, M., Arnoud, Y., Arov, M., Askew, A., Åsman, B., Atramentov, O., Avila, C., BackusMayes, J., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J. F., Bassler, U., Bazterra, V., Beale, S., Bean, A., Begalli, M., Begel, M., Belanger-Champagne, C., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bezzubov, V. A., Bhat, P. C., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Bolton, T. A., Boos, E. E., Borissov, G., Bose, T., Brandt, A., Brandt, O., Brock, R., Brooijmans, G., Bross, A., Brown, D., Brown, J., Bu, X. B., Buchholz, D., Buehler, M., Buescher, V., Bunichev, V., Burdinb, S., Burnett, T. H., Buszello, C. P., Calpas, B., Camacho-Pérez, E., Carrasco-Lizarraga, M. A., Casey, B. C. K., Castilla-Valdez, H., Chakrabarti, S., Chakraborty, D., Chan, K. M., Chandra, A., Chen, G., Chevalier-Théry, S., Cho, D. K., Cho, S. W., Choi, S., Choudhary, B., Christoudias, T., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C., Croc, A., Cutts, D., Ćwiok, M., Das, A., Davies, G., De, K., de Jong, S. J., De La Cruz-Burelo, E., Déliot, F., Demarteau, M., Demina, R., Denisov, D., Denisov, S. P., Desai, S., DeVaughan, K., Diehl, H. T., Diesburg, M., Dominguez, A., Dorland, T., Dubey, A., Dudko, L. V., Duggan, D., Duperrin, A., Dutt, S., Dyshkant, A., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Eno, S., Evans, H., Evdokimov, A., Evdokimov, V. N., Facini, G., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Fuess, S., Gadfort, T., Garcia-Bellido, A., Gavrilov, V., Gay, P., Geist, W., Geng, W., Gerbaudo, D., Gerber, C. E., Gershtein, Y., Ginther, G., Golovanov, G., Goussiou, A., Grannis, P. D., Greder, S., Greenlee, H., Greenwood, Z. D., Gregores, E. M., Grenier, G., Gris, Ph., Grivaz, J. -F., Grohsjean, A., Grnendahl, S., Grünewald, M. W., Guo, F., Guo, J., Gutierrez, G., Gutierrez, P., Haasc, A., Hagopian, S., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., La Cruz, I. Heredia-De, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hohlfeld, M., Hossain, S., Hubacek, Z., Huske, N., Hynek, V., Iashvili, I., Illingworth, R., Ito, A. S., Jabeen, S., Jaffré, M., Jain, S., Jamin, D., Jesik, R., Johns, K., Johnson, M., Johnston, D., Jonckheere, A., Jonsson, P., Joshi, J., Justed, A., Kaadze, K., Kajfasz, E., Karmanov, D., Kasper, P. A., Katsanos, I., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Khatidze, D., Kirby, M. H., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurča, T., Kuzmin, V. A., Kvita, J., Lammers, S., Landsberg, G., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lellouch, J., Li, L., Li, Q. Z., Lietti, S. M., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, Y., Liu, Z., Lobodenko, A., Lokajicek, M., Love, P., Lubatti, H. J., Luna-Garciae, R., Lyon, A. L., Maciel, A. K. A., Mackin, D., Madar, R., Magaña-Villalba, R., Malik, S., Malyshev, V. L., Maravin, Y., Martínez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Mondal, N. K., Muanza, G. S., Mulhearn, M., Nagy, E., Naimuddin, M., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Novaes, S. F., Nunnemann, T., Obrant, G., Orduna, J., Osman, N., Osta, J., Garzón, G. J. Otero y, Owen, M., Padilla, M., Pangilinan, M., Parashar, N., Parihar, V., Park, S. K., Parsons, J., Partridgec, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, K., Peters, Y., Petrillo, G., Pétroff, P., Piegaia, R., Piper, J., Pleier, M. -A., Podesta-Lermaf, P. L. M., Podstavkov, V. M., Pol, M. -E., Polozov, P., Popov, A. V., Prewitt, M., Price, D., Protopopescu, S., Qian, J., Quadt, A., Quinn, B., Rangel, M. S., Ranjan, K., Ratoff, P. N., Razumov, I., Renkel, P., Rich, P., Rijssenbeek, M., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Royon, C., Rubinov, P., Ruchti, R., Safronov, G., Sajot, G., Sánchez-Hernández, A., Sanders, M. P., Sanghi, B., Santos, A. S., Savage, G., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schliephake, T., Schlobohm, S., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shchukin, A. A., Shivpuri, R. K., Simak, V., Sirotenko, V., Skubic, P., Slattery, P., Smirnov, D., Smith, K. J., Snow, G. R., Snow, J., Snyder, S., Söldner-Rembold, S., Sonnenschein, L., Sopczak, A., Sosebee, M., Soustruznik, K., Spurlock, B., Stark, J., Stolin, V., Stoyanova, D. A., Strauss, E., Strauss, M., Strom, D., Stutte, L., Svoisky, P., Takahashi, M., Tanasijczuk, A., Taylor, W., Titov, M., Tokmenin, V. V., Tsybychev, D., Tuchming, B., Tully, C., Tuts, P. M., Uvarov, L., Uzunyan, S. Uvarov S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verdier, P., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vint, P., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weberg, M., Welty-Rieger, L., Wetstein, M., White, A., Williams, D. Wicke M. R. J., Wilson, G. W., Wimpenny, S. J., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Xu, C., Yacoob, S., Yamada, R., Yang, W. -C., Yasuda, T., Yatsunenko, Y. A., Ye, Z., Yin, H., Yip, K., Yoo, H. D., Youn, S. W., Yu, J., Zelitch, S., Zhao, T., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
High Energy Physics - Experiment
Abstract

We extract the total width of the top quark, Gamma_t, from the partial decay width Gamma(t -> W b) measured using the t-channel cross section for single top quark production and from the branching fraction B(t -> W b) measured in ttbar events using up to 2.3 fb^-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron ppbar Collider. The result is Gamma_t = 1.99 +0.69 -0.55 GeV, which translates to a top-quark lifetime of tau_t = (3.3 +1.3 -0.9) x 10^-25 s. Assuming a high mass fourth generation b' quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on |Vtb'| < 0.63 at 95% C.L., Comment: submitted to Phys. Rev. Letters

Published
2010
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22. The gamma-ray properties of radio-selected extragalactic jets

Author

Boeck, M., Kadler, M., Tosti, G., Burnett, T. H., Mueller, C., Ojha, R., and Wilms, J.

Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Most extragalactic jets in radio-loud Active Galactic Nuclei are bright and variable gamma-ray sources, which are continuously monitored with Fermi/LAT. We present the gamma-ray properties of the MOJAVE and TANAMI AGN samples of radio-loud AGN. Both programs provide properties of the parsec-scale radio jets using Very Long Baseline Interferometry (VLBI) techniques. This information is important to understand the broad-band emission mechanism of these sources. In this work we compare the radio and gamma -ray properties of the two samples and present upper limits on the gamma-ray flux of the radio-brightest jet sources not yet detected by Fermi/LAT., Comment: Proceedings of the Workshop "Fermi meets Jansky - AGN in Radio and Gamma-Rays", Savolainen, T., Ros, E., Porcas, R.W. & Zensus, J.A. (eds.), MPIfR, Bonn, June 21-23 2010, 4 pages, 3 figures

Published
2010

23. Eight gamma-ray pulsars discovered in blind frequency searches of Fermi LAT data

Author

Parkinson, P. M. Saz, Dormody, M., Ziegler, M., Ray, P. S., Abdo, A. A., Ballet, J., Baring, M. G., Belfiore, A., Burnett, T. H., Caliandro, G. A., Camilo, F., Caraveo, P. A., de Luca, A., Ferrara, E. C., Freire, P. C. C., Grove, J. E., Gwon, C., Harding, A. K., Johnson, R. P., Johnson, T. J., Johnston, S., Keith, M., Kerr, M., Knödlseder, J., Makeev, A., Marelli, M., Michelson, P. F., Parent, D., Ransom, S. M., Reimer, O., Romani, R. W., Smith, D. A., Thompson, D. J., Watters, K., Weltevrede, P., Wolff, M. T., and Wood, K. S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Abstract

We report the discovery of eight gamma-ray pulsars in blind frequency searches using the LAT, onboard the Fermi Gamma-ray Space Telescope. Five of the eight pulsars are young (tau_c<100 kyr), energetic (Edot>10^36 erg/s), and located within the Galactic plane (|b|<3 deg). The remaining three are older, less energetic, and located off the plane. Five pulsars are associated with sources included in the LAT bright gamma-ray source list, but only one, PSR J1413-6205, is clearly associated with an EGRET source. PSR J1023-5746 has the smallest characteristic age (tau_c=4.6 kyr) and is the most energetic (Edot=1.1E37 erg/s) of all gamma-ray pulsars discovered so far in blind searches. PSRs J1957+5033 and J2055+25 have the largest characteristic ages (tau_c~1 Myr) and are the least energetic (Edot~5E33 erg/s) of the newly-discovered pulsars. We present the timing models, light curves, and detailed spectral parameters of the new pulsars. We used recent XMM observations to identify the counterpart of PSR J2055+25 as XMMU J205549.4+253959. In addition, publicly available archival Chandra X-ray data allowed us to identify the likely counterpart of PSR J1023-5746 as a faint, highly absorbed source, CXOU J102302.8-574606. The large X-ray absorption indicates that this could be among the most distant gamma-ray pulsars detected so far. PSR J1023-5746 is positionally coincident with the TeV source HESS J1023-575, located near the young stellar cluster Westerlund 2, while PSR J1954+2836 is coincident with a 4.3 sigma excess reported by Milagro at a median energy of 35 TeV. Deep radio follow-up observations of the eight pulsars resulted in no detections of pulsations and upper limits comparable to the faintest known radio pulsars, indicating that these can be included among the growing population of radio-quiet pulsars in our Galaxy being uncovered by the LAT, and currently numbering more than 20., Comment: Submitted to ApJ

Published
2010
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24. Constraints on Cosmological Dark Matter Annihilation from the Fermi-LAT Isotropic Diffuse Gamma-Ray Measurement

Author

collaboration, The Fermi-LAT, Abdo, A. A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cecchi, C., Elik, O. C., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Silva, E. do Couto e, Drell, P. S., Dubois, R., Dumora, D., Edmonds, Y., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Fortin, P., Frailis, M., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grove, J. E., Guillemot, L., Guiriec, S., Gustafsson, M., Hadasch, D., Harding, A. K., Horan, D., Hughes, R. E., Johnson, A. S., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knodlseder, J., Kuss, M., Lande, J., Latronico, L., Garde, M. Llena, Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Raino, S., Rando, R., Reimer, A., Reimer, O., Reposeur, T., Rodriguez, A. Y., Roth, M., Sadrozinski, H. F. W., Sander, A., Parkinson, P. M. Saz, Scargle, J. D., Sellerholm, A., Sgro, C., Siskind, E. J., Smith, P. D., Spandre, G., Spinelli, P., Starck, J. L., Strickman, M. S., Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Torres, D. F., Uchiyama, Y., Usher, T. L., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Ylinen, T., Zaharijas, G., and Ziegle, M.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

The first published Fermi large area telescope (Fermi-LAT) measurement of the isotropic diffuse gamma-ray emission is in good agreement with a single power law, and is not showing any signature of a dominant contribution from dark matter sources in the energy range from 20 to 100 GeV. We use the absolute size and spectral shape of this measured flux to derive cross section limits on three types of generic dark matter candidates: annihilating into quarks, charged leptons and monochromatic photons. Predicted gamma-ray fluxes from annihilating dark matter are strongly affected by the underlying distribution of dark matter, and by using different available results of matter structure formation we assess these uncertainties. We also quantify how the dark matter constraints depend on the assumed conventional backgrounds and on the Universe's transparency to high-energy gamma-rays. In reasonable background and dark matter structure scenarios (but not in all scenarios we consider) it is possible to exclude models proposed to explain the excess of electrons and positrons measured by the Fermi-LAT and PAMELA experiments. Derived limits also start to probe cross sections expected from thermally produced relics (e.g. in minimal supersymmetry models) annihilating predominantly into quarks. For the monochromatic gamma-ray signature, the current measurement constrains only dark matter scenarios with very strong signals., Comment: 29 pages, 7 figures, to be published in JCAP. Corresponding authors: Jan Conrad, Michael Gustafsson, Alexander Sellerholm, Gabrijela Zaharijas

Published
2010
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25. Fermi LAT Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications

Author

The Fermi LAT Collaboration, Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Bloom, E. D., Bonamente, E., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cecchi, C., Elik, O. C., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Silva, E. do Couto e, Drell, P. S., Drlica-Wagner, A., Dubois, R., Dumora, D., Edmonds, Y., Essig, R., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Fortin, P., Frailis, M., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Gustafsson, M., Hadasch, D., Harding, A. K., Horan, D., Hughes, R. E., Jackson, M. S., ohannesson, G. J ., Johnson, A. S., Johnson, R. P., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., dlseder, J. Kno ., Kuss, M., Lande, J., Latronico, L., Garde, M. Llena, Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Rainó, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Ripken, J., Ritz, S., Rodriguez, A. Y., Roth, M., Sadrozinski, H. F. -W., Sander, A., Parkinson, P. M. Saz, Scargle, J. D., Schalk, T. L., Sellerholm, A., Sgró, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Starck, J. -L., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Tibaldo, L., Torres, D. F., Uchiyama, Y., Usher, T. L., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Ylinen, T., and Ziegler, M.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Dark matter (DM) particle annihilation or decay can produce monochromatic $\gamma$-rays readily distinguishable from astrophysical sources. $\gamma$-ray line limits from 30 GeV to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a $\gamma$-ray line analysis, and integrated over most of the sky. We obtain $\gamma$-ray line flux upper limits in the range $0.6-4.5\times 10^{-9}\mathrm{cm}^{-2}\mathrm{s}^{-1}$, and give corresponding DM annihilation cross-section and decay lifetime limits. Theoretical implications are briefly discussed., Comment: 6 pages, 1 figure. Accepted for publication by The Physical Review Letters

Published
2010
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26. Observations of Milky Way Dwarf Spheroidal galaxies with the Fermi-LAT detector and constraints on Dark Matter models

Author

Collaboration, Fermi-LAT, Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., de Angelis, A., de Palma, F., Digel, S. W., Silva, E. do Couto e, Drell, P. S., Drlica-Wagner, A., Dubois, R., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Fortin, P., Frailis, M., Fukazawa, Y., Fusco, P., Gargano, F., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Gustafsson, M., Harding, A. K., Hays, E., Horan, D., Hughes, R. E., Jackson, M. S., Jeltema, T. E., Johannesson, G., Johnson, A. S., Johnson, R. P., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kerr, M., Knodlseder, J., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Mazziotta, M. N., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Profumo, S., Raino, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rodriguez, A. Y., Roth, M., Sadrozinski, H. F. -W., Sander, A., Parkinson, P. M. Saz, Scargle, J. D., Schalk, T. L., Sellerholm, A., Sgro, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Strickman, M. S., Suson, D. J., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tramacere, A., Uchiyama, Y., Usher, T. L., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Ylinen, T., Ziegler, M., Bullock, James S., Kaplinghat, Manoj, and Martinez, Gregory D.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

We report on the observations of 14 dwarf spheroidal galaxies with the Fermi Gamma-Ray Space Telescope taken during the first 11 months of survey mode operations. The Fermi telescope provides a new opportunity to test particle dark matter models through the expected gamma-ray emission produced by pair annihilation of weakly interacting massive particles (WIMPs). Local Group dwarf spheroidal galaxies, the largest galactic substructures predicted by the cold dark matter scenario, are attractive targets for such indirect searches for dark matter because they are nearby and among the most extreme dark matter dominated environments. No significant gamma-ray emission was detected above 100 MeV from the candidate dwarf galaxies. We determine upper limits to the gamma-ray flux assuming both power-law spectra and representative spectra from WIMP annihilation. The resulting integral flux above 100 MeV is constrained to be at a level below around 10^-9 photons cm^-2 s^-1. Using recent stellar kinematic data, the gamma-ray flux limits are combined with improved determinations of the dark matter density profile in 8 of the 14 candidate dwarfs to place limits on the pair annihilation cross-section of WIMPs in several widely studied extensions of the standard model. With the present data, we are able to rule out large parts of the parameter space where the thermal relic density is below the observed cosmological dark matter density and WIMPs (neutralinos here) are dominantly produced non-thermally, e.g. in models where supersymmetry breaking occurs via anomaly mediation. The gamma-ray limits presented here also constrain some WIMP models proposed to explain the Fermi and PAMELA e^+e^- data, including low-mass wino-like neutralinos and models with TeV masses pair-annihilating into muon-antimuon pairs. (Abridged), Comment: 25 pages, 4 figures, accepted to ApJ, Corresponding authors: J. Cohen-Tanugi, C. Farnier, T.E. Jeltema, E. Nuss, and S. Profumo

Published
2010
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27. Measurement of the Fermi-LAT Localization Performance

Author

Burnett, T. H., Kerr, M., and Roth, M.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present results of a study of the localization capability of Fermi-LAT, using a large set of blazars with precise radio locations. Since the width of the PSF decreases with energy, the performance is typically dominated by a few high energy photons, so it is important to properly characterize the high-energy PSF. Using such data, we have found a need to modify the pre-launch high-energy (greater than a few GeV) PSF derived from extensive Monte Carlo simulations of particle interactions in the LAT; the resulting data-based PSF is shown, Comment: 3 pages, 2009 Fermi Symposium (eConf Proceedings C091122)

Published
2009

28. The Spectral Energy Distribution of Fermi bright blazars

Author

Abdo, A. A., Ackermann, M., Ajello, M., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Celik, O., Charles, E., Chaty, S., Chekhtman, A., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Colafrancesco, S., Cominsky, L. R., Conrad, J., Costamante, L., Cutini, S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Silva, E. do Couto e, Drell, P. S., Dubois, R., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Fortin, P., Frailis, M., Fuhrmann, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giommi, P., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Hadasch, D., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Healey, S. E., Horan, D., Hughes, R. E., Itoh, R., Jackson, M. S., Johannesson, G., Johnson, A. S., Johnson, W. N., Kadler, M., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knodlseder, J., Kocian, M. L., Kuss, M., Lande, J., Latronico, L., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Max-Moerbeck, W., Mazziotta, M. N., McConville, W., McEnery, J. E., Meurer, C., and Michelson, P. F.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

(Abridged) We have conducted a detailed investigation of the broad-band spectral properties of the \gamma-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated Fermi gamma-ray spectra with Swift, radio, infra-red, optical and other hard X-ray/gamma-ray data, collected within three months of the LBAS data taking period, we were able to assemble high-quality and quasi-simultaneous Spectral Energy Distributions (SED) for 48 LBAS blazars.The SED of these gamma-ray sources is similar to that of blazars discovered at other wavelengths, clearly showing, in the usual Log $\nu $ - Log $\nu$ F$_\nu$ representation, the typical broad-band spectral signatures normally attributed to a combination of low-energy synchrotron radiation followed by inverse Compton emission of one or more components. We have used these SEDs to characterize the peak intensity of both the low and the high-energy components. The results have been used to derive empirical relationships that estimate the position of the two peaks from the broad-band colors (i.e. the radio to optical and optical to X-ray spectral slopes) and from the gamma-ray spectral index. Our data show that the synchrotron peak frequency $\nu_p^S$ is positioned between 10$^{12.5}$ and 10$^{14.5}$ Hz in broad-lined FSRQs and between $10^{13}$ and $10^{17}$ Hz in featureless BL Lacertae objects.We find that the gamma-ray spectral slope is strongly correlated with the synchrotron peak energy and with the X-ray spectral index, as expected at first order in synchrotron - inverse Compton scenarios. However, simple homogeneous, one-zone, Synchrotron Self Compton (SSC) models cannot explain most of our SEDs, especially in the case of FSRQs and low energy peaked (LBL) BL Lacs. (...), Comment: 85 pages, 38 figures, submitted to ApJ

Published
2009
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29. WALTA school-network cosmic ray detectors

Author

Gran, Richard, Wilkes, R. Jeffrey, Berns, Hans-Gerd, and Burnett, T. H.

Subjects
Physics - Instrumentation and Detectors, Physics - Physics Education
Abstract

The Washington Area Large-scale Time coincidence Array (WALTA) is placing particle detector arrays in secondary schools in the Seattle area to build up a large-scale ultra-high energy cosmic ray detector network, one of several such projects around the world. Scintillation counters salvaged from the CASA experiment in cooperation with the CROP group at the University of Nebraska at Lincoln are refurbished by teachers and students, tested, calibrated, and installed in four-fold arrays at high school sites. To identify time coincidences, a GPS time synchronization system is employed. Data are acquired using a custom lowcost data acquisition card. Here we will describe the logistics of WALTA and show samples of data taken with a prototype array at the University of Washington., Comment: 4 pages, 4 figures. Presented by R. Gran at IEEE-NSS-2003, Portland, OR, October 2003. Submitted to Trans. IEEE

Published
2003

30. Low-Cost Data Acquisition Card for School-Network Cosmic Ray Detectors

Author

Hansen, Sten, Jordan, Thomas, Kiper, Terry, Claes, Dan, Snow, Gregory, Berns, Hans, Burnett, T. H., Gran, Richard, and Wilkes, R. Jeffrey

Subjects
Physics - Instrumentation and Detectors
Abstract

The Cosmic Ray Observatory Project (CROP) at University of Nebraska/Lincoln and the Washington Area Large-scale Time coincidence Array (WALTA) at University of Washington/Seattle are among several outreach projects siting cosmic-ray detectors at local high schools in cities around North America, to study the origins and interactions of high-energy cosmic rays. In a collaboration between QuarkNet, the outreach program based at Fermilab, CROP, and WALTA, a low-cost data acquisition electronics card has been developed to collect and synchronize the data from each detector site. The cost for each card is under US$500 for parts, functionally replacing much more expensive electronics crates and modules at each high school site. The card has 4 analog discriminator inputs for photo-multiplier tube signals, a 4-channel Time-to-Digital converter for local coincidence and time-over-threshold measurements at 0.75 ns resolution, programmable trigger logic via a CPLD and microcontroller, and a built-in low-cost GPS receiver/antenna module (via external cable) to provide event trigger time stamps at better than 100 ns accuracy. Temperature sensors and a barometer are also integrated to record environmental data along with the counter data. The card connects to any PC or laptop via a standard RS-232 serial port for data output and control. The microcontroller and CPLD are field programmable and therefore make the card functionality flexible and easy to upgrade., Comment: 4 pages, 4 figures, 1 table. Presented by R. J. Wilkes at "IEEE-NSS 2003", Paper N8-1, Portland, OR, November 2003. Submitted to Trans. IEEE

Published
2003
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31. LabView Interface for School-Network DAQ Card

Author

Berns, Hans, Burnett, T. H., Gran, Richard, Wheel, Graham, Wilkes, R. Jeffrey, Claes, Dan, Kite, Jared, and Snow, Gregory

Subjects
Physics - Instrumentation and Detectors, Physics - Data Analysis, Statistics and Probability
Abstract

A low-cost DAQ card has been developed for school-network cosmic ray detector projects, providing digitized data from photomultiplier tubes via a standard serial interface. To facilitate analysis of these data and to provide students with a starting point for custom readout systems, a model interface has been developed using the National Instruments LabVIEW(R) system. This user-friendly interface allows one to initialize the trigger coincidence conditions for data-taking runs and to monitor incoming or pre-recorded data sets with updating singles- and coincidence-rate plots and other user-selectable histograms., Comment: 4 pages, 6 figures. Presented as Paper NS26-119 at IEEE-NSS 2003, Portland, OR, by R. J. Wilkes

Published
2003

32. Gamma Ray Large Area Space Telescope (GLAST) Balloon Flight Data Handling Overview

Author

Burnett, T. H., Chekhtman, A., Silva, E. do Couto e, Dubois, R., Flath, D., Gable, I., Grove, J. E., Hartman, R., Kamae, T., Kavelaars, A., Kelly, H., Kotani, T., Kuss, M., Lauben, D., Lindner, T., Lumb, N., Mizuno, T., Moiseev, A., Ozaki, M., Rochester, L. S., Schaefer, R., Spandre, G., Thompson, D. J., Usher, T., and Young, K.

Subjects
Astrophysics
Abstract

The GLAST Balloon Flight Engineering Model (BFEM) represents one of 16 towers that constitute the Large Area Telescope (LAT), a high-energy (>20 MeV) gamma-ray pair-production telescope being built by an international partnership of astrophysicists and particle physicists for a satellite launch in 2006. The prototype tower consists of a Pb/Si pair-conversion tracker (TKR), a CsI hodoscopic calorimeter (CAL), an anti-coincidence detector (ACD) and an autonomous data acquisition system (DAQ). The self-triggering capabilities and performance of the detector elements have been previously characterized using positron, photon and hadron beams. External target scintillators were placed above the instrument to act as sources of hadronic showers. This paper provides a comprehensive description of the BFEM data-reduction process, from receipt of the flight data from telemetry through event reconstruction and background rejection cuts. The goals of the ground analysis presented here are to verify the functioning of the instrument and to validate the reconstruction software and the background-rejection scheme., Comment: 5 pages, 4 figures, to be published in IEEE Transacations on Nuclear Science, August 2002

Published
2002
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33. Incremental Fermi Large Area Telescope Fourth Source Catalog

Author

Abdollahi, S., primary, Acero, F., additional, Baldini, L., additional, Ballet, J., additional, Bastieri, D., additional, Bellazzini, R., additional, Berenji, B., additional, Berretta, A., additional, Bissaldi, E., additional, Blandford, R. D., additional, Bloom, E., additional, Bonino, R., additional, Brill, A., additional, Britto, R. J., additional, Bruel, P., additional, Burnett, T. H., additional, Buson, S., additional, Cameron, R. A., additional, Caputo, R., additional, Caraveo, P. A., additional, Castro, D., additional, Chaty, S., additional, Cheung, C. C., additional, Chiaro, G., additional, Cibrario, N., additional, Ciprini, S., additional, Coronado-Blázquez, J., additional, Crnogorcevic, M., additional, Cutini, S., additional, D’Ammando, F., additional, De Gaetano, S., additional, Digel, S. W., additional, Di Lalla, N., additional, Dirirsa, F., additional, Di Venere, L., additional, Domínguez, A., additional, Fallah Ramazani, V., additional, Fegan, S. J., additional, Ferrara, E. C., additional, Fiori, A., additional, Fleischhack, H., additional, Franckowiak, A., additional, Fukazawa, Y., additional, Funk, S., additional, Fusco, P., additional, Galanti, G., additional, Gammaldi, V., additional, Gargano, F., additional, Garrappa, S., additional, Gasparrini, D., additional, Giacchino, F., additional, Giglietto, N., additional, Giordano, F., additional, Giroletti, M., additional, Glanzman, T., additional, Green, D., additional, Grenier, I. A., additional, Grondin, M.-H., additional, Guillemot, L., additional, Guiriec, S., additional, Gustafsson, M., additional, Harding, A. K., additional, Hays, E., additional, Hewitt, J. W., additional, Horan, D., additional, Hou, X., additional, Jóhannesson, G., additional, Karwin, C., additional, Kayanoki, T., additional, Kerr, M., additional, Kuss, M., additional, Landriu, D., additional, Larsson, S., additional, Latronico, L., additional, Lemoine-Goumard, M., additional, Li, J., additional, Liodakis, I., additional, Longo, F., additional, Loparco, F., additional, Lott, B., additional, Lubrano, P., additional, Maldera, S., additional, Malyshev, D., additional, Manfreda, A., additional, Martí-Devesa, G., additional, Mazziotta, M. N., additional, Mereu, I., additional, Meyer, M., additional, Michelson, P. F., additional, Mirabal, N., additional, Mitthumsiri, W., additional, Mizuno, T., additional, Moiseev, A. A., additional, Monzani, M. E., additional, Morselli, A., additional, Moskalenko, I. V., additional, Negro, M., additional, Nuss, E., additional, Omodei, N., additional, Orienti, M., additional, Orlando, E., additional, Paneque, D., additional, Pei, Z., additional, Perkins, J. S., additional, Persic, M., additional, Pesce-Rollins, M., additional, Petrosian, V., additional, Pillera, R., additional, Poon, H., additional, Porter, T. A., additional, Principe, G., additional, Rainò, S., additional, Rando, R., additional, Rani, B., additional, Razzano, M., additional, Razzaque, S., additional, Reimer, A., additional, Reimer, O., additional, Reposeur, T., additional, Sánchez-Conde, M., additional, Saz Parkinson, P. M., additional, Scotton, L., additional, Serini, D., additional, Sgrò, C., additional, Siskind, E. J., additional, Smith, D. A., additional, Spandre, G., additional, Spinelli, P., additional, Sueoka, K., additional, Suson, D. J., additional, Tajima, H., additional, Tak, D., additional, Thayer, J. B., additional, Thompson, D. J., additional, Torres, D. F., additional, Troja, E., additional, Valverde, J., additional, Wood, K., additional, and Zaharijas, G., additional

Published
2022
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34. Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT

Author

Abdo, A. A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Çelik, Ö., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cognard, I., Cohen-Tanugi, J., Cominsky, L. R., Conrad, J., Cutini, S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Espinoza, C., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Fortin, P., Frailis, M., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giavitto, G., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M.-H., Grove, J. E., Guillemot, L., Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hughes, R. E., Jackson, M. S., Jóhannesson, G., Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Katsuta, J., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M. L., Kramer, M., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Lyne, A. G., Madejski, G. M., Makeev, A., Mazziotta, M. N., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nolan, P. L, Norris, J. P., Noutsos, A., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Parkinson, P. M. Saz, Scargle, J. D., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Stappers, B. W., Stecker, F. W., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Thayer, J. B., Thayer, J. G., Theureau, G., Thompson, D. J., Tibaldo, L., Tibolla, O., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Vasileiou, V., Venter, C., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, S., Yamazaki, R., Ylinen, T., and Ziegler, M.

Published
2010
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35. A Population of Gamma-Ray Millisecond Pulsars Seen with the Fermi Large Area Telescope

Author

Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Bignami, G. F., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Camilo, F., Caraveo, P. A., Carlson, P., Casandjian, J. M., Cecchi, C., Çelik, Ö., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cognard, I., Cohen-Tanugi, J., Cominsky, L. R., Conrad, J., Corbet, R., Cutini, S., Dermer, C. D., Desvignes, G., de Angelis, A., de Luca, A., de Palma, F., Digel, S. W., Dormody, M., Silva, E. do Couto e, Drell, P. S., Dubois, R., Dumora, D., Edmonds, Y., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Frailis, M., Freire, P. C. C., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M. H., Grove, J. E., Guillemot, L., Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hobbs, G., Hughes, R. E., Jóhannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Johnston, S., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M. L., Kramer, M., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Manchester, R. N., Marelli, M., Mazziotta, M. N., McConville, W., McEnery, J. E., McLaughlin, M. A., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Ransom, S. M., Ray, P. S., Razzano, M., Rea, N., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F. W., Sanchez, D., Sander, A., Parkinson, P. M. Saz, Scargle, J. D., Schalk, T. L., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Stappers, B. W., Starck, J. L., Striani, E., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Theureau, G., Thompson, D. J., Thorsett, S. E., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Van Etten, A., Vasileiou, V., Venter, C., Vilchez, N., Vitale, V., Waite, A. P., Wallace, E., Wang, P., Watters, K., Webb, N., Weltevrede, P., Winer, B. L., Wood, K. S., Ylinen, T., and Ziegler, M.

Published
2009
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36. Detection of 16 Gamma-Ray Pulsars through Blind Frequency Searches Using the Fermi LAT

Author

Abdo, A. A., Ackermann, M., Ajello, M., Anderson, B., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Bignami, G. F., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Çelik, Ö., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., Dermer, C. D., de Angelis, A., de Luca, A., de Palma, F., Digel, S. W., Dormody, M., Silva, E. do Couto e, Drell, P. S., Dubois, R., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giommi, P., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M.-H., Grove, J. E., Guillemot, L., Guiriec, S., Gwon, C., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hughes, R. E., Jóhannesson, G., Johnson, R. P., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M. L., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Marelli, M., Mazziotta, M. N., McConville, W., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Pierbattista, M., Piron, F., Porter, T. A., Primack, J. R., Rainò, S., Rando, R., Ray, P. S., Razzano, M., Rea, N., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Parkinson, P. M. Saz, Scargle, J. D., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Starck, J.-L., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. G., Thompson, D. J., Tibaldo, L., Tibolla, O., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Van Etten, A., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Watters, K., Winer, B. L., Wolff, M. T., Wood, K. S., Ylinen, T., and Ziegler, M.

Published
2009
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37. Detection of High-Energy Gamma-Ray Emission from the Globular Cluster 47 Tucanae with Fermi

Author

Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Çelik, Ö., Charles, E., Chaty, S., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Cutini, S., Dermer, C. D., de Palma, F., Digel, S. W., Dormody, M., Silva, E. do Couto e, Drell, P. S., Dubois, R., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Frailis, M., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Horan, D., Hughes, R. E., Jóhannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kawai, N., Kerr, M., Knödlseder, J., Kuehn, F., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., McConville, W., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pierbattista, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Rea, N., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Parkinson, P. M. Saz, Sgrò, C., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Starck, J.-L., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Vasileiou, V., Vilchez, N., Vitale, V., Wang, P., Webb, N., Winer, B. L., Wood, K. S., Ylinen, T., and Ziegler, M.

Published
2009
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38. The Fermi Gamma-Ray Space Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1

Author

Abdo, A. A., Ackermann, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bogaert, G., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carlson, P., Casandjian, J. M., Cecchi, C., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cominsky, L. R., Conrad, J., Cutini, S., Davis, D. S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Dormody, M., Silva, E. do Couto e, Drell, P. S., Dubois, R., Dumora, D., Edmonds, Y., Farnier, C., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M.-H., Grove, J. E., Guillemot, L., Guiriec, S., Harding, A. K., Hartman, R. C., Hays, E., Hughes, R. E., Jóhannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Kamae, T., Kanai, Y., Kanbach, G., Katagiri, H., Kawai, N., Kerr, M., Kishishita, T., Kiziltan, B., Knödlseder, J., Kocian, M. L., Komin, N., Kuehn, F., Kuss, M., Latronico, L., Lemoine-Goumard, M., Longo, F., Lonjou, V., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Marelli, M., Mazziotta, M. N., McEnery, J. E., McGlynn, S., Meurer, C., Michelson, P. F., Mineo, T., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nolan, P. L., Nuss, E., Ohno, M., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piano, G., Pieri, L., Piron, F., Porter, T. A., Rainò, S., Rando, R., Ray, P. S., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Parkinson, P. M. Saz, Schalk, T. L., Sellerholm, A., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Starck, J.-L., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Thorsett, S. E., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Usher, T. L., Van Etten, A., Vilchez, N., Vitale, V., Wang, P., Watters, K., Winer, B. L., Wood, K. S., Yasuda, H., Ylinen, T., and Ziegler, M.

Published
2008
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41. Fermi Large Area Telescope Fourth Source Catalog

Author

Abdollahi, S., Acero, F., Ackermann, Markus, Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Becerra Gonzalez, J., Bellazzini, R., Berretta, A., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Burnett, T. H., Buson, S., Cameron, R. A., Caputo, R., Caraveo, P. A., Casandjian, J. M., Castro, D., Cavazzuti, E., Charles, E., Chaty, S., Chen, S., Cheung, C. C., Chiaro, G., Ciprini, S., Cohen-Tanugi, J., Cominsky, L. R., Coronado-Blázquez, J., Costantin, D., Cuoco, A., Cutini, S., D’Ammando, F., DeKlotz, M., Torre Luque, P. De La, De Palma, F., Desai, A., Digel, S. W., Lalla, N. Di, Mauro, M. Di, Venere, L. Di, Domínguez, A., Dumora, D., Dirirsa, F. Fana, Fegan, S. J., Ferrara, E. C., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Green, D., Grenier, I. A., Griffin, S., Grondin, M.-H., Grove, J. E., Guiriec, S., Harding, A. K., Hayashi, K., Hays, E., Hewitt, J. W., Horan, D., Jóhannesson, G., Johnson, T. J., Kamae, T., Kerr, M., Kocevski, D., Kovac’evic’, M., Kuss, M., Landriu, D., Larsson, S., Latronico, L., Lemoine-Goumard, M., Li, Jian, Liodakis, I., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Maldera, S., Malyshev, D., Manfreda, A., Marchesini, E. J., Marcotulli, L., Martí-Devesa, G., Martin, P., Massaro, F., Mazziotta, M. N., McEnery, J. E., Mereu, I., Meyer, M., Michelson, P. F., Mirabal, N., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Negro, M., Nuss, E., Ojha, R., Omodei, N., Orienti, M., Orlando, E., Ormes, J. F., Palatiello, M., Paliya, Vaidehi Sharan, Paneque, D., Pei, Z., Peña-Herazo, H., Perkins, J. S., Persic, M., Pesce-Rollins, M., Petrosian, V., Petrov, L., Piron, F., Poon, H., Porter, T. A., Principe, G., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Remy, Q., Reposeur, T., Romani, R. W., Parkinson, P. M. Saz, Schinzel, F. K., Serini, D., Sgrò, C., Siskind, E. J., Smith, D. A., Spandre, G., Spinelli, P., Strong, A. W., Suson, D. J., Tajima, H., Takahashi, M. N., Tak, D., Thayer, J. B., Thompson, D. J., Tibaldo, L., Torres, D. F., Torresi, E., Valverde, J., Klaveren, B. Van, Zyl, P. Van, Wood, K., Yassine, M., and Zaharijas, G.

Abstract

The astrophysical journal / Supplement series Supplement series [...] 247(1), 33 - (2020). doi:10.3847/1538-4365/ab6bcb, We present the fourth Fermi Large Area Telescope catalog (4FGL) of γ-ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest yet in this energy range. Relative to the 3FGL catalog, the 4FGL catalog has twice as much exposure as well as a number of analysis improvements, including an updated model for the Galactic diffuse γ-ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4σ significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall, 358 sources are considered as identified based on angular extent, periodicity, or correlated variability observed at other wavelengths. For 1336 sources, we have not found plausible counterparts at other wavelengths. More than 3130 of the identified or associated sources are active galaxies of the blazar class, and 239 are pulsars., Published by Univ. of Chicago Press11033, Chicago, Ill. [u.a.]

Published
2020
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42. Fermi Large Area Telescope Fourth Source Catalog

Author

Abdollahi, S., primary, Acero, F., additional, Ackermann, M., additional, Ajello, M., additional, Atwood, W. B., additional, Axelsson, M., additional, Baldini, L., additional, Ballet, J., additional, Barbiellini, G., additional, Bastieri, D., additional, Becerra Gonzalez, J., additional, Bellazzini, R., additional, Berretta, A., additional, Bissaldi, E., additional, Blandford, R. D., additional, Bloom, E. D., additional, Bonino, R., additional, Bottacini, E., additional, Brandt, T. J., additional, Bregeon, J., additional, Bruel, P., additional, Buehler, R., additional, Burnett, T. H., additional, Buson, S., additional, Cameron, R. A., additional, Caputo, R., additional, Caraveo, P. A., additional, Casandjian, J. M., additional, Castro, D., additional, Cavazzuti, E., additional, Charles, E., additional, Chaty, S., additional, Chen, S., additional, Cheung, C. C., additional, Chiaro, G., additional, Ciprini, S., additional, Cohen-Tanugi, J., additional, Cominsky, L. R., additional, Coronado-Blázquez, J., additional, Costantin, D., additional, Cuoco, A., additional, Cutini, S., additional, D’Ammando, F., additional, DeKlotz, M., additional, Torre Luque, P. de la, additional, de Palma, F., additional, Desai, A., additional, Digel, S. W., additional, Lalla, N. Di, additional, Mauro, M. Di, additional, Venere, L. Di, additional, Domínguez, A., additional, Dumora, D., additional, Dirirsa, F. Fana, additional, Fegan, S. J., additional, Ferrara, E. C., additional, Franckowiak, A., additional, Fukazawa, Y., additional, Funk, S., additional, Fusco, P., additional, Gargano, F., additional, Gasparrini, D., additional, Giglietto, N., additional, Giommi, P., additional, Giordano, F., additional, Giroletti, M., additional, Glanzman, T., additional, Green, D., additional, Grenier, I. A., additional, Griffin, S., additional, Grondin, M.-H., additional, Grove, J. E., additional, Guiriec, S., additional, Harding, A. K., additional, Hayashi, K., additional, Hays, E., additional, Hewitt, J. W., additional, Horan, D., additional, Jóhannesson, G., additional, Johnson, T. J., additional, Kamae, T., additional, Kerr, M., additional, Kocevski, D., additional, Kovac’evic’, M., additional, Kuss, M., additional, Landriu, D., additional, Larsson, S., additional, Latronico, L., additional, Lemoine-Goumard, M., additional, Li, J., additional, Liodakis, I., additional, Longo, F., additional, Loparco, F., additional, Lott, B., additional, Lovellette, M. N., additional, Lubrano, P., additional, Madejski, G. M., additional, Maldera, S., additional, Malyshev, D., additional, Manfreda, A., additional, Marchesini, E. J., additional, Marcotulli, L., additional, Martí-Devesa, G., additional, Martin, P., additional, Massaro, F., additional, Mazziotta, M. N., additional, McEnery, J. E., additional, Mereu, I., additional, Meyer, M., additional, Michelson, P. F., additional, Mirabal, N., additional, Mizuno, T., additional, Monzani, M. E., additional, Morselli, A., additional, Moskalenko, I. V., additional, Negro, M., additional, Nuss, E., additional, Ojha, R., additional, Omodei, N., additional, Orienti, M., additional, Orlando, E., additional, Ormes, J. F., additional, Palatiello, M., additional, Paliya, V. S., additional, Paneque, D., additional, Pei, Z., additional, Peña-Herazo, H., additional, Perkins, J. S., additional, Persic, M., additional, Pesce-Rollins, M., additional, Petrosian, V., additional, Petrov, L., additional, Piron, F., additional, Poon, H., additional, Porter, T. A., additional, Principe, G., additional, Rainò, S., additional, Rando, R., additional, Razzano, M., additional, Razzaque, S., additional, Reimer, A., additional, Reimer, O., additional, Remy, Q., additional, Reposeur, T., additional, Romani, R. W., additional, Parkinson, P. M. Saz, additional, Schinzel, F. K., additional, Serini, D., additional, Sgrò, C., additional, Siskind, E. J., additional, Smith, D. A., additional, Spandre, G., additional, Spinelli, P., additional, Strong, A. W., additional, Suson, D. J., additional, Tajima, H., additional, Takahashi, M. N., additional, Tak, D., additional, Thayer, J. B., additional, Thompson, D. J., additional, Tibaldo, L., additional, Torres, D. F., additional, Torresi, E., additional, Valverde, J., additional, Klaveren, B. Van, additional, Zyl, P. van, additional, Wood, K., additional, Yassine, M., additional, and Zaharijas, G., additional

Published
2020
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43. Search for Dark Matter Satellites Using the Fermi-Lat

Author

Ackermann, M, Albert, A, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Blandford, R. D, Bloom, E. D, Bonamente, E, Borgland, A. W, Bottacini, E, Brandt, T. J, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Burnett, T. H, Caliandro, G. A, Cameron, R. A, Caraveo, P. A, Casandjian, J. M, McEnery, J. E, and Troja, E

Subjects
Astrophysics
Abstract

Numerical simulations based on the ACDM model of cosmology predict a large number of as yet unobserved Galactic dark matter satellites. We report the results of a Large Area Telescope (LAT) search for these satellites via the gamma-ray emission expected from the annihilation of weakly interacting massive particle (WIMP) dark matter. Some dark matter satellites are expected to have hard gamma-ray spectra, finite angular extents, and a lack of counterparts at other wavelengths. We sought to identify LAT sources with these characteristics, focusing on gamma-ray spectra consistent with WIMP annihilation through the bb(sup raised bar) channel. We found no viable dark matter satellite candidates using one year of data, and we present a framework for interpreting this result in the context of numerical simulations to constrain the velocity-averaged annihilation cross section for a conventional 100 Ge V WIMP annihilating through the bb(sup raised bar) channel.

Published
2012

44. Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni

Author

Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bouvier, A., Brandt, T. J., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Buehler, R., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cecchi, C., Celik, O., Charles, E., Chaty, S., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Corbel, S., Corbet, R., DeCesar, M. E., den Hartog, P. R., Dermer, C. D., de Palma, F., Digel, S. W., Donato, D., do Couto e Silva, E., Drell, P. S., Dubois, R., Dubus, G., Dumora, D., Favuzzi, C., Fegan, S. J., Ferrara, E. C, Fortin, P., Frailis, M., Fuhrmann, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gaspamini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M.-H., Grove, J. E., Guiriec, S., Hadasch, D., Harding, A. K., Hayashida, M., Hays, E., Healey, S. E., Hill, A. B., Horan, D., Hughes, R. E., Itoh, R., Jean, P., Jóhannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kerr, M., Knödlseder, J., Koerding, E., Kuss, M., Lande, J., Latronico, L., Lee, S.-H., Lemoine-Goumard, M., Garde, Llena M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., McConville, W., McEnery, J. E., Mehault, J., Michelson, P. F., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Naumann-Godo, M., Nestoras, I., Nolan, P. L., Norris, J. P., Nuss, E., Ohno, M., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A, Raino, S., Rando, R., Ray, P. S., Razzano, M., Razzaque, S., Rea, N., Reimer, A., Reimer, O., Reposeur, T., Ripken, J., Ritz, S., Romani, R. W., Roth, M., Sadrozinski, H. F.-W., Sander, A., Saz Parkinson, P. M., Scargle, J. D., Schinzel, F. K., Sgrò, C., Shaw, M. S., Siskind, E. J., Smith, D. A., Smith, P. D., Sokolovsky, K. V., Spandre, G., Spinelli, P., Stawarz, L., Strickman, M. S., Suson, D. J., Takahashi, H., Takahashi, T., Tanaka, T., Tanaka, Y., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L, Vandenbroucke, J., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wallace, E., Wang, P., Winer, B. L, Wolff, M. T., Wood, K. S., Yang, Z., Ylinen, T., Ziegler, M., Maehara, H., Nishiyama, K., Kabashima, F., Bach, U., Bower, G. C., Falcone, A., Forster, J. R., Henden, A., Kawabata, K. S., Koubsky, P., Mukai, K., Nelson, T., Oates, S. R., Sakimoto, K., Sasada, M., Shenavrin, V. I., Shore, S. N., Skinner, G. K., Sokoloski, J., Stroh, M., Tatarnikov, A. M., Uemura, M., Wahlgren, G. M., and Yamanaka, M.

Published
2010
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45. Fermi Gamma-Ray Imaging of a Radio Galaxy

Author

Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L, Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Çelik, Ö., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Colafrancesco, S., Cominsky, L. R., Conrad, J., Costamante, L, Cutini, S., Davis, D. S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Famier, C., Favuzzi, C., Fegan, S. J., Finke, J., Focke, W. B., Fortin, P., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Georganopoulos, M., Germani, S., Giebels, B., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L, Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hughes, R. E., Jackson, M. S., Johannesson, G., Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M. L., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Mazziotta, M. N., McConville, W., McEnery, J. E., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sambruna, R., Sanchez, D., Sander, A., Saz Parkinson, P. M., Scargle, J. D., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Starck, J.-L., Stawarz, Ł., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wallace, E., Wang, P., Winer, B. L., Wood, K. S., Ylinen, T., Ziegler, M., Hardcastle, M. J., and Kazanas, D.

Published
2010
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46. A change in the optical polarization associated with a γ-ray flare in the blazar 3C 279

Author

Abdo, A. A., Ackermann, M., Ajello, M., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bock, D. C.-J., Bogart, J. R., Bonamente, E., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Çelik, Ö., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Collmar, W., Cominsky, L. R., Conrad, J., Corbel, S., Corbet, R., Costamante, L., Cutini, S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Fortin, P., Frailis, M., Fuhrmann, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Horan, D., Hughes, R. E., Iafrate, G., Itoh, R., Jackson, M. S., Jóhannesson, G., Johnson, A. S., Johnson, W. N., Kadler, M., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M. L., Kuss, M., Lande, J., Larsson, S., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Macquart, J., Madejski, G. M., Makeev, A., Max-Moerbeck, W., Mazziotta, M. N., McConville, W., McEnery, J. E., McGlynn, S., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nestoras, I., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Panetta, J. H., Parent, D., Pavlidou, V., Pearson, T. J., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Readhead, A., Reimer, A., Reimer, O., Reposeur, T., Reyes, L. C., Richards, J. L., Rochester, L. S., Rodriguez, A. Y., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Saz Parkinson, P. M., Scargle, J. D., Sgrò, C., Shaw, M. S., Shrader, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Stawarz, L., Stevenson, M., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Taylor, G. B., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Wehrle, A. E., Winer, B. L., Wood, K. S., Ylinen, T., Zensus, J. A., Ziegler, M., Uemura, M., Ikejiri, Y., Kawabata, K. S., Kino, M., Sakimoto, K., Sasada, M., Sato, S., Yamanaka, M., Villata, M., Raiteri, C. M., Agudo, I., Aller, H. D., Aller, M. F., Angelakis, E., Arkharov, A. A., Bach, U., Benítez, E., Berdyugin, A., Blinov, D. A., Boettcher, M., Buemi, C. S., Chen, W. P., Dolci, M., Dultzin, D., Efimova, N. V., Gurwell, M. A., Gusbar, C., Gómez, J. L., Heidt, J., Hiriart, D., Hovatta, T., Jorstad, S. G., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O. M., Lahteenmaki, A., Larionov, V. M., Larionova, E. G., Leto, P., Lin, H. C., Lindfors, E., Marscher, A. P., McHardy, I. M., Melnichuk, D. A., Mommert, M., Nilsson, K., Di Paola, A., Reinthal, R., Richter, G. M., Roca-Sogorb, M., Roustazadeh, P., Sigua, L. A., Takalo, L. O., Tornikoski, M., Trigilio, C., Troitsky, I. S., Umana, G., Villforth, C., Grainge, K., Moderski, R., Nalewajko, K., and Sikora, M.

Published
2010
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47. Modulated High-Energy Gamma-Ray Emission from the Microquasar Cygnus X-3

Author

Abdo, A. A., Ackermann, M., Ajello, M., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Çelik, Ö., Chaty, S., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cominsky, L R., Conrad, J., Corbel, S., Corbet, R., Dermer, C. D., de Palma, F., Digel, S. W., do Couto e Silva, E., Drell, P. S., Dubois, R., Dubus, G., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Focke, W. B., Fortin, P., Frailis, M., Fusco, P., Gargano, F., Gehrels, N., Germani, S., Giavitto, G., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M.-H., Grove, J. E., Guillemot, L, Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hill, A. B., Hjalmarsdotter, L., Horan, D., Hughes, R. E., Jackson, M. S., Jóhannesson, G., Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M. L., Koerding, E., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Marchand, L., Marelli, M., Max-Moerbeck, W., Mazziotta, M. N., McColl, N., McEnery, J. E., Meurer, C., Michelson, P. F., Migliari, S., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nolan, P. L, Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Ong, R. A., Ormes, J. F., Paneque, D., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Pooley, G., Porter, T. A., Pottschmidt, K., Rainò, S., Rando, R., Ray, P. S., Razzano, M., Rea, N., Readhead, A., Reimer, A., Reimer, O., Richards, J. L., Rochester, L S., Rodriguez, J., Rodriguez, A. Y., Romani, R. W., Ryde, F., Sadrozinski, H. F.-W., Sander, A., Saz Parkinson, P. M., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spinelli, P., Starck, J.-L, Stevenson, M., Strickman, M. S., Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. B., Thompson, D. J., Tibaldo, L, Tomsick, J. A., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L, Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Wilms, J., Winer, B. L., Wood, K. S., Ylinen, T., and Ziegler, M.

Published
2009
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48. A limit on the variation of the speed of light arising from quantum gravity effects

Author

Abdo, A. A., Ackermann, M., Ajello, M., Asano, K., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Bhat, P. N., Bissaldi, E., Bloom, E. D., Bonamente, E., Bonnell, J., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Briggs, M. S., Brigida, M., Bruel, P., Burgess, J. M., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Çelik, Ö., Chaplin, V., Charles, E., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cominsky, L. R., Connaughton, V., Conrad, J., Cutini, S., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Dingus, B. L., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Farnier, C., Favuzzi, C., Fegan, S. J., Finke, J., Fishman, G., Focke, W. B., Foschini, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Gibby, L., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Granot, J., Greiner, J., Grenier, I. A., Grondin, M.-H., Grove, J. E., Grupe, D., Guillemot, L., Guiriec, S., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hoversten, E. A., Hughes, R. E., Jóhannesson, G., Johnson, A. S., Johnson, R. P., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Kippen, R. M., Knödlseder, J., Kocevski, D., Kouveliotou, C., Kuehn, F., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Mazziotta, M. N., McBreen, S., McEnery, J. E., McGlynn, S., Mészáros, P., Meurer, C., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nolan, P. L., Norris, J. P., Nuss, E., Ohno, M., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paciesas, W. S., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Petrosian, V., Piron, F., Porter, T. A., Preece, R., Rainò, S., Ramirez-Ruiz, E., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Saz Parkinson, P. M., Scargle, J. D., Schalk, T. L., Sgrò, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Stamatikos, M., Stecker, F. W., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Toma, K., Torres, D. F., Tosti, G., Troja, E., Uchiyama, Y., Uehara, T., Usher, T. L., van der Horst, A. J., Vasileiou, V., Vilchez, N., Vitale, V., von Kienlin, A., Waite, A. P., Wang, P., Wilson-Hodge, C., Winer, B. L., Wood, K. S., Wu, X. F., Yamazaki, R., Ylinen, T., and Ziegler, M.

Published
2009
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49. Fermi Observations of High-Energy Gamma-Ray Emission from GRB 080916C

Author

Abdo, A. A., Ackermann, M., Arimoto, M., Asano, K., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Band, D. L., Barbiellini, G., Baring, M. G., Bastieri, D., Battelino, M., Baughman, B. M., Bechtol, K., Bellardi, F., Bellazzini, R., Berenji, B., Bhat, P. N., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bogaert, G., Bogart, J. R., Bonamente, E., Bonnell, J., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Briggs, M. S., Brigida, M., Bruel, P., Burnett, T. H., Burrows, D., Busetto, G., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Ceccanti, M., Cecchi, C., Celotti, A., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Cominsky, L. R., Connaughton, V., Conrad, J., Costamante, L., Cutini, S., DeKlotz, M., Dermer, C. D., de Angelis, A., de Palma, F., Digel, S. W., Dingus, B. L., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Edmonds, Y., Evans, P. A., Fabiani, D., Farnier, C., Favuzzi, C., Finke, J., Fishman, G., Focke, W. B., Frailis, M., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giommi, P., Giordano, F., Glanzman, T., Godfrey, G., Goldstein, A., Granot, J., Greiner, J., Grenier, I. A., Grondin, M.-H., Grove, J. E., Guillemot, L., Guiriec, S., Haller, G., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Morata, Hernando J. A., Hoover, A., Hughes, R. E., Jóhannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Kavelaars, A., Kawai, N., Kelly, H., Kennea, J., Kerr, M., Kippen, R. M., Knödlseder, J., Kocevski, D., Kocian, M. L., Komin, N., Kouveliotou, C., Kuehn, F., Kuss, M., Lande, J., Landriu, D., Larsson, S., Latronico, L., Lavalley, C., Lee, B., Lee, S.-H., Lemoine-Goumard, M., Lichti, G. G., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Makeev, A., Marangelli, B., Mazziotta, M. N., McBreen, S., McEnery, J. E., McGlynn, S., Meegan, C., Mészáros, P., Meurer, C., Michelson, P. F., Minuti, M., Mirizzi, N., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nelson, D., Nolan, P. L., Norris, J. P., Nuss, E., Ohno, M., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paciesas, W. S., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Perri, M., Pesce-Rollins, M., Petrosian, V., Pinchera, M., Piron, F., Porter, T. A., Preece, R., Rainò, S., Ramirez-Ruiz, E., Rando, R., Rapposelli, E., Razzano, M., Razzaque, S., Rea, N., Reimer, A., Reimer, O., Reposeur, T., Reyes, L. C., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Roth, M., Ryde, F., Sadrozinski, H. F.-W., Sanchez, D., Sander, A., Parkinson, Saz P. M., Scargle, J. D., Schalk, T. L., Segal, K. N., Sgrò, C., Shimokawabe, T., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Stamatikos, M., Starck, J.-L, Stecker, F. W., Steinle, H., Stephens, T. E., Strickman, M. S., Suson, D. J., Tagliaferri, G., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Tenze, A., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Turri, M., Tuvi, S., Usher, T. L., van der Horst, A. J., Vigiani, L., Vilchez, N., Vitale, V., von Kienlin, A., Waite, A. P., Williams, D. A., Wilson-Hodge, C., Winer, B. L., Wood, K. S., Wu, X. F., Yamazaki, R., Ylinen, T., and Ziegler, M.

Published
2009

50. The search for cosmic strangelets with the supersonic concorde and with JACEE's circumpolar balloon flight in Antarctica

Author

Takahashi, Yoshiyuki, Capdevielle, J. N., Kawahara, A., Takao, Y., Sugitate, T., Miyamura, O., Ogata, T., Dong, B. L., Takahashi, Y., Miyamura, O., Asakimori, K., Burnett, T. H., Cherry, M. L., Christl, M. J., Dake, S., Derrickson, J. H., Fountain, W. F., Fuki, M., Gregory, J. C., Holynski, R., Iyono, A., Jones, W. V., Kawahara, A., Kobayashi, M., Lord, J., Moon, K. H., Oda, H., Ogata, T., Olson, E. D., Parnell, T. A., Strausz, S. C., Sugitate, T., Takahashi, Y., Takao, Y., Tominaga, T., Wefel, J. P., Wilczynska, B., Wilczynski, H., Wilkes, R. J., Wolter, W., Yokomi, H., and Zager, E.

Published
1996
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