12 results on '"Boggs, S.E."'
Search Results
2. Cosmic antihelium-3 nuclei sensitivity of the GAPS experiment
- Author
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Saffold, N., Aramaki, T., Bird, R., Boezio, M., Boggs, S.E., Bonvicini, V., Campana, D., Craig, W.W., von Doetinchem, P., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C.J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mognet, S.I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R.A., Osteria, G., Perez, K., Pope, I., Quinn, S., Re, V., Reed, M., Riceputi, E., Roach, B., Rogers, F., Ryan, J.L., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.
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- 2021
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3. Front-end ASIC for germanium strip detectors
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Wulf, E.A., Hou, W., De Geronimo, G., Roberts, J.M., Boggs, S.E., and Phlips, B.F.
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- 2020
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4. Construction, characterization, and environmental testing of a Laue lens prototype using Fe and Al crystals
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Wade, C., Barrière, N.M., Tomsick, J.A., Hanlon, L., Boggs, S.E., Lowell, A., von Ballmoos, P., and Massahi, S.
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- 2018
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5. Antideuteron sensitivity for the GAPS experiment
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Aramaki, T., Hailey, C.J., Boggs, S.E., von Doetinchem, P., Fuke, H., Mognet, S.I., Ong, R.A., Perez, K., and Zweerink, J.
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- 2016
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6. The upcoming balloon campaign of the Compton Spectrometer and Imager (COSI)
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Chiu, J.-L., Boggs, S.E., Chang, H.-K., Tomsick, J.A., Zoglauer, A., Amman, M., Chang, Y.-H., Chou, Y., Jean, P., Kierans, C., Lin, C.-H., Lowell, A., Shang, J.-R., Tseng, C.-H., von Ballmoos, P., and Yang, C.-Y.
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- 2015
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7. An ultraluminous X-ray source powered by an accreting neutron star
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Bachetti, M., Harrison, F.A., Walton, D.J., Grefenstette, B.W., Chakrabarty, D., Furst, F., Barret, D., Beloborodov, A., Boggs, S.E., Christensen, F.E., Craig, W.W., Fabian, A.C., Hailey, C.J., Hornschemeier, A., Kaspi, V., Kulkarni, S.R., Maccarone, T., Miller, J.M., Rana, V., Stern, D., Tendulkar, S.P., Tomsick, J., Webb, N.A., and Zhang, W.W.
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Galaxies -- Observations ,Galactic center -- Observations ,Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
The majority of ultraluminous X-ray sources are point sources that are spatially offset from the nuclei of nearby galaxies and whose X-ray luminosities exceed the theoretical maximum for spherical infall (the Eddington limit) onto stellar-mass black holes (1,2). Their X-ray luminosities in the 0.5-10 kiloelectronvolt energy band range from [10.sup.39] to [10.sup.41] ergs per second (3). Because higher masses imply less extreme ratios of the luminosity to the isotropic Eddington limit, theoretical models have focused on black hole rather than neutron star systems (1,2). The most challenging sources to explain are those at the luminous end of the range (more than [10.sub.40] ergs per second), which require black hole masses of 50-100 times the solar value or significant departures from the standard thin disk accretion that powers bright Galactic X-ray binaries, or both. Here we report broadband X-ray observations of the nuclear region of the galaxy M82 that reveal pulsations with an average period of 1.37 seconds and a 2.5-day sinusoidal modulation. The pulsations result from the rotation of a magnetized neutron star, and the modulation arises from its binary orbit. The pulsed flux alone corresponds to an X-ray luminosity in the 3-30 kiloelectronvolt range of 4.9 x [10.sup.39] ergs per second. The pulsating source is spatially coincident with a variable source (4) that can reach an X-ray luminosity in the 0.3-10 kiloelectronvolt range of 1.8 x [10.sup.40] ergs per second (1). This association implies a luminosity of about 100 times the Eddington limit for a 1.4-solar-mass object, or more than ten times brighter than any known accreting pulsar. This implies that neutron stars may not be rare in the ultraluminous X-ray population, and it challenges physical models for the accretion of matter onto magnetized compact objects., The brightest accretion-powered X-ray pulsars, A0538-66 (5), SMCX-1 (6) and GRO J1744-28 (7), are variable, with reported X-ray luminosities up to [L.sub.X] (2-20 keV) ≅ [10.sup.39] erg [s.sup.-1], which are [...]
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- 2014
8. The Nature of the Torus in the Heavily Obscured AGN Markarian 3: an X-Ray Study
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Guainazzi, M, Risaliti, G, Awaki, H, Arevalo, P, Bauer, F. E, Bianchi, S, Boggs, S.E, Brandt, W. N, Brightman, M, Christensen, F. E, Craig, W. W, Forster, K, Hailey, C. J, Harrison, F, Koss, M, Longinotti, A, Markwardt, C. B, Marinucci, A, Matt, G, Reynolds, C. S, Ricci, C, Stern, D, Svoboda, J, Walton, D, and Zhang, W
- Subjects
Astrophysics - Abstract
In this paper, we report the results of an X-ray monitoring campaign on the heavily obscured Seyfert galaxy, Markarian 3, carried out between the fall of 2014 and the spring of 2015 with NuSTAR, Suzaku and XMMNewton. The hard X-ray spectrum of Markarian 3 is variable on all the time-scales probed by our campaign, down to a few days. The observed continuum variability is due to an intrinsically variable primary continuum seen in transmission through a large, but still Compton-thin column density (N(sub H) approx. 0.8-1.1 x 10(exp 24)/sq cm). If arranged in a spherical-toroidal geometry, the Compton scattering matter has an opening angle approx. 66deg, and is seen at a grazing angle through its upper rim (inclination angle approx. 70deg). We report a possible occultation event during the 2014 campaign. If the torus is constituted by a system of clouds sharing the same column density, this event allows us to constrain their number (17 +/- 5) and individual column density, [approx. (4.9 +/- 1.5) x 10(exp 22)/ sq cm]. The comparison of IR and X-ray spectroscopic results with state-of-the art torus models suggests that at least two-thirds of the X-ray obscuring gas volume might be located within the dust sublimation radius. We report also the discovery of an ionized absorber, characterized by variable resonant absorption lines due to He- and H-like iron. This discovery lends support to the idea that moderate column density absorbers could be due to clouds evaporated at the outer surface of the torus, possibly accelerated by the radiation pressure due to the central AGN emission leaking through the patchy absorber.
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- 2016
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9. Cosmic-ray antinuclei as messengers of new physics: status and outlook for the new decade
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Doetinchem, P. von, primary, Perez, K., additional, Aramaki, T., additional, Baker, S., additional, Barwick, S., additional, Bird, R., additional, Boezio, M., additional, Boggs, S.E., additional, Cui, M., additional, Datta, A., additional, Donato, F., additional, Evoli, C., additional, Fabris, L., additional, Fabbietti, L., additional, Bueno, E. Ferronato, additional, Fornengo, N., additional, Fuke, H., additional, Gerrity, C., additional, Coral, D. Gomez, additional, Hailey, C., additional, Hooper, D., additional, Kachelriess, M., additional, Korsmeier, M., additional, Kozai, M., additional, Lea, R., additional, Li, N., additional, Lowell, A., additional, Manghisoni, M., additional, Moskalenko, I.V., additional, Munini, R., additional, Naskret, M., additional, Nelson, T., additional, Ng, K.C.Y., additional, Nozzoli, F., additional, Oliva, A., additional, Ong, R.A., additional, Osteria, G., additional, Pierog, T., additional, Poulin, V., additional, Profumo, S., additional, Pöschl, T., additional, Quinn, S., additional, Re, V., additional, Rogers, F., additional, Ryan, J., additional, Saffold, N., additional, Sakai, K., additional, Salati, P., additional, Schael, S., additional, Serksnyte, L., additional, Shukla, A., additional, Stoessl, A., additional, Tjemsland, J., additional, Vannuccini, E., additional, Vecchi, M., additional, Winkler, M.W., additional, Wright, D., additional, Xiao, M., additional, Xu, W., additional, Yoshida, T., additional, Zampa, G., additional, and Zuccon, P., additional
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- 2020
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10. NuSTAR reveals the extreme properties of the super-Eddington accreting supermassive black hole in PG 1247+267
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Duncan Farrah, Franz E. Bauer, M. Cappi, W. N. Brandt, W. W. Zhang, Giorgio Lanzuisi, M. Dadina, Enrico Piconcelli, Fausto Vagnetti, Andrea Comastri, C. J. Hailey, William W. Craig, S. E. Boggs, Fiona A. Harrison, Giorgio Matt, Claudio Ricci, A. C. Fabian, Dom Walton, Andrea Marinucci, F. E. Christensen, Michele Perna, S. Puccetti, David R. Ballantyne, Alberto Masini, D. Stern, C. Vignali, Cristian Saez, B. Luo, Marcella Brusa, Lanzuisi, G., Perna, M., Comastri, A., Cappi, M., Dadina, M., Marinucci, Andrea, Masini, A., Matt, Giorgio, Vagnetti, F., Vignali, C., Ballantyne, D. R., Bauer, F. E., Boggs, S. E., Brandt, W. N., Brusa, M., Christensen, F. E., Craig, W. W., Fabian, A. C., Farrah, D., Hailey, C. J., Harrison, F. A., Luo, B., Piconcelli, E., Puccetti, S., Ricci, C., Saez, C., Stern, D., Walton, D. J., Zhang, W. W., Marinucci, A., Matt, G., Ballantyne, D.R., Bauer, F.E., Boggs, S.E., Brandt, W.N., Christensen, F.E., Craig, W.W., Fabian, A.C., Hailey, C.J., Harrison, F.A., Walton, D.J., and Zhang, W.W.
- Subjects
Accretion ,active [Galaxies] ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Power law ,Relativistic disk ,Quasars: individual: PG 1247+267 ,Accretion, accretion disk ,Settore FIS/05 - Astronomia e Astrofisica ,individual: PG 1247+267 [Quasars] ,Ionization ,0103 physical sciences ,Cutoff ,Emission spectrum ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Galaxies: nuclei ,Physics ,010308 nuclear & particles physics ,Astronomy and Astrophysics ,Quasar ,Plasma ,Galaxies: active ,Astronomy and Astrophysic ,Redshift ,Space and Planetary Science ,nuclei [Galaxies] ,Accretion disks - Abstract
PG1247+267 is one of the most luminous known quasars at z similar to 2 and is a strongly super-Eddington accreting supermassive black hole (SMBH) candidate. We obtained NuSTAR data of this intriguing source in December 2014 with the aim of studying its high-energy emission, leveraging the broad band covered by the new NuSTAR and the archival XMM-Newton data. Several measurements are in agreement with the super-Eddington scenario for PG1247+267: the soft power law (Gamma = 2.3 +/- 0.1); the weak ionized Fe emission line; and a hint of the presence of outflowing ionized gas surrounding the SMBH. The presence of an extreme reflection component is instead at odds with the high accretion rate proposed for this quasar. This can be explained with three different scenarios; all of them are in good agreement with the existing data, but imply very different conclusions: i) a variable primary power law observed in a low state, superimposed on a reflection component echoing a past, higher flux state; ii) a power law continuum obscured by an ionized, Compton thick, partial covering absorber; and iii) a relativistic disk reflector in a lamp-post geometry, with low coronal height and high BH spin. The first model is able to explain the high reflection component in terms of variability. The second does not require any reflection to reproduce the hard emission, while a rather low high-energy cutoff of similar to 100 keV is detected for the first time in such a high redshift source. The third model require a face-on geometry, which may affect the SMBH mass and Eddington ratio measurements. Deeper X-ray broad-band data are required in order to distinguish between these possibilities.
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- 2016
11. The Phoenix galaxy as seen by NuSTAR
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Stephanie M. LaMassa, Matteo Guainazzi, Fiona A. Harrison, Dominic J. Walton, Walter Craig, C. J. Hailey, Michael Koss, S. E. Boggs, Daniel Stern, Andrea Comastri, Franz E. Bauer, Finn Erland Christensen, Claudio Ricci, M. Brightman, Mislav Baloković, Duncan Farrah, Simonetta Puccetti, P. G. Boorman, William W. Zhang, Poshak Gandhi, Alberto Masini, Masini, A., Comastri, A., Puccetti, S., Baloković, M., Gandhi, P., Guainazzi, M., Bauer, F.E., Boggs, S.E., Boorman, P.G., Brightman, M., Christensen, F.E., Craig, W.W., Farrah, D., Hailey, C.J., Harrison, F.A., Koss, M.J., Lamassa, S.M., Ricci, C., Stern, D., Walton, D.J., and Zhang, W.W.
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Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Seyfert [Galaxies] ,active [Galaxies] ,biology ,010308 nuclear & particles physics ,galaxies: active ,Flux ,FOS: Physical sciences ,Astronomy and Astrophysics ,Context (language use) ,Astrophysics ,Astronomy and Astrophysic ,biology.organism_classification ,01 natural sciences ,Galaxy ,galaxies: Seyfert ,galaxies [X-rays] ,X-rays: galaxies ,Space and Planetary Science ,0103 physical sciences ,Astrophysics - High Energy Astrophysical Phenomena ,Phoenix ,010303 astronomy & astrophysics ,X-rays: galaxie - Abstract
著者人数: 21名, Accepted: 2016-09-01, 資料番号: SA1160316000
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- 2016
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12. NuSTAR reveals extreme absorption in z < 0.5 Type 2 quasars
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Finn Erland Christensen, Fiona A. Harrison, C. J. Hailey, Franz E. Bauer, A. Del Moro, Francesca Civano, James Aird, Roberto J. Assef, Birong Luo, Brian W. Grefenstette, Daniel Stern, Michael Koss, David M. Alexander, L. Zappacosta, Stephanie M. LaMassa, A. Annuar, Simonetta Puccetti, Ryan C. Hickox, M. Brightman, Andrea Comastri, S. E. Boggs, George B. Lansbury, William W. Craig, Poshak Gandhi, William W. Zhang, Mislav Baloković, W. N. Brandt, Ezequiel Treister, David R. Ballantyne, Cristian Vignali, Lansbury, G.B., Gandhi, P., Alexander, D.M., Assef, R.J., Aird, J., Annuar, A., Ballantyne, D.R., Baloković, M., Bauer, F.E., Boggs, S.E., Brandt, W.N., Brightman, M., Christensen, F.E., Civano, F., Comastri, A., Craig, W.W., Del Moro, A., Grefenstette, B.W., Hailey, C.J., Harrison, F.A., Hickox, R.C., Koss, M., Lamassa, S.M., Luo, B., Puccetti, S., Stern, D., Treister, E., Vignali, C., Zappacosta, L., Zhang, W.W., ITA, and USA
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Physics ,education.field_of_study ,active [Galaxies] ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Population ,galaxies: active ,Astrophysics::Instrumentation and Methods for Astrophysics ,Astronomy and Astrophysics ,Quasar ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Type (model theory) ,01 natural sciences ,Astrophysics - Astrophysics of Galaxies ,Redshift ,galaxies [X-rays] ,X-rays: galaxies ,Space and Planetary Science ,0103 physical sciences ,Source counts ,Absorption (electromagnetic radiation) ,education ,Astrophysics - High Energy Astrophysical Phenomena ,010303 astronomy & astrophysics - Abstract
The intrinsic column density (NH) distribution of quasars is poorly known. At the high obscuration end of the quasar population and for redshifts z 1.5e24 cm^-2) type 2 quasars (CTQSO2s); five new NuSTAR observations are reported herein, and four have been previously published. The candidate CTQSO2s lie at z~ 90 net source counts at 8-24 keV). For these NuSTAR-detected sources direct (i.e., X-ray spectral) constraints on the intrinsic AGN properties are feasible, and we measure column densities ~2.5-1600 times higher and intrinsic (unabsorbed) X-ray luminosities ~10-70 times higher than pre-NuSTAR constraints from Chandra and XMM-Newton. Assuming the NuSTAR-detected type 2 quasars are representative of other Compton-thick candidates, we make a correction to the NH distribution for optically selected type 2 quasars as measured by Chandra and XMM-Newton for 39 objects. With this approach, we predict a Compton-thick fraction of f_CT = 36^{+14}_{-12} %, although higher fractions (up to 76%) are possible if indirect absorption diagnostics are assumed to be reliable., Comment: 19 pages, 13 figures, 5 tables. Accepted for publication in ApJ
- Published
- 2015
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