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105 results on '"Boggs, S.E."'

1. Sensitivity of the GAPS experiment to low-energy cosmic-ray antiprotons

Author

Rogers, F., Aramaki, T., Boezio, M., Boggs, S.E., Bonvicini, V., Bridges, G., Campana, D., Craig, W.W., von Doetinchem, P., Everson, E., Fabris, L., Feldman, S., Fuke, H., Gahbauer, F., Gerrity, C., Hailey, C.J., Hayashi, T., Kawachi, A., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S.A.I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R.A., Osteria, G., Perez, K.M., Quinn, S., Re, V., Riceputi, E., Roach, B., Ryan, J., Saffold, N., Scotti, V., Shimizu, Y., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yee, K., Yoshida, A., Yoshida, T., Zampa, G., Zeng, J., and Zweerink, J.

Published
2023
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2. Cosmic antihelium-3 nuclei sensitivity of the GAPS experiment

Author

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.

Published
2021
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9. The flight of the GAPS prototype experiment

Author

von Doetinchem, P., Aramaki, T., Bando, N., Boggs, S.E., Fuke, H., Gahbauer, F.H., Hailey, C.J., Koglin, J.E., Mognet, S.A.I., Madden, N., Okazaki, S., Ong, R.A., Perez, K.M., Yoshida, T., and Zweerink, J.

Published
2014
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11. An ultraluminous X-ray source powered by an accreting neutron star

Author

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.

Subjects
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 [...]

Published
2014

12. Asymmetries in core-collapse supernovae from maps of radioactive [sup.44]Ti in Cassiopeia A

Author

Grefenstette, B.W., Harrison, F.A., Boggs, S.E., Reynolds, S.P., Fryer, C.L., Madsen, K.K., Wik, D.R., Zoglauer, A., Ellinger, C.I., Alexander, D.M., An, H., Barret, D., Christensen, F.E., Craig, W.W., Forster, K., Giommi, P., Hailey, C.J., Hornstrup, A., Kaspi, V.M., Kitaguchi, T., Koglin, J.E., Mao, P.H., Miyasaka, H., Mori, K., Perri, M., Pivovaroff, M.J., Puccetti, S., Rana, V., Stern, D., Westergaard, N.J., and Zhang, W.W.

Subjects
Supernovae -- Natural history, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Asymmetry is required by most numerical simulations of stellar core-collapse explosions, but the form it takes differs significantly among models. The spatial distribution of radioactive [sup.44]Ti, synthesized in an exploding star near the boundary between material falling back onto the collapsing core and that ejected into the surrounding medium (1), directly probes the explosion asymmetries. Cassiopeia A is a young (2), nearby (3), core-collapse (4) remnant from which [sup.44]Ti emission has previously been detected (5-8) but not imaged. Asymmetries in the explosion have been indirectly inferred from a high ratio of observed [sup.44]Ti emission to estimated [sup.56]Ni emission (9), from optical light echoes (10), and from jet-like features seen in the X-ray (11) and optical (12) ejecta. Here we report spatial maps and spectral properties of the [sup.44]Ti in Cassiopeia A. This may explain the unexpected lack of correlation between the [sup.44]Ti and iron X-ray emission, the latter being visible only in shock-heated material. The observed spatial distribution rules out symmetric explosions even with a high level of convective mixing, as well as highly asymmetric bipolar explosions resulting from a fast-rotating progenitor. Instead, these observations provide strong evidence for the development of low-mode convective instabilities in core-collapse supernovae., Titanium-44 is produced in Si burning in the innermost regions of the material ejected in core-collapse supernovae, in the same processes that produce Fe and [56.sup]Ni (ref. 13). The decay [...]

Published
2014
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14. The Nature of the Torus in the Heavily Obscured AGN Markarian 3: an X-Ray Study

Author

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.

Published
2016
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16. The ACT vision mission study simulation effort

Author

Wunderer, Cornelia B., Kippen, R.M., Bloser, P.F., Boggs, S.E., McConnell, M.L., Harris, M., Hoover, A., Klimenko, A.V., Novikova, E.I., Oberlack, U., Sturner, S., Tournear, D., Weidenspointner, G., and Zoglauer, A.

Published
2006
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17. Cosmic-ray antinuclei as messengers of new physics: status and outlook for the new decade

Author

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

Published
2020
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18. A rapidly spinning supermassive black hole at the centre of NGC 1365

Author

Risaliti, G., Harrison, F.A., Madsen, K.K., Walton, D.J., Boggs, S.E., Christensen, F.E., Craig, W.W., Grefenstette, B.W., Hailey, C.J., Nardini, E., Stern, Daniel, and Zhang, W.W.

Subjects
Black holes (Astronomy) -- Observations, Spiral galaxies -- Observations -- Spectra, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Broad X-ray emission lines from neutral and partially ionized iron observed in active galaxies have been interpreted as fluorescence produced by the reflection of hard X-rays off the inner edge [...]

Published
2013
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24. The prototype GAPS (pGAPS) experiment

Author

Mognet, S.A.I., primary, Aramaki, T., additional, Bando, N., additional, Boggs, S.E., additional, von Doetinchem, P., additional, Fuke, H., additional, Gahbauer, F.H., additional, Hailey, C.J., additional, Koglin, J.E., additional, Madden, N., additional, Mori, K., additional, Okazaki, S., additional, Ong, R.A., additional, Perez, K.M., additional, Tajiri, G., additional, Yoshida, T., additional, and Zweerink, J., additional

Published
2014
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26. Detector module development for the High Efficiency Multimode Imager

Author

Amman, M., primary, Luke, P.N., additional, Lee, J.S., additional, Mihailescu, L., additional, Vetter, K., additional, Zoglauer, A., additional, Wunderer, C.B., additional, Galloway, M., additional, Boggs, S.E., additional, Chen, H., additional, Marthandam, P., additional, Awadalla, S., additional, Taherion, S., additional, and Bindley, G., additional

Published
2009
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31. The spring 2009 balloon flight of the Nuclear Compton Telescope.

Author

Bandstra, M.S., Bellm, E.C., Jeng-Lun Chiu, Jau-Shian Liang, Zong-Kai Liu, Perez-Becker, D., Zoglauer, A., Boggs, S.E., Hsiang-Kuang Chang, Yuan-Hann Chang, Huang, M.-H.A., Amman, M., Shiuan Juang Chiang, Wei-Che Hung, Jean, P., Chih-Hsun Lin, Luke, P.N., Ray-Shine Run, and Wunderer, C.B.

Published
2009
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42. A High Resolution Gamma-ray and Hard X-ray Spectrometer (HIREGS) for Long Duration Balloon Flights

Author

Boggs, S.E., primary, Lin, R.P., additional, Feffer, P.T., additional, Slassi-Sennou, S., additional, McBride, S., additional, Primbsch, J.H., additional, Youssefi, K., additional, Zimmer, G., additional, Cork, C., additional, Luke, P., additional, Madden, N., additional, Malone, D., additional, Pehl, R., additional, Pelling, M., additional, Cotin, F., additional, and Vedrenne, G., additional

Published
1998
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43. Event reconstruction in high resolution Compton telescopes

Author

Boggs, S.E. and Jean, P.

Abstract

The development of germanium Compton telescopes for nuclear $\gamma$ -ray astrophysics ( $\sim 0.2-20$ MeV) requires new event reconstruction techniques to accurately determine the initial direction and energy of photon events, as well as to consistently reject background events. This paper describes techniques for event reconstruction, accounting for realistic instrument/detector performance and uncertainties. An especially important technique is Compton Kinematic Discrimination, which allows proper interaction ordering and background rejection with high probabilities. The use of these techniques are crucial for the realistic evaluation of the performance and sensitivity of any germanium Compton telescope configuration.

Published
2000

45. Developments toward the Nuclear Compton Telescope

Author

Boggs, S.E., primary, Amrose, S., additional, Coburn, W., additional, Holland, G., additional, Lin, R.P., additional, Millan, R., additional, Smith, D., additional, Amman, M., additional, Burks, M.T., additional, Hull, E.L., additional, Luke, P.N., additional, Madden, N.W., additional, Jean, P., additional, vonBallmoos, P., additional, Craig, W., additional, and Ziock, K., additional

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