Origin of thermal and non-thermal hard X-ray emission from the galactic center

Vladimir A. Dogiel; Dmitrii O. Chernyshov; Takayuki Yuasa; Dmitrii Prokhorov; Kwong Sang Cheng; Aya Bamba; Hajime Inoue; Chung Ming Ko; Motohide Kokubun; Yoshitomo Maeda; Kazuhisa Mitsuda; Kazuhiro Nakazawa; Noriko Y. Yamasaki

doi:10.1093/pasj/61.5.1099

Origin of thermal and non-thermal hard X-ray emission from the galactic center

Vladimir A. Dogiel, Dmitrii O. Chernyshov, Takayuki Yuasa, Dmitrii Prokhorov, Kwong Sang Cheng, Aya Bamba, Hajime Inoue, Chung Ming Ko, Motohide Kokubun, Yoshitomo Maeda, Kazuhisa Mitsuda, Kazuhiro Nakazawa, Noriko Y. Yamasaki

Graduate Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We analyse new results of Chandra and Suzaku Observatories which found a flux of hard X-ray emission from the compact region around Sgr A ^* (r ∼ 100 pc). We suppose that this emission is generated by accretion processes onto the central supermassive blackhole when an unbound part of captured stars obtains an additional momentum. As a result a flux of subrelativistic protons is generated near the galactic center which heats the background plasma up to temperatures about 6-10 keV and produces by inverse bremsstrahlung a flux of non-thermal X-ray emission in the energy range above 10 keV.

Original language	English
Pages (from-to)	1099-1105
Number of pages	7
Journal	Publications of the Astronomical Society of Japan
Volume	61
Issue number	5
DOIs	https://doi.org/10.1093/pasj/61.5.1099
State	Published - 2009

Keywords

Galaxy: center
ISM: cosmic rays
X-rays: diffuse background

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Dogiel, V. A., Chernyshov, D. O., Yuasa, T., Prokhorov, D., Cheng, K. S., Bamba, A., Inoue, H., Ko, C. M., Kokubun, M., Maeda, Y., Mitsuda, K., Nakazawa, K., & Yamasaki, N. Y. (2009). Origin of thermal and non-thermal hard X-ray emission from the galactic center. Publications of the Astronomical Society of Japan, 61(5), 1099-1105. https://doi.org/10.1093/pasj/61.5.1099

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abstract = "We analyse new results of Chandra and Suzaku Observatories which found a flux of hard X-ray emission from the compact region around Sgr A * (r ∼ 100 pc). We suppose that this emission is generated by accretion processes onto the central supermassive blackhole when an unbound part of captured stars obtains an additional momentum. As a result a flux of subrelativistic protons is generated near the galactic center which heats the background plasma up to temperatures about 6-10 keV and produces by inverse bremsstrahlung a flux of non-thermal X-ray emission in the energy range above 10 keV.",

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author = "Dogiel, {Vladimir A.} and Chernyshov, {Dmitrii O.} and Takayuki Yuasa and Dmitrii Prokhorov and Cheng, {Kwong Sang} and Aya Bamba and Hajime Inoue and Ko, {Chung Ming} and Motohide Kokubun and Yoshitomo Maeda and Kazuhisa Mitsuda and Kazuhiro Nakazawa and Yamasaki, {Noriko Y.}",

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T1 - Origin of thermal and non-thermal hard X-ray emission from the galactic center

AU - Dogiel, Vladimir A.

AU - Chernyshov, Dmitrii O.

AU - Yuasa, Takayuki

AU - Prokhorov, Dmitrii

AU - Cheng, Kwong Sang

AU - Bamba, Aya

AU - Inoue, Hajime

AU - Ko, Chung Ming

AU - Kokubun, Motohide

AU - Maeda, Yoshitomo

AU - Mitsuda, Kazuhisa

AU - Nakazawa, Kazuhiro

AU - Yamasaki, Noriko Y.

PY - 2009

Y1 - 2009

N2 - We analyse new results of Chandra and Suzaku Observatories which found a flux of hard X-ray emission from the compact region around Sgr A * (r ∼ 100 pc). We suppose that this emission is generated by accretion processes onto the central supermassive blackhole when an unbound part of captured stars obtains an additional momentum. As a result a flux of subrelativistic protons is generated near the galactic center which heats the background plasma up to temperatures about 6-10 keV and produces by inverse bremsstrahlung a flux of non-thermal X-ray emission in the energy range above 10 keV.

AB - We analyse new results of Chandra and Suzaku Observatories which found a flux of hard X-ray emission from the compact region around Sgr A * (r ∼ 100 pc). We suppose that this emission is generated by accretion processes onto the central supermassive blackhole when an unbound part of captured stars obtains an additional momentum. As a result a flux of subrelativistic protons is generated near the galactic center which heats the background plasma up to temperatures about 6-10 keV and produces by inverse bremsstrahlung a flux of non-thermal X-ray emission in the energy range above 10 keV.

KW - Galaxy: center

KW - ISM: cosmic rays

KW - X-rays: diffuse background

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U2 - 10.1093/pasj/61.5.1099

DO - 10.1093/pasj/61.5.1099

M3 - 期刊論文

AN - SCOPUS:72149134911

VL - 61

SP - 1099

EP - 1105

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

SN - 0004-6264

IS - 5

ER -

Origin of thermal and non-thermal hard X-ray emission from the galactic center

Abstract

Keywords

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