File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1086/500359
- Scopus: eid_2-s2.0-33745300213
- WOS: WOS:000236817800022
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Capture of a red giant by the black hole Sagittarius A* as a possible origin for the TeV gamma rays from the galactic center
Title | Capture of a red giant by the black hole Sagittarius A* as a possible origin for the TeV gamma rays from the galactic center |
---|---|
Authors | |
Keywords | Accretion, Accretion Disks Black Hole Physics Galaxies: Active Galaxies: Jets Galaxy: Center |
Issue Date | 2006 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 |
Citation | Astrophysical Journal Letters, 2006, v. 641 n. 1 I, p. 288-292 How to Cite? |
Abstract | Nonthermal TeV γ-ray emission within a multiparsec scale has been observed from the center region of our Galaxy. We argue that these γ-rays are the result of transient activity of the massive black hole Sgr A* that resides at the Galactic center. Several thousand years ago, the black hole may have experienced an active phase by capturing a red giant star and forming an accretion disk, temporarily behaving like an active galactic nucleus. A powerful jet, which contains plenty of high-speed protons, was launched during the process. These runaway protons interact with the dense ambient medium, producing TeV γ-ray emission through the π0-decay process. We show that the total energy deposited in this way is large enough to account for observations. The diffusion length of protons is also consistent with the observed size of the TeV source. © 2006. The American Astronomical Society. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/175019 |
ISSN | 2023 Impact Factor: 8.8 2023 SCImago Journal Rankings: 2.766 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lu, Y | en_US |
dc.contributor.author | Cheng, KS | en_US |
dc.contributor.author | Huang, YF | en_US |
dc.date.accessioned | 2012-11-26T08:48:47Z | - |
dc.date.available | 2012-11-26T08:48:47Z | - |
dc.date.issued | 2006 | en_US |
dc.identifier.citation | Astrophysical Journal Letters, 2006, v. 641 n. 1 I, p. 288-292 | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/175019 | - |
dc.description.abstract | Nonthermal TeV γ-ray emission within a multiparsec scale has been observed from the center region of our Galaxy. We argue that these γ-rays are the result of transient activity of the massive black hole Sgr A* that resides at the Galactic center. Several thousand years ago, the black hole may have experienced an active phase by capturing a red giant star and forming an accretion disk, temporarily behaving like an active galactic nucleus. A powerful jet, which contains plenty of high-speed protons, was launched during the process. These runaway protons interact with the dense ambient medium, producing TeV γ-ray emission through the π0-decay process. We show that the total energy deposited in this way is large enough to account for observations. The diffusion length of protons is also consistent with the observed size of the TeV source. © 2006. The American Astronomical Society. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 | en_US |
dc.relation.ispartof | Astrophysical Journal Letters | en_US |
dc.subject | Accretion, Accretion Disks | en_US |
dc.subject | Black Hole Physics | en_US |
dc.subject | Galaxies: Active | en_US |
dc.subject | Galaxies: Jets | en_US |
dc.subject | Galaxy: Center | en_US |
dc.title | Capture of a red giant by the black hole Sagittarius A* as a possible origin for the TeV gamma rays from the galactic center | en_US |
dc.type | Article | en_US |
dc.identifier.email | Cheng, KS: hrspksc@hkucc.hku.hk | en_US |
dc.identifier.authority | Cheng, KS=rp00675 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1086/500359 | en_US |
dc.identifier.scopus | eid_2-s2.0-33745300213 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-33745300213&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 641 | en_US |
dc.identifier.issue | 1 I | en_US |
dc.identifier.spage | 288 | en_US |
dc.identifier.epage | 292 | en_US |
dc.identifier.isi | WOS:000236817800022 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Lu, Y=7405476987 | en_US |
dc.identifier.scopusauthorid | Cheng, KS=9745798500 | en_US |
dc.identifier.scopusauthorid | Huang, YF=24448042100 | en_US |
dc.identifier.issnl | 2041-8205 | - |