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Article: The ultraluminous X-ray sources near the center of M82

TitleThe ultraluminous X-ray sources near the center of M82
Authors
KeywordsBlack hole physics
Galaxies: individual (M82)
Supernova remnants
X-rays: binaries
X-rays: galaxies
Issue Date2007
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2007, v. 671 n. 1, p. 349-357 How to Cite?
AbstractWe report the identification of a recurrent ultraluminous X-ray source (ULX), a highly absorbed X-ray source (possibly a background AGN), and a young supernova remnant near the center of the starburst galaxy M82. From a series of Chandra observations taken from 1999 to 2005, we found that the transient ULX first appeared in 1999 October. The source turned off in 2000 January, but later reappeared and has been active since then. The X-ray luminosity of this source varies frombelow the detection level(∼2.5 × 10 38 ergs s -1) to its active state between ∼7 × 10 39 and 1.3 × 10 40 ergs s -1 (in the 0.5-10 keV energy band) and shows unusual spectral changes. The X-ray spectra of some Chandra observations are best fitted with an absorbed power-law model with photon index ranging from 1.3 to 1.7. These spectra are similar to those of Galactic black hole binary candidates seen in the low/hard state, except that a very hard spectrum was seen in one of the observations. By comparing with near-infrared images taken with the Hubble Space Telescope, the ULX is found to be located within a young star cluster. Radio imaging indicates that it is associated with a H II region. We suggest that the ULX is likely to be a >100 M ⊙ intermediate-mass black hole in the low/hard state. In addition to the transient ULX, we also found a highly absorbed hard X-ray source which is likely to be an AGN and an ultraluminous X-ray-emitting young supernova remnant which may be related to a 100 yr old gamma-ray burst event, within 2″ of the transient ULX. © 2007. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/81061
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorKong, AKHen_HK
dc.contributor.authorYang, YJen_HK
dc.contributor.authorHsieh, PYen_HK
dc.contributor.authorMak, DSYen_HK
dc.contributor.authorPun, CSJen_HK
dc.date.accessioned2010-09-06T08:13:19Z-
dc.date.available2010-09-06T08:13:19Z-
dc.date.issued2007en_HK
dc.identifier.citationAstrophysical Journal Letters, 2007, v. 671 n. 1, p. 349-357en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/81061-
dc.description.abstractWe report the identification of a recurrent ultraluminous X-ray source (ULX), a highly absorbed X-ray source (possibly a background AGN), and a young supernova remnant near the center of the starburst galaxy M82. From a series of Chandra observations taken from 1999 to 2005, we found that the transient ULX first appeared in 1999 October. The source turned off in 2000 January, but later reappeared and has been active since then. The X-ray luminosity of this source varies frombelow the detection level(∼2.5 × 10 38 ergs s -1) to its active state between ∼7 × 10 39 and 1.3 × 10 40 ergs s -1 (in the 0.5-10 keV energy band) and shows unusual spectral changes. The X-ray spectra of some Chandra observations are best fitted with an absorbed power-law model with photon index ranging from 1.3 to 1.7. These spectra are similar to those of Galactic black hole binary candidates seen in the low/hard state, except that a very hard spectrum was seen in one of the observations. By comparing with near-infrared images taken with the Hubble Space Telescope, the ULX is found to be located within a young star cluster. Radio imaging indicates that it is associated with a H II region. We suggest that the ULX is likely to be a >100 M ⊙ intermediate-mass black hole in the low/hard state. In addition to the transient ULX, we also found a highly absorbed hard X-ray source which is likely to be an AGN and an ultraluminous X-ray-emitting young supernova remnant which may be related to a 100 yr old gamma-ray burst event, within 2″ of the transient ULX. © 2007. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.subjectBlack hole physicsen_HK
dc.subjectGalaxies: individual (M82)en_HK
dc.subjectSupernova remnantsen_HK
dc.subjectX-rays: binariesen_HK
dc.subjectX-rays: galaxiesen_HK
dc.titleThe ultraluminous X-ray sources near the center of M82en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=671&spage=349&epage=357&date=2007&atitle=The+ultraluminous+X-ray+sources+near+the+center+of+M82en_HK
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_HK
dc.identifier.authorityPun, CSJ=rp00772en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1086/522291en_HK
dc.identifier.scopuseid_2-s2.0-40249094436en_HK
dc.identifier.hkuros141915en_HK
dc.identifier.volume671en_HK
dc.identifier.issue1en_HK
dc.identifier.spage349en_HK
dc.identifier.epage357en_HK
dc.identifier.isiWOS:000253331400029-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridKong, AKH=35185316600en_HK
dc.identifier.scopusauthoridYang, YJ=51562955800en_HK
dc.identifier.scopusauthoridHsieh, PY=9841991200en_HK
dc.identifier.scopusauthoridMak, DSY=23967776400en_HK
dc.identifier.scopusauthoridPun, CSJ=7003931846en_HK

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