XMM‐NewtonObservations of an Intermediate X‐Ray Object in NGC 2276

Autor:	David S. Davis, Richard Mushotzky
Rok vydání:	2004
Předmět:	Physics Black hole Accretion disc Space and Planetary Science Astrophysics::High Energy Astrophysical Phenomena ROSAT Astronomy and Astrophysics Black-body radiation Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics::Galaxy Astrophysics Galaxy Luminosity
Zdroj:	The Astrophysical Journal. 604:653-661
ISSN:	1538-4357 0004-637X
DOI:	10.1086/381929
Popis:	We present the results from a ~53 ksec XMM observation of NGC 2276. This galaxy has an unusual optical morphology with the disk of this spiral appearing to be truncated along the western edge. This XMM observation shows that the X-ray source at the western edge is a bright Intermediate X-ray Object (IXO). Its spectrum is well fit by a multi-color disk blackbody model used to fit optically thick standard accretion disks around black holes. The luminosity derived for this IXO is 1.1x10^41 erg/s in the 0.5 - 10 keV band making it one of the most luminous discovered to date. The large source luminosity implies a large mass black hole if the source is radiating at the Eddington rate. On the other hand, the inner disk temperature determined here is too high for such a massive object given the standard accretion disk model. In addition to the IXO we find that the nuclear source in this galaxy has dimmed by at least a factor of several thousand in the eight years since the ROSAT HRI observations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ecc1a22531e70ad765958ba3ed792fd2 https://doi.org/10.1086/381929 Zobrazit plný text záznamu