Spectral Evolution of a Luminous Compact X-Ray Source in NGC 253 with Chandra and XMM-Newton

Details Spectral Evolution of a Luminous Compact X-Ray Source in NGC 253 with Chandra and XMM-Newton Spectral Evolution of a Luminous Compact X-Ray Source in NGC 253 with Chandra and XMM-Newton

2005-06-27

arxiv.org/abs/astro-ph/0506632v1

Publ.Astron.Soc.Jap. 57 (2005) 507

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures, 1 table

Scientific paper

Spectral studies of a luminous X-ray source, NGC 253 X21, are presented based on archival Chandra and XMM-Newton data. The Chandra observation on 1999 December 16 detected the source at a bolometric luminosity of 0.3 x 10^39 erg/s (assuming isotropic emission), while an XMM-Newton observation on 2000 June 3 revealed a short-term source variation in the range of (0.6--1.3) x 10^39 erg/s. All spectra from these observations were successfully modeled by emission from an optically thick accretion disk. The average inner disk radius was kept constant at 63 x (cos 60/cos i)^(1/2) km, where i is the disk inclination, and did not vary significantly, while the disk inner temperature changed in the range of 0.9--1.4 keV. Assuming that this object is an accreting Schwarzschild black hole, and that the disk inner radius coincides with its last stable orbit, the mass of the black hole is estimated to be ~ 7 M_sun. The disk luminosity corresponds to (30--120) x (cos 60/cos i) % of the Eddington limit of this black hole. Therefore, this luminous X-ray source, NGC 253 X21, is understood consistently to be an accreting stellar mass black hole in the standard disk state.

Affiliated with

Also associated with

No associations

Rating

Spectral Evolution of a Luminous Compact X-Ray Source in NGC 253 with Chandra and XMM-Newton does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spectral Evolution of a Luminous Compact X-Ray Source in NGC 253 with Chandra and XMM-Newton, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral Evolution of a Luminous Compact X-Ray Source in NGC 253 with Chandra and XMM-Newton will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-646916