Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1768289 | Advances in Space Research | 2006 | 4 Pages |
Abstract
We present a detailed analysis of XMM archival data of two Ultraluminous X-ray Sources (ULXs) in the nearby spiral galaxy NGC 1313: NGC 1313 X-1 and X-2. The spectral continuum of these sources was modeled with a soft thermal component plus a power-law. If the soft component originates from an accretion disk, the inferred mass of the compact remnant is â³100Mâ, making it an Intermediate Mass Black Hole (IMBH). A detailed analysis of the residuals of the XMM EPIC-pn spectrum shows some evidence for the presence of an Oxygen emission line in NGC 1313 X-1. The simultaneous presence of an excess in emission, although at a much reduced significance level, at different energies in the X-ray spectra of NGC 1313 X-1 and X-2 is suggestive of typical emission lines from young supernova remnants. An optical counterpart for NGC 1313 X-2 was also identified. On an ESO 3.6-m image, the Chandra error box embraces a R â¼Â 23 mag stellar-like object and excludes a previously proposed optical counterpart.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
R. Turolla, P. Mucciarelli, L. Zampieri, R. Falomo, M. Chieregato, A. Treves,