Catalog Service: Spectral fit of ULX sources
Description
Data from Chandra observations of 30 nearby galaxies were analyzed and 365 X-ray point sources were chosen whose spectra were not contaminated by excessive diffuse emission and not affected by photon pileup. The spectra of these sources were fitted using two spectral models (an absorbed power-law and a disk blackbody) to ascertain the dependence of estimated parameters on the spectral model used. It was found that the cumulative luminosity function depends on the choice of the spectral model, especially for luminosities >10^40^ergs/s. A large number (~80) of the sources have luminosities >10^39^ergs/s (ultraluminous X-ray sources) with indistinguishable average spectral parameters (inner disk temperature ~1keV and/or photon index GAMMA~2) with those of the lower luminosity ones.
This section describes who is responsible for this resource
Publisher: CDSivo://CDS[Pub. ID]
Contact Information:
This section provides some status information: the resource version, availability, and relevant dates.
This resource was registered on: 2009 Oct 29 12:43:06ZThis resource description was last updated on: 2021 Oct 21 00:00:00Z
This section describes what the resource is, what it contains, and how it might be relevant.
Related Resources:
This section describes the data's coverage over the sky, frequency, and time.
Wavebands covered:
This section describes the rights and usage information for this data.
This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource.
This is a standard IVOA service that takes as input an ADQL or PQL query and returns tabular data.
This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.
Cone search capability for table J/ApJ/664/458/table1 (Sample galaxy properties)
VERB=1
VERB=3
Cone search capability for table J/ApJ/664/458/Xsources (Spectral fit of X-ray sources with power-law and blackbody disk models)
Cone search capability for table J/ApJ/664/458/table2 (List of sources with count rate > 0.05counts/s)
Developed with the support of the National Science Foundation under Cooperative Agreement AST0122449 with the Johns Hopkins University The NAVO project is a member of the International Virtual Observatory Alliance
This NAVO Application is hosted by the Space Telescope Science Institute