XMMSSCLWBD - XMM-Newton 2XMMi-DR3 Selected Source Detections Catalog

Overview

The authors have carried out a classification of 4,330 X-ray sources in the 2XMMi-DR3 catalog. The sources were selected under the requirement of being a point source with multiple XMM-Newton observations and at least one detection with a signal-to-noise ratio larger than 20. For about one-third of the sources, the authors are able to obtain reliable source types from the literature. They mostly correspond to various types of stars (611), active galactic nuclei (AGNs, 753), and compact object systems (138) containing white dwarfs, neutron stars, and stellar-mass black holes. The authors find that about 99% of stars can be separated from other source types based on their low X-ray-to-IR flux ratios and frequent X-ray flares. AGNs have remarkably similar X-ray spectra, with the power-law photon index centered around 1.91 +/- 0.31, and their 0.2-4.5 keV flux long-term variation factors have a median of 1.48, with 98.5% being less than 10. In contrast, 70% of compact object systems can be very soft or hard, highly variable in X-rays, and/or have very large X-ray-to-IR flux ratios, separating them from AGNs. Using these results, the authors derive a source type classification scheme to classify the other sources and find 644 candidate stars, 1,376 candidate AGNs, and 202 candidate compact object systems, whose false identification probabilities are estimated to be about 1%, 3%, and 18%, respectively. There are still 320 sources associated with nearby galaxies and 151 in the Galactic plane, which the authors expect to be mostly compact object systems or background AGNs. There are also 100 candidate ultraluminous X-ray sources. They are found to be much less variable than other accreting compact objects.

This table contains the list of 19,637 detections of the 4,330 unique X-ray sources which comprise the authors' sample. The list of 4,330 unique X-ray sources and their classifications is also available as the HEASARC XMMSSCLWBS table.

Catalog Bibcode

2012ApJ...756...27L

References

Classification of X-Ray Sources in the XMM-Newton Serendipitous Source Catalog
     Lin D., Webb N.A., Barret D.
    <Astrophys. J. 756, 27 (2012)>
    =2012ApJ...756...27L

Provenance

This table was created by the HEASARC in October 2012 based on an electronic version of Table 3 from the reference paper which was obtained from the ApJ web site.

Parameters

SrcID
The unique source identifier used for the source by the authors in the present study. For a unique entry in this table, a detection is specified by the combination of obsid and dr3_srcid (q.v.), which are 'OBS_ID' and 'SRCID' in the 2XMMi-DR3 catalog, respectively. The value of srcid is different from dr3_srcid only when several 'unique' sources in the 2XMMi-DR3 catalog are rematched together (see Table 1 of the reference paper). When the source has no detection in the 2XMMi-DR3 catalog for an observation, the corresponding SRCIDDet is empty, and the fit was not carried out. There are 17 detections not used in the present study (thus not in this table too), because of a large discrepancy between the pn and MOS measurements or of the large extended radius used in the 2XMMi-DR3 catalog (causing fake large fluxes).

Name
The 2XMMi-DR3 source designation based on its J2000.0 equatorial coordinates, e.g., '2XMM J005412.9-373309', '2XMMi J170058.4-461107', etc. This was not present in the original table upon which this HEASARC table was created (Table 3) but was taken from Table 4 of the same reference.

RA
The mean Right Ascension of the X-ray source in the selected equinox. This was given in J2000.0 coordinates to a precision of 10^-5 degrees (0.036 arcseconds) in the original table (Table 4 of the reference paper).

Dec
The mean Declination of the X-ray source in the selected equinox. This was given in J2000.0 coordinates to a precision of 10^-5 degrees (0.036 arcseconds) in the original table (Table 4 of the reference paper).

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

ObsID
The XMM-Newton observation identification. .

DR3_SrcID
The unique source identifier used for the source in the 2XMM-DR3 Catalog. For a unique entry in this table, a detection is specified by the combination of obsid and dr3_srcid (q.v.), which are 'OBS_ID' and 'SRCID' in the 2XMMi-DR3 catalog, respectively. The value of srcid is different from dr3_srcid only when several 'unique' sources in the 2XMMi-DR3 catalog are rematched together (see Table 1 of the reference paper). When the source has no detection in the 2XMMi-DR3 catalog for an observation, the corresponding SRCIDDet is empty, and the fit was not carried out. There are 17 detections not used in the present study (thus not in this table too), because of a large discrepancy between the pn and MOS measurements or of the large extended radius used in the 2XMMi-DR3 catalog (causing fake large fluxes).

M1_1_Rate
The MOS1-medium-filter equivalent count rate CR₁ for the detection in band 1 (0.2 - 0.5 keV), in counts per second.

M1_1_Rate_Error
The uncertainty in the corresponding count rate, in counts per second.

M1_2_Rate
The MOS1-medium-filter equivalent count rate CR₂ for the detection in band 2 (0.5 - 1.0 keV), in counts per second.

M1_2_Rate_Error
The uncertainty in the corresponding count rate, in counts per second.

M1_3_Rate
The MOS1-medium-filter equivalent count rate CR₃ for the detection in band 3 (1.0 - 2.0 keV), in counts per second.

M1_3_Rate_Error
The uncertainty in the corresponding count rate, in counts per second.

M1_4_Rate
The MOS1-medium-filter equivalent count rate CR₄ for the detection in band 4 (2.0 - 4.5 keV), in counts per second.

M1_4_Rate_Error
The uncertainty in the corresponding count rate, in counts per second.

M1_5_Rate
The MOS1-medium-filter equivalent count rate CR₅ for the detection in band 5 (4.5 - 12.0 keV), in counts per second.

M1_5_Rate_Error
The uncertainty in the corresponding count rate, in counts per second.

Reduced_Chi2
The reduced Chi² of the spectral fit to the detection using an absorbed power-law spectrum.

DoF
The number of degrees of freedom of the spectral fit to the detection using an absorbed power-law spectrum.

NH
The best-fitting absorbing column density N_H, in H atoms cm^-2, for the spectral fit to the detection using an absorbed power-law spectrum.

NH_Lower
The lower 90%-confidence bound to the best-fitting absorbing column density N_H, in H atoms cm^-2.

NH_Upper
The upper 90%-confidence bound to the best-fitting absorbing column density N_H, in H atoms cm^-2.

Photon_Index
The best-fitting power-law photon index Gamma of the spectral fit to the detection using an absorbed power law spectrum.

Photon_Index_Lower
The lower 90%-confidence bound to the best-fitting power-law photon index Gamma of the spectral fit to the detection using an absorbed power law spectrum.

Photon_Index_Upper
The upper 90%-confidence bound to the best-fitting power-law photon index Gamma of the spectral fit to the detection using an absorbed power law spectrum.

Flux
The 0.2-12 keV (band 8) flux, in erg cm^-2 s^-1, for the best-fitting absorbed power-law model to the detected spectrum.

Flux_Lower
The lower 90%-confidence bound to the 0.2-12 keV (band 8) flux, in erg cm^-2 s^-1, for the best-fitting absorbed power-law model to the detected spectrum.

Flux_Upper
The upper 90%-confidence bound to the 0.2-12 keV (band 8) flux, in erg cm^-2 s^-1, for the best-fitting absorbed power-law model to the detected spectrum.

Contact Person

Questions regarding the XMMSSCLWBD database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:37:26 EDT