LOCKMANXM2 - Lockman Hole XMM-Newton X-Ray Point Source Catalog

Overview

The Lockman Hole represents the sky area of lowest Galactic line-of-sight columns density. It was observed by the XMM-Newton X-ray observatory in 18 pointings performed between April 2000 and December 2002. The total exposure time spent on the field was 1.16 Ms (EPIC pn detector; EPIC MOS detector: 1.30 Ms). The effective exposure after removal of times of high particle background is 637 ks (EPIC pn detector; EPIC MOS detector: 765 ks). The catalog lists positions, count rates, fluxes, hardness ratios, and partial optical classifications of 409 X-ray point sources detected in the central 0.196 square degrees of the field down to a detection likelihood threshold in the full energy band of 10 (3.9 sigma), up to 4 of which may be spurious according to the authors' Monte Carlo simulations. The analysis was performed using the XMM-Newton SAS data analysis package version 6.0.

Catalog Bibcode

2008A&A...479..283B

References

XMM-Newton observations of the Lockman Hole:
X-ray source catalogue and number counts.
    Brunner H., Cappelluti N., Hasinger G., Barcons X., Fabian A.C.,
    Mainieri V., Szokoly G.
   <Astron. Astrophys., 479, 283-300 (2008)>
   =2008A&A...479..283B

Provenance

This table was created by the HEASARC in May 2008 based on the CDS Catalog J/A+A/479/283 file table3.dat.

Parameters

Source_Number
A unique identification number for each X-ray source in the catalog, as used, for example, in Fig. 3 of the reference paper.

Name
The name for the X-ray source using the '[BCH2008]' prefix (for Brunner, Cappelluti, Hasinger 2008) and the value of the source number parameter, as recommended by the CDS Dictionary of Nomenclature of Celestial Objects, e.g., '[BCH2008] 5'.

ROSAT_Source_Number
The source number of the ROSAT counterpart source as given by Lehmann et al., 2001, CDS Cat. J/A+A/371/833.

ROSAT_Class
The broad object classification of the ROSAT source, as given in Lehmann et al., 2001, A&A, 371, 833, Fig. 7), using the following types:

  STAR - Galactic Star
  GAL  - Galaxy
  ?GAL - Possible Galaxy
  AGNI - Type I AGN
  AGNII- Type II AGN
  GRP  - Galaxy Group
  CLUS - Cluster of Galaxies

XMM_Class
The broad object classification of the XMM-Newton source from the XMM follow-up (Szokoly et al., in preparation, Fig. 7), using the following types:

  STAR - Galactic Star
  GAL  - Galaxy
  ?GAL - Possible Galaxy
  AGNI - Type I AGN
  AGNII- Type II AGN
  GRP  - Galaxy Group
  CLUS - Cluster of Galaxies

Alt_Name
An alternative designation for the XMM-Newton source using the standard XMM-Newton source designation, e.g., XMMU JHHMMSS.s+DDMMSS.

RA
The Right Ascension of the XMM-Newton source in the selected equinox. The RA was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the XMM-Newton source in the selected equinox. The Dec was given in J2000.0 coordinates to a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the XMM-Newton source.

BII
The Galactic Latitude of the XMM-Newton source

Error_Radius
The positional error of the X-ray source, in arcseconds.

Detect_Likelihood
The detection likelihood of the X-ray source in the 0.5 - 10.0 keV band, rounded to the nearest integer. 409 X-ray point sources were detected in the central 0.196 square degrees of the field down to a detection likelihood threshold in the full energy band of 10 (3.9 sigma), up to 4 of which may be spurious according to the authors' Monte Carlo simulations.

Count_Rate
The X-ray source count rate in the 0.5 - 10.0 keV energy band, in ct/s. This is the combined all-EPIC point source count rate, corrected for telescope vignetting and for the fraction of counts outside the source extraction region.

Count_Rate_Error
The uncertainty in the X-ray source count rate in the 0.5 - 10.0 keV energy band, in ct/s.

Flux
The flux of the source in the 0.5 - 10.0 keV energy band, in erg/s/cm², being the sum of the 0.5 - 2.0 keV and 2.0 - 10.0 keV band fluxes.

Flux_Error
The uncertainty in the flux of the source in the 0.5 - 10.0 keV energy band, in erg/s/cm². This has been calculated by error propagation from the individual band flux errors.

SB_Detect_Likelihood
The detection likelihood of the X-ray source in the 0.5 - 2.0 keV band, rounded to the nearest integer.

SB_Count_Rate
The X-ray source count rate in the 0.5 - 2.0 keV energy band, in ct/s. This is the combined all-EPIC point source count rate, corrected for telescope vignetting and for the fraction of counts outside the source extraction region.

SB_Count_Rate_Error
The uncertainty in the X-ray source count rate in the 0.5 - 2.0 keV energy band, in ct/s.

SB_Flux
The flux of the source in the 0.5 - 2.0 keV energy band, in erg/s/cm². This was extrapolated from the source count rate by assuming an absorbed power-law spectrum with a spectral index Gamma = 2.0 and a Galactic column density N_H = 5.7x10¹⁹ cm^-2.

SB_Flux_Error
The uncertainty in the flux of the source in the 0.5 - 2.0 keV energy band, in erg/s/cm².

MB_Detect_Likelihood
The detection likelihood of the X-ray source in the 2.0 - 4.5 keV band, rounded to the nearest integer.

MB_Count_Rate
The X-ray source count rate in the 2.0 - 4.5 keV energy band, in ct/s. This is the combined all-EPIC point source count rate, corrected for telescope vignetting and for the fraction of counts outside the source extraction region.

MB_Count_Rate_Error
The uncertainty in the X-ray source count rate in the 2.0 - 4.5 keV energy band, in ct/s.

HB_Flux
The flux of the source in the 2.0 - 10.0 keV energy band, in erg/s/cm². This was extrapolated from the source count rate by assuming an absorbed power-law spectrum with a spectral index Gamma = 2.0 and a Galactic column density N_H = 5.7x10¹⁹ cm^-2.

HB_Flux_Error
The uncertainty in the flux of the source in the 2.0 - 10.0 keV energy band, in erg/s/cm².

UHB_Detect_Likelihood
The detection likelihood of the X-ray source in the 4.5 - 10.0 keV band, rounded to the nearest integer

UHB_Count_Rate
The X-ray source count rate in the 4.5 - 10.0 keV energy band, in ct/s. This is the combined all-EPIC point source count rate, corrected for telescope vignetting and for the fraction of counts outside the source extraction region.

UHB_Count_Rate_Error
The uncertainty in the X-ray source count rate in the 4.5 - 10.0 keV energy band, in ct/s

UHB_Flux
The flux of the source in the 5.0 - 10.0 keV energy band, in erg/s/cm². This was extrapolated from the source count rate by assuming an absorbed power-law spectrum with a spectral index Gamma = 2.0 and a Galactic column density N_H = 5.7x10¹⁹ cm^-2.

UHB_Flux_Error
The uncertainty in the flux of the source in the 5.0 - 10.0 keV energy band, in erg/s/cm².

Hardness_Ratio_1
The hardness ratio HR1 = (CR2-CR1)/(CR2+CR1), where CR1 is the 0.5 - 2.0 keV count rate (sb_count_rate), and CR2 is the 2.0 - 4.5 keV count rate (mb_count_rate).

Hardness_Ratio_1_Error
The uncertainty in the hardness ratio, HR1.

Hardness_Ratio_2
The hardness ratio HR2 = (CR3-CR2)/(CR3+CR2), where CR2 is the 2.0 - 4.5 keV count rate (mb_count_rate), and CR3 is the 4.5 - 10.0 keV count rate (uhb_count_rate).

Hardness_Ratio_2_Error
The uncertainty in the hardness ratio, HR2.

Hardness_Ratio_3
The hardness ratio HR3 = (CR3-CR1)/(CR3+CR1), where CR1 is the 0.5 - 2.0 keV count rate (sb_count_rate), and CR3 is the 4.5 - 10.0 keV count rate (uhb_count_rate).

Hardness_Ratio_3_Error
The uncertainty in the hardness ratio, HR3.

Class
The HEASARC Browse object classification, based on the value of either the rosat_class or xmm_class parameters.

Contact Person

Questions regarding the LOCKMANXM2 database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:30:06 EDT