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LOCKMANXM2: Help

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/cm^2, 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/cm^2. 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/cm^2. 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 = 5.7x10^19 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/cm^2.

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/cm^2. 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 = 5.7x10^19 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/cm^2.

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/cm^2. 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 = 5.7x10^19 cm^-2.Flux in 5.0-10.0keV Band (erg/s/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/cm^2.

Hardness_Ratio_1
The hardness ratio HR_1 = (CR_2-CR_1)/(CR_2+CR_1), where CR_1 is the 0.5 - 2.0 keV count rate (sb_count_rate), and CR_2 is the 2.0 - 4.5 keV count rate (mb_count_rate).

Hardness_Ratio_1_Error
The uncertainty in the hardness ratio, HR_1.

Hardness_Ratio_2
The hardness ratio HR_2 = (CR_3-CR_2)/(CR_3+CR_2), where CR_2 is the 2.0 - 4.5 keV count rate (mb_count_rate), and CR_3 is the 4.5 - 10.0 keV count rate (uhb_count_rate).

Hardness_Ratio_2_Error
The uncertainty in the hardness ratio, HR_2.

Hardness_Ratio_3
The hardness Ratio HR_3 = (CR3-CR1)/(CR3+CR1), where CR_1 is the 0.5 - 2.0 keV count rate (sb_count_rate), and CR_3 is the 4.5 - 10.0 keV count rate (uhb_count_rate).

Hardness_Ratio_3_Error
The uncertainty in the hardness ratio, HR_3.

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 User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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