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CEPAXMM: Help

CEPAXMM - Cepheus A SFR XMM-Newton X-Ray Point Source Catalog


Overview

Cepheus A is a star formation region (SFR) at a distance of ~ 730 pc consisting of two main H II regions, Cep A East and Cep A West. Cep A was observed with the EPIC cameras of the XMM-Newton observatory on 2003 August 23 for 43.9ks. In this observation, X-rays from both components of Cep A, East and West, were discovered by XMM-Newton, as well as from the Herbig-Haro object HH 168, which joins the ranks of other energetic H-H objects that are sources of temperature T >= 10^6 K X-ray emission. A total of 102 distinct X-ray sources were detected in this 44 ks observation, many presumed to be pre-main-sequence stars on the basis of the reddening of their optical and IR counterparts, the latter being found by matching the positions of the 102 X-ray sources with objects in the USNO-B1.0 (Monet et al. 2003, AJ, 125, 984) and Two Micron All Sky Survey (2MASS) catalogs using a 2.5" matching radius.

The authors performed source detection on all the XMM-Newton data in two energy bands: 0.2 - 1 keV ("soft") and 1 - 10 keV ("hard"). They detected 24 soft sources and 85 hard sources. Seven of the sources appear in both bands, where the criterion for a match between the bands is a positional offset of < 2.5 arcseconds. Thus, the total number of distinct X-ray sources detected (and listed in this table) is 102.


Catalog Bibcode

2005ApJ...626..272P

References

X-rays from Cepheus A East and West.
    Pravdo S.H., Tsuboi Y.
   <Astrophys. J., 626, 272-282 (2005)>
   =2005ApJ...626..272P    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in July 2007 based on the CDS Catalog J/ApJ/626/272 file table2.dat.

Parameters

Name
The name of the X-ray source using the 'XMMPT J' prefix (for XMM-Newton, Pravdo and Tsuboi) and the source position in J2000.0 coordinates truncated to 0.1 seconds of time in RA and 1 arcsecond in Declination, as pre-registered with the CDS Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the X-ray source in the selected equinox. This was given in J2000.0 decimal degree coordinates to a precision of 10^-4 degrees (0.26 arseconds) in Table 2 of the reference paper.

Dec
The Declination of the X-ray source in the selected equinox. This was given in J2000.0 decimal degree coordinates to a precision of 10^-4 degrees (0.26 arseconds) in Table 2 of the reference paper.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

SNR
The significance of the X-ray source detection, in sigma.

SB_Count_Rate
The soft-band (0.2 - 1 keV) count rate of the X-ray source, in counts per second.

HB_Count_Rate
The hard-band (1 -10 keV) count rate of the X-ray source, in counts per second. The criterion for a match between the soft and hard X-ray source is a positional offset of < 2.5 arcseconds.

USNOB1_Name
The numerical part of the USNO-B1.0 name of the optical counterpart to the X-ray source. The criterion for a match between the X-ray source and the catalog source is a positional offset of < 2.5 arcseconds.

Bmag
The USNO-B1.0 B magnitude of the optical counterpart to the X-ray source.

Rmag
The USNO-B1.0 R magnitude of the optical counterpart to the X-ray source.

Imag
The USNO-B1.0 I magnitude of the optical counterpart to the X-ray source.

TwoMASS_Name
The numerical part of the 2MASS name of the near-infrared counterpart to the X-ray source. The criterion for a match between the X-ray source and the catalog source is a positional offset of < 2.5 arcseconds.

Jmag
The 2MASS J magnitude of the near-infrared counterpart to the X-ray source.

Hmag
The 2MASS H magnitude of the near-infrared counterpart to the X-ray source.

Ks_Mag
The 2MASS K_s magnitude of the near-infrared counterpart to the X-ray source.

Alt_Name
An alternate name for the X-ray source and/or its optical or near-infrared counterpart. X1 and X2 are the names given in the reference paper to the 2 soft X-ray sources lieing within HH 168, while HWX is the name adopted for the hard X-ray source XMMPT J225618.4+620147 which is located near the center of the radio activity in Cep A East. The objects labelled HL NN, are from Hartigan and Lada (1985, ApJS, 59, 383) while those labelled RXH and WGA refer to X-ray sources previously detected by the ROSAT HRI and PSPC detectors, respectively.


Contact Person

Questions regarding the CEPAXMM 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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