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COLL69OID - Collinder 69 Cluster Optical/IR Counterparts to XMM-Newton X-Ray Point Sources

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Overview

This table contains some of the results from the first paper of a series devoted to the Lambda Orionis star-forming region, Orion's Head, from the X-ray perspective. The final aim of this research is to provide a comprehensive view of this complex region, which includes several distinct associations and dark clouds. The authors aim to uncover the population of the central, young star cluster Collinder 69, and in particular to find those diskless Class III pre-main sequence objects which have not been identified by previous surveys based on near- and mid-infrared searches, and to establish the X-ray luminosity function for the association.

The authors have combined two exposures taken with the XMM-Newton satellite with an exhaustive data set of optical, near- and mid-infrared photometry to assess the membership of the X-ray sources based on different color-color and color-magnitude diagrams, as well as other properties, such as effective temperatures, masses and bolometric luminosities derived from spectral energy distribution fitting and comparison with theoretical isochrones. The presence of circumstellar disks is discussed using mid-infrared photometry from the Spitzer Space Telescope.

The authors searched for optical and IR counterparts for their X-ray detections, using a radius of 5.1 arcseconds. This search radius is motivated by the astrometry of XMM-Newton (~ 1-2 arcsec) and the statistical errors of the X-ray sources (<= 4 arcsecs). Multiple counterparts were found for several X-ray sources within their search radius. The visual inspection of all optical and IR images indicated that in a few cases there were additional possible counterparts even slightly beyond this search radius. In order to be as comprehensive as possible, the authors have also retained them. They compiled a master catalog with all sources that were present in at least one of the mappings (optical, near-IR or mid-IR) and extracted the photometry from these surveys. The photometry of all possible counterparts to X-ray sources is listed in this table.

The reference sources for the optical and infrared magnitudes are discussed in Section 3 of the reference paper. In this table, they are coded as follows:

Code   Reference Source

   1 = 2MASS Catalog, CDS Cat. II/246
   2 = XMM-Newton Optical Monitor (XMM OM)
   3 = Spitzer
   4 = Omega 2000 Camera photometry in 2005
   5 = CFHT1999 Survey
   6 = Barrado y Navascues et al. (2004 ApJ, 610, 1064; 2007 ApJ, 664, 481)
   7 = Dolan & Mathieu (1999 AJ, 118, 2409; 2001 AJ, 121, 2124)
   8 = Dolan & Mathieu (2002 AJ, 123, 387)
   9 = Omega 2000 Camera photometry in 2007
Thus, this table contains optical and infrared data, as well as membership information, on 205 possible counterparts to the 164 XMM-Newton X-ray sources detected in EPIC observations of the Collinder 69, East and West Fields (C69E and C69W), respectively, with maximum likelihood (ML) values > 15.0. A companion HEASARC Browse table COLL69XMM contains the X-ray data for these X-ray sources.

Catalog Bibcode

2011A&A...526A..21B

References

 XMM-Newton investigations of the {lambda} Orionis star-forming region (XILO).
I. The young cluster Collinder 69.
    Barrado D., Stelzer B., Morales-Calderon M., Bayo A., Huelamo N.,
    Stauffer J.R., Hodgkin S., Galindo F., Verdugo E.
   <Astron. Astrophys., 526, A21 (2011)>
   =2011A&A...526A..21B

Provenance

This table was created by the HEASARC in July 2011 based on the electronic versions of Tables 5, 6, 8 and 9 from the reference paper which were obtained from the CDS (their catalog J/A+A/526/A21 files table5.dat, table6.dat, table8.dat and table9.dat).

Parameters

Name
The counterpart designation (C69-X-eNNN(*) or C69-X-wNNN(*)) adopted by the authors in their paper, e.g., 'C69-X-e030' or 'C69-X-w032c' for X-ray sources in the Collinder 69, East and West Fields (C69E and C69W), respectively, where NNN is a unique identification number for each field. For cases with either no or a single counterpart, the name of the counterpart is the same as that of the X-ray source. When there is ambiguity in the optical or IR identification, these possibilities were identified, after visual inspection, by a letter suffix added to the name string denoting whether the optical or IR source is close to the center of the X-ray error box ('c'), or south ('s'), north ('n'), west ('w') or east ('e'). There is one source ('C69-X-w032z') with a letter suffix of 'z' the significance of which is not known (at least to the HEASARC).

RA
The Right Ascension of the optical and/or IR counterpart to the X-ray source, or of the X-ray source itself if no counterpart was identified, in the selected equinox. This was given in J2000.0 decimal degrees in the original table to a precsion of 10-6 degrees.

Dec
The Declination of the optical and/or IR counterpart to the X-ray source, or of the X-ray source itself if no counterpart was identified, in the selected equinox. This was given in J2000.0 decimal degrees in the original table to a precsion of 10-7 degrees.

LII
The Galactic Longitude of the optical and/or IR counterpart to the X-ray source, or of the X-ray source itself if no counterpart was identified.

BII
The Galactic Latitude of the optical and/or IR counterpart to the X-ray source, or of the X-ray source itself if no counterpart was identified.

Bmag
The Johnson B magnitude of the counterpart to the X-ray source.

Bmag_Error
The RMS uncertainty in the corresponding magnitude.

Vmag
The Johnson V magnitude of the counterpart to the X-ray source.

Vmag_Error
The RMS uncertainty in the corresponding magnitude.

Rc_Mag
The Cousins Rc magnitude of the counterpart to the X-ray source.

Rc_Mag_Error
The RMS uncertainty in the corresponding magnitude.

Ic_Mag
The Cousins Ic magnitude of the counterpart to the X-ray source.

Ic_Mag_Error
The RMS uncertainty in the corresponding magnitude.

Jmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is an upper limit rather than a detection.

Jmag
The Johnson J magnitude of the counterpart to the X-ray source.

Jmag_Error
The RMS uncertainty in the corresponding magnitude.

Hmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is an upper limit rather than a detection.

Hmag
The Johnson H magnitude of the counterpart to the X-ray source.

Hmag_Error
The RMS uncertainty in the corresponding magnitude.

Kmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is an upper limit rather than a detection.

Kmag
The Johnson K magnitude of the counterpart to the X-ray source.

Kmag_Error
The RMS uncertainty in the corresponding magnitude.

IRAC_3p6_um_Mag
The Spitzer/IRAC 3.6-um magnitude of the counterpart to the X-ray source.

IRAC_3p6_um_Mag_Error
The RMS uncertainty in the corresponding magnitude.

IRAC_4p5_um_Mag
The Spitzer/IRAC 4.5-um magnitude of the counterpart to the X-ray source.

IRAC_4p5_um_Mag_Error
The RMS uncertainty in the corresponding magnitude.

IRAC_5p8_um_Mag
The Spitzer/IRAC 5.8-um magnitude of the counterpart to the X-ray source.

IRAC_5p8_um_Mag_Error
The RMS uncertainty in the corresponding magnitude.

IRAC_8p0_um_Mag
The Spitzer/IRAC 8.0-um magnitude of the counterpart to the X-ray source.

IRAC_8p0_um_Mag_Error
The RMS uncertainty in the corresponding magnitude.

MIPS_24_um_Mag
The Spitzer/MIPS 24-um magnitude of the counterpart to the X-ray source.

MIPS_24_um_Mag_Error
The RMS uncertainty in the corresponding magnitude.

Ref_Bmag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Vmag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Rc_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Ic_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Jmag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Hmag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Kmag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_IRAC_3p6_um_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_IRAC_4p5_um_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_IRAC_5p8_um_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_IRAC_8p0_um_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

Ref_Mips_24_um_Mag
The code for the reference source for the corresponding magnitude. The key to the reference codes is given in the Overview Section (see above).

QSO_Flag
This parameter flags whether the object is likely to be a contaminating quasar. 'Yes' stands for objects located in the area of the color-color diagram of I-J versus J-[3.6] where quasars are located, after Bouy et al. (2009, A&A, 504, 199) [also, see Fig. 6 of the reference paper], 'Pos' for possible quasars, 'No' for non-quasars, and '?' for cases where no decision on this point could be made.

HRD_Member_Flag
This parameter flags whether the object is likely to be a cluster member based on its position in the H-R Diagram (see Fig. 7 of the reference paper: possible values are 'Y' for probable member, 'Y?' for possible member, 'N' for probable non-member, 'N?' for possible non-member, and '-' for no determination.

CMD_Member_Flag
This parameter flags whether the object is likely to be a cluster member based on its position in 5 color-magnitude diagrams (the first 5 panes in Fig. 8 of the reference paper): possible values are 'Y' for probable member, 'N' for probable non-member, '?' for uncertain cases, and '-' for no determination.

CCD_Member_Flag
This parameter flags whether the object is likely to be a cluster member based on its position in the [3.6]-[4.5] vs. [4.5]-[8.0] color-color diagram (the last pane in Fig. 8 of the reference paper): possible values are 'Y' for probable member, 'N' for probable non-member, '?' for uncertain cases, and '-' for no determination.

Final_Member_Flag
The final membership assigment of the object, as follows:

      Y   = Probable member
      Yco = Companion to probable member which also fulfils some membership
            criteria
      Y?  = Possible member
      NM? = Possible non-member
      NM  = Probable non-member
      ?co = Companion to probable member which is too close and faint
            compared to it to be able to say anything more
      noD = noData
  

Disk_Class
This parameter flags whether the object has an infrared spectral energy distribution (SED) of a Class I object (a protostar with an increasing slope in the SED towards longer wavelengths), a Class II object with an obvious IR excess (a classical T Tauri star with a disk), an object intermediate between Classes I and II (designated as I/II), or a Class III object (weak-lined T Tauri star with a black-bdy SED indicating the lack of a significant disk), based on its position in the Spitzer IRAC color-color diagram (see Lada 1987, IAUS, 115, 1) and Allen et al. (2004, ApJS, 154, 363) for details on this classification scheme.

ByN_Id_Number
The Barrado y Navascues et al. (2004, ApJ, 610, 1064) identification number (LOri-CFHT NN) of the counterpart to the X-ray source.

DM99_Id_Number
The Dolan & Mathieu (1999, AJ, 118, 2409; 2001, AJ, 121, 2124) identification number of the counterpart to the X-ray source.

USNO_A2_Name
The USNO-A2 (CDS Cat. I/252) designation of the counterpart to the X-ray source.

Sacco_Member_Flag
This parameter flags whether this object was considered to be a member or non-member [YN?-] by Sacco et al. (2008, A&A, 488, 167).

Spect_Type
The MK spectral type of the object (from Sacco et al. 2008, A&A, 488, 167).

Xray_Name
The X-ray source designation (C69-X-eNNN or C69-X-wNNN) adopted by the authors in their paper, e.g., 'C69-X-e062' or 'C69-X-w052' for X-ray sources in the Collinder 69, East and West Fields (C69E and C69W), respectively, where NNN is a unique identification number for each field. For cases where there is either no or a single counterpart for the X-ray source, the name of the X-ray source is the same as that of the counterpart.


Contact Person

Questions regarding the COLL69OID database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 13-Jul-2011