ACDS V10.0 - Detailed Description of J/ApJ/701/508

ACDS V10.0 - Sun Jan 19 03:57:31 CET 2025

| # Detailed Description of J/ApJ/701/508 : 5000 AGNs behind the Magellanic clouds (Kozlowski+, 2009) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    J/ApJ/701/508      5000 AGNs behind the Magellanic clouds     (Kozlowski+, 2009)
    ================================================================================
    Discovery of 5000 active galactic nuclei behind the Magellanic Clouds.
        Kozlowski S., Kochanek C.S.
       <Astrophys. J., 701, 508-513 (2009)>
       =2009ApJ...701..508K
    ================================================================================
    ADC_Keywords: Active gal. nuclei ; Photometry, infrared ; Magellanic Clouds

    Keywords: cosmology: observations - galaxies: active - infrared: galaxies -
              quasars: general

    Abstract:
        We show that using mid-IR color selection to find active galactic
        nuclei (AGNs) is as effective in dense stellar fields such as the
        Magellanic Clouds as it is in extragalactic fields with low stellar
        densities using comparisons between the Spitzer Deep Wide Field Survey
        data for the NOAO Deep Wide Field Survey Bootes region and the SAGE
        Survey of the Large Magellanic Cloud. We use this to build high-purity
        catalogs of ~5000 AGN candidates behind the Magellanic Clouds. Once
        confirmed, these quasars will expand the available astrometric
        reference sources for the Clouds and the numbers of quasars with
        densely sampled, long-term (>decade) monitoring light curves by well
        over an order of magnitude and potentially identify sufficiently
        bright quasars for absorption line studies of the interstellar medium
        of the Clouds.

    Description:
        We combine results from studies of the extragalactic NOAO Deep Wide
        Field Survey (NDWFS; Jannuzi & Dey, 1999ASPC..191..111J) Bootes field
        based on the IRAC Shallow Survey (Eisenhardt et al.
        2004ApJS..154...48E), the Spitzer Deep Wide Field Survey (SDWFS; Ashby
        et al. 2009, Cat J/ApJ/701/428), and the AGN and Galaxy Evolution
        Survey (AGES; C. S. Kochanek et al. 2009, in prep) with the Spitzer
        SAGE Survey data (Meixner et al. 2006, Cat. J/AJ/132/2268) and
        OGLE-III optical survey (Udalski et al. 2008AcA....58...69U,
        2008AcA....58...89U, 2008AcA....58..329U) of the LMC to develop a
        simple method of selecting AGNs in these dense stellar fields.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table1.dat       176     4699   AGN candidates behind the Large Magellanic Cloud
    × table2.dat       176      657   AGN candidates behind the Small Magellanic Cloud

    See also:
      J/ApJ/716/530  : Mid-IR variability from the SDWFS (Kozlowski+, 2010)
      J/ApJ/701/428  : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)
      J/AJ/136/18    : LMC SAGE. New candidate YSOs (Whitney+, 2008)
      J/ApJ/655/212  : S3MC IRAC and MIPS photometry (Bolatto+, 2007)
      J/ApJ/641/140  : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)
      J/AJ/132/2268  : SAGE calibration stars (Meixner+, 2006)
      J/A+AS/142/41  : SMC X-ray sources ROSAT PSPC catalogue (Haberl+, 2000)
      J/A+AS/139/277 : LMC X-ray sources ROSAT PSPC catalogue (Haberl+, 1999)
      http://celestial.berkeley.edu/spitzer : S3MC (Spitzer Survey of the SMC) page
      http://irsa.ipac.caltech.edu/data/SPITZER/SAGE/  : SAGE data access
      http://irsa.ipac.caltech.edu/data/SPITZER/SDWFS/ : SDWFS data access

    Byte-by-byte Description of file:  table[12].dat

       Bytes Format Units   Label    Explanations

       1- 20  A20   ---     ID       Source identification (JHHMMSS.ss+DDMMSS.s)
                                     (see Nomenclature notes)
      22- 30  F9.6  deg     RAdeg    Right Ascension in decimal degrees (J2000)
      32- 41  F10.6 deg     DEdeg    Declination in decimal degrees (J2000)
      43- 48  F6.3  mag     [3.6]    ?=99.999 Spitzer/IRAC 3.6 micron band magnitude
      50- 54  F5.3  mag     e_[3.6]  ?=9.999 The 1{sigma} error in 3.6mag
      56- 61  F6.3  mag     [4.5]    ?=99.999 Spitzer/IRAC 4.5 micron band magnitude
      63- 67  F5.3  mag     e_[4.5]  ?=9.999 The 1{sigma} error in 4.5mag
      69- 74  F6.3  mag     [5.8]    ?=99.999 Spitzer/IRAC 5.8 micron band magnitude
      76- 80  F5.3  mag     e_[5.8]  ?=9.999 The 1{sigma} error in 5.8mag
      82- 87  F6.3  mag     [8.0]    ?=99.999 Spitzer/IRAC 8.0 micron band magnitude
      89- 93  F5.3  mag     e_[8.0]  ?=9.999 The 1{sigma} error in 8.0mag
      95-100  F6.3  mag     Vmag     ?=99.999 V band magnitude
     102-106  F5.3  mag     e_Vmag   ?=9.999 The 1{sigma} error in Vmag
     108-113  F6.3  mag     Imag     ?=99.999 I band magnitude
     115-119  F5.3  mag     e_Imag   ?=9.999 The 1{sigma} error in Imag
     121-135  A15   ---     OGLE     OGLE-III identification (smc/lmcFFF.F.NNNNNN;
                                     <OGLE {L/S}MCFFF.F NNNNNN> in Simbad)
     137-142  A6    ---     Type     Source type, from color-magnitude diagrams (1)
     144-148  F5.2  ---     z        ?=-1 Redshift
     150-176  A27   ---     r_z      Reference of z (2)

    Note (1): The classification scheme is QSO-[AB][0ab] or YSO-[AB][0ab]
         according to the location in color-magnitude diagrams: A and B for
         IRAC colors/magnitudes, a and b with the I color from OGLE-III;
         0 means that the source had no optical match (outside the OGLE-III
         regions or too faint). See section 2 of the paper for details.
    Note (2): In table 1, we indicate if the source is a known quasar if it is
         flagged as a "YSO" by Whitney et al. (2008, Cat. J/AJ/136/18), and if
         it is within the 90% confidence radius of a ROSAT source ("HP99",
         Haberl & Pietsch 1999, Cat. J/A+AS/139/277; <[HP99] NNNN> in Simbad).
         We estimate that 30% of the ROSAT identifications will be false
         positives. For the ROSAT sources we indicate the ROSAT catalog number
         using the format HP99_number. In table 2, if it is flagged as a "YSO"
         by Bolatto et al. (2007, Cat. J/ApJ/655/212) and if it is within the
         90% confidence radius of a ROSAT source (H00, Haberl et al. 2000, Cat.
         J/A+AS/142/41; <[HFP2000] NNN> in Simbad). For the ROSAT sources we
         indicate the ROSAT catalog number using format H00_number. A "-1"
         indicates no existing reference.

    Nomenclature notes:
        For table 1, sources are <[KK2009] SAGE JHHMMSS.ss+DDMMSS.s> and for
        table 2, sources are <SSTS3MC DD.dddd+DD.dddd> with truncated coordinates.

    History:
        From electronic version of the journal
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    (End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    07-Sep-2011