ACDS V10.0 - Detailed Description of II/293

ACDS V10.0 - Mon Jan 20 09:02:53 CET 2025

| # Detailed Description of II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008) |

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.

    II/293           GLIMPSE Source Catalog (I + II + 3D)     (IPAC 2008)
    ================================================================================
    Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE)
         Spitzer Science Center
        <IPAC, Caltech (2008)>
        =2009yCat.2293....0S
    ================================================================================
    ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys ; Milky Way

    Mission_Name: Spitzer

    Description:
        The Galactic Legacy Infrared Midplane Survey Extraordinaire (GLIMPSE),
        is a survey of Galactic Plane central parts made with the Infrared
        Array Camera (IRAC) aboard the Spitzer Space Telescope (SST). It
        covers approximately 220 square degrees, between galactic longitudes
        ±65° and ±1° in galactic latitude (up to 4.2° in the
        central parts). The four IRAC bands are centered at approximately
        3.6, 4.5, 5.8 and 8.0µm.

        The GLIMPSE combines the 3 surveys:
        * GLIMPSE-I covers the longitude ranges |l|=10--65° and the
          latitude range |b|<=1° (Benjamin et al. 2003PASP..115..953B)
        * GLIMPSE-II covers the longitude range of |l|<=10°, and a
          latitude range |b|<=1° from |l|=5--10, |b|<=1.5 for |l|=2--5,
          and |b|<=2° for |l|<=2. GLIMPSE-II coverage excludes the
          Galactic center region |l|<=1, |b|<=0.75 observed by the GALCEN
          GO program (PID=3677).
        * GLIMPSE-3D adds vertical extensions up to |b|=4.2° near the
          galactic center, and up to |b|=3° in selected other parts
          of the Galaxy (±10, 18.5, 25, 30, and -15 (345)°).

        GLIMPSE-II had two-epoch coverage for a total of three visits on the
        sky. The observations consisted of two 1.2 second integrations at each
        position in the first epoch of data taking (September 2005) and a
        single 1.2 second integration at each position six months later
        (April 2006).

        The highly reliable v2.0 GLIMPSEII Catalog (v2.0_GLMIIC) consists of
        point sources that are detected at least twice in one band and at
        least once in an adjacent band and a S/N > 5 cut for the band with the
        two detections. There are also faint and bright flux limits on the
        Catalog entries. The more complete v2.0 Archive (v2.0_GLMIIA) has less
        stringent criteria, namely two detections in any bands, those
        detections having a S/N > 5. The IRAC data were bandmerged with the
        2MASS All-Sky Point Source Catalog. See the GLIMPSEII v2.0 Data
        Products & Data Delivery document for more details.

        The catalog available from CDS merges the 3 surveys GLIMPSE-I (v2.0),
        GLIMPSE-II (v2.0), and GLIMPSE-3D; Catalog and Archive records are
        also merged here. In the regions of overlap between the 3 surveys
        (e.g. longitude around 10°) preference was given to
        (1) GLIMPSE-II, as recommended in the GLIMPSE documents of May 2007
        (glimpse1_v2.0.pdf) and April 2008 (glimpse2-v2.0.pdf);
        (2) GLIMPSE-I, and (3) GLIMPSE-3D sources. Sources from different
        surveys were merged if their position is closer than 0.1arcsec.

        Documents and a document describing in detail the point source
        photometry steps, see http://www.astro.wisc.edu/glimpse/docs.html

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × glimpse.sam      578     1000   Sample of GLIMPSE sources in Galactic Center

    See also:
        II/246 :  2MASS All-Sky Catalog of Point Sources (2MASS-C) (Cutri+ 2003)
        http://irsa.ipac.caltech.edu/data/SPITZER/GLIMPSE : GLIMPSE home page
        http://data.spitzer.caltech.edu/ : Access to Spitzer data

    Byte-by-byte Description of file:  glimpse.sam

       Bytes Format Units   Label    Explanations

       1- 17  A17   ---     GLIMPSE  [G+.0-9-] Source name (GLLL.llll+BB.bbbb)
      19- 28  F10.6 deg     RAdeg    Right ascension J2000, degrees
      30- 39  F10.6 deg     DEdeg    Declination J2000, degrees
          41  I1    ---     S        [123] Survey: 1=GLIMPSE-I, 2=GLIMPSE-II, and
                                      3=GLIPMSE-3D
          43  A1    ---     C        [CA] High-reliability sources are marked 'C'
                                      (Catalog part, with S/N>5).
      45- 60  A16   ---     2MASS    2MASS-PSC name JHHMMSSss+DDMMSSs (Cat. II/246)
          62  A1    ---     m_2MASS  Multiplicity on 2MASS name (in 3D survey only)
      64- 73  I10   ---     2Mkey    ? Unique source identifier (Cntr) in 2MASS
      75- 84  F10.6 deg     Glon     Galactic longitude of source
      86- 94  F9.6  deg     Glat     Galactic latitude of source
      96- 98  F3.1  arcsec  e_Glon   error in Galactic longitude
     100-102  F3.1  arcsec  e_Glat   error in Galactic latitude
     104-106  F3.1  arcsec  e_RAdeg  error in Right ascension
     108-110  F3.1  arcsec  e_DEdeg  error in Declination
         112  I1    ---     csf      [0/6] close source flag (1)
     114-119  F6.3  mag     Jmag     ? 2MASS-PSC J-band magnitude (1.25um)
     121-125  F5.3  mag     e_Jmag   ? 1-{sigma} error on Jmag
     127-132  F6.3  mag     Hmag     ? 2MASS-PSC H-band magnitude (1.65um)
     134-138  F5.3  mag     e_Hmag   ? 1-{sigma} error on Hmag
     140-145  F6.3  mag     Kmag     ? 2MASS-PSC Ks-band magnitude (2.17um)
     147-151  F5.3  mag     e_Kmag   ? 1-{sigma} error on Ksmag
     153-158  F6.3  mag     3.6mag   ? 3.6um IRAC (Band 1) magnitude
     160-164  F5.3  mag    e_3.6mag  ? 1-{sigma} error on 3.6mag
     166-171  F6.3  mag     4.5mag   ? 4.5um IRAC (Band 2) magnitude
     173-177  F5.3  mag    e_4.5mag  ? 1-{sigma} error on 4.5mag
     179-184  F6.3  mag     5.8mag   ? 5.8um IRAC (Band 1) magnitude
     186-190  F5.3  mag    e_5.8mag  ? 1-{sigma} error on 5.8mag
     192-197  F6.3  mag     8.0mag   ? 8.0um IRAC (Band 1) magnitude
     199-203  F5.3  mag    e_8.0mag  ? 1-{sigma} error on 8.0mag
     205-212  E8.3  mJy     F(J)     ? 2MASS-PSC J-band flux (1.25um)
     214-221  E8.3  mJy     e_F(J)   ? 1-{sigma} error on F(J)
     223-230  E8.3  mJy     F(H)     ? 2MASS-PSC H-band flux (1.65um)
     232-239  E8.3  mJy     e_F(H)   ? 1-{sigma} error on F(H)
     241-248  E8.3  mJy     F(Ks)    ? 2MASS-PSC Ks-band flux (2.17um)
     250-257  E8.3  mJy     e_F(Ks)  ? 1-{sigma} error on F(Ks)
     259-266  E8.3  mJy     F(3.6)   ? 3.6um IRAC (Band 1) flux
     268-275  E8.3  mJy    e_F(3.6)  ? 1-{sigma} error on F(3.6)
     277-284  E8.3  mJy     F(4.5)   ? 4.5um IRAC (Band 2) flux
     286-293  E8.3  mJy    e_F(4.5)  ? 1-{sigma} error on F(4.5)
     295-302  E8.3  mJy     F(5.8)   ? 5.8um IRAC (Band 3) flux
     304-311  E8.3  mJy    e_F(5.8)  ? 1-{sigma} error on F(5.8)
     313-320  E8.3  mJy     F(8.0)   ? 8.0um IRAC (Band 4) flux
     322-329  E8.3  mJy    e_F(8.0)  ? 1-{sigma} error on F(8.0)
     331-339  E9.3  mJy    rms(3.6)  ? rms deviation from final 3.6um flux (2)
     341-349  E9.3  mJy    rms(4.5)  ? rms deviation from final 4.5um flux (2)
     351-359  E9.3  mJy    rms(5.8)  ? rms deviation from final 5.38m flux (2)
     361-369  E9.3  mJy    rms(8.0)  ? rms deviation from final 8.0um flux (2)
     371-379  E9.3  MJy/sr sky(3.6)  ? Local sky background at 3.6um
     381-389  E9.3  MJy/sr sky(4.5)  ? Local sky background at 4.5um
     391-399  E9.3  MJy/sr sky(5.8)  ? Local sky background at 5.8um
     401-409  E9.3  MJy/sr sky(8.0)  ? Local sky background at 8.0um
     411-415  F5.2  ---     Jsn      ? 2MASS-PSC J-band Signal/Noise ratio
     417-421  F5.2  ---     Hsn      ? 2MASS-PSC H-band Signal/Noise ratio
     423-427  F5.2  ---     Ksn      ? 2MASS-PSC Ks-band Signal/Noise ratio
     429-433  F5.2  ---     3.6sn    ? IRAC 3.6um band Signal/Noise
     435-439  F5.2  ---     4.5sn    ? IRAC 4.5um band Signal/Noise
     441-445  F5.2  ---     5.8sn    ? IRAC 5.8um band Signal/Noise
     447-452  F6.2  ---     8.0sn    ? IRAC 8.0um band Signal/Noise
     454-458  F5.1 arcmin-2 d(3.6)   ? Local source density at 3.6um
     460-464  F5.1 arcmin-2 d(4.5)   ? Local source density at 4.5um
     466-470  F5.1 arcmin-2 d(5.8)   ? Local source density at 5.8um
     472-475  F4.1 arcmin-2 d(8.0)   ? Local source density at 8.0um
     477-478  I2    ---     N(3.6)   ? Number of detections in 3.6um IRAC band
     480-481  I2    ---     N(4.5)   ? Number of detections in 4.5um IRAC band
     483-484  I2    ---     N(5.8)   ? Number of detections in 5.8um IRAC band
     486-487  I2    ---     N(8.0)   ? Number of detections in 8.0um IRAC band
     489-490  I2    ---     n(3.6)   ? Number of possible detections in 3.6um band
     492-493  I2    ---     n(4.5)   ? Number of possible detections in 4.5um band
     495-496  I2    ---     n(5.8)   ? Number of possible detections in 5.8um band
     498-499  I2    ---     n(8.0)   ? Number of possible detections in 8.0um band
     501-508  A8    ---     q_Jmag   ? [0-9a-f] 2MASS-PSC Quality Flag (3)
     510-517  A8    ---     q_Hmag   ? [0-9a-f] 2MASS-PSC Quality Flag (3)
     519-526  A8    ---     q_Kmag   ? [0-9a-f] 2MASS-PSC Quality Flag (3)
     528-535  A8    ---    q_3.6mag  ? [0-9a-f] 3.6um IRAC Quality Flag (3)
     537-544  A8    ---    q_4.5mag  ? [0-9a-f] 4.5um IRAC Quality Flag (3)
     546-553  A8    ---    q_5.8mag  ? [0-9a-f] 5.8um IRAC Quality Flag (3)
     555-562  A8    ---    q_8.0mag  ? [0-9a-f] 8.0um IRAC Quality Flag (3)
     564-566  A3    ---     m(3.6)   ? [0-9a-f] Method used for 3.6um flux (4)
     568-570  A3    ---     m(4.5)   ? [0-9a-f] Method used for 4.5um flux (4)
     572-574  A3    ---     m(5.8)   ? [0-9a-f] Method used for 5.8um flux (4)
     576-578  A3    ---     m(8.0)   ? [0-9a-f] Method used for 8.0um flux (4)

    Note (1): The close source flag  is set if there are Archive sources that
         are within 3arcsec of the source:
       0 = no Archive source within 3.0" of source
       1 = Archive sources between 2.5" and 3.0" of source
       2 = Archive sources between 2.0" and 2.5" of source
       3 = Archive sources between 1.5" and 2.0" of source
       4 = Archive sources between 1.0" and 1.5" of source
       5 = Archive sources between 0.5" and 1.0" of source
       6 = Archive sources within 0.5" of source
    Note (2): deviation of individual detections from final flux
        (large values may imply variability)
    Note (3): the quality flag, written here in hexadecimal, describes
         peculiarities which, if existing, contribute to 2b to the
         quality flag: for instance, the value '2400' (9216 in decimal,
         which is 210+213) means:
         * DAOPHOT tweak negative (210)
         * confusion in cross-band merge (213)
       --------------------------------------------------------------------------
        b  Explanation                                  Survey
       --------------------------------------------------------------------------
         0 poor pixels in dark current                  SSC pmask
         1 flat field questionable                      SSC dmask
         2 latent image (a)                             SSC dmask
         2 persistence (p)                              2MASS
         3 photometric confusion (c)                    2MASS
         6 muxbleed correction applied                  GLIMPSE
         7 hot, dead or otherwise unacceptable pixel    SSC pmask,dmask,GLIMPSE
         8 muxbleed correction applied is > 3 above bkg GLIMPSE
         8 electronic stripe (s)                        2MASS
         9 DAOPHOT tweak positive                       GLIMPSE
        10 DAOPHOT tweak negative                       GLIMPSE
        12 confusion in in-band merge                   GLIMPSE
        13 confusion in cross-band merge (IRAC)         GLIMPSE
        13 confusion in cross-band merge (2MASS)        GLIMPSE
        14 column pulldown corrected                    GLIMPSE
        15 banding corrected                            GLIMPSE
        16 stray light                                  GLIMPSE
        18 data predicted to saturate                   GLIMPSE
        19 saturated star wing region                   GLIMPSE
        19 diffraction spike (d)                        2MASS
        20 pre-lumping in in-band merge                 GLIMPSE
        21 post-lumping in cross-band merge             GLIMPSE
        21 post-lumping in cross-band merge             2MASS
        22 photometric quality flag (*)                 2MASS
        23 photometric quality flag (*)                 2MASS
        24 photometric quality flag (*)                 2MASS
        29 within three pixels of edge of frame         GLIMPSE
        31 flux in Archive but not in Catalog entry     GLIMPSE (added at CDS)
       --------------------------------------------------------------------------
        (a) Due to the short exposure time and high sky backgrounds in the
            GLIMPSEII fields, we have not seen evidence for latent sources
            in the images, even though they are flagged via an automatic
            algorithm in SSC's processing.
        (*) the 2MASS quality is stored here on 3 bits, with
            A (best): all three flags set to 1 (.1c..... in hexa)
            B (2nd) : bit pattern 110          (.18..... in hexa)
            C (3rd) : bit pattern 101          (.14..... in hexa)
            D (4th) : bit pattern 100          (.10..... in hexa)
            E (5th) : bit pattern 011          (.0c..... in hexa)
            F (6th) : bit pattern 010          (.04..... in hexa)
       --------------------------------------------------------------------------
    Note (4): the method flag, written here in hexadecimal, describes
        the combination of the existence and usage of the frames:
         0 = Frame 0.6s present
         1 = Frame 0.6s present and used
         2 = Frame 1.2s present
         3 = Frame 1.2s used for flux calculation
         4 = Frame 2s present
         5 = Frame 2s  used for flux calculation
         6 = Frame 12s present
         7 = Frame 12s  used for flux calculation
         8 = Frame 30s present
         9 = Frame 30s  used for flux calculation
        10 = Frame 100s present
        11 = Frame 100s  used for flux calculation

    Nomenclature Notes:
       It is recommended to use the GPSC for the sources of GLIMPSE Catalog
       (at least 2 detections with S/N>=5), and GPSA (Archive) for those not
       meeting these criteria.
       Objects in SIMBAD are <SSTGLMC GLLL.llll+BB.bbbb> (for catalog sources;
       "C" in column C (S/N>5)) or <SSTGLMA GLLL.llll+BB.bbbb> (for archive sources;
       "A" in column C).

    History:
      * 30-Aug-2024: format migration (CDS)
    ================================================================================
    (End)                                   Francois Ochsenbein [CDS]    12-Jun-2009