ACDS V10.0 - Detailed Description of II/327

ACDS V10.0 - Wed Jan 15 15:58:06 CET 2025

| # Detailed Description of II/327 : AKARI Far-Infrared Surveyor YSO catalog (Toth+, 2014) |

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/327              AKARI Far-Infrared Surveyor YSO catalog       (Toth+, 2014)
    ================================================================================
    The AKARI Far-Infrared Surveyor young stellar object catalog.
        Toth L.V., Marton G., Zahorecz S., Balazs L.G., Ueno M., Tamura M.,
        Kawamura A., Kiss Z.T., Kitamura Y.
       <Publ. Astron. Soc. Jap., 66, 17 (2014)>
       =2014PASJ...66...17T
       =2014yCat.2327....0T
    ================================================================================
    ADC_Keywords: Protostars ; Stars, pre-main sequence ; Stellar distribution ;
                  Fundamental catalog
    Keywords: catalogs - infrared: ISM - infrared: stars - ISM: bubbles -
              stars: formation

    Abstract:
        We demonstrate the use of the AKARI all-sky survey photometric data in
        the study of galactic star formation. Our aim was to select young
        stellar objects (YSOs) in the AKARI Far-Infrared Surveyor (FIS) Bright
        Source Catalogue. We used AKARI/FIS and Wide-field Infrared Survey
        Explorer (WISE) data to derive mid- and far-infrared colors of YSOs.
        Classification schemes based on quadratic discriminant analysis (QDA)
        have been given for YSOs and the training catalog for QDA was the
        whole-sky selection of previously known YSOs (i.e., listed in the
        SIMBAD database). A new catalog of AKARI FIS YSO candidates including
        44001 sources has been prepared; the reliability of the classification
        is over 90%, as tested in comparison to known YSOs. As much as 76% of
        our YSO candidates are from previously uncatalogued types. The vast
        majority of these sources are Class I and II types according to the
        Lada classification. The distribution of AKARI FIS YSOs is well
        correlated with that of the galactic ISM; local over-densities were
        found on infrared loops and towards the cold clumps detected by
        Planck.

    Description:
        AKARI FSC BSC data was combined with mid-IR photometric data from the
        WISE All-Sky Data Release. Classification was made with quadratic
        discriminant analysis based on the mid- and far-IR colours and
        brightness values. 44001 sources were classified as young stellar
        object candidate. For each candidate AKARI FIS ID, celestial position
        (RA2000, DEC2000), WISE magnitudes measured in passbands centered at
        3.4, 4.6, 12 and 22um (W1, W2, W3, W4), their corresponding errors
        (e_W1, e_W2, e_W3, e_W4), FIS flux densities measured in passbands
        with nominal wavelengths of 65, 90, 140 and 160um (F65, F90, F140,
        F160) and the corresponding flux qualities (F_QUAL), the probability
        of being YSO, SIMBAD main type and subtypes, the angular distance
        between the FIS source and the matching SIMBAD object and the SIMBAD
        ID of the matching object are listed.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × ysoc.dat         232    44001   Parameters of sources classified as YSO candidate

    See also:
        II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
        II/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)
        II/311 : WISE All-Sky Data Release (Cutri+ 2012)

    Byte-by-byte Description of file:  ysoc.dat

       Bytes Format Units   Label    Explanations

       1- 14  A14   ---     AKARI    ID number from the AKARI FIS BSC (Cat. II/298)
                                       (objName, HHMMSSs+DDMMSS)
      16- 25  F10.6 deg     RAdeg    Right ascension (J2000.0)
      27- 36  F10.6 deg     DEdeg    Declination (J2000.0)
      38- 43  F6.3  mag     W1       WISE W1 magnitude
      45- 49  F5.3  mag     e_W1     Error of W1 magnitude
      51- 56  F6.3  mag     W2       WISE W2 magnitude
      58- 62  F5.3  mag     e_W2     Error of W2 magnitude
      64- 69  F6.3  mag     W3       WISE W3 magnitude
      71- 75  F5.3  mag     e_W3     Error of W3 magnitude
      77- 82  F6.3  mag     W4       WISE W4 magnitude
      84- 88  F5.3  mag     e_W4     Error of W4 magnitude
      90-100  F11.6 Jy      F65      AKARI N60 flux density (65um)
     102-112  F11.6 Jy      F90      AKARI WIDE-S flux density (90um)
     114-124  F11.6 Jy      F140     AKARI WIDE-L flux density (140um)
     126-137  F12.6 Jy      F160     AKARI N160 flux density (160um)
         139  I1    ---     q_F65    [1/3] 65um flux quality value (3=high quality)
         141  I1    ---     q_F90    [3] 90um flux quality value (3=high quality)
         143  I1    ---     q_F140   [3] 140um flux quality value (3=high quality)
         145  I1    ---     q_F160   [1/3] 160um flux quality value (3=high quality)
     147-154  F8.6  ---     Prob     [0.5/1] Probability of being a YSO candidate
     156-158  A3    ---     Type     Main Type of the source as listed in SIMBAD (1)
     160-189  A30   ---    Subtypes  Subtypes of the source as listed in SIMBAD
     191-196  F6.3  arcsec  Dist     [0.1/30]?=0 Angular distance between the FIS
                                       source and the matching SIMBAD object
     198-232  A35   ---     SIMBAD   SIMBAD ID of the matching SIMBAD object

    Note (1): The classification was done in late 2012, the paper was submitted in
      early 2013, while the preparation of the final form of the catalog was
      made in mid 2013. Meanwhile 4 of our YSO candidate sources were classified
      as galaxy in the SIMBAD which we did not remove. But in this catalog they
      are already listed as galaxy in the Main Type column.

    Acknowledgements:
        Gabor Marton , marton.gabor(at)csfk.mta.hu
    ================================================================================
    (End)     Gabor Marton [Konkoly, Hungary], Patricia Vannier [CDS]    03-Jan-2014