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J/ApJS/106/463            SiO maser sources                     (Jiang+ 1996)
SiO maser sources in the outer disk of the Galaxy
     Jiang B.W., Deguchi S., Yamamura I., Nakada Y., Cho S.H., Yamagata T.
    <Astrophys. J. Suppl. Ser. 106, 463 (1996)>
    =1996ApJS..106..463J
ADC_Keywords: Infrared sources ; Masers ; Photometry, infrared

Keywords: Galaxy: kinematics and dynamics - ISM: molecules - masers -
          stars: variables: other (long-period variables)

Abstract:
    The observations in the 28SiO J=1-0 v=1, J=1-0 v=2 lines and the 29SiO
    J=1-0, v=0 lines were simultaneously made toward 181 color-selected
    IRAS sources in the outer disk of the Galaxy (at longitudes between 90
    deg and 250 deg). The 28SiO lines were detected in 63 sources (56 new)
    and the 29SiO line in 11 sources (9 new). Most of the detections are
    optically variable stars, mainly Mira-type variables and a few
    semiregular variables. The detection rate (35%) is much lower than
    that of the bulge survey performed by the same observational system -
    the 45m telescope at Nobeyama Radio Observatory. The lower detection
    rate of SiO maser emission is partly attributed to the increase of
    contaminations by stars with C-rich circumstellar envelopes and young
    stellar objects in the outer disk sample. The kinematical implications
    of the observational results are also discussed. The luminosity
    distances to the SiO maser sources are estimated from their IRAS
    fluxes at 12um and colors. By combining the SiO radial velocity and
    the luminosity distance, the rotation curve of the outer Galactic disk
    is found to be slightly falling within the Galactocentric distance
    between 8.5 and 12kpc. The sources located within 20deg from the
    Galactic anticenter direction are used to check for a peculiar motion
    of the local standard of rest.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1a           74      123   Line parameters of Gaussian components of the
                                 v=1 and v=2 detections
table2a           74       46   Line parameters of Gaussian components of the
                                 29SiO detections
table3           103      117   Infrared properties and observation parameters
                                 of the nondetections
tables.tex       120      357   LaTeX version of the tables


Byte-by-byte Description of file: table1a table2a

   Bytes Format  Units     Label    Explanations

   1- 10  A10    ---       IRAS     IRAS PSC (Cat. II/125) name
  12- 17  F6.3   K         TA1      ? Peak antenna temperature (1)
      18  A1     ---       n_TA1    [:] : when no data for TA1
  20- 24  F5.3   K         rms1     1 sigma noise level of line observation (1)
  26- 33  F8.3   km/s      Vlsr1    ? Velocity in Local Standard of Rest (1)
      34  A1     ---       n_Vlsr1  [:] : when no data for Vlsr1
  36- 41  F6.3   km/s      FWHM1    ? Full width at half maximum (1)
      42  A1     ---       n_FWHM1  [:] : when no data for FWHM1
  44- 49  F6.3   K         TA2      ? Peak antenna temperature (2)
      50  A1     ---       n_TA2    [:] : when no data for TA2
  52- 56  F5.3   K         rms2     1 sigma noise level of line observation (2)
  58- 65  F8.3   km/s      Vlsr2    ? Velocity in Local Standard of Rest (2)
      66  A1     ---       n_Vlsr2  [:] : when no data for Vlsr2
  68- 73  F6.3   km/s      FWHM2    ? Full width at half maximum (2)
      74  A1     ---       n_FWHM2  [:] : when no data for FWHM2

Note (1): Gaussian components for SiO v = 1 J = 1-0 line.

Note (2): Gaussian components for SiO v = 2 J = 1-0 line.



Byte-by-byte Description of file: table3

   Bytes Format  Units     Label    Explanations

   1- 10  A10    ---       IRAS     IRAS PSC (Cat. II/125) name
  12- 17  F6.1   deg       GLON     Galactic longitude
  19- 23  F5.1   deg       GLAT     Galactic latitude
  25- 31  F7.3   Jy        F12      IRAS flux at 12 microns
  33- 38  F6.2   ---       C12      IRAS color C12 (log F25/F12)
  40- 45  F6.2   ---       C23      IRAS color C23 (log F60/F25)
  47- 48  I2     ---       Var      IRAS variability index
  50- 52  I3     ---       LRS      []? IRAS Low Resolution Spectrum class
      54  I1     ---       Id       []? ID status; 1=identified; 0=unidentified
  56- 61  F6.3   K         rms1     1-sigma level for SiO maser v=1 line obs.
  63- 68  F6.3   K         rms2     1-sigma level for SiO maser v=2 line obs.
  70- 77  A8     ---       Date     Date of SiO maser observation, yymmddhh
  79-103  A25    ---       Other   *Result of obs. in other molecular lines

Note on Other:
  Results of observations in other molecular lines, '+' means
  positive result and '-' means negative, number in parentheses
  are reference numbers, as follows:
     1. te Lintel Hekkert et al., 1991A&AS...90..327T
     2. Le Sequeren et al., 1992A&A...254..133L
     3. Eder et al., 1988ApJS...66..183E
     4. Lewis et al., 1990ApJ...362..634L
     5. Chengalur et al., 1993ApJS...89..189C
     6. Lewis, 1994ApJS...93..549L
     7. Loup et al., 1993A&AS...99..291L
     8. Wouterlout et al., 1989A&AS...80..149W, Cat. J/A+AS/80/149
     9. Sivagnanam et al., 1990A&A...233..112S
    10. Galt et al., 1989AJ.....98.2182G
    11. Nyman et al., 1993A&A...280..551N
    12. Benson et al., 1990ApJS...74..911B, Cat. V/68
    13. Kastner et al., 1993A&A...275..163K, Cat. J/A+A/275/163


Origin: AAS CD-ROM series, Volume 7, 1996           Lee Brotzman [ADS] 09-Nov-96

(End)                                         Patricia Bauer  [CDS]  03-Feb-1997