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J/ApJS/106/463 SiO maser sources (Jiang+ 1996)
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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
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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:
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FileName Lrecl Records Explanations
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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
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Byte-per-byte Description of file: table1a table2a
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Bytes Format Units Label Explanations
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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
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Note (1): Gaussian components for SiO v = 1 J = 1-0 line.
Note (2): Gaussian components for SiO v = 2 J = 1-0 line.
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Byte-per-byte Description of file: table3
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Bytes Format Units Label Explanations
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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
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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>
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Origin: AAS CD-ROM series, Volume 7, 1996 Lee Brotzman [ADS] 09-Nov-96
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(End) Patricia Bauer [CDS] 03-Feb-1997