J/A+A/474/891 13CO observations of YSOs in South Gal. plane (Urquhart+, 2007)
The RMS survey. 13CO observations of candidate massive YSOs in the southern
Galactic plane.
Urquhart J.S., Busfield A.L., Hoare M.G., Lumsden S.L., Oudmaijer R.D.,
Moore T.J.T., Gibb A.G., Purcell C.R., Burton M.G., Marechal L.J.L.
<Astron. Astrophys., 474, 891-901 (2007)>
=2007A&A...474..891U 2007A&A...474..891U
ADC_Keywords: YSOs ; Stars, pre-main sequence ; Radio lines
Keywords: stars: formation - stars: early-type - stars: pre-main sequence -
ISM: clouds - ISM: kinematics and dynamics
Abstract:
The Red MSX Source (RMS) survey is an ongoing multi-wavelength
observational programme designed to return a large, well-selected
sample of massive young stellar objects (MYSOs). We have identified
∼2000 MYSOs candidates located within our Galaxy by comparing the
colours of MSX and 2MASS point sources to those of known MYSOs. The
aim of our follow-up observations is to identify other contaminating
objects such as ultra compact (UC) HII regions, evolved stars and
planetary nebulae (PNe) and distinguish between genuine MYSOs and
nearby low-mass YSOs.
A critical part of our follow-up programme is to conduct 13CO
molecular line observations in order to determine kinematic distances
to all of our MYSO candidates. These distances will be used in
combination with far-IR and (sub)millimetre fluxes to determine
bolometric luminosities which will allow us to identify and remove
nearby low-mass YSOs. In addition these molecular line observations
will help in identifying evolved stars which are weak CO emitters.
We have used the 22m Mopra telescope, the 15m JCMT and the 20m
Onsala telescope to conduct molecular line observations towards 854
MYSOs candidates located in the 3rd and 4th quadrants. These
observations have been made at the J=1-0 (Mopra and Onsala) and J=2-1
(JCMT) rotational transition frequency of 13CO molecules and have a
spatial resolution of ∼20"-40", a sensitivity of TA*∼0.1K and a
velocity resolution of ∼0.2km/s.
Description:
MSX names, positions, observational rms values and molecular line
parameters obtained from Gaussian fits to all detected components made
towards the RMS sample of massive young stellar object candidates
located in the southern Galactic plane.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 156 2132 *Summary of the RMS sources observed, observed
positions, the rms noise levels of the reduced
spectra, line component parameters and Galactic
kinematic distances.
sp/* . 1504 Spectra in FITS and PNG
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Note on table3.dat: The line parameters have been obtained from Gaussian fits to
the data and the distances have been calculated using the Galactic rotation
curves of Brand and Blitz 1993, Cat. J/A+A/275/67.
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See also:
J/A+A/461/11 : Radio observations of MYSO candidates (Urquhart+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- MSX Field name (GLLL.llll+DD.dddd)
19- 26 F8.4 deg RAdeg Right ascension (J2000)
28- 35 F8.4 deg DEdeg Declination (J2000)
37 A1 --- Tel [JOM] Telescope symbol
(J)CMT, (O)nsala and (M)opra
39- 43 F5.3 K rms Spectra rms in units of TA*
45- 46 I2 --- Comp ?=- Component number
48 I1 --- Match [1]? Flag to identify line component associated
with RMS source
1=association, blank=unassociated
50- 55 F6.1 km/s VLSR ?=- Kinematic velocity
57- 60 F4.1 K TR ?=- Receiver temperature
62- 65 F4.1 km/s FWHM ?=- Line full width at half maximum
67- 71 F5.1 km/s.K TRdV ?=- Integrated emission
73- 98 A26 --- Profile ?=- Note on component profile
100-103 F4.1 kpc RGC ?=- Galactocentric distance of component
105-108 F4.1 kpc Near ?=- Near distance
110-113 F4.2 kpc e_Near ?=- Error in the near distance
115-118 F4.1 kpc Far ?=- Far distance
120-123 F4.2 kpc e_Far ?=- Error in the far distance
125-129 A5 --- Notes Notes on the method used to identify the
component associated with an RMS source (1)
131-156 A26 --- Radix Filename radix with the spectrum (2)
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Note (1): Methods as follows:
1 = strongest component
2 = methanol maser
3 = water maser
4 = CS detection by Bronfman et al., 1996, Cat. J/A+AS/115/81
5 = Fontani et al., 2005, Cat. J/A+A/432/921
Note (2): only the file radix is given in this column; the extension
".fits" should be added for the FITS version, or ".png" for the
image. The files are in the "sp" subdirectory.
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Acknowledgements:
James Urquhart, jsu(at)ast.leeds.ac.uk
(End) Patricia Vannier [CDS] 20-Dec-2007