J/A+A/527/A41 NH3 observations in outflows (Sepulveda+, 2011)
Dense gas and the nature of the outflows.
Sepulveda I., Anglada G., Estalella R., Lopez R., Girart J.M., Yang J.
<Astron. Astrophys. 527, A41 (2011)>
=2011A&A...527A..41S 2011A&A...527A..41S
ADC_Keywords: Interstellar medium
Keywords: ISM: jets and outflows - ISM: molecules - stars: formation
Abstract:
We present the results of the observations of the (J,K)=(1,1) and the
(J,K)=(2,2) inversion transitions of the NH3 molecule towards a large
sample of 40 regions with molecular or optical outflows, using the 37m
radio telescope of the Haystack Observatory. We detected NH3 emission
in 27 of the observed regions and we mapped this emission in 25 of
them. Additionally, we searched for the 616-523 H2O maser line
towards six regions, detecting H2O maser emission in two of them. We
estimate the physical parameters of the regions mapped in NH3 and, for
each particular region, we analyze the distribution of high density
gas and its relationship with the presence of young stellar objects
We confirm with a larger sample of regions that the NH3 line emission
is more intense towards molecular outflow sources than towards sources
with optical outflow, suggesting a possible evolutionary scheme in
which young stellar objects associated with molecular outflows lose
progressively their neighboring high-density gas, weakening both the
NH3 emission and the molecular outflow in the process, and making
optical jets more easily detectable as the total amount of gas
decreases.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
nh3_11.dat 83 27 List of files with NH3(1,1) data
nh3_22.dat 83 10 List of files with NH3(2,2) data
h2o_mas.dat 72 2 List of files with H2O maser data
nh3_11/* . 27 NH3(1,1) CLASS data files
nh3_22/* . 27 NH3(2,2) CLASS data files
h2o_mas/* . 2 616-523 H2O maser CLASS data files
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See also:
J/ApJ/463/205 : CS and NH3 Survey of H2O Maser Emission (Anglada+ 1996)
J/A+A/461/197 : VLA NH3 observations of 5 IRAS sources (Wang+, 2007)
Byte-by-byte Description of file: nh3_11.dat nh3_22.dat h2o_mas.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- FITSfile Name of the FITS data file in
subdirectory h2o_mas, nh3_11 or nh3_22
14- 25 A12 --- Name Name of the region
27- 28 I2 h RAh Right ascension (B1950)
30- 31 I2 min RAm Right ascension (B1950)
33- 36 F4.1 s RAs Right ascension (B1950)
38 A1 --- DE- Declination sign (B1950)
39- 40 I2 deg DEd Declination (B1950)
42- 43 I2 arcmin DEm Declination (B1950)
45- 46 I2 arcsec DEs Declination (B1950)
49- 55 A7 "MM/YYYY" ObsEpoch1 1st Observation epoch
58- 64 A7 "MM/YYYY" ObsEpoch2 2nd Observation epoch
66- 75 A10 --- Name1 ? Other name of the region
77- 83 A7 --- Name2 ? Other name of the region
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Acknowledgements:
Inma Sepulveda, inma(at)rocknrock.com
(End) Inma Sepulveda [Univ. de Barcelona], Patricia Vannier [CDS] 04-Nov-2010