J/A+A/327/755 OH maser emission from IRAS sources (Palla+ 1997)
Search for H2O maser emission from high-latitude IRAS sources
Palla F., Codella C., Valdettaro R., Baffa C.
<Astron. Astrophys. 327, 755 (1997)>
=1997A&A...327..755P 1997A&A...327..755P (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Masers ; Radio lines
Keywords: masers - stars: formation - ISM: clouds - galaxies: starburst
Abstract:
A high-sensitivity search for water maser emission at 22.2 GHz has
been performed on a sample of 91 IRAS point sources at high-latitudes.
The aim of the survey is to verify if these clouds are capable of star
formation as indicated by the presence of water masers. The sample is
based on the recent work of Magnani et al. (1995ApJS...96..159M 1995ApJS...96..159M) who
have identified 192 infrared objects from the IRAS Faint Source Survey
possibly associated with translucent clouds at galactic latitudes
|b|≥30°. These IRAS sources have far-infrared colours typical of
young stellar objects and pre-main-sequence stars and thus provide a
starting list for further studies about their actual nature. H2O
maser emission is a good diagnostic of the presence of dense gas and
of recent star formation. We did not find water maser emission at a
level of 0.2-0.5Jy (3σ) in any of the 91 objects. The negative
result indicates that these high-latitude sources do not represent
potential sites of star formation, consistent with the fact that most
high-latitude molecular clouds do not appear gravitationally bound.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 73 56 Sources with IRAS emission at all four bands
(Sample A)
table2 57 35 Sources with IRAS emission in the 12, 25, 60µm
(Sample B)
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See also:
J/A+A/277/453 : OH maser survey of cool IRAS sources (David+ 1993)
Byte-by-byte Description of file: table1 table2
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Source Name
10- 20 A11 --- IRAS IRAS Source Name
24- 25 I2 h RAh Right Ascension (1950)
27- 28 I2 min RAm Right Ascension (1950)
30- 33 F4.1 s RAs Right Ascension (1950)
37 A1 --- DE- Declination sign
38- 39 I2 deg DEd Declination (1950)
41- 42 I2 arcmin DEm Declination (1950)
44- 45 I2 arcsec DEs Declination (1950)
49- 52 F4.2 Jy rms Noise of the spectrum
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Acknowledgements: Claudio Codella
(End) Patricia Bauer [CDS] 09-Jul-1997