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J/MNRAS/276/57 IRAS Galactic star-forming regions. II. (Codella+ 1995)
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IRAS-selected Galactic star-forming regions. - II. Water maser detections in
the extended sample
Codella C., Palumbo G.G.C., Pareschi G., Scappini F.,
Caselli P., Attolini M.R.
<Mon. Not. R. Astron. Soc. 276, 57 (1995)>
=1995MNRAS.276...57C (SIMBAD/NED BibCode)
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ADC_Keywords: Masers ; Infrared sources ; Spectroscopy ; Radio lines
Keywords: masers - stars: formation - ISM: molecules -
infrared: ISM: continuum - radio lines: ISM
Abstract:
The results of the analysis of the occurrence of 22.2-GHz H_2_O maser
emission in a sample of 1409 IRAS sources north of declination -30deg
associated with star-forming regions are presented. Our sample
contains all the IRAS sources that satisfy Emerson criteria for
selecting molecular cores associated with the earliest evolutionary
stages of the star-forming process. In a previous paper (Paper I,
1994MNRAS.266..123P), we have reported the results of the
observations of about one third of the sample. In the present paper
the observations of the remaining IRAS sources are presented: 18 of
them are newly detected maser sources. The results show that 20 per
cent of all IRAS sources that satisfy the Wood & Churchwell criteria
have H2O water masers. This is in agreement with the assumption that
these criteria select objects that are connected with the early phases
of the evolution of high-mass star-forming regions. Moreover, about
one third of the whole sample selected according to Emerson criteria
contains IRAS sources that are not associated with massive
star-forming processes, but probably with molecular cores in low-mass
star-forming regions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 384 Subsample A
table2.dat 37 160 Subsample B
table3.dat 37 443 Subsample C
table5.dat 86 18 Derived parameters of the new maser sources
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
J/A+AS/98/589 : IRAS Sources behind the Solar circle (Wouterloot+ 1993)
Byte-by-byte Description of file: table1.dat, table2.dat, table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS name
11 A1 --- m_IRAS Multilpicity index on IRAS name
13- 18 F6.2 deg GLON Galactic longitude
20- 25 F6.2 deg GLAT Galactic latitude
27 A1 --- l_Fpeak Limit flag on Fpeak
28- 32 F5.1 Jy Fpeak ? Peak flux density
33- 34 A2 --- n_Fpeak [ND ] Note on Fpeak (1)
36- 37 I2 --- r_Fpeak Fpeak references (2)
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Note (1): D: Detected as maser by others
ND: Not detected as maser by others
Note (2): References:
1 Present Work
2 Palla et al., 1991A&A...246..249P
3 Felli et al., 1992A&A...255..293F
4 Palla, 1992 (unspecified reference, occurs for IRAS 18134-1652)
5 Comoretto et al., 1990A&AS...84..179C
6 Arcetri Data-base
7 Henning et al., 1992A&AS...93..525H
9 Wouterloot & Walmsley, 1986A&A...168..237W
14 Genzel & Downes, 1977A&A....61..117G
15 Scalise et al., 1989A&A...221..105S
17 Gyulbudaghian et. al., 1990RMxAA..20...51G
19 Wouterloot. et al., 1993A&AS...98..589W, Cat. <J/A+AS/98/589>
20 Palla et al., 1993A&A...280..599P
21 Caswell et al 1983AuJPh..36..443C
22 Churchwell et al., 1990A&ARv...2...79C
23 Knapp & Morris, 1976ApJ...206..713K
24 Jaffe et al., 1981ApJ...250..621J
25 Genzel & Downes, 1979A&A....72..234G
26 Matthews et. al., 1985A&A...149..227M
27 Braz et al., 1989A&AS...77..465B
28 Codella et al., 1994A&A...291..261C
29 Wouterloot et al., 1986A&A...168..237W
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS name
12 A1 --- Sample [ABC] Subsample
14 A1 --- l_F12 Limit flag on F12
15- 22 E8.2 Jy F12 Flux density at 12{mu}m
24 A1 --- l_F25 Limit flag on F25
25- 32 E8.2 Jy F25 Flux density at 25{mu}m
34 A1 --- l_F60 Limit flag on F60
35- 42 E8.2 Jy F60 Flux density at 60{mu}m
44 A1 --- l_F100 Limit flag on F100
45- 52 E8.2 Jy F100 Flux density at 100{mu}m
54- 61 A8 "DD/MM/YY" Date Observing date
63- 67 F5.1 Jy Fpeak Flux of the strongest component
69- 72 F4.1 Jy rms Noise of the spectrum
74- 79 F6.1 km/s Vpeak Velocity of the strongest component
81- 86 F6.1 Jy.km/s FH2O Integrated flux computed over the whole
emission interval
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 29-Nov-1996