J/A+A/403/1095 6.7GHz methanol masers survey of low-mass YSO (Minier+, 2003)
The protostellar mass limit for 6.7 GHz methanol masers.
I. A low-mass YSO survey.
Minier V., Ellingsen S.P., Norris R.P., Booth R.S.
<Astron. Astrophys. 403, 1095 (2003)>
=2003A&A...403.1095M 2003A&A...403.1095M
ADC_Keywords: Masers ; Radio sources
Keywords: masers - stars: formation - stars: circumstellar matter
Abstract:
We report the results of a search for 6.7-GHz methanol masers toward
low-mass young stellar objects (YSOs) and (pre)protostellar
condensations with the Australia Telescope Compact Array (ATCA). Our
sample consisted of 13 class 0 protostars and 44 class I YSOs as well
as 66 (pre)protostellar condensations. A single detection was obtained
toward NGC 2024: FIR4 in the Orion B region. This is the first
detection of a 6.7-GHz methanol maser in Orion. The nature of FIR4 has
been a subject of debate with some evidence suggesting that it is a
very cold high-mass (pre)protostellar condensation and others arguing
that it is a low-mass YSO. The discovery of a methanol maser
associated with this source is inconsistent with both of these
hypotheses and we suggest that FIR4 probably harbours an intermediate-
or high-mass YSO.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 145 175 Source list
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See also:
J/A+AS/134/115 : Medicina 6.7GHz methanol masers survey (Slysh+ 1999)
J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000)
J/AZh/72/22 : A 95 GHz Survey of Methanol Masers (Valtts+, 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Field of view Right ascension (J2000)
4- 5 I2 min RAm Field of view Right ascension (J2000)
7- 13 F7.4 s RAs Field of view Right ascension (J2000)
15 A1 --- DE- Field of view Declination sign (J2000)
16- 17 I2 deg DEd Field of view Declination (J2000)
19- 20 I2 arcmin DEm Field of view Declination (J2000)
22- 27 F6.3 arcsec DEs Field of view Declination (J2000)
29- 66 A38 --- Region Region name
68- 84 A17 --- Source Source name
86 A1 --- l_Flux Limit flag on Flux
87- 91 F5.3 Jy Flux ? Flux at 6.7GHz (1)
92 A1 --- n_Flux [*] *: Measured in the channel map
94-103 A10 --- Class Class (2)
105-137 A33 ---- Assoc Associations
139-145 A7 ---- Ref References (3)
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Note (1): Measured as the maximum intensity in the data cube;
values below 400mJy are considered as null detection
Note (2): Class 0, I, II are YSO classes;
COND. stands for "Protostellar Condensation'.
Note (3): References as follows:
1 = Claussen et al., 1996ApJS..106..111C 1996ApJS..106..111C
2 = Carkner et al., 1998AJ....116.1933C 1998AJ....116.1933C
3 = Chini et al., 1997ApJ...474L.135C 1997ApJ...474L.135C
4 = Rodriguez & Reipurt, 1996RMxAA..32...27R 1996RMxAA..32...27R
5 = Gregersen et al., 1997ApJ...484..256G 1997ApJ...484..256G
6 = Chandler & Carlstrom, 1996ApJ...466..338C 1996ApJ...466..338C
7 = Mezger et al., 1992A&A...256..631M 1992A&A...256..631M
8 = Bontemps et al., 1995A&A...297...98B 1995A&A...297...98B
9 = Brandl et al., 1999A&A...352L..69B 1999A&A...352L..69B
10 = Chen et al., 1997ApJ...478..295C 1997ApJ...478..295C
11 = Andre et al., 1994ApJ...420..837A 1994ApJ...420..837A
12 = Bouvier & Appenzeller, 1992A&AS...92..481B 1992A&AS...92..481B
13 = Motte et al., 1998A&A...336..150M 1998A&A...336..150M
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History:
From electronic version of the journal
Lynds 1830 is a misprint for Lynds 1630, corrected in table1
(End) James Marcout, Patricia Bauer [CDS] 31-Jul-2003