2003A&A...403.1095M


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET09:27:27

2003A&A...403.1095M - Astronomy and Astrophysics, volume 403, 1095-1100 (2003/6-1)

The protostellar mass limit for 6.7 GHz methanol masers. I. A low-mass YSO survey.

MINIER V., ELLINGSEN S.P., NORRIS R.P. and BOOTH R.S.

Abstract (from CDS):

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. The less massive objects in our sample do not exhibit any methanol maser stronger than 400mJy (4σ). Based on the nil detection rate toward the low-mass YSOs we can place an upper limit of 3x106K on the brightness temperature of any methanol maser associated with class 0, I or II sources. These results support the hypothesis that no strong methanol masers are associated with low-mass star formation (≲3M).

Abstract Copyright:

Journal keyword(s): masers - stars: formation - stars: circumstellar matter

VizieR on-line data: <Available at CDS (J/A+A/403/1095): table1.dat>

CDS comments: LDN 1830 is a misprint for LDN 1630.

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 935 2
2 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 214 1
3 OMC 2 MoC 05 35 27 -05 10.1           ~ 375 1
4 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 436 0
5 [MCK88] NGC 2024 FIR 2 Y*? 05 41 42.50 -01 54 06.0           ~ 38 0
6 [MCK88] NGC 2024 FIR 3 PoC 05 41 43.00 -01 54 24.0           ~ 48 0
7 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1060 1
8 [MCK88] NGC 2024 FIR 4 Y*O 05 41 44.00 -01 54 42.0           ~ 54 0
9 [BCB89] IRS 3 Y*O 05 41 44.429 -01 55 23.59           ~ 15 0
10 [MCK88] NGC 2024 FIR 5 cor 05 41 44.6 -01 55 38           ~ 91 0
11 [MCK88] NGC 2024 FIR 7 cor 05 41 44.90 -01 56 15.0           ~ 33 0
12 [MCK88] NGC 2024 FIR 6 IR 05 41 45.00 -01 56 01.0           ~ 53 0
13 [BCB89] IRS 20 Y*O 05 41 45.127 -01 54 47.09           ~ 6 0
14 [BCB89] IRS 2 * 05 41 45.81 -01 54 29.8           B 90 0
15 LDN 1630 DNe 05 45.5 -00 59           ~ 347 0
16 NGC 3603 HII 11 15 24 -61 15.0           ~ 927 2
17 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 46 0
18 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 201 1

    Equat.    Gal    SGal    Ecl

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2020.01.29-09:27:27

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