2007A&A...462..677S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.27CET22:55:58

2007A&A...462..677S - Astronomy and Astrophysics, volume 462, 677-682 (2007/2-1)

A VLA search for young protostars embedded in dense cores.

STAMATELLOS D., WARD-THOMPSON D., WHITWORTH A.P. and BONTEMPS S.

Abstract (from CDS):

Four dense cores, L1582A, L1689A, B133 and B68, classified as prestellar in terms of the absence of detectable NIR emission, are observed at radio wavelengths to investigate whether they nurture very young protostars. We perform deep radio continuum observations at 3.6cm and 6cm using the VLA. No definite young protostars were discovered in any of the four cores observed. A few radio sources were discovered close to the observed cores, but these are most likely extragalactic sources or YSOs unrelated to the cores observed. In L1582A we discovered a weak radio source near the centre of the core with radio characteristics and offset from the peak of the submillimeter emission similar to that of the newly discovered protostar in the core L1014, indicating a possible protostellar nature for this source. This needs to be confirmed with near- and/or mid-infrared observations (e.g. with Spitzer). Hence based on the current observations we are unable to confirm unequivocally that L1582A is starless. In L1689A a possible 4.5-σ radio source was discovered at the centre of the core, but needs to be confirmed with future observations. In B133 a weak radio source, possibly a protostar, was discovered at the edge of the core on a local peak of the core submm emission, but no source was detected at the centre of the core. Thus, B133 is probably starless, but may have a protostar at its edge. In B68 no radio sources were discovered inside or at the edge of the core, and thus B68 is indeed starless. Four more radio sources with spectral indices characteristic of young protostars were discovered outside the cores but within the extended clouds in which these cores reside. We conclude that the number of cores misclassified as prestellar is probably very small and does not significantly alter the estimated lifetime of the prestellar phase.

Abstract Copyright:

Journal keyword(s): stars: formation - radio continuum: stars - ISM: clouds

Nomenclature: Table 3: [SWW2007] L1582A N (Nos 1-3), [SWW2007] L1689A N (Nos 1-6), [SWW2007] B133 N (Nos 1-4), [SWW2007] B68 N (Nos 1-4).

CDS comments: Calibrator 1751-253 not identified.

Simbad objects: 43

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Number of rows : 43

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 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2462 2
2 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 179 1
3 Bad 16 Y*O 04 30 50.280 +23 00 08.85   18.08   14.95   F1 132 0
4 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3379 0
5 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 876 1
6 NAME [BM89] L1582A DNe 05 31 18.4 +12 30 31           ~ 33 0
7 [SWW2007] L1582A 1 Rad 05 32 00.5 +12 30 40           ~ 1 0
8 [SWW2007] L1582A 2 Rad 05 32 06.3 +12 32 41           ~ 1 0
9 [SWW2007] L1582A 3 Rad 05 32 08.9 +12 29 34           ~ 1 0
10 LMZ 3 IR 05 46 08.8 -00 10 47           ~ 83 0
11 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3660 1
12 QSO B1519-273 BLL 15 22 37.67598872 -27 30 10.7854174   18.72 18.5 17.42   ~ 253 1
13 QSO B1622-297 QSO 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 356 0
14 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 368 0
15 [SSG2006] MMS002 smm 16 26 26.50 -24 24 30.9           ~ 241 0
16 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2972 0
17 LDN 1689A DNe 16 32 12.5 -25 02 53           ~ 24 0
18 [SWW2007] L1689A 6 Rad 16 32 13.3 -25 03 45           ~ 1 0
19 [SWW2007] L1689A 5 Rad 16 32 13.8 -25 02 38           ~ 1 0
20 [SWW2007] L1689A 3 Rad 16 32 13.9 -25 02 25           ~ 1 0
21 [SWW2007] L1689A 4 Rad 16 32 14.2 -25 02 04           ~ 1 0
22 [SWW2007] L1689A 1 Rad 16 32 23.3 -25 00 34           ~ 1 0
23 [SWW2007] L1689A 2 Rad 16 32 25.4 -25 02 16           ~ 1 0
24 [SWW2007] B68 3 Rad 17 22 28.0 -23 50 32           ~ 1 0
25 [SWW2007] B68 2 Rad 17 22 31.8 -23 48 18           ~ 1 0
26 [SWW2007] B68 1 Rad 17 22 35.0 -23 47 58           ~ 1 0
27 [SWW2007] B68 4 Rad 17 22 35.4 -23 52 34           ~ 1 0
28 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 277 1
29 PSR B1742-30 Psr 17 45 56.305 -30 40 23.50           ~ 142 0
30 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 898 2
31 NAME Aql Rift DNe 18 32 -01.0           ~ 224 1
32 PMN J1906-0650 Rad 19 06 05.70 -06 50 07.0           ~ 3 1
33 [SWW2007] B133 1 Rad 19 06 05.7 -06 50 06           ~ 1 0
34 [SWW2007] B133 4 Rad 19 06 07.0 -06 53 58           ~ 1 0
35 [SWW2007] B133 3 Rad 19 06 08.4 -06 53 32           ~ 1 0
36 LDN 531 DNe 19 06 10.0 -06 53 45           ~ 65 0
37 [SWW2007] B133 2 Rad 19 06 14.0 -06 49 35           ~ 1 0
38 QSO B1937-1009 QSO 19 39 57.2569480405 -10 02 41.525657493   18.800 19.0 17.188   ~ 164 1
39 LEDA 2830151 Sy2 19 41 15.1 -15 24 31     22.5     ~ 75 1
40 LDN 1148 DNe 20 40 31.6 +67 21 45           ~ 59 0
41 LDN 1014 cor 21 24 05.9 +49 59 07           ~ 91 0
42 NAME LDN 1014 IRS Y*O 21 24 07.58 +49 59 08.9           ~ 74 0
43 NAME Cep Flare MoC 23 34 +72.0           ~ 99 0

    Equat.    Gal    SGal    Ecl

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2020.02.27-22:55:59

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