2004A&A...414..289M


Query : 2004A&A...414..289M

2004A&A...414..289M - Astronomy and Astrophysics, volume 414, 289-298 (2004/1-4)

Very compact radio emission from high-mass protostars. I. CRL 2136: Continuum and water maser observations.

MENTEN K.M. and VAN DER TAK F.F.S.

Abstract (from CDS):

We report 5-43 GHz radio observations of the CRL 2136 region at 0.6"-6'' resolution. We detect weak (mJy intensity) radio emission from the deeply embedded high-mass protostar IRS 1, which has an optically thick spectrum up to frequencies of 22GHz, flattening at higher frequencies, which might be explained by emission from a jet. Water maser mapping shows that the strong emission observed redshifted relative to the systemic velocity is spatially coincident with the optically thick continuum emission. The H2O maser emission from this object (and others we know of) seems to have a different origin than most of these masers, which are frequently tracing bipolar high-velocity outflows. Instead, the CRL 2136 H2O emission arises in the close circumstellar environment of the protostar (within 1000AU). We speculate that most of it is excited in the hot, dense infalling gas after the accretion shock, although this cannot explain all the H2O emission. An accretion shock nature for the continuum emission seems unlikely.

Abstract Copyright:

Journal keyword(s): ISM: molecules - stars: circumstellar matter - stars: formation

Nomenclature: Table 1: [MV2004] RS N (Nos 1-5), [MV2004] CH3OH N=1, [MV2004] H2O N=1.

CDS comments: IRS 1 = [KWA92] IRS 1, Cep A HW2 = [HW84] 2, W75N(B) = [HRB81] W75N(B).

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* V710 Cas Or* 00 36 45.9936324072 +63 28 52.969968696           ~ 91 0
2 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1023 2
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2278 1
4 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 633 1
5 [PGS81] IRS 3 IR 05 47 04.63 +00 21 47.9           ~ 54 0
6 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4312 2
7 QSO B1730-130 QSO 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1133 1
8 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 693 0
9 [MV2004] RS 1 Rad 18 22 17.22 -13 27 41.4           ~ 1 0
10 [MV2004] RS 2 Rad 18 22 22.11 -13 33 18.5           ~ 1 0
11 [MV2004] RS 3 Rad 18 22 26.10 -13 30 09.7           ~ 1 0
12 Caswell CH3OH 017.64+00.16 Mas 18 22 26.30 -13 30 12.1           ~ 11 0
13 [MV2004] RS 4 Rad 18 22 26.37 -13 30 11.9           ~ 4 0
14 [MV2004] H2O Mas 18 22 26.38 -13 30 11.8           ~ 1 0
15 RAFGL 2136 Y*O 18 22 26.52888 -13 30 14.0400           ~ 283 0
16 [MV2004] RS 5 Rad 18 22 39.209 -13 29 56.36           ~ 1 0
17 W 49 SFR 19 10 20 +09 07.7           ~ 572 1
18 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 619 0
19 NAME W75N(B) cor 20 38 36.44 +42 37 34.1           ~ 47 0
20 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 224 0
21 IRAS 23118+6110 Y*O 23 14 02.09473 +61 27 18.8460           ~ 373 0
22 NAME Juggler Nebula RNe ~ ~           ~ 6 0

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