SIMBAD references

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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