2008A&A...479L..25Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET04:26:21

2008A&A...479L..25Z - Astronomy and Astrophysics, volume 479, L25-28 (2008/2-4)

Forming an early O-type star through gas accretion?

ZAPATA L.A., PALAU A., HO P.T.P., SCHILKE P., GARROD R.T., RODRIGUEZ L.F. and MENTEN K.

Abstract (from CDS):

We present high angular resolution (∼3'') and sensitive 1.3mm continuum, cyanogen (CN) and vinyl cyanide (C2H3CN) line observations made with the Submillimeter Array (SMA) toward one of most highly obscured objects of the W51 IRS2 region, W51 North. We find that the CN line exhibits a pronounced inverse P-Cygni profile indicating that the molecular gas is falling into this object with a mass accretion rate between 4 and 7x10–2M/yr. The C2H3CN traces an east-west rotating molecular envelope that surrounds either a single obscured (proto)star with a kinematic mass of 40M or a small central cluster of B-type stars and that is associated with a compact high velocity bipolar outflow traced by H2O masers and SiO molecular emission. We thus confirm that the W51 North region is part of the growing list of young massive star forming regions that have been associated with infalling motion and with high mass accretion rates (∼10–2-10–4M/yr), strengthening the evidence that massive stars can form with very high accretion rates sufficient to quench the formation of a UCHII region.

Abstract Copyright:

Journal keyword(s): molecular data - techniques: interferometric - stars: formation - ISM: jets and outflows - ISM: molecules - radio lines: ISM

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IRAS 16547-4247 Y*O 16 58 17.21 -42 52 08.9           ~ 119 0
2 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 486 1
3 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 833 1
4 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 75 0
5 OKYM W51 IRS 2 6 IR 19 23 39.816 +14 31 05.07           ~ 22 0
6 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 145 0
7 [WBN74] W 51 IRS 2 SFR 19 23 40.05 +14 31 07.1           ~ 256 0
8 KJD 3 IR 19 23 40.18 +14 31 06.1           ~ 6 0
9 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 187 0
10 W 51 SNR 19 23 50 +14 06.0           ~ 1174 1
11 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 403 0
12 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 500 0
13 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 374 3
14 IRAS 23118+6110 Y*O 23 14 01.63 +61 27 20.2           ~ 349 0
15 OKYM W51 IRS 2 1 IR ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-04:26:21

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