2014A&A...566A..61M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:03:44

2014A&A...566A..61M - Astronomy and Astrophysics, volume 566A, 61-61 (2014/6-1)

Detection of a dense clump in a filament interacting with W 51e2.

MOOKERJEA B., VASTEL C., HASSEL G.E., GERIN M., PETY J., GOLDSMITH P.F., BLACK J.H., GIESEN T., HARRISON T., PERSSON C.M. and STUTZKI J.

Abstract (from CDS):

In the framework of the Herschel/PRISMAS guaranteed time key program, the line of sight to the distant ultracompact HII region W51e2 has been observed using several selected molecular species. Most of the detected absorption features are not associated with the background high-mass star-forming region and probe the diffuse matter along the line of sight. We present here the detection of an additional narrow absorption feature at ∼70km/s in the observed spectra of HDO, NH3 and C3. The 70km/s feature is not uniquely identifiable with the dynamic components (the main cloud and the large-scale foreground filament) so-far identified toward this region. The narrow absorption feature is similar to the one found toward low-mass protostars, which is characteristic of the presence of a cold external envelope. The far-infrared spectroscopic data were combined with existing ground-based observations of 12CO, 13CO, CCH, CN, and C3H2 to characterize the 70km/s component. Using a non-LTE analysis of multiple transitions of NH3 and CN, we estimated the density (n(H2)~(1-5)x105cm–3) and temperature (10-30K) for this narrow feature. We used a gas-grain warm-up based chemical model with physical parameters derived from the NH3 data to explain the observed abundances of the different chemical species. We propose that the 70km/s narrow feature arises in a dense and cold clump that probably undergoes collapse to form a low-mass protostar, formed on the trailing side of the high-velocity filament, which is thought to be interacting with the W51 main cloud. While the fortuitous coincidence of the dense clump along the line of sight with the continuum-bright W51e2 compact Hii region has contributed to its nondetection in the continuum images, this same attribute makes it an appropriate source for absorption studies and in particular for ice studies of star-forming regions.

Abstract Copyright:

Journal keyword(s): ISM: molecules - submillimeter: ISM - ISM: lines and bands - line: formation - line: identification - molecular data

Simbad objects: 28

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Number of rows : 28

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 IC 63 HII 00 59 01.37 +60 53 17.8   13.33       ~ 83 1
2 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
3 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1015 2
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
5 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
6 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 682 1
7 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1035 1
8 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 811 1
9 W 31c HII 18 10 29.1 -19 56 05           ~ 301 0
10 W 49n HII 19 10 13.2 +09 06 12           ~ 411 3
11 GAL 048.9-00.3 HII 19 22 +14.0           ~ 14 0
12 [KJB2003] G48.984-0.304 HII 19 22 26.5 +14 06 11           ~ 18 0
13 GAL 049.1-00.4 HII 19 23 +14.2           ~ 7 0
14 GAL 049.2-00.3 HII 19 23 03 +14 16.2           ~ 23 0
15 W 51e6 PoC 19 23 41.7 +14 31 02           ~ 4 0
16 W 51e5 Rad 19 23 41.861 +14 30 56.94           ~ 3 0
17 NAME W 51 IRS 1 PoC 19 23 41.9 +14 30 36           ~ 96 0
18 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 115 0
19 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 130 0
20 W 51e3 Rad 19 23 43.841 +14 30 24.91           B0.5 13 0
21 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 180 0
22 W 51e4 Rad 19 23 43.909 +14 30 29.71           B0.5 15 0
23 GAL 049.5-00.4 MoC 19 23 44 +14 30.7           ~ 22 0
24 W 51e8 HII 19 23 44.2 +14 30 28           ~ 33 0
25 W 51e7 PoC 19 23 44.8 +14 29 11           ~ 4 0
26 W 51 SNR 19 23 50 +14 06.0           ~ 1143 1
27 ICRF J192559.6+210626 QSO 19 25 59.60535560 +21 06 26.1620442           ~ 177 1
28 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 362 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:03:44

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