2014A&A...572A..63I


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST01:01:01

2014A&A...572A..63I - Astronomy and Astrophysics, volume 572A, 63-63 (2014/12-1)

Diversity of chemistry and excitation conditions in the high-mass star forming complex W 33.

IMMER K., GALVAN-MADRID R., KOENIG C., LIU H.B. and MENTEN K.M.

Abstract (from CDS):

The object W 33 is a giant molecular cloud that contains star forming regions at various evolutionary stages from quiescent clumps to developed HII regions. Since its star forming regions are located at the same distance and the primary material of the birth clouds is probably similar, we conducted a comparative chemical study to trace the chemical footprint of the different phases of evolution. We observed six clumps in W 33 with the Atacama Pathfinder Experiment (APEX) telescope at 280GHz and the Submillimeter Array (SMA) at 230GHz. We detected 27 transitions of 10 different molecules in the APEX data and 52 transitions of 16 different molecules in the SMA data. The chemistry on scales larger than ∼0.2pc, which are traced by the APEX data, becomes more complex and diverse the more evolved the star forming region is. On smaller scales traced by the SMA data, the chemical complexity and diversity increase up to the hot core stage. In the HII region phase, the SMA spectra resemble the spectra of the protostellar phase. Either these more complex molecules are destroyed or their emission is not compact enough to be detected with the SMA. Synthetic spectra modelling of the H2CO transitions, as detected with the APEX telescope, shows that both a warm and a cold component are needed to obtain a good fit to the emission for all sources except for W 33 Main 1. The temperatures and column densities of the two components increase during the evolution of the star forming regions. The integrated intensity ratios N2H+(3-2)/CS(6-5) and N2H+(3-2)/H2CO(42,2-32,1) show clear trends as a function of evolutionary stage, luminosity, luminosity-to-mass ratio, and H2 peak column density of the clumps and might be usable as chemical clocks.

Abstract Copyright:

Journal keyword(s): stars: formation - astrochemistry - stars: protostars - ISM: individual objects: W 33 - submillimeter: ISM - ISM: molecules

VizieR on-line data: <Available at CDS (J/A+A/572/A63): list.dat fits/*>

Status in Simbad:  being processed

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1939 1
2 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2634 2
3 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78   ~ 954 1
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1851 1
5 SNR G012.7-00.0 SNR 18 13.3 -17 54           ~ 16 0
6 [MFD2008] Stellar Cluster OpC 18 13 24.0 -17 53 31           ~ 12 0
7 SNR G012.8-00.0 SNR 18 13.6 -17 49           ~ 46 0
8 MMB G012.681-00.182 Mas 18 13 54.7457 -18 01 46.588           ~ 43 0
9 [MCM2005b] 1 OpC 18 13 55 -17 56.9           ~ 10 0
10 [MDF2011b] cl2 As* 18 14 08.0 -18 00 15           ~ 6 0
11 NAME W 33-Met HII 18 14 12.5 -17 55 44           ~ 26 0
12 NAME W 33 IR Cluster Cl* 18 14 13 -17 55.9           ~ 3 0
13 [JGD81] H2O 012.81-0.20 Mas 18 14 13.8283 -17 55 21.035           ~ 7 0
14 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 213 0
15 [MDF2011b] cl1 As* 18 14 22.0 -17 56 10           ~ 4 0
16 GAL 012.90-00.24 Mas 18 14 34.4366 -17 51 51.891           ~ 2 0
17 [VM2005] W33A Q1 mm 18 14 39.46 -17 52 00.5           ~ 16 0
18 MMB G012.909-00.260 Mas 18 14 39.5714 -17 52 00.380           ~ 62 0
19 [BDS2003] 114 OpC 18 14 40 -17 52.1           ~ 5 1
20 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 325 1
21 [WWB83] G033.91+0.11 HII 18 52 50.4 +00 55 29           ~ 85 1
22 W 49a SFR 19 10 15.7 +09 06 05           ~ 255 2
23 QSO B1908-202 QSO 19 11 09.65289198 -20 06 55.1089891   18.21   18.14   ~ 229 0
24 NAME Scutum Spiral Arm PoG ~ ~           ~ 256 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-01:01:01

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