2007A&A...467..207P


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST21:56:51

2007A&A...467..207P - Astronomy and Astrophysics, volume 467, 207-216 (2007/5-3)

Probing the initial conditions of high mass star formation. I. Deuteration and depletion in high mass pre/protocluster clumps.

PILLAI T., WYROWSKI F., HATCHELL J., GIBB A.G. and THOMPSON M.A.

Abstract (from CDS):

UltraCompact Hii regions are signposts of high-mass star formation. Since high-mass star formation occurs in clusters, one expects to find even earlier phases of massive star formation in the vicinity of UltraCompact Hii regions. Here, we study the amount of deuteration and depletion toward pre/protocluster clumps found in a wide-field (10x10-arcmin) census of clouds in 32 massive star-forming regions that are known to harbour UCHii regions. We determine the column density of NH3, NH2D, CO, H13CN, and HC15N lines. We used the (J,K)=(1,1) and (2,2) inversion transitions of NH3 to constrain the gas temperatures. We find that 65% of the observed sources have strong NH2D emission and more than 50% of the sources exhibit a high degree of deuteration, (0.1≤NH2D/NH3≤0.7), 0.7 being the highest observed deuteration of NH3 reported to date. Our search for NHD2 in two sources did not result in a detection. The enhancement in deuteration coincides with moderate CO depletion onto dust grains. There is no evidence of a correlation between the two processes, though an underlying correlation cannot be ruled out as the depletion factor is very likely to be only a lower limit. Based on simultaneously observed H13CN and HC15N (J=1-0) lines, we derive a high abundance ratio of H13CN to HC15N, which might indicate anomalous ratios of C and N isotopes relative to those derived toward the local ISM. We find CO depletion and high deuteration towards cold cores in massive star forming regions. Therefore, these are good candidates for sources at the early phases of massive star formation. While our sensitive upper limits on NHD2 do not prove the predictions of the gas-phase and grain chemistry models wrong, an enhancement of ≃104 over the cosmic D/H ratio from NH2D warrants explanation.

Abstract Copyright:

Journal keyword(s): stars: formation - astrobiology - molecular data - methods: observational - ISM: clouds - radio lines: ISM

Nomenclature: Table 2: SCAMPS GLLL.ll+BB.bb N=23.

Simbad objects: 31

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Number of rows : 31

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 SCAMPS G8.13+0.25 smm 18 02 55.69 -21 47 46.7           ~ 1 0
2 SCAMPS G8.68-0.37 smm 18 06 23.24 -21 37 14.1           ~ 11 0
3 [WWS2012] G008.71-00.37 cor 18 06 27.2927 -21 35 49.303           ~ 11 0
4 SCAMPS G10.15-0.34 smm 18 09 21.38 -20 19 32.8           ~ 1 0
5 [WWS2012] G010.21-00.31 cor 18 09 21.3906 -20 15 19.488           ~ 15 0
6 SCAMPS G10.21-0.32 smm 18 09 24.52 -20 15 41.4           ~ 1 0
7 AGAL G010.614-00.331 Y*O 18 10 15.62 -19 54 46.6           ~ 16 0
8 MMB G011.109-00.114 Y*O 18 10 28.4449 -19 22 38.782           ~ 47 0
9 [CCE98b] 011.11-0.12 Cld 18 10.5 -19 23           ~ 85 1
10 SCAMPS G12.19-0.12 smm 18 12 41.67 -18 25 19.8           ~ 1 0
11 SCAMPS G13.18+0.06 smm 18 14 00.92 -17 28 41.2           ~ 2 0
12 SCAMPS G15.03-0.65 smm 18 20 18.80 -16 11 22.6           ~ 1 0
13 SCAMPS G15.01-0.67 smm 18 20 21.22 -16 12 42.2           ~ 1 0
14 SCAMPS G15.01-0.69 smm 18 20 24.22 -16 13 22.8           ~ 1 0
15 SCAMPS G18.17-0.30 smm 18 25 07.53 -13 14 32.7           ~ 1 0
16 SCAMPS G18.21-0.34 smm 18 25 21.55 -13 13 39.5           ~ 1 0
17 [CCE98b] 019.30+0.07 Cld 18 25 56.78 -12 04 25.0           ~ 12 0
18 [CUS2014] G023.4366-0.1828 Mas 18 34 39.3048 -08 31 35.267           ~ 28 1
19 SCAMPS G23.41-0.23 smm 18 34 45.74 -08 34 21.2           ~ 5 0
20 AGAL G023.419-00.232 Y*O 18 34 48.1 -08 33 57           ~ 8 0
21 SCAMPS G27.31+0.18 smm 18 40 32.45 -04 55 03.8           ~ 1 0
22 SCAMPS G27.29+0.15 smm 18 40 34.70 -04 57 18.1           ~ 1 0
23 NAME Dragon Nebula DNe 18 42 50.6 -04 03 30           ~ 113 0
24 SCAMPS G29.97-0.05 smm 18 46 12.25 -02 39 05.9           ~ 10 0
25 [PWC2006] NH3 G33.71-0.01 Cld 18 52 53.81 +00 41 06.4           ~ 4 0
26 SCAMPS G34.81-0.28 smm 18 53 20.148 +01 28 31.50           ~ 1 0
27 SCAMPS G35.19-1.73 smm 19 01 45.45 +01 13 21.5           ~ 3 0
28 [PWC2006] NH3 G79.34+0.33 Cld 20 32 21.803 +40 20 08.00           ~ 13 0
29 [CGC93] FIR 1 IR 20 39 00.37 +42 24 36.6           ~ 22 0
30 [PWC2006] NH3 G11.11-0.12 P3 smm ~ ~           ~ 4 0
31 [PWC2006] NH3 G11.11-0.12 P4 smm ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.08.04-21:56:51

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