2020MNRAS.491..427B

Query : 2020MNRAS.491..427B

2020MNRAS.491..427B - Mon. Not. R. Astron. Soc., 491, 427-439 (2020/January-1)

Sulphur-bearing and complex organic molecules in an infrared cold core.

BEAKLINI P.P.B., MENDOZA E., CANELO C.M., ALEMAN I., MERELLO M., KONG S., NAVARETE F., JANOT-PACHECO E., ABRAHAM Z., LEPINE J.R.D., DE ALMEIDA A.A. and FRIACA A.C.S.

Abstract (from CDS):

Since the start of ALMA (Atacama Large Millimeter Array) observatory operation, new and important chemistry of infrared cold core was revealed. Molecular transitions at millimetre range are being used to identify and to characterize these sources. We have investigated the 231 GHz ALMA archive observations of the infrared dark cloud region C9, focusing on the brighter source that we called as IRDC-C9 Main. We report the existence of two substructures on the continuum map of this source: a compact bright spot with high chemistry diversity that we labelled as core, and a weaker and extended one, that we labelled as tail. In the core, we have identified lines of the molecules OCS(19-18), 13CS(5-4), and CH3CH2CN, several lines of CH3CHO and the k-ladder emission of 13CH3CN. We report two different temperature regions, while the rotation diagram of CH3CHO indicates a temperature of 25 K, the rotation diagram of 13CH3CN indicates a warmer phase at temperature of ∼450 K. In the tail, only the OCS(19-18) and 13CS(5-4) lines were detected. We used the NAUTILUS and the RADEX codes to estimate the column densities and the abundances. The existence of hot gas in the core of IRDC-C9 Main suggests the presence of a protostar, which is not present in the tail.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): astrochemistry - stars: formation - ISM: clouds - ISM: molecules

Nomenclature: Fig. 1: [BMC2020] IRDC-C9 Main N=1, [BMC2020] IRDC-C9 Main Core N=1, [BMC2020] IRDC-C9 Main Tail N=1.

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 - 2026 		#notes
1 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 242 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1872 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
5 LDN 134 MoC 15 53 36.3 -04 35 26           ~ 217 0
6 LDN 1689B DNe 16 34 42.1 -24 36 11           ~ 181 0
7 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
8 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 89 0
9 AGAL G028.364+00.121 cor 18 42 40.01 -04 00 34.4           ~ 31 0
10 AGAL G028.354+00.102 Y*O 18 42 44.02 -04 01 54.5           ~ 29 0
11 AGAL G028.324+00.067 Y*O 18 42 46.7 -04 04 08           ~ 59 0
12 AGAL G028.354+00.072 MoC 18 42 49.34 -04 02 27.3           ~ 37 0
13 AGAL G028.344+00.061 cor 18 42 50.45 -04 03 17.7           ~ 93 0
14 [KTC2017] C9B cor 18 42 51.36 -03 59 50.4           ~ 2 0
15 AGAL G028.398+00.081 cor 18 42 51.86 -03 59 43.3           ~ 60 0
16 [BMC2020] IRDC-C9 Main Core smm 18 42 51.980 -03 59 54.06           ~ 5 0
17 [KTC2017] C9A cor 18 42 52.02 -03 59 46.8           ~ 6 0
18 [BMC2020] IRDC-C9 Main Tail smm 18 42 52.120 -03 59 54.23           ~ 4 0
19 [BMC2020] IRDC-C9 Main mm 18 42 52.2 -03 59 53           ~ 2 0
20 [RJS2006] MSXDC G028.37+00.07 MM14 MoC 18 42 52.59 -04 02 44.3           ~ 20 0
21 [KTC2017] C9C cor 18 42 52.62 -03 59 40.8           ~ 2 0
22 AGAL G028.361+00.054 cor 18 42 54.37 -04 02 31.7           ~ 36 1
23 AGAL G028.388+00.037 MoC 18 42 59.99 -04 01 33.1           ~ 29 0
24 AGAL G034.459+00.247 Y*O 18 53 20.4 +01 28 23           ~ 71 0

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