2012ApJ...745..126W


Query : 2012ApJ...745..126W

2012ApJ...745..126W - Astrophys. J., 745, 126 (2012/February-1)

An unbiased spectral line survey toward r CrA IRS7B in the 345 GHz window with ASTE.

WATANABE Y., SAKAI N., LINDBERG J.E., JORGENSEN J.K., BISSCHOP S.E. and YAMAMOTO S.

Abstract (from CDS):

We have conducted a spectral line survey in the 332-364 GHz region with the Atacama Submillimeter Telescope Experiment 10 m telescope toward R CrA IRS7B, a low-mass protostar in the Class 0 or Class 0/I transitional stage. We have also performed some supplementary observations in the 450 GHz band. In total, 16 molecular species are identified in the 332-364 GHz region. Strong emission lines of CN and CCH are observed, whereas complex organic molecules and long carbon-chain molecules, which are characteristics of hot corino and warm carbon-chain chemistry (WCCC) source, respectively, are not detected. The rotation temperature of CH3 OH is evaluated to be 31 K, which is significantly lower than that reported for the prototypical hot corino IRAS 16293-2422 (∼85 K). The deuterium fractionation ratios for CCH and H2CO are obtained to be 0.038 and 0.050, respectively, which are much lower than those in the hot corino. These results suggest a weak hot corino activity in R CrA IRS7B. On the other hand, the carbon-chain related molecules, CCH and c-C3H2, are found to be abundant. However, this source cannot be classified as a WCCC source, since long carbon-chain molecules are not detected. If WCCC and hot corino chemistry represent the two extremes in chemical compositions of low-mass Class 0 sources, R CrA IRS7B would be a source with a mixture of these two chemical characteristics. The UV radiation from the nearby Herbig Ae star R CrA may also affect the chemical composition. The present line survey demonstrates further chemical diversity in low-mass star-forming regions.

Abstract Copyright:

Journal keyword(s): ISM: individual: R CrA IRS7B - ISM: molecules

Simbad objects: 26

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Number of rows : 26
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3049 2
2 NAME W 3 IRS 5 Cluster Cl* 02 25 42 +62 06.1           ~ 77 1
3 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 421 3
4 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 640 1
5 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
6 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
7 NAME Per Region reg 03 37 00.0 +31 15 00           ~ 242 0
8 LDN 1527 DNe 04 39 53 +25 45.0           ~ 539 0
9 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3772 0
10 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1450 0
11 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1073 2
12 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2098 1
13 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 773 0
14 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2205 0
15 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 140 0
16 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 710 1
17 HD 147889 Y*O 16 25 24.3162969787 -24 27 56.570239619 8.56 8.73 7.90     B2III/IV 449 1
18 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3219 1
19 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1113 1
20 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2033 1
21 [HHM93] A2 PoC 19 01 53.7 -36 57 38           ~ 4 0
22 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 91 2
23 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 83 1
24 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 104 1
25 HH 375 Y*O 20 39 06.2 +68 02 15           ~ 170 0
26 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 648 0

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2021.09.26-04:50:43

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