2019ApJ...872..196S


Query : 2019ApJ...872..196S

2019ApJ...872..196S - Astrophys. J., 872, 196-196 (2019/February-3)

Implications of a hot atmosphere/corino from ALMA observations toward NGC 1333 IRAS 4A1.

SAHU D., LIU S.-Y., SU Y.-N., LI Z.-Y., LEE C.-F., HIRANO N. and TAKAKUWA S.

Abstract (from CDS):

We report high angular resolution observations of NGC 1333 IRAS 4A, a protostellar binary including A1 and A2, at 0.84 mm with the Atacama Large Millimeter/submillimeter Array. From the continuum observations, we suggest that the dust emission from the A1 core is optically thick, and A2 is predominantly optically thin. The A2 core, exhibiting a forest of spectral lines including complex molecules, is a well-known hot corino, as suggested by previous works. More importantly, we report, for the first time, solid evidence of complex organic molecules (COMs), including CH3OH, 13CH3OH, CH2DOH, and CH3CHO, associated with the A1 core seen in absorption. The absorption features mostly arise from a compact region around the continuum peak position of the A1 core. Rather than originating from a larger common envelope surrounding the protobinary, the COM features are associated with individual cores A1 and A2. Considering the signatures observed in both continuum and spectral lines, we propose two possible scenarios for IRAS 4A1: the COM absorption lines may arise from a hot-corino-like atmosphere at the surface of an optically thick circumstellar disk around A1, or the absorption may arise from different layers of a temperature-stratified, dense envelope.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrochemistry - ISM: abundances - ISM: individual objects: NGC 1333 IRAS 4A - ISM: molecules - stars: formation

Status at CDS : Examining the need for a new acronym.

Simbad objects: 8

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Number of rows : 8
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 [JCC87] IRAS 4A2 Y*O 03 29 10.413 +31 13 32.20           ~ 99 1
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 641 1
3 [JCC87] IRAS 4A1 Y*O 03 29 10.510 +31 13 31.01           ~ 88 1
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1155 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2099 1
6 V* V883 Ori Or* 05 38 18.0974260202 -07 02 25.963144400   14.80       F:I: 127 0
7 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 311 1
8 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1113 1

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2021.09.29-04:11:14

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