2018A&A...614A.112L


Query : 2018A&A...614A.112L

2018A&A...614A.112L - Astronomy and Astrophysics, volume 614A, 112-112 (2018/6-1)

Interstellar bromine abundance is consistent with cometary ices from Rosetta.

LIGTERINK N.F.W. and KAMA M.

Abstract (from CDS):


Context. Cometary ices are formed during star and planet formation, and their molecular and elemental makeup can be related to the early solar system via the study of inter- and protostellar material.
Aims. We set out to place the first observational constraints on the interstellar gas-phase abundance of bromine (Br). We further aim to compare the protostellar Br abundance with that measured by Rosetta in the ices of comet 67P/Churyumov-Gerasimenko.
Methods. Archival Herschel data of Orion KL, Sgr B2(N), and NGC 6334I are examined for the presence of HBr and HBr+ emission or absorption lines. A chemical network for modelling HBr in protostellar molecular gas is compiled to aid in the interpretation.
Results. HBr and HBr+ were not detected towards any of our targets. However, in the Orion KL Hot Core, our upper limit on HBr/H2O is a factor of ten below the ratio measured in comet 67P. This result is consistent with the chemical network prediction that HBr is not a dominant gas-phase Br carrier. Cometary HBr is likely predominantly formed in icy grain mantles which lock up nearly all elemental Br.

Abstract Copyright: © ESO 2018

Journal keyword(s): astrochemistry - techniques: spectroscopic - molecular processes - stars: protostars - ISM: molecules

Simbad objects: 4

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Number of rows : 4
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 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2091 1
2 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 287 0
3 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 565 1
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2020 1

    Equat.    Gal    SGal    Ecl

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2021.07.27-07:44:30

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