2011A&A...530A..25P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST10:33:07

2011A&A...530A..25P - Astronomy and Astrophysics, volume 530A, 25-25 (2011/6-1)

Study of the molecular clump associated with the high-energy source HESS J1858+020.

PARON S., GIACANI E., RUBIO M. and DUBNER G.

Abstract (from CDS):

HESS J1858+020 is a weak γ-ray source lying near the southern border of the SNR G35.6-0.4. A molecular cloud, composed of two clumps, shows signs of interaction with both the SNR and a nearby extended HII region. In particular, the southernmost clump coincides with the center of the H.E.S.S. source. We study this clump in detail to help us identify the nature of the very-high energy emission. We observed the aforementioned molecular clump using the Atacama Submillimeter Telescope Experiment (ASTE) in the J=3-2, J=3-2, HCO+ J=4-3, and CS J=7-6 lines with an angular resolution of 22''. To complement these observations, we analyzed IR and submillimeter continuum archival data.From the and J=3-2 lines and the 1.1mm continuum emission, we derive a density of between 103 and 104cm–3 for the clump. We discover a young stellar object (YSO), probably a high mass protostar, embedded in the molecular clump. However, we do not find any evidence of molecular outflows from this YSO that would represent a thermal jet capable of generating the observed γ-rays. We conclude that the most probable origin of the TeV γ-ray emission is a hadronic interaction between the molecular gas and the cosmic rays accelerated by the shock front of the SNR G35.6-0.4.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: supernova remnants - gamma rays: ISM - ISM: individual objects: HESS J1858+020

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Auriga reg 04 20 00.0 +38 05 00           ~ 162 0
2 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3306 0
3 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10997 0
4 SNR G035.6-00.4 Rad 18 57 55 +02 13.0           ~ 32 1
5 [ERG2015] 6310 cor 18 58 13.8710 +02 07 25.204           ~ 8 0
6 HESS J1858+020 gam 18 58 20.0 +02 05 24           ~ 33 0
7 BGPS G035.576-00.584 mm 18 58 20.6529 +02 05 12.130           ~ 4 0
8 IRAS 18558+0201 * 18 58 21.13 +02 05 16.0           ~ 1 0
9 2MASS J18582116+0205098 IR 18 58 21.163 +02 05 09.88           ~ 2 0
10 2MASS J18582214+0205010 IR 18 58 22.147 +02 05 01.02           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2019.10.16-10:33:07

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