Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-03-29
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
11 pages, 5 figures. Accepted for publication in A&A (March 25, 2011)
Scientific paper
HESS J1858+020 is a weak gamma-ray source lying near the southern border of the SNR G35.6-0.4. A molecular cloud, composed by two clumps, shows signs of interaction with the SNR and with a nearby extended HII region. In particular, the southernmost clump coincides with the center of the HESS source. In this work we study this clump in detail with the aim of adding information that helps in the identification of the nature of the very-high energy emission. We observed the mentioned molecular clump using the Atacama Submillimeter Telescope Experiment (ASTE) in the 12CO J=3-2, 13CO J=3-2, HCO+ J=4-3 and CS J=7-6 lines with an angular resolution of 22". To complement this observations we analyzed IR and submillimeter continuum archival data. From the 12CO and 13CO J=3-2 lines and the 1.1 mm continuum emission we derived a density of between 10^{3} and 10^{4} cm^-3 for the clump. We discovered a young stellar object (YSO), probably a high mass protostar, embedded in the molecular clump. However, we did not observe any evidence of molecular outflows from this YSO which would reveal the presence of a thermal jet capable of generating the observed gamma-rays. We conclude that the most probable origin for the TeV gamma-ray emission are the hadronic interactions between the molecular gas and the cosmic rays accelerated by the shock front of the SNR G35.6-0.4.
Dubner Gloria
Giacani Elsa
Paron Sergio
Rubio M'onica
No associations
LandOfFree
Study of the molecular clump associated with the high-energy source HESS J1858+020 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Study of the molecular clump associated with the high-energy source HESS J1858+020, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of the molecular clump associated with the high-energy source HESS J1858+020 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-164423