Identifying the counterpart of HESS J1858+020

Details Identifying the counterpart of HESS J1858+020 Identifying the counterpart of HESS J1858+020

2009-12-14

arxiv.org/abs/0912.2669v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 3 figures, accepted for publication in A&A Letter

Scientific paper

HESS J1858+020 is a weak gamma-ray source that does not have any clear cataloged counterpart at any wavelengths. Recently, the source G35.6-0.4 was re-identified as a SNR. The HESS source lies towards the southern border of this remnant. The purpose of this work is to investigate the interstellar medium around the mentioned sources in order to look for possible counterparts of the very-high energy emission. Using the 13CO J=1-0 line from the Galactic Ring Survey and mid-IR data from GLIMPSE we analyze the environs of HESS J1858+020 and SNR G35.6-0.4. The 13CO data show the presence of a molecular cloud towards the southern border of SNR G35.6-0.4 and at the same distance as the remnant. This cloud is composed by two molecular clumps, one, over the SNR shell and the other located at the center of HESS J1858+020. We estimate a molecular mass and a density of ~ 5 X 10^{3} Msun and ~ 500 cm^{-3}, respectively for each clump. Considering the gamma-ray flux observed towards HESS J1858+020, we estimate that a molecular cloud with a density of at least 150 cm^{-3} could explain the very-high energy emission hadronically. Thus, we suggest that the gamma-ray emission detected in HESS J1858+020 is due to hadronic mechanism. Additionally, analyzing mid-IR emission, we find that the region is active in star formation, which could be considered as an alternative or complementary possibility to explain the very-high energy emission.

Affiliated with

Also associated with

No associations

Rating

Identifying the counterpart of 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 Identifying the counterpart of HESS J1858+020, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Identifying the counterpart of HESS J1858+020 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-624819