Identifying the counterpart of HESS J1858+020
Aims: HESS J1858+020 is a weak γ-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...
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2010
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v509_n1_p_Paron http://hdl.handle.net/20.500.12110/paper_00046361_v509_n1_p_Paron |
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paper:paper_00046361_v509_n1_p_Paron2023-06-08T14:27:52Z Identifying the counterpart of HESS J1858+020 Clouds - ISM Individual objects ISM ISM - ISM Supernova remnants - Gamma rays Clouds Elementary particles Signal to noise ratio Stars Clouds-ISM Individual objects ISM ISM - ISM Supernova remnants Gamma rays Aims: HESS J1858+020 is a weak γ-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 to look for possible counterparts of the very high energy emission. Methods: 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. Results. 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 of 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 × 103 M⊙ 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 γ-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. © ESO 2010. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v509_n1_p_Paron http://hdl.handle.net/20.500.12110/paper_00046361_v509_n1_p_Paron |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Clouds - ISM Individual objects ISM ISM - ISM Supernova remnants - Gamma rays Clouds Elementary particles Signal to noise ratio Stars Clouds-ISM Individual objects ISM ISM - ISM Supernova remnants Gamma rays |
spellingShingle |
Clouds - ISM Individual objects ISM ISM - ISM Supernova remnants - Gamma rays Clouds Elementary particles Signal to noise ratio Stars Clouds-ISM Individual objects ISM ISM - ISM Supernova remnants Gamma rays Identifying the counterpart of HESS J1858+020 |
topic_facet |
Clouds - ISM Individual objects ISM ISM - ISM Supernova remnants - Gamma rays Clouds Elementary particles Signal to noise ratio Stars Clouds-ISM Individual objects ISM ISM - ISM Supernova remnants Gamma rays |
description |
Aims: HESS J1858+020 is a weak γ-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 to look for possible counterparts of the very high energy emission. Methods: 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. Results. 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 of 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 × 103 M⊙ 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 γ-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. © ESO 2010. |
title |
Identifying the counterpart of HESS J1858+020 |
title_short |
Identifying the counterpart of HESS J1858+020 |
title_full |
Identifying the counterpart of HESS J1858+020 |
title_fullStr |
Identifying the counterpart of HESS J1858+020 |
title_full_unstemmed |
Identifying the counterpart of HESS J1858+020 |
title_sort |
identifying the counterpart of hess j1858+020 |
publishDate |
2010 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v509_n1_p_Paron http://hdl.handle.net/20.500.12110/paper_00046361_v509_n1_p_Paron |
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1768545718779248640 |