Artículo
Abstract:
Aims. 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. Methods. We observed the aforementioned 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 these observations, we analyzed IR and submillimeter continuum archival data. Results. From the 12CO and 13CO J = 3-2 lines and the 1.1 mm continuum emission, we derive a density of between 103 and 4 cm-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. © 2011 ESO.
Registro:
| Documento: | Artículo |
| Título: | Study of the molecular clump associated with the high-energy source HESS J1858+020 |
| Autor: | Paron, S.; Giacani, E.; Rubio, M.; Dubner, G. |
| Filiación: | Instituto de Astronomía y Física Del Espacio, CONICET-UBA, CC 67, Suc. 28, 1428 Buenos Aires, Argentina FADU, Universidad de Buenos Aires, Argentina Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile |
| Palabras clave: | gamma rays: ISM; ISM: clouds; ISM: individual objects: HESS J1858+020; ISM: supernova remnants; A-density; A-thermal; Angular resolution; Archival data; Atacama; Continuum emission; H II regions; Hadronic interactions; High energy emission; High-energy sources; ISM: clouds; ISM: individual objects; ISM: supernova remnants; Molecular clouds; Molecular clumps; Molecular gas; Molecular outflows; Protostars; Shock fronts; Submillimeters; Young stellar objects; Clouds; High energy physics; Stars; Tellurium compounds; Gamma rays |
| Año: | 2011 |
| Volumen: | 530 |
| DOI: | http://dx.doi.org/10.1051/0004-6361/201016390 |
| Título revista: | Astronomy and Astrophysics |
| Título revista abreviado: | Astron. Astrophys. |
| ISSN: | 00046361 |
| CODEN: | AAEJA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v530_n_p_Paron |
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Citas:
---------- APA ----------
Paron, S., Giacani, E., Rubio, M. & Dubner, G. (2011) . Study of the molecular clump associated with the high-energy source HESS J1858+020. Astronomy and Astrophysics, 530.http://dx.doi.org/10.1051/0004-6361/201016390
---------- CHICAGO ----------
Paron, S., Giacani, E., Rubio, M., Dubner, G. "Study of the molecular clump associated with the high-energy source HESS J1858+020" . Astronomy and Astrophysics 530 (2011).http://dx.doi.org/10.1051/0004-6361/201016390
---------- MLA ----------
Paron, S., Giacani, E., Rubio, M., Dubner, G. "Study of the molecular clump associated with the high-energy source HESS J1858+020" . Astronomy and Astrophysics, vol. 530, 2011.http://dx.doi.org/10.1051/0004-6361/201016390
---------- VANCOUVER ----------
Paron, S., Giacani, E., Rubio, M., Dubner, G. Study of the molecular clump associated with the high-energy source HESS J1858+020. Astron. Astrophys. 2011;530.http://dx.doi.org/10.1051/0004-6361/201016390
