Artículo
Abstract:
Aims. The main goal of this paper is to provide new insights on the origin of the observable flux of γ rays from HESS J1809-193 using new high-quality observations in the radio domain. Methods. We used the Expanded Very Large Array (now known as the Karl G. Jansky Very large Array, JVLA) to produce a deep full-synthesis imaging at 1.4 GHz of the vicinity of PSR J1809-1917. These data were used in conjunction with 12CO observations from the James Clerk Maxwell Telescope in the transition line J = 3-2 and atomic hydrogen data from the Southern Galactic Plane Survey to investigate the properties of the interstellar medium in the direction of the source HESS J1809-193. Results. The new radio continuum image, obtained with a synthesized beam of 8′′ × 4′′ and a sensitivity of 0.17 mJy beam-1, reveals with unprecedented detail all the intensity structures in the field. No radio counterpart to the observed X-ray emission supposed to be a pulsar wind nebula powered by PSR J1809-1917 is seen in the new JVLA image. We discovered a system of molecular clouds on the edge of the supernova remnant (SNR) G11.0-0.0 shock front, which is positionally coincident with the brightest part of the TeV source HESS J1809-193. We determine, on the basis of kinematic and morphological evidences, a physical link of the SNR with the clouds for which we estimated a total (molecular plus atomic) mass of ~3 × 103M⊙ and a total proton density in the range 2-3 × 103 cm-3. Conclusions. We propose as the most likely origin of the very high-energy γ-ray radiation from HESS J1809-193 a hadronic mechanism through collisions of ions accelerated at the SNR G11.0-0.0 shock with the molecular matter in the vicinity of the remnant. © 2016 ESO.
Registro:
| Documento: | Artículo |
| Título: | Unveiling the origin of HESS J1809-193 |
| Autor: | Castelletti, G.; Giacani, E.; Petriella, A. |
| Filiación: | Instituto de Astronomiá y Física Del Espacio (IAFE), UBA-CONICET, Suc. 28, Buenos Aires, 1428, Argentina FADU, University of Buenos Aires, Buenos Aires, 1053, Argentina CBC, University of Buenos Aires, Buenos Aires, 1053, Argentina |
| Palabras clave: | ISM: clouds; ISM: supernova remnants; Radio continuum: ISM; Image processing; Supernovae; Tellurium compounds; Galactic plane surveys; Gamma ray radiation; Intensity structure; Interstellar mediums; ISM : clouds; ISM: supernova remnants; James Clerk Maxwell Telescope; Radio continuum: ISM; Gamma rays |
| Año: | 2016 |
| Volumen: | 587 |
| DOI: | http://dx.doi.org/10.1051/0004-6361/201527578 |
| 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_v587_n_p_Castelletti |
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Citas:
---------- APA ----------
Castelletti, G., Giacani, E. & Petriella, A. (2016) . Unveiling the origin of HESS J1809-193. Astronomy and Astrophysics, 587.http://dx.doi.org/10.1051/0004-6361/201527578
---------- CHICAGO ----------
Castelletti, G., Giacani, E., Petriella, A. "Unveiling the origin of HESS J1809-193" . Astronomy and Astrophysics 587 (2016).http://dx.doi.org/10.1051/0004-6361/201527578
---------- MLA ----------
Castelletti, G., Giacani, E., Petriella, A. "Unveiling the origin of HESS J1809-193" . Astronomy and Astrophysics, vol. 587, 2016.http://dx.doi.org/10.1051/0004-6361/201527578
---------- VANCOUVER ----------
Castelletti, G., Giacani, E., Petriella, A. Unveiling the origin of HESS J1809-193. Astron. Astrophys. 2016;587.http://dx.doi.org/10.1051/0004-6361/201527578
