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Abstract:

Aims. We perform a multifrequency radio study of the supernova remnant (SNR) G338.3-0.0, in positional coincidence with the TeV source HESS J1640 - 465. We study the morphological and spectral properties of this remnant and its surroundings searching for plausible radio counterparts to the gamma-ray emission. Methods. We observed the SNR G338.3-0.0 using the Giant Metrewave Radio Telescope (GMRT) at 235, 610, and 1280 MHz. We also reprocessed archival data from the Australia Telescope Compact Array (ATCA) at 1290 and 2300 MHz. We conducted a search for radio pulsations towards a central point-like source, using the GMRT antennas at 610 and 1280 MHz. The molecular material in the region of the SNR was investigated based on observations made with the NANTEN telescope in the 12CO (J = 1-0) emission line. Results. The new radio observations revealed a remnant with a bilateral morphology, which at 235 MHz has a western wing that is completely attenuated because of absorption caused by foreground ionized gas. The quality of these new images allows us to provide accurate estimates of the total radio flux density of the whole SNR at different radio frequencies. From both these new and existing flux density estimates between 235 MHz and 5000 MHz, we derived for the whole remnant a spectral index α = -0.51 ± 0.06 with a local free-free continuum optical depth at 235 MHz of τ 235 = 0.9 ± 0.3. No radio pulsations were detected towards the only radio point-like source within the HESS error circle. We derived upper limits of 2.0 mJy and 1.0 mJy at 610 MHz and 1280 MHz, respectively, for the pulsed flux towards this source. No radio counterpart was found for the pulsar wind nebula discovered in X-rays. The inspection of the interstellar molecular gas towards G338.3-0.0 and its surroundings indicates that there is no associated dense cloud that might explain a hadronic origin for the TeV detection. © ESO, 2011.

Registro:

Documento: Artículo
Título:First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465
Autor:Castelletti, G.; Giacani, E.; Dubner, G.; Joshi, B.C.; Rao, A.P.; Terrier, R.
Filiación:Instituto de Astronomía y Física Del Espacio (CONICET-UBA), CC 67, Suc. 28, 1428 Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Facultad de Arquitectura y Urbanismo, Universidad de Buenos Aires, Argentina
National Centre for Radio Astrophysics, Ganeshkhind, Pune 411007, India
APC-Univ. Denis Diderot Paris 7, 75265 Paris Cedex 13, France
Palabras clave:ISM: individual objects: G338.3-0.0; ISM: individual objects: HESS J1640-465; ISM: supernova remnants; Radio continuum: ISM; Archival data; Australia; Compact arrays; Emission lines; Flux densities; Gamma ray sources; Gamma-ray emission; Giant metrewave radio telescopes; High resolution; Ionized gas; ISM: individual objects; ISM: supernova remnants; Molecular gas; Molecular materials; Multi frequency; Optical depth; Pulsar wind nebula; Radio continuum: ISM; Radio flux; Radio frequencies; Radio observation; Spectral indices; Spectral properties; Supernova remnants; Upper limits; Associated gas; Atmospheric optics; Ionization of gases; Optical telescopes; Radio telescopes; Stars; Tellurium compounds; Gamma rays
Año:2011
Volumen:536
DOI: http://dx.doi.org/10.1051/0004-6361/201117516
Handle:http://hdl.handle.net/20.500.12110/paper_00046361_v536_n_p_Castelletti
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00046361_v536_n_p_Castelletti.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v536_n_p_Castelletti

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Citas:

---------- APA ----------
Castelletti, G., Giacani, E., Dubner, G., Joshi, B.C., Rao, A.P. & Terrier, R. (2011) . First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465. Astronomy and Astrophysics, 536.
http://dx.doi.org/10.1051/0004-6361/201117516
---------- CHICAGO ----------
Castelletti, G., Giacani, E., Dubner, G., Joshi, B.C., Rao, A.P., Terrier, R. "First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465" . Astronomy and Astrophysics 536 (2011).
http://dx.doi.org/10.1051/0004-6361/201117516
---------- MLA ----------
Castelletti, G., Giacani, E., Dubner, G., Joshi, B.C., Rao, A.P., Terrier, R. "First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465" . Astronomy and Astrophysics, vol. 536, 2011.
http://dx.doi.org/10.1051/0004-6361/201117516
---------- VANCOUVER ----------
Castelletti, G., Giacani, E., Dubner, G., Joshi, B.C., Rao, A.P., Terrier, R. First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465. Astron. Astrophys. 2011;536.
http://dx.doi.org/10.1051/0004-6361/201117516