First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465

Mostrar todas las versiones(3)

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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Castelletti, G., Giacani, E., Dubner, G., Joshi, B.C., Rao, A.P., Terrier, R.
Formato: JOUR
Materias:
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
Molecular gas
Molecular materials
Multi frequency
Optical depth
Pulsar wind nebula
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v536_n_p_Castelletti
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v536_n_p_Castelletti
record_format dspace
spelling todo:paper_00046361_v536_n_p_Castelletti2023-10-03T14:00:38Z First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465 Castelletti, G. Giacani, E. Dubner, G. Joshi, B.C. Rao, A.P. Terrier, R. 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 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. Fil:Castelletti, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Giacani, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Dubner, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v536_n_p_Castelletti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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
topic_facet 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
description 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.
format JOUR
author Castelletti, G.
Giacani, E.
Dubner, G.
Joshi, B.C.
Rao, A.P.
Terrier, R.
author_facet Castelletti, G.
Giacani, E.
Dubner, G.
Joshi, B.C.
Rao, A.P.
Terrier, R.
author_sort Castelletti, G.
title First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465
title_short First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465
title_full First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465
title_fullStr First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465
title_full_unstemmed First high-resolution radio study of the supernova remnant G338.3-0.0 associated with the gamma-ray source HESS J1640-465
title_sort first high-resolution radio study of the supernova remnant g338.3-0.0 associated with the gamma-ray source hess j1640-465
url http://hdl.handle.net/20.500.12110/paper_00046361_v536_n_p_Castelletti
work_keys_str_mv AT castellettig firsthighresolutionradiostudyofthesupernovaremnantg338300associatedwiththegammaraysourcehessj1640465
AT giacanie firsthighresolutionradiostudyofthesupernovaremnantg338300associatedwiththegammaraysourcehessj1640465
AT dubnerg firsthighresolutionradiostudyofthesupernovaremnantg338300associatedwiththegammaraysourcehessj1640465
AT joshibc firsthighresolutionradiostudyofthesupernovaremnantg338300associatedwiththegammaraysourcehessj1640465
AT raoap firsthighresolutionradiostudyofthesupernovaremnantg338300associatedwiththegammaraysourcehessj1640465
AT terrierr firsthighresolutionradiostudyofthesupernovaremnantg338300associatedwiththegammaraysourcehessj1640465
_version_ 1782028463182446592

Ejemplares similares