Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations
LS 5039 is a gamma-ray binary displaying synchrotron emission at GHz radio frequencies with a small variability and without signatures of being orbitally modulated. A detailed study in the 0.15–15 GHz range has been carried out by analyzing VLA, GMRT and WSRT observations, obtaining an average spect...
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2015
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/167939 |
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I19-R120-10915-167939 |
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I19-R120-10915-1679392024-07-11T20:03:11Z http://sedici.unlp.edu.ar/handle/10915/167939 Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations Marcote, Benito Ribó, Marc Paredes, Josep Maria Ishwara-Chandra, C. H. 2015-10 2016 2024-07-11T13:05:43Z en Ciencias Astronómicas gamma-ray binary radio emission physical properties LS 5039 is a gamma-ray binary displaying synchrotron emission at GHz radio frequencies with a small variability and without signatures of being orbitally modulated. A detailed study in the 0.15–15 GHz range has been carried out by analyzing VLA, GMRT and WSRT observations, obtaining an average spectrum and two quasi-simultaneous spectra. We have observed a persistent radio emission on day, week and year timescales, with a variability below 25% and with no signatures of orbital modulation at all frequencies except at 150 MHz, where the source remains undetected. The spectra reveal a power-law emission at high frequencies (& 1 GHz) and a turnover at about 0.5 GHz. We explain these spectra with a simple model of one-zone synchrotron emitting region. Synchrotron self-absorption and Razin effect explain the absorption at low frequencies (.1 GHz). With this model we have obtained an estimate of the physical properties of the radio emitting region of LS 5039, and derived a high mixing of the stellar wind within the relativistic plasma of the radio outflow. Facultad de Ciencias Astronómicas y Geofísicas Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 67-82 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas gamma-ray binary radio emission physical properties |
| spellingShingle |
Ciencias Astronómicas gamma-ray binary radio emission physical properties Marcote, Benito Ribó, Marc Paredes, Josep Maria Ishwara-Chandra, C. H. Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations |
| topic_facet |
Ciencias Astronómicas gamma-ray binary radio emission physical properties |
| description |
LS 5039 is a gamma-ray binary displaying synchrotron emission at GHz radio frequencies with a small variability and without signatures of being orbitally modulated. A detailed study in the 0.15–15 GHz range has been carried out by analyzing VLA, GMRT and WSRT observations, obtaining an average spectrum and two quasi-simultaneous spectra. We have observed a persistent radio emission on day, week and year timescales, with a variability below 25% and with no signatures of orbital modulation at all frequencies except at 150 MHz, where the source remains undetected. The spectra reveal a power-law emission at high frequencies (& 1 GHz) and a turnover at about 0.5 GHz. We explain these spectra with a simple model of one-zone synchrotron emitting region. Synchrotron self-absorption and Razin effect explain the absorption at low frequencies (.1 GHz). With this model we have obtained an estimate of the physical properties of the radio emitting region of LS 5039, and derived a high mixing of the stellar wind within the relativistic plasma of the radio outflow. |
| format |
Objeto de conferencia Objeto de conferencia |
| author |
Marcote, Benito Ribó, Marc Paredes, Josep Maria Ishwara-Chandra, C. H. |
| author_facet |
Marcote, Benito Ribó, Marc Paredes, Josep Maria Ishwara-Chandra, C. H. |
| author_sort |
Marcote, Benito |
| title |
Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations |
| title_short |
Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations |
| title_full |
Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations |
| title_fullStr |
Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations |
| title_full_unstemmed |
Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations |
| title_sort |
physical properties of the gamma-ray binary ls 5039 through low and high frequency radio observations |
| publishDate |
2015 |
| url |
http://sedici.unlp.edu.ar/handle/10915/167939 |
| work_keys_str_mv |
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