SPECTRA OF THE HB 21 SUPERNOVA REMNANT: EVIDENCE OF SPECTRUM FLATTENING AT THE LOW FREQUENCIES
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
2012
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| _version_ | 1876426332890464256 |
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| author | D. Borka |
| author_facet | D. Borka |
| contents | SPECTRA OF THE HB 21 SUPERNOVA REMNANT: EVIDENCE OF SPECTRUM FLATTENING AT THE LOW FREQUENCIES D. Borka V. Borka Jovanovic D. Urosevic Física, Astronomía y Matemáticas thermal surveys radio continuum: general radiation mechanisms: non radiation mechanisms: thermal We use observations of the continuum radio emission at 1420, 820, 408, 34.5 and 22 MHz to estimate the mean brightness temperatures of the HB 21 supernovaremnant (SNR) at five frequencies. We also present mean spectral index of HB 21. The spectra of HB 21 are estimated from mean temperatures versus frequency plots for 1420, 820, 408, 34.5 and 22 MHz. We also present T -T plots of three frequency pairs: between 1420-34.5, 1420-22, 34.5-22 MHz. We notice flatter spectral indices at frequencies below 408 MHz. Probably this is due to the absorption by thermal plasma at low frequencies. 2012 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57124416005 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.48 |
| format | Artículo científico |
| id | redalyc_57124416005 |
| institution | Redalyc |
| language | en |
| publishDate | 2012 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | SPECTRA OF THE HB 21 SUPERNOVA REMNANT: EVIDENCE OF SPECTRUM FLATTENING AT THE LOW FREQUENCIES D. Borka Física, Astronomía y Matemáticas thermal surveys radio continuum: general radiation mechanisms: non radiation mechanisms: thermal SPECTRA OF THE HB 21 SUPERNOVA REMNANT: EVIDENCE OF SPECTRUM FLATTENING AT THE LOW FREQUENCIES D. Borka V. Borka Jovanovic D. Urosevic Física, Astronomía y Matemáticas thermal surveys radio continuum: general radiation mechanisms: non radiation mechanisms: thermal We use observations of the continuum radio emission at 1420, 820, 408, 34.5 and 22 MHz to estimate the mean brightness temperatures of the HB 21 supernovaremnant (SNR) at five frequencies. We also present mean spectral index of HB 21. The spectra of HB 21 are estimated from mean temperatures versus frequency plots for 1420, 820, 408, 34.5 and 22 MHz. We also present T -T plots of three frequency pairs: between 1420-34.5, 1420-22, 34.5-22 MHz. We notice flatter spectral indices at frequencies below 408 MHz. Probably this is due to the absorption by thermal plasma at low frequencies. 2012 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57124416005 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.48 |
| title | SPECTRA OF THE HB 21 SUPERNOVA REMNANT: EVIDENCE OF SPECTRUM FLATTENING AT THE LOW FREQUENCIES |
| topic | Física, Astronomía y Matemáticas thermal surveys radio continuum: general radiation mechanisms: non radiation mechanisms: thermal |
| url | https://www.redalyc.org/articulo.oa?id=57124416005 |