Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies

Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies

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 supernova remnant (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.

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Main Authors: Borka,D., Borka Jovanović,V., Urošević,D.
Format: Digital revista
Language:English
Published: Universidad Nacional Autónoma de México, Instituto de Astronomía 2012
Online Access:http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0185-11012012000100005
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spelling oai:scielo:S0185-110120120001000052013-05-28Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequenciesBorka,D.Borka Jovanović,V.Urošević,D. ISM/individual objects (HB 21) radiation mechanisms/non-thermal radiation mechanisms/thermal radio continuum/general surveys 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 supernova remnant (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.info:eu-repo/semantics/openAccessUniversidad Nacional Autónoma de México, Instituto de AstronomíaRevista mexicana de astronomía y astrofísica v.48 n.1 20122012-04-01info:eu-repo/semantics/articletext/htmlhttp://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0185-11012012000100005en
institution SCIELO
collection OJS
country México
countrycode MX
component Revista
access En linea
databasecode rev-scielo-mx
tag revista
region America del Norte
libraryname SciELO
language English
format Digital
author Borka,D.
Borka Jovanović,V.
Urošević,D.
spellingShingle Borka,D.
Borka Jovanović,V.
Urošević,D.
Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies
author_facet Borka,D.
Borka Jovanović,V.
Urošević,D.
author_sort Borka,D.
title Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies
title_short Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies
title_full Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies
title_fullStr Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies
title_full_unstemmed Spectra of the HB 21 supernova remnant: Evidence of sprectrum flattening at the low frequencies
title_sort spectra of the hb 21 supernova remnant: evidence of sprectrum flattening at the low frequencies
description 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 supernova remnant (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.
publisher Universidad Nacional Autónoma de México, Instituto de Astronomía
publishDate 2012
url http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0185-11012012000100005
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AT borkajovanovicv spectraofthehb21supernovaremnantevidenceofsprectrumflatteningatthelowfrequencies
AT urosevicd spectraofthehb21supernovaremnantevidenceofsprectrumflatteningatthelowfrequencies
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