SCORPIO - II. Spectral indices of weak Galactic radio sources

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dc.contributor.authorCavallaro, F.
dc.contributor.authorTrigilio, C.
dc.contributor.authorUmana, G.
dc.contributor.authorFranzen, T.M.O.
dc.contributor.authorNorris, R.P.
dc.contributor.authorLeto, P.
dc.contributor.authorIngallinera, A.
dc.contributor.authorBuemi, C.S.
dc.contributor.authorMarvil, J.
dc.contributor.authorAgliozzo, C.
dc.contributor.authorBufano, F.
dc.contributor.authorCerrigone, L.
dc.contributor.authorRiggi, S.
dc.date.accessioned2019-04-23T13:39:13Z
dc.date.available2019-04-23T13:39:13Z
dc.date.issued2018-01
dc.descriptionIndexación: Scopus.es_ES
dc.description.abstractIn the next few years the classification of radio sources observed by the large surveys will be a challenging problem and spectral index is a powerful tool for addressing it. Here we present an algorithm to estimate the spectral index of sources from multiwavelength radio images. We have applied our algorithm to SCORPIO, a Galactic plane survey centred around 2.1 GHz carried out with Australian Telescope Compact Array and found we can measure reliable spectral indices only for sources stronger than 40 times the rms noise. Above a threshold of 1 mJy, the source density in SCORPIO is 20 per cent greater than in a typical extragalactic field, like Australia Telescope Large Area Survey because of the presence of Galactic sources. Among this excess population, 16 sources per square degree have a spectral index of about zero suggesting optically thin thermal emission such as H II regions and planetary nebulae, while 12 per square degree present a rising spectrum, suggesting optically thick thermal emission such as stars and UCH II regions. © 2017 The Author(s).es_ES
dc.description.urihttps://academic.oup.com/mnras/article/473/2/1685/4222618
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 473(2), pp. 1685-1694.es_ES
dc.identifier.issn0035-8711
dc.identifier.otherDOI: 10.1093/mnras/stx2445
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/8569
dc.language.isoenes_ES
dc.publisherOxford University Presses_ES
dc.subjectGalaxy: stellar contentes_ES
dc.subjectRadio continuum: galaxieses_ES
dc.subjectRadio continuum: ISMes_ES
dc.subjectRadio continuum: starses_ES
dc.subjectTechniques: interferometrices_ES
dc.titleSCORPIO - II. Spectral indices of weak Galactic radio sourceses_ES
dc.typeArtículoes_ES
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