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The X-ray view of g...
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Tengstrand, OlofLinköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan
(author)
The X-ray view of giga-hertz peaked spectrum radio galaxies
- Article/chapterEnglish2009
Publisher, publication year, extent ...
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2009-04-29
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EDP Sciences,2009
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:liu-55100
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-55100URI
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https://doi.org/10.1051/0004-6361/200811284DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Context. This paper presents the X-ray properties of a flux- and volume-limited complete sample of 16 giga-hertz peaked spectrum (GPS) galaxies. Aims. This study addresses three basic questions in our understanding of the nature and evolution of GPS sources: a) What is the physical origin of the X-ray emission in GPS galaxies? b) Which physical system is associated with the X-ray obscuration? c) What is the "endpoint" of the evolution of compact radio sources? Methods. We discuss in this paper the results of the X-ray spectral analysis, and compare the X-ray properties of the sample sources with radio observables. Results. We obtain a 100% (94%) detection fraction in the 0.5-2 keV (0.5-10 keV) energy band. GPS galaxy X-ray spectra are typically highly obscured (less than N-H(GPS)greater than = 3 x 10(22) cm(-2); sigma(NH) similar or equal to 0.5 dex). The X-ray column density is larger than the HI column density measured in the radio by a factor 10 to 100. GPS galaxies lie well on the extrapolation to high radio powers of the correlation between radio and X-ray luminosity known in low-luminosity FR I radio galaxies. On the other hand, GPS galaxies exhibit a comparable X-ray luminosity to FR II radio galaxies, notwithstanding their much larger radio luminosity. Conclusions. The X-ray to radio luminosity ratio distribution in our sample is consistent with the bulk of the high-energy emission being produced by the accretion disk, as well as with dynamical models of GPS evolution where X-rays are produced by Compton upscattering of ambient photons. Further support to the former scenario comes from the location of GPS galaxies in the X-ray to O[III] luminosity ratio versus N-H plane. We propose that GPS galaxies are young radio sources, which would reach their full maturity as classical FR II radio galaxies. However, column densities greater than or similar to 10(22) cm(-2) could lead to a significant underestimate of dynamical age determinations based on the hotspot recession velocity measurements.
Subject headings and genre
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galaxies: jets; galaxies: active; X-rays: galaxies
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MEDICINE
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MEDICIN
Added entries (persons, corporate bodies, meetings, titles ...)
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Guainazzi, M.ESA
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Siemiginowska, A.Harvard Smithsonian Centre for Astrophysics
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Fonseca Bonilla, N.ESA
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Labiano, A.CSIC
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M. Worrall, D.University of Bristol
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Grandi, P.INAF
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Piconcelli, E.INAF
(author)
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Linköpings universitetInstitutionen för fysik, kemi och biologi
(creator_code:org_t)
Related titles
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In:Astronomy and Astrophysics: EDP Sciences501:1, s. 89-1020004-63611432-0746
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