The X-ray view of giga-hertz peaked spectrum radio galaxies

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The X-ray view of giga-hertz peaked spectrum radio galaxies

Tengstrand, Olof (author): Linköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan

Guainazzi, M. (author): ESA

Siemiginowska, A. (author): Harvard Smithsonian Centre for Astrophysics

Fonseca Bonilla, N. (author): ESA

Labiano, A. (author): CSIC

M. Worrall, D. (author): University of Bristol

Grandi, P. (author): INAF

Piconcelli, E. (author): INAF

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(creator_code:org_t)

2009-04-29
2009
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 501:1, s. 89-102

Related links:: https://www.aanda.or...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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.

Keyword

galaxies: jets; galaxies: active; X-rays: galaxies
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By the author/editor: Tengstrand, Olof; Guainazzi, M.; Siemiginowska, A ...; Fonseca Bonilla, ...; Labiano, A.; M. Worrall, D.; show more...; Grandi, P.; Piconcelli, E.; show less...

Articles in the publication: Astronomy and As ...

By the university: Linköping University

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