X‐ray emission from GPS and CSS sources

Abstract

Many X-ray observations of GigaHertz Peaked Spectrum and Compact Steep Spectrum sources have been made with Chandra X-ray Observatory and XMM-Newton Observatory over the last few years. The X-ray spectra contribute the important information to the total energy distribution of the compact radio sources. In addition the spatial resolution of Chandra allows for studies of the X-ray morphology of these sources on arcsec scales and provide a direct view of their environments. This paper gives a review of the current status of the X-ray observations and their contribution to our understanding of the nature of these compact radio sources. It also describes primary physical processes that lead to the observed X-ray emission and summarize X-ray emission properties expected from interactions between an expanding radio source and the intergalactic environment.

Hi absorption in nearby compact radio galaxies

“…Siemiginowska et al 2008;Siemiginowska 2009;Ostorero et al 2010;Ostorero et al 2016, Moss et al, in prep. ).…”

NH‐NHI correlation in gigahertz‐peaked‐spectrum galaxies

“…Although they are increasingly detected in the X-ray domain (O'Dea et al 2000;Risaliti et al 2003;Guainazzi et al 2004Guainazzi et al , 2006Vink et al 2006;Siemiginowska et al 2008;Tengstrand et al 2009), the best angular resolution currently available (∼1 ′′ with Chandra) is not sufficient to resolve the X-ray morphology of most GPS/CSOs. Therefore, the origin of their X-ray emission is still matter of debate (e.g., Siemiginowska et al 2009;Migliori 2015).…”

Correlation between X-Ray and Radio Absorption in Compact Radio Galaxies

“…Xrays in GPS/CSOs have been proposed to be thermal emission from the ISM shocked by the expanding radio lobes (Heinz et al 1998;O'Dea et al 2000), thermal Comptonization emission from the disc corona (Guainazzi et al 2004;Vink et al 2006;Guainazzi et al 2006;Siemiginowska et al 2008Siemiginowska et al , 2016Tengstrand et al 2009), or non-thermal emission of compact lobes produced through inverse-Compton scattering of the local radiation fields (Stawarz et al 2008;Ostorero et al 2010;Siemiginowska et al 2016). All these thermal and non-thermal components are, in fact, likely to contribute to the total X-ray emission of compact radio galaxies, but they are difficult to disentangle (Siemiginowska 2009;Siemiginowska et al 2016;Tengstrand et al 2009). …”