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On the origin of the X-ray emission from a narrow-line radio quasar at z > 1

AuthorsBarcons, Xavier ; Carballo, R.; Carrera, Francisco J. ; Ceballos, María Teresa ; González-Serrano, José Ignacio ; Paredes, J. M.; Ribó, M.; Warwick, R. S.
KeywordsGalaxies: active
X-rays: galaxies
Issue Date2003
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 343(1): 137-142 (2003)
AbstractWe present new XMM-Newton X-ray observations of the z = 1.246 narrow-line radio quasar RX J1011.2+5545 serendipitously discovered by ROSAT. The flat X-ray spectrum previously measured by ROSAT and ASCA is shown to be the result of a steep F ∼ 1.8 power-law spectrum seen through a moderate intrinsic absorbing column (NH ∼ 4 × 1021 cm -2). The position of the X-ray source is entirely coincident with the nucleus of the radio source that we have resolved in new sensitive VLA observations at 3.6 and 6 cm, implying that scattering in the radio lobes is not responsible for the bulk of X-ray emission. In the EPIC pn image, a faint patch of X-ray emission is apparent 14 arcsec to the north-east of the main X-ray source. The former is positionally coincident with an apparently extended optical object with R ∼21.9, but there is no associated radio emission, thus ruling out the possibility that this represents a hotspot in a jet emanating from the primary X-ray source. No reflection features are detected in the X-ray spectrum of the narrow-line radio quasar, although an Fe line with an equivalent width of up to 600 eV cannot be ruled out.
Publisher version (URL)https://doi.org/10.1046/j.1365-8711.2003.06652.x
Identifiersdoi: 10.1046/j.1365-8711.2003.06652.x
issn: 0035-8711
e-issn: 1365-2966
Appears in Collections:(IFCA) Artículos
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