2006A&A...446...87G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST17:30:54

2006A&A...446...87G - Astronomy and Astrophysics, volume 446, 87-96 (2006/1-4)

A hard X-ray view of giga-hertz peaked spectrum radio galaxies.

GUAINAZZI M., SIEMIGINOWSKA A., STANGHELLINI C., GRANDI P., PICONCELLI E. and AZUBIKE UGWOKE C.

Abstract (from CDS):

We present the first broadband X-ray observations of four Giga-Hertz Peaked Spectrum (GPS) radio galaxies at redshift ≲1 performed by Chandra and XMM-Newton. These observations more than double the number of members of this class with measured spectra in hard (E>2 keV) X-rays. All sources were detected. Their radio-to-X-ray spectral energy distributions are similar, except for PKS 0941-080, which is X-ray under-luminous by about two orders of magnitude. The comparison between the full sample of GPS galaxies with measurements in hard X-rays and a control sample of radio galaxies rules out intrinsic X-ray weakness as causing a lower detection rate of GPS sources in X-ray surveys. Four out of seven GPS galaxies exhibit high X-ray column densities, whereas for the remaining three this measurement is hampered by the poor spectral statistics. Bearing in mind the low number statistics in both the GPS and the control sample, the average column density measured in GPS galaxies is larger than in FR I or Broad Line Region FR II radio galaxies, but consistent with that measured in High-Excitation FR II galaxies. This leads to a location the absorbing gas in an obscuring ``torus'', which prevents us from observing the nuclear region along lines-of-sight perpendicular to the radio axis. This interpretation is supported by the discovery of rapid (timescale∼103s) X-ray variability in the GPS galaxy COINSJ0029+3456, and by an almost order-of-magnitude difference between the HI column density measured in radio and X-rays in PKS 0500+019.

Abstract Copyright:

Journal keyword(s): galaxies: jets - galaxies: quasars: individual: COINSJ0029+3456, PKS 0500+019, PKS 0941-080, PKS 2128+048 - X-ray: galaxies

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ICRF J002914.2+345632 AGN 00 29 14.24246572 +34 56 32.2471186   20.2       ~ 122 1
2 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1181 2
3 ICRF J050321.1+020304 Sy2 05 03 21.1971480 +02 03 04.676648   22.500 21.350 20.682   ~ 180 1
4 3C 186 QSO 07 44 17.4723761217 +37 53 17.249506697   17.5 18.14 17.2   ~ 288 1
5 ICRF J083454.9+553421 Sy2 08 34 54.90395243 +55 34 21.0703658   20.75 19.45 17.180   ~ 260 2
6 ICRF J094336.9-081930 LIN 09 43 36.9444590 -08 19 30.818298   19.401   18.100   ~ 112 2
7 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 540 3
8 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 699 2
9 ICRF J213032.8+050217 AG? 21 30 32.87739291 +05 02 17.4741657     23.4     ~ 150 1

    Equat.    Gal    SGal    Ecl

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2021.05.16-17:30:54

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