2003A&A...401..505G


Query : 2003A&A...401..505G

2003A&A...401..505G - Astronomy and Astrophysics, volume 401, 505-517 (2003/4-2)

Chandra observations of nuclear X-ray emission from a sample of radio sources.

GAMBILL J.K., SAMBRUNA R.M., CHARTAS G., CHEUNG C.C., MARASCHI L., TAVECCHIO F., URRY C.M. and PESCE J.E.

Abstract (from CDS):

We present the X-ray properties of a sample of 17 radio sources observed with the Chandra X-ray Observatory as part of a project aimed at studying the X-ray emission from their radio jets. In this paper, we concentrate on the X-ray properties of the unresolved cores. The sample includes 16 quasars (11 core-dominated and 5 lobe-dominated) in the redshift range z=0.30-1.96, and one low-power radio-galaxy at z=0.064. No diffuse X-ray emission is present around the cores of the quasars, except for the nearby low-power galaxy that has diffuse emission on a scale and with a luminosity consistent with other FRIs. No high-amplitude, short-term variability is detected within the relatively short Chandra exposures. However, 1510-089 shows low-amplitude flux changes with a timescale of ∼25min. The X-ray spectra of the quasar cores are generally well described by a single power law model with Galactic absorption. However, in six quasars we find soft X-ray excess emission below 1.6keV. Interestingly, we detect an Fe K-shell emission line, consistent with fluorescent Kα emission from cold iron, in one lobe- and two core-dominated sources. The average X-ray photon index for the quasars in the sample is Γsample=1.66 and dispersion σsample=0.23. The average spectral slope for our sample is flatter than the slope found for radio-quiet quasars and for radio-loud AGNs with larger jet orientations; this indicates that beaming affects the X-ray emission from the cores in our sample of quasars.

Abstract Copyright:

Journal keyword(s): galaxies: active - radio continuum: galaxies - galaxies: quasars: emission lines - X-rays: general

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 PKS 0405-123 Sy1 04 07 48.4309841856 -12 11 36.659928408   15.09 14.86 14.7   ~ 486 1
2 QSO B0605-0834 BLL 06 07 59.6994046176 -08 34 49.980131256     18.5 17.70   ~ 422 1
3 ICRF J072810.8+674847 Sy1 07 28 10.8959197752 +67 48 47.035805652     18.0     ~ 200 1
4 3C 191 QSO 08 04 47.9671662720 +10 15 23.746977252   18.65 18.40     ~ 275 2
5 2MASX J08400233+2949027 Sy2 08 40 02.336 +29 49 02.73   20.00 19.62     ~ 166 1
6 ICRF J084047.5+131223 Sy1 08 40 47.5881972768 +13 12 23.557974480   18.58 18.15 17.622   ~ 404 1
7 4C 12.37 QSO 10 42 44.6052783816 +12 03 31.263917976   18.03 17.77     ~ 416 2
8 4C 01.28 BLL 10 58 29.6054370384 +01 33 58.820502924   18.74 18.28 16.68   ~ 716 2
9 NAME Crt A Sy1 11 39 10.7025556152 -13 50 43.639196064   16.38 16.17 16.4   ~ 257 1
10 LB 2136 QSO 11 53 24.4668989616 +49 31 08.830641828   17.94 17.66     ~ 452 1
11 ICRF J135704.4+191907 Sy1 13 57 04.4366598768 +19 19 07.371837768   16.33 16.03 15.3   ~ 428 2
12 QSO J1512-0906 Bla 15 12 50.5330369584 -09 05 59.830296360   16.74 16.54     ~ 1236 1
13 4C 69.21 QSO 16 42 07.8484347528 +68 56 39.767837172   19.723   19.219   ~ 291 1
14 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1632 2
15 4C 27.38 QSO 17 43 56.4372020352 +27 52 50.344882032     17.7     ~ 66 1
16 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     15.5 15.11   ~ 507 2
17 4C 13.85 QSO 22 54 21.0197918040 +13 41 48.639947064     19.25     ~ 65 1

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2022.08.16-18:54:47

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