2005ApJ...630..721T


Query : 2005ApJ...630..721T

2005ApJ...630..721T - Astrophys. J., 630, 721-728 (2005/September-2)

X-ray and optical emission from radio hot spots of powerful quasars.

TAVECCHIO F., CERUTTI R., MARASCHI L., SAMBRUNA R.M., GAMBILL J.K., CHEUNG C.C. and URRY C.M.

Abstract (from CDS):

In a survey with Chandra and HST of a sample of 17 radio sources with bright radio jets (16 powerful FR II and one nearby FR I), we detected X-ray and optical emission from a number of radio hot spots and lobes. Six hot spots on the near sides of powerful FR II galaxies (as determined from the jet asymmetry) were detected at X-rays, while none were detected on the far side, suggesting that high-energy emission from hot spots is anisotropic. In the nearby FR I galaxy 0836+299 (the only FR I in our sample) both hot spots are detected in X-rays, in agreement with the symmetric radio morphology. In the latter case the spectral energy distributions (SEDs) of both hot spots can be modeled from radio to X-rays with synchrotron emission from a single power-law energy distribution of electrons with Lorentz factors up to ∼2x107. For the six hot spots of powerful FR II galaxies the X-ray flux lies above the extrapolation from the radio-to-optical continuum. Modeling the SEDs with a one-zone synchrotron self-Compton model, we find that equipartition is strongly violated, with the particle energy density dominating over the magnetic field one by 1-2 orders of magnitude. We discuss alternatives to this simple model, concluding that a viable alternative is that the X-ray emission is produced in the still-relativistic (Doppler factor δ=3-6) terminal part of the jet by inverse Compton (IC) scattering on the CMB or synchrotron photons emitted by plasma flowing with a small velocity. X-ray emission from some of the lobes is detected on the side opposite to the jet, suggesting the possible relevance of back-scattered central radiation in providing seed photons for the IC process.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Quasars: General - X-Rays: Galaxies

CDS comments: Parag. 4 : 1136-125 is a misprint for 1136-135

Simbad objects: 24

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Number of rows : 24
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 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1243 1
2 PKS 0405-123 Sy1 04 07 48.4309594137 -12 11 36.660481492   15.09 14.86 14.7   ~ 480 1
3 QSO B0605-0834 BLL 06 07 59.69923743 -08 34 49.9781718     18.5 17.70   ~ 414 1
4 ICRF J072810.8+674847 Sy1 07 28 10.8962277463 +67 48 47.034337197     18.0     ~ 199 1
5 ICRF J074110.7+311200 Sy1 07 41 10.7032630079 +31 12 00.232776104   17.02 16.89 16.322   ~ 423 1
6 3C 191 QSO 08 04 47.9666563347 +10 15 23.744155270   18.65 18.40     ~ 268 2
7 2MASX J08400233+2949027 Sy2 08 40 02.336 +29 49 02.73   20.00 19.62     ~ 162 1
8 ICRF J084047.5+131223 Sy1 08 40 47.58841798 +13 12 23.5641152   18.58 18.15 17.622   ~ 397 1
9 4C 12.37 QSO 10 42 44.6052225597 +12 03 31.266524549   18.03 17.77     ~ 411 2
10 4C 01.28 BLL 10 58 29.60520747 +01 33 58.8237691   18.74 18.28 16.68   ~ 691 2
11 NAME Crt A Sy1 11 39 10.7024704226 -13 50 43.638984127   16.38 16.17 16.4   ~ 252 1
12 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5467 1
13 2C 1066 SyG 12 56 57.9 +47 20 20   22.0       ~ 271 0
14 NAME Cen B QSO 13 46 49.04327124 -60 24 29.3552337         15.74 ~ 133 0
15 ICRF J135704.4+191907 Sy1 13 57 04.43665381 +19 19 07.3724675   16.33 16.03 15.3   ~ 420 2
16 QSO J1512-0906 Bla 15 12 50.53292491 -09 05 59.8295878   16.74 16.54     ~ 1201 1
17 4C 69.21 QSO 16 42 07.8485400 +68 56 39.756414   19.723   19.219   ~ 290 1
18 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1592 2
19 4C 27.38 QSO 17 43 56.4373539062 +27 52 50.337973242     17.7     ~ 66 1
20 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1242 0
21 4C 73.18 BLL 19 27 48.4944745594 +73 58 01.571908984     15.5 15.11   ~ 501 2
22 3C 403.0 Sy2 19 52 15.7997953344 +02 30 24.235518851   15.42 16.5     ~ 304 1
23 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2188 2
24 4C 13.85 QSO 22 54 21.0162247 +13 41 48.675717     19.25     ~ 65 1

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2021.09.26-02:27:00

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