2001A&A...377..827G


Query : 2001A&A...377..827G

2001A&A...377..827G - Astronomy and Astrophysics, volume 377, 827-834 (2001/10-3)

Are the hotspots of radio galaxies the sites of in situ acceleration of relativistic particles?

GOPAL-KRISHNA, SUBRAMANIAN P., WIITA P.J. and BECKER P.A.

Abstract (from CDS):

Using a large set of optically detected hotspots in powerful extragalactic double radio sources, we examine the basic question of whether the detection of optical synchrotron radiation requires in situ acceleration of relativistic electrons within the hotspots/lobes. For this, we take into account the jet's bulk relativistic motion, as well as its likely misalignment from the plane of the sky. Together, both these factors can drastically reduce the apparent range of the ultra-relativistic electrons ejected from the nucleus in the form of a jet. The conventionally adopted parameter space for the fundamental variables, namely, the hotspot magnetic field, radio source orientation angle relative to the line-of-sight and the bulk speed of the jet plasma, is considered. We find that the observed optical/near-IR synchrotron emission of the hotspots can be explained even if the radiating relativistic electrons were accelerated exclusively within the nuclear region, provided the energy losses incurred by the electrons during their transport down the jet are dominated by inverse Compton upscatterings of the cosmic microwave background photons. Under this circumstance, in situ acceleration of relativistic electrons inside the hotspots or lobes is not found to be mandated by their reported optical/near-infrared detections.

Abstract Copyright:

Journal keyword(s): acceleration of particles - radiation mechanisms: non-thermal - galaxies: active - galaxies: jets - continuum: galaxies - X-rays: galaxies radio

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 4C -00.01 QSO 00 06 22.6058589240 -00 04 24.453903468   20.14 19.35     ~ 189 1
2 3C 20 Sy2 00 43 09.6 +52 03 35   19.0       ~ 206 0
3 2C 94 Sy2 01 08 52.8701830824 +13 20 14.262799812   15.19       ~ 462 2
4 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 910 1
5 NAME Per B AGN 04 37 04.37535450 +29 40 13.8179631   21.7       ~ 502 2
6 NAME Pic A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 629 1
7 3C 247 QSO 10 58 58.70 +43 01 23.0   21.5       ~ 154 1
8 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5638 1
9 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 955 5
10 NAME OKM2018 SWIFT J1442.9+5206 Sy1 14 43 02.76069031 +52 01 37.2985156   18.96 18.29     ~ 288 3
11 3C 351.0 Sy1 17 04 41.3742408840 +60 44 30.520617000   15.65 15.40 15.30   ~ 738 1
12 ICRF J184208.9+794617 Sy1 18 42 08.9904975672 +79 46 17.127835104   16.06 15.38     ~ 1276 0
13 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2279 2

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2023.02.04-09:02:41

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