2015ApJ...808...92G


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET22:13:27

2015ApJ...808...92G - Astrophys. J., 808, 92 (2015/July-3)

Optical detection of the Pictor A jet and tidal tail: evidence against an IC/CMB jet.

GENTRY E.S., MARSHALL H.L., HARDCASTLE M.J., PERLMAN E.S., BIRKINSHAW M., WORRALL D.M., LENC E., SIEMIGINOWSKA A. and URRY C.M.

Abstract (from CDS):

New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is approximately 5" wide (3 kpc projected), starting 18" (12 kpc) from the center of Pictor A, and extends more than 90" (60 kpc). The knots are part of a jet observed to be about 4' (160 kpc) long, extending to a bright hotspot. These images are the first optical detections of this jet, and by extracting knot flux densities through three filters, we set constraints on emission models. While the radio and optical flux densities are usually explained by synchrotron emission, there are several emission mechanisms that might be used to explain the X-ray flux densities. Our data rule out Doppler-boosted inverse Compton scattering as a source of the high-energy emission. Instead, we find that the observed emission can be well described by synchrotron emission from electrons with a low-energy index () that dominates the radio band, while a high-energy index () is needed for the X-ray band and the transition occurs in the optical/infrared band. This model is consistent with a continuous electron injection scenario.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: Pictor A - galaxies: jets - X-rays: galaxies

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Pictor A Sy1 05 19 49.7230919028 -45 46 43.855209977   15.73 15.77 14.85   ~ 544 1
2 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 504 1
3 NAME Crt A Sy1 11 39 10.7024704226 -13 50 43.638984127   16.38 16.17 16.4   ~ 240 1
4 LB 2136 QSO 11 53 24.46663282 +49 31 08.8301947   17.94 17.66     ~ 411 1
5 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5275 1

    Equat.    Gal    SGal    Ecl

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2020.02.17-22:13:27

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