2012A&A...538L...1K


Query : 2012A&A...538L...1K

2012A&A...538L...1K - Astronomy and Astrophysics, volume 538, L1-1 (2012/2-1)

The blazar-like radio structure of the TeV source IC 310.

KADLER M., EISENACHER D., ROS E., MANNHEIM K., ELSAESSER D. and BACH U.

Abstract (from CDS):

The radio galaxy IC310 in the Perseus cluster has recently been detected in the gamma-ray regime at GeV and TeV energies. The TeV emission shows time variability and an extraordinarily hard spectrum, even harder than the spectrum of the similar nearby gamma-ray emitting radio galaxy M87. High-resolution studies of the radio morphology help to constrain the geometry of the jet on sub-pc scales and to find out where the high-energy emission might come from. We analyzed May 2011 VLBA data of IC310 at a wavelength of 3.6cm, revealing the parsec-scale radio structure of this source. We compared our findings with more information available from contemporary single-dish flux density measurements with the 100-m Effelsberg radio telescope. We have detected a one-sided core-jet structure with blazar-like, beamed radio emission oriented along the same position angle as the kiloparsec scale radio structure observed in the past by connected interferometers. Doppler-boosting favoritism is consistent with an angle of θ≲38° between the jet axis and the line-of-sight, i.e., very likely within the boundary dividing low-luminosity radio galaxies and BL Lac objects in unified schemes. The stability of the jet orientation from parsec to kiloparsec scales in IC310 argues against its classification as a head-tail radio galaxy; i.e., there is no indication of an interaction with the intracluster medium that would determine the direction of the tail. IC310 seems to represent a low-luminosity FRI radio galaxy at a borderline angle to reveal its BL Lac-type central engine.

Abstract Copyright:

Journal keyword(s): galaxies: active - techniques: interferometric - X-rays: galaxies - radio continuum: general - gamma rays: galaxies - galaxies: individual: IC310

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 - 2021
#notes
1 7C 0059+5808 QSO 01 02 45.76238248 +58 24 11.1366009   20.09 19.22 18.57 17.90 ~ 202 1
2 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2617 2
3 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1194 2
4 IC 310 rG 03 16 42.9787725062 +41 19 29.629862447   14.3       ~ 241 2
5 NGC 1265 GiC 03 18 15.674 +41 51 27.94   14.7       ~ 352 2
6 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2042 1
7 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3691 3
8 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6099 0
9 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6497 3
10 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4133 3
11 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3929 2
12 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2372 1
13 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2083 1

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2021.10.20-21:48:30

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