2017A&A...604A..21I


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.06CET19:19:51

2017A&A...604A..21I - Astronomy and Astrophysics, volume 604A, 21-21 (2017/8-1)

New JVLA observations at 3 GHz and 5.5 GHz of the "Kite" radio source in Abell 2626.

IGNESTI A., GITTI M., BRUNETTI G., FERETTI L. and GIOVANNINI G.

Abstract (from CDS):

Context. We report on new Karl Jansky Very Large Array (JVLA) observations performed at 3GHz and 5.5GHz of Abell 2626. The cluster has been the object of several studies in recent years due to its peculiar radio emission, which shows a complex system of symmetric radio arcs characterized by a steep spectrum. The origin of these radio sources is still unclear. Due to their mirror symmetry toward the center, it has been proposed that they may be created by pairs of precessing jets powered by the inner active galactic nuclei (AGN).
Aims. The new JVLA observations were requested with the specific aim of detecting extended emission on frequencies higher than 1.4GHz, in order to constrain the jet-precession model by analyzing the spectral index and radiative age patterns along the arcs.
Methods. We performed a standard data reduction of the JVLA datasets with the software CASA. By combining the new 3GHz data with the archival 1.4GHz VLA dataset we produced a spectral index map of the extended emission, and then estimated the radiative age of the arcs by assuming that the plasma was accelerated in moving hot-spots tracing the arcs.
Results. Thanks to the high sensitivity of the JVLA, we achieve the detection of the arcs at 3GHz and extended emission at 5.5GHz. We measure a mean spectral index < -2.5 for the arcs up to 3GHz. No clear trend in spectral index or radiative age is detected across the arcs, which may challenge the interpretation based on precession or put strong constraints on the jet-precession period. In particular, by analyzing the radiative age distribution along the arcs, we were able to provide for the first time a timescale <26Myr of the jet-precession period.

Abstract Copyright: © ESO, 2017

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: clusters: individual: Abell 2626 - galaxies: individual: IC 5338 - galaxies: individual: IC 5337 - galaxies: jets - radio continuum: galaxies - radio continuum: galaxies

Simbad objects: 9

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Number of rows : 9

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 QSO B0013-005 QSO 00 16 11.08855479 -00 15 12.4453413   20.44 19.98 19.72   ~ 117 1
2 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2439 2
3 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 726 1
4 ClG J0947+7623 ClG 09 47 12.9 +76 23 13           ~ 127 1
5 NGC 6866 OpC 20 03 55 +44 09.5   8.04 7.6     ~ 119 0
6 NAME PER-PEG A SUPERCL SCG 23 29.3 +15 34           ~ 15 0
7 IC 5337 EmG 23 36 25.063 +21 09 02.83   15.4       ~ 27 0
8 IC 5338 BiC 23 36 30.6133357036 +21 08 50.528599679   15.5       ~ 76 1
9 ACO 2626 ClG 23 36 31.0 +21 09 36           ~ 204 0

    Equat.    Gal    SGal    Ecl

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2019.12.06-19:19:51

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