J/A+A/668/A64 GRG-J2233+1315 GMRT and LOFAR images (Dabhade+, 2022)
Barbell shaped giant radio galaxy with ∼100 kpc kink in the jet.
Dabhade P., Shimwell T.W., Bagchi J., Saikia D.J., Combes F., Gaikwad M.,
Rottgering H., Mohapatra A., Ishwara-Chandra C.H., Intema H.,
Raychaudhury S.
<Astron. Astrophys. 668, A64 (2022)>
=2022A&A...668A..64D 2022A&A...668A..64D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Radio continuum
Keywords: galaxies: jets - galaxies: active - galaxies: clusters: general -
radio continuum: galaxies - instabilities -
galaxies: clusters: intracluster medium
Abstract:
We present for the first time a study of peculiar giant radio galaxy
(GRG) J223301+131502 using deep multi-frequency radio observations
from GMRT (323, 612, and 1300MHz) and LOFAR (144MHz) along with
optical spectroscopic observations with the WHT 4.2m optical
telescope. Our observations have firmly established its redshift of
0.09956 and unveiled its exceptional jet structure extending more than
∼200kpc leading to a peculiar kink structure of ∼100kpc. We
measure the overall size of this GRG to be ∼1.83Mpc; it exhibits
lobes without any prominent hotspots and closely resembles a barbell.
Our deep low-frequency radio maps clearly reveal the steep-spectrum
diffuse emission from the lobes of the GRG. The magnetic field
strength of ∼5uG and spectral ages between about 110 to 200
mega years for the radio lobes were estimated using radio data from
LOFAR 144MHz observations and GMRT 323 and 612MHz observations. We
discuss the possible causes leading to the formation of the observed
kink feature for the GRG, which include precession of the jet axis,
development of instabilities and magnetic reconnection. Despite its
enormous size, the Barbell GRG is found to be residing in a low-mass
(M200∼1014M☉) galaxy cluster. This GRG with two-sided
large-scale jets with a kink and diffuse outer lobes residing in a
cluster environment, provides an opportunity to explore the structure
and growth of GRGs in different environments.
Description:
GRG-J2233+1315 was observed with GMRT at 323MHz and 612MHz during
2015-2016.
GRG-J2233+1315 was observed three times between September 2016 and
March 2020, once in a dedicated eighthour LOFAR observation.
Objects:
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RA (2000) DE Designation(s)
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22 33 01.30 +13 15 02.52 GRG-J2233+1315
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 84 3 List of fits images
fits/* . 3 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 48 A19 "datime" Obs.date Observation date
50- 56 F7.3 MHz Freq Observed frequency
58- 61 I4 Kibyte size Size of FITS file
63- 70 A8 --- FileName Name of FITS file, in subdirectory fits
72- 84 A13 --- Title Title of the FITS file
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Acknowledgements:
Pratik Dabhade, pratikdabhade13(at)gmail.com
(End) Patricia Vannier [CDS] 18-Nov-2022