J/MNRAS/406/2578 Galaxies near S1189 (Mao+, 2010)
Wide-angle tail galaxies in ATLAS.
Mao M.Y., Sharp R., Saikia D.J., Norris R.P., Johnston-Hollitt M.,
Middelberg E., Lovell J.E.J.
<Mon. Not. R. Astron. Soc., 406, 2578-2590 (2010)>
=2010MNRAS.406.2578M 2010MNRAS.406.2578M
ADC_Keywords: Radio sources ; Clusters, galaxy ; Redshifts ;
Galaxies, photometry
Keywords: galaxies: active - galaxies: clusters: general -
galaxies: distances and redshifts - galaxies: general -
radio continuum: galaxies
Abstract:
We present radio images of a sample of six wide-angle tail (WAT) radio
sources, identified in the Australia Telescope Large Area Survey
1.4-GHz radio survey, and new spectroscopic redshifts for four of
these sources. These WATs are in the redshift range of 0.1469-0.3762,
and we find evidence of galaxy overdensities in the vicinity of four
of the WATs from either spectroscopic or photometric redshifts. We
also present follow-up spectroscopic observations of the area
surrounding the largest WAT, S1189, which is at a redshift of ∼0.22.
The spectroscopic observations, taken using the AAOmega spectrograph
on the Anglo-Australian Telescope, show an overdensity of galaxies at
this redshift. The galaxies are spread over an unusually large area of
∼12Mpc with a velocity spread of ∼4500km/s. This large-scale structure
includes a highly asymmetric Fanaroff-Riley type I radio galaxy and
also appears to host a radio relic. It may represent an unrelaxed
system with different sub-structures interacting or merging with one
another. We discuss the implications of these observations for future
large-scale radio surveys.
Description:
There appears to be a cluster of galaxies within ∼2-arcmin of S1189 in
the optical and infrared images. We obtained AAOmega observations for
sources within a degree of S1189 in a service mode during the night of
2008 October 18.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 58 42 Optical and infrared properties of the putative
cluster members
tablea1.dat 34 94 New redshifts of galaxies near S1189
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See also:
II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- SWIRE SWIRE ID (SWIRE[34] JHHMMSS.ss+DDMMSS.s)
28- 32 F5.2 mag Rmag ? SWIRE R magnitude
34- 39 F6.4 --- z Redshift
41- 45 F5.2 mJy Flux ? Radio flux density at 1.4GHz
47- 58 A12 --- Com Comment
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- SWIRE SWIRE ID (SWIRE[34] JHHMMSS.ss+DDMMSS.s)
28- 34 F7.5 --- z Redshift
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Mar-2011