J/A+A/588/A102 VLBI images of 2 binary AGN candidates (Bondi+, 2016)
Unveiling the radio counterparts of two binary AGN candidates:
J1108+0659 and J1131-0204.
Bondi M., Perez-Torres M.A., Piconcelli E., Fu H.
<Astron. Astrophys. 588, A102 (2016)>
=2016A&A...588A.102B 2016A&A...588A.102B (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; VLBI
Keywords: galaxies: active - galaxies: nuclei - galaxies: interactions -
radio continuum: galaxies - techniques: interferometric
Abstract:
The sources SDSS J113126.08-020459.2 and SDSS J110851.04+065901.4
are two double-peaked [OIII] emitting AGN, identified as candidate
binary AGNs by optical and near infrared (NIR) observations. We
observed the two sources with high resolution Very Long Baseline
Interferometry (VLBI) using the European VLBI Network at 5GHz,
reduced VLA observations at three frequencies available for one of
the sources, and used archival HST observations. For the source
SDSS J113126.08-020459.2, the VLBI observations detected only one
single compact component associated with the eastern NIR nucleus. In
SDSS J110851.04+065901.4, the VLBI observations did not detect any
compact components, but the VLA observations allowed us to identify a
possible compact core in the region of the north-western optical/NIR
nucleus. In this source we find kpc-scale extended radio emission that
is spatially coincident to the ultraviolet continuum and to the
extended emission narrow line region. The UV continuum is
significantly obscured since the amount of extended radio emission
yields a star formation rate of about 110M☉/yr, which is an
order of magnitude larger than implied by the observed ultraviolet
emission. Our analysis confirms the presence of only one AGN in the
two candidate binary AGNs.
Description:
J1108+0659 was observed in A-array configuration at L and C- bands
(on 2011 July 4) and at X-bands (on 2011 July 13) under project
11A-175 (PI: Fu).
We also used HST archival observations of J1131-0204 and J1108+0659.
The two sources were observed using the Wide Field Camera 3 (WFC3) on
board the Hubble Space Telescope (HST), programme code GO 12363.
Objects:
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RA (2000) DE Designation(s)
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11 08 51.03 +06 59 01.4 J1108+0659 = SDSS J110851.04+065901.4
11 31 26.08 -02 04 59.3 J1131-0204 = SDSS J113126.08-020459.2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 149 6 List of fits images
fits/* . 6 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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 37 A10 "date" Obs.dat Observation date
39- 45 F7.5 GHz Freq Observed frequency
47- 50 I4 Kibyte size Size of FITS file
52- 78 A27 --- FileName Name of FITS file, in subdirectory fits
80-149 A70 --- Title Title of the FITS file
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Acknowledgements:
Marco Bondi, bondi(at)ira.inaf.it
(End) Patricia Vannier [CDS] 23-Mar-2016