J/A+A/664/A25 Mrk273 high and low resolution maps (Kukreti+, 2022)
Seeing the forest and the trees: A radio investigation of the ULIRG Mrk 273.
Kukreti P., Morganti R., Bondi M., Oosterloo T., Tadhunter C.,
Morabito L.K., Adams E.A.K., Adebahr B., de Blok W.J.G., de Gasperin F.,
Drabent A., Hess K.M., Ivashina M.V., Kutkin A., Mika A.M., Oostrum L.C.,
Shimwell T.W., van der Hulst J.M., van Leeuwen J., van Weeren R.J.,
Vohl D., Ziemke J.
<Astron. Astrophys. 664, A25 (2022)>
=2022A&A...664A..25K 2022A&A...664A..25K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Radio continuum
Keywords: galaxies: active - radio continuum: galaxies -
galaxies: individual: Mrk 273 - galaxies: jets -
galaxies: interactions - techniques: high angular resolution
Abstract:
Galaxy mergers have been observed to trigger nuclear activity by
feeding gas to the central supermassive black hole. One such class of
objects are Ultra Luminous InfraRed Galaxies (ULIRGs), which are
mostly late stage major mergers of gas-rich galaxies. Recently,
large-scale (∼100kpc) radio continuum emission has been detected in a
select number of ULIRGs, all of which also harbour powerful Active
Galactic Nuclei (AGN). This hints at the presence of large-scale radio
emission being evidence for nuclear activity. Exploring the origin of
this radio emission and its link to nuclear activity requires high
sensitivity multi-frequency data. We present such an analysis of the
ULIRG Mrk 273. Using the International LOFAR telescope (ILT), we
detected spectacular large-scale arcs in this system. This detection
includes, for the first time, a giant ∼190kpc arc in the north. We
propose these arcs are fuelled by a low power radio AGN triggered by
the merger. We also identified a bright ∼45kpc radio ridge, which is
likely related to the ionised gas nebula in that region. We combined
this with high sensitivity data from APERture Tile In Focus (Apertif)
and archival data from the Very Large Array (VLA) to explore the
spectral properties. The ILT simultaneously allowed us to probe the
nucleus at a resolution of ∼0.300, where we detected three components,
and, for the first time, diffuse emission around these components.
Combining this with archival high frequency VLA images of the nucleus
allowed us to detect absorption in one component, and a steep spectrum
radio AGN in another. We then extrapolate from this case study to the
importance of investigating the presence of radio emission in more
ULIRGs and what it can tell us about the link between mergers and the
presence of radio activity.
Description:
We have combined data from the International LOFAR Telescope (ILT) Low
Band Antenna (LBA) at 42-68MHz and High Band Antenna (HBA) at
120-168MHz, Apertif at 1.36GHz and VLA at 1.4GHz and 4.7GHz to
trace the radio continuum and spectral properties of Mrk 273 at both
high and low resolutions.
Objects:
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RA (2000) DE Designation(s)
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13 44 42.19 +55 53 13.6 x Mrk273 = UGC 8696
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 128 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- 46 A19 "datime" Obs.date Observation date
48- 51 I4 MHz Freq Observed frequency
53- 56 I4 Kibyte size Size of FITS file
58- 84 A27 --- FileName Name of FITS file, in subdirectory fits
86-128 A43 --- Title Title of the FITS file
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Acknowledgements:
Pranav Kukreti, kukreti(at)astro.rug.nl
(End) Patricia Vannier [CDS] 05-Jul-2022