J/A+A/690/A195 LOFAR-MeerKAT AGN in Virgo cluster galaxies (Spasic+, 2024)
ViCTORIA project: The LOFAR-MeerKAT view of active galactic nuclei in
Virgo cluster early-type galaxies.
Spasic A., Edler H.W., Su Y., Brueggen M., de Gasperin F., Pasini T.,
Heesen V., Simonte M., Boselli A., Roettgering H.J.A., Fossati M.
<Astron. Astrophys. 690, A195 (2024)>
=2024A&A...690A.195S 2024A&A...690A.195S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Clusters, galaxy ; Galaxies, radio
Keywords: radiation mechanisms: non-thermal - galaxies: active -
galaxies: elliptical and lenticular, cD -
galaxies: clusters: individual: Virgo - galaxies: jets
Abstract:
The evolution of active galactic nuclei (AGNs) is closely connected to
their host galaxies and surroundings. Via feedback processes, AGNs can
counteract the cooling of the intracluster medium (ICM) and suppress
star formation in their host galaxies. Radio observations at low
frequencies provide a glimpse into the history of AGN activity. The
Virgo cluster is a substantial reservoir of nearby galaxies and
provides an ideal laboratory for the study of AGNs as well as their
feedback mechanisms.
The aim of our work is to characterise the AGN population within the
Virgo cluster down to low radio luminosities, constrain the AGN duty
cycle, and investigate environmental feedback in cluster member
galaxies.
We analysed 144MHz and 1.3GHz radio observations of early-type
galaxies from the ACS Virgo Cluster Survey (ACSVCS) taken with LOFAR
and MeerKAT.
We detect 12 of these galaxies at 144MHz, five of which show clearly
extended radio emission. The radio luminosity shows a strong
dependence on the stellar mass of the host galaxy, in agreement with
previous results. As a notable outlier, the massive elliptical galaxy
NGC4365 (M*=2.2x1011M☉) is not detected as compact source
in the LOFAR observations. Instead, it is surrounded by diffuse,
low-surface brightness emission, which hints towards a past phase of
stronger nuclear activity. Furthermore, we find a cavity in NGC4472
(= M49) inflated by the wide-angle tail only visible in the LOFAR
data, which implies that the cavity was created by a past outburst.
The corresponding cavity power is of the same order of magnitude as
the jet power in the present duty cycle of the AGN.
Description:
FITS images of the 11 early-type galaxies in the Virgo cluster
detected at 1.28GHz with MeerKAT. Each image is a cutout of one of
seven mosaics which are primary-beam corrected and convolved to the
smallest common circular synthesized beam (between 9.7" and 12.7").
The weights were calculated according to the central noise level in
the pointing.
Objects:
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RA (2000) DE Designation(s)
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12 25 03.74 +12 53 13.1 NGC4374 = 1Jy 1222+13
12 26 11.81 +12 56 45.4 NGC4406 = 1ES 1223+13.2
12 27 40.50 +13 04 44.4 NGC4435 = 2MASX J12274050+1304444
12 29 00.03 +13 58 42.8 NGC4459 = 2MASX J12290002+1358428
12 29 46.77 +08 00 01.4 NGC4472 = 1E 1227.5+0817
12 30 49.42 +12 23 28.0 NGC4486 = 1A 1228+12
12 34 03.02 +07 41 56.9 NGC4526 = 2E 2773
12 35 39.80 +12 33 22.8 NGC4552 = 1REX J123539+1233.3
12 42 02.25 +11 38 48.9 NGC4621 = 2E 2825
12 43 39.96 +11 33 09.6 NGC4649 = 1RXS J124340.6+113309
12 44 31.98 +11 11 25.7 NGC4660 = 2MASX J12443197+1111259
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 85 11 List of fits images
fits/* . 11 Individual fits images
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See also:
J/A+A/676/A24 : The LOFAR HBA Virgo Cluster Survey (Edler+, 2023)
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- 34 I5 Kibyte size Size of FITS file
36- 55 A20 --- FileName Name of FITS file, in subdirectory fits
57- 85 A29 --- Title Title of the FITS file
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Acknowledgements:
Angelina Spasic, angelina.spasic(at)hs.uni-hamburg.de
(End) Patricia Vannier [CDS] 26-Sep-2024