Bibcode
Beswick, R. J.; McHardy, I. M.; Williams, D. R. A.; Baldi, R. D.; Argo, M. K.; Dullo, B. T.; Knapen, J. H.; Brinks, E.; Muxlow, T. W. B.; Aalto, S.; Alberdi, A.; Bendo, G. J.; Corbel, S.; Evans, R.; Fenech, D. M.; Green, D. A.; Klöckner, H.-R.; Körding, E.; Kharb, P.; Maccarone, T. J.; Martí-Vidal, I.; Mundell, C. G.; Panessa, F.; Peck, A. B.; Pérez-Torres, M. A.; Saikia, D. J.; Saikia, P.; Shankar, F.; Spencer, R. E.; Stevens, I. R.; Uttley, P.; Westcott, J.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 3, p.3478-3522
Advertised on:
5
2018
Citations
78
Refereed citations
71
Description
We present the first data release of high-resolution (≤0.2 arcsec)
1.5-GHz radio images of 103 nearby galaxies from the Palomar sample,
observed with the eMERLIN array, as part of the LeMMINGs survey. This
sample includes galaxies which are active (low-ionization nuclear
emission-line regions [LINER] and Seyfert) and quiescent (H II galaxies
and absorption line galaxies, ALGs), which are reclassified based upon
revised emission-line diagrams. We detect radio emission ≳0.2 mJy
for 47/103 galaxies (22/34 for LINERS, 4/4 for Seyferts, 16/51 for H II
galaxies, and 5/14 for ALGs) with radio sizes typically of ≲100 pc.
We identify the radio core position within the radio structures for 41
sources. Half of the sample shows jetted morphologies. The remaining
half shows single radio cores or complex morphologies. LINERs show radio
structures more core-brightened than Seyferts. Radio luminosities of the
sample range from 1032 to 1040 erg s-1:
LINERs and H II galaxies show the highest and lowest radio powers,
respectively, while ALGs and Seyferts have intermediate luminosities. We
find that radio core luminosities correlate with black hole (BH) mass
down to ˜107 M⊙, but a break emerges at
lower masses. Using [O III] line luminosity as a proxy for the accretion
luminosity, active nuclei and jetted H II galaxies follow an optical
Fundamental Plane of BH activity, suggesting a common disc-jet
relationship. In conclusion, LINER nuclei are the scaled-down version of
FR I radio galaxies; Seyferts show less collimated jets; H II galaxies
may host weak active BHs and/or nuclear star-forming cores; and
recurrent BH activity may account for ALG properties.
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