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@article{1835119,
author = {Grossová, Romana and Werner, Norbert and Massaro, Francesco and Lakhchaura, Kiran and Plšek, Tomáš and Gabányi, Krisztina and Rajpurohit, Kamlesh and Canning, Rebecca E. A. and Nulsen, Paul and O'Sullivan, Ewan and Allen, Steven W. and Fabian, Andrew},
article_number = {2},
doi = {http://dx.doi.org/10.3847/1538-4365/ac366c},
keywords = {High energy astrophysics; Active galactic nuclei; Early-type galaxies},
language = {eng},
issn = {0067-0049},
journal = {Astrophysical Journal, Supplement Series},
title = {Very Large Array Radio Study of a Sample of Nearby X-Ray and Optically Bright Early-type Galaxies},
url = {https://iopscience.iop.org/article/10.3847/1538-4365/ac366c},
volume = {258},
year = {2022}
}
TY - JOUR
ID - 1835119
AU - Grossová, Romana - Werner, Norbert - Massaro, Francesco - Lakhchaura, Kiran - Plšek, Tomáš - Gabányi, Krisztina - Rajpurohit, Kamlesh - Canning, Rebecca E. A. - Nulsen, Paul - O'Sullivan, Ewan - Allen, Steven W. - Fabian, Andrew
PY - 2022
TI - Very Large Array Radio Study of a Sample of Nearby X-Ray and Optically Bright Early-type Galaxies
JF - Astrophysical Journal, Supplement Series
VL - 258
IS - 2
SP - 1-40
EP - 1-40
PB - IOP Publishing
SN - 00670049
KW - High energy astrophysics
KW - Active galactic nuclei
KW - Early-type galaxies
UR - https://iopscience.iop.org/article/10.3847/1538-4365/ac366c
N2 - Many massive early-type galaxies host central radio sources and hot X-ray atmospheres indicating the presence of radio-mechanical active galactic nucleus (AGN) feedback. The duty cycle and detailed physics of the radio-mode AGN feedback is still a matter of debate. To address these questions, we present 1-2 GHz Karl G. Jansky Very Large Array radio observations of a sample of the 42 nearest optically and X-ray brightest early-type galaxies. We detect radio emission in 41/42 galaxies. However, the galaxy without a radio source, NGC 499, has recently been detected at lower frequencies by the Low-Frequency Array. Furthermore, 27/42 galaxies in our sample host extended radio structures and 34/42 sources show environmental interactions in the form of X-ray cavities. We find a significant correlation between the radio flux density and the largest linear size of the radio emission and between the radio power and the luminosity of the central X-ray point source. The central radio spectral indices of the galaxies span a wide range of values, with the majority of the systems having steep spectra and the rest flat spectra. These results are consistent with AGN activity, where the central radio sources are mostly switched on, thus the duty cycle is very high. Seven out of 14 galaxies with pointlike radio emission (Fanaroff-Riley Class 0; FR 0) also show X-ray cavities indicating that, despite the lack of extended radio structures at 1-2 GHz, these AGNs do launch jets capable of inflating lobes and cavities.
ER -
GROSSOVÁ, Romana, Norbert WERNER, Francesco MASSARO, Kiran LAKHCHAURA, Tomáš PLŠEK, Krisztina GABÁNYI, Kamlesh RAJPUROHIT, Rebecca E. A. CANNING, Paul NULSEN, Ewan O'SULLIVAN, Steven W. ALLEN a Andrew FABIAN. Very Large Array Radio Study of a Sample of Nearby X-Ray and Optically Bright Early-type Galaxies. \textit{Astrophysical Journal, Supplement Series}. IOP Publishing, 2022, roč.~258, č.~2, s.~1-40. ISSN~0067-0049. Dostupné z: https://dx.doi.org/10.3847/1538-4365/ac366c.
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