J/A+A/629/A58 B2 0258+35 VLA and VLBI HI absorption spectra (Murthy+, 2019)
Feedback from low-luminosity radio galaxies: B2 0258+35.
Murthy S., Morganti R., Oosterloo T., Schulz R., Mukherjee D., Wagner A Y.,
Bicknell G., Prandoni I., Shulevski A.
<Astron. Astrophys. 629, A58 (2019)>
=2019A&A...629A..58M 2019A&A...629A..58M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxies, spectra ; Galaxies, radio ; H I data
Keywords: galaxies: active - galaxies: individual: B2 0258+35 -
radio lines: galaxies - galaxies: ISM
Abstract:
Low-luminosity radio-loud active galactic nuclei (AGN) are of
importance in studies concerning feedback from radio AGN since a
dominant fraction of AGN belong to this class. We report
high-resolution Very Large Array (VLA) and European VLBI Network (EVN)
observations of HI 21cm absorption from a young, compact
steep-spectrum radio source, B2 0258+35, nested in the early-type
galaxy NGC 1167, which contains a 160kpc HI disc. Our VLA and EVN HI
absorption observations, modelling, and comparison with molecular gas
data suggest that the cold gas in the centre of NGC 1167 is very
turbulent (with a velocity dispersion of ∼90km/s) and that this
turbulence is induced by the interaction of the jets with the
interstellar medium (ISM). Furthermore, the ionised gas in the galaxy
shows evidence of shock heating at a few kpc from the radio source.
These findings support the results from numerical simulations of radio
jets expanding into a clumpy gas disc, which predict that the radio
jets in this case percolate through the gas disc and drive shocks into
the ISM at distances much larger than their physical extent. These
results expand the number of low-luminosity radio sources found to
impact the surrounding medium, thereby highlighting the possible
relevance of these AGN for feedback.
Description:
4 reduced HI absorption spectra obtained from VLA and 1 reduced HI
absorption spectrum from EVN are provided in ascii format. They are
presented in Figures 2, 4 and 5 of the article.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
03 01 42.36 +35 12 20.3 B2 0258+35 = NGC 1167
----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 96 5 Filename, telescope, location of
spectrum extraction
sp/* . 5 Individual spectra
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- FileName Name of the spectrum file in subdirectory sp
9- 12 A4 --- Tel Telescope used
13- 24 A12 --- Loc Integrated spectrum/extracted against location
26- 96 A71 --- Title Title of the file
--------------------------------------------------------------------------------
Byte-by-byte Description of file: sp/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.5 m/s Vel Velocity with respect to z=0.0165
17- 37 F21.18 Jy/beam Flux Flux density
--------------------------------------------------------------------------------
Acknowledgements:
Suma Murthy, murthy(at)astro.rug.nl
(End) Suma Murthy [Kapteyn, The Netherlands], Patricia Vannier [CDS] 08-Aug-2019