The jet/wind outflow in Centaurus A: a local laboratory for AGN feedback
Name
1711.01751.pdf
Description
Accepted version
Size
9.9 MB
Format
Adobe PDF
Checksum (MD5)
f1c3e7f193c2b022b150ae8df3cc3368
Author(s)
McKinley, B
Tingay, SJ
Carretti, E
Ellis, S
Bland-Hawthorn, J
Morganti, R
Line, J
McDonald, M
Veilleux, S
Wahl Olsen, R
Date Issued
2018
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Version
Author's final manuscript
Abstract
© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. We present new radio and optical images of the nearest radio galaxy Centaurus A and its host galaxy NGC 5128.We focus our investigation on the northern transition region, where energy is transported from the ~5 kpc (~5 arcmin) scales of the northern inner lobe (NIL) to the ~30 kpc (~30 arcmin) scales of the northern middle lobe (NML). Our Murchison Widefield Array observations at 154 MHz and our Parkes radio telescope observations at 2.3 GHz show diffuse radio emission connecting the NIL to the NML, in agreement with previous Australia Telescope Compact Array observations at 1.4 GHz. Comparison of these radio data with our wide-field optical emission-line images show the relationship between the NML radio emission and the ionized filaments that extend north from the NIL, and reveal a new ionized filament to the east, possibly associated with a galactic wind. Our deep optical images show clear evidence for a bipolar outflow from the central galaxy extending to intermediate scales, despite the non-detection of a southern radio counterpart to the NML. Thus, our observational overview of Centaurus A reveals a number of features proposed to be associated with active galactic nucleus feedback mechanisms, often cited as likely to have significant effects in galaxy evolution models. As one of the closest galaxies to us, Centaurus A therefore provides a unique laboratory to examine feedback mechanisms in detail.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1093/MNRAS/STX2890
