CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

DOI: 
10.3847/1538-3881/ab25f6
Publication date: 
01/07/2019
Main author: 
Irwin, Judith
IAA authors: 
Damas-Segovia, Ancor
Authors: 
Irwin, Judith;Wiegert, Theresa;Merritt, Alison;Weżgowiec, Marek;Hunt, Lucas;Woodfinden, Alex;Stein, Yelena;Damas-Segovia, Ancor;Li, Jiangtao;Wang, Q. Daniel;Johnson, Megan;Krause, Marita;Dettmar, Ralf-Jürgen;Im, Jisung;Schmidt, Philip;Miskolczi, Arpad;Braun, Timothy T.;Saikia, D. J.;English, Jayanne;Richardson, Mark
Journal: 
The Astronomical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
158
Pages: 
21
Abstract: 
The CHANG-ES galaxy sample consists of 35 nearby edge-on galaxies that have been observed using the VLA at 1.6 and 6.0 GHz. Here we present the third data release of our sample, namely, the B configuration 1.6 GHz sample. In addition, we make available the band-to-band spectral index maps between 1.6 and 6.0 GHz, the latter taken in the matching resolution C configuration. The images can be downloaded from <A href='https://www.queensu.ca/changes'>https://www.queensu.ca/changes</A>. These are our highest-resolution images (≈3″), and we examine the possible presence of low-luminosity active galactic nuclei (AGNs) in the sample, as well as some in-disk structure. New features can be seen in the spectral index maps that are masked in the total intensity emission, including hidden spiral arms in NGC 3448 and two previously unknown radio lobes on either side of the nucleus of NGC 3628. Our AGN detection rate, using only radio criteria, is 55%, which we take as a lower limit because some weaker embedded AGNs are likely present that could be revealed at higher resolution. Archival XMM-Newton data were used to search for further fingerprints of the AGNs in the studied sample. In galaxy disks, discrete regions of flat spectral index are seen, likely due to a thermal emission fraction that is higher than the global average.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85072409116&doi=10.3847%2f1538-3881%2fab25f6&partnerID=40&md5=4085ed25fae90fe32f76856135820a2a
ADS Bibcode: 
2019AJ....158...21I
Keywords: 
radio continuum: galaxies;surveys;Astrophysics - Astrophysics of Galaxies