In The Astronomical Journal, Volume 150, 81 (2015).
http://arxiv.org/abs/1508.05153
For a PDF version of the article, click here.
CHANG-ES IV: RADIO CONTINUUM EMISSION OF 35 EDGE-ON GALAXIES
OBSERVED WITH THE KARL G. JANSKY VERY LARGE ARRAY IN D-CONFIGURATION -
DATA RELEASE 1
Theresa Wiegert 1, Judith Irwin 2, Arpad
Miskolczi 3, Philip Schmidt 4, Silvia Carolina
Mora 5, Ancor Damas-Segovia 6, Yelena Stein
7, Jayanne English 8, Richard J. Rand
9, Isaiah Santistevan 10, Rene Walterbos
11, Marita Krause 12, Rainer Beck 13,
Ralf-Jurgen Dettmar 14, Amanda Kepley 15, Marek
Wezgowiec 16, Q. Daniel Wang 17, George Heald
18, Jiangtao Li 19, Stephen MacGregor
20, Megan Johnson 21, A. W. Strong 22,
Amanda DeSouza 23, Troy A. Porter 24
Abstract:
We present the first part of the observations made for the Continuum
Halos in Nearby Galaxies, an EVLA Survey (CHANG-ES) project. The aim of
the CHANG-ES project is to study and characterize the nature of radio
halos, their prevalence, as well as their magnetic fields and the cosmic
rays illuminating these fields. This paper reports observations with the
compact D-configuration of the Karl G. Jansky Very Large Array (VLA) for
the sample of 35 nearby edge-on galaxies of CHANG-ES. With the new wide
bandwidth capabilities of the VLA, an unprecedented sensitivity was
achieved for all polarization products. The beam resolution is an
average of 9.6" and 36" with noise levels reaching approximately 6
and 30 µJy/beam for C and L bands respectively (robust
weighting).
We present intensity maps in these two frequency bands (C
and L), with different weightings, as well as spectral index maps,
polarization maps and new measurements of star formation rates. The data
products described herein are available to the public in CHANG-ES Data
Release available at http://www.queensu.ca/changes.
We also present evidence of a trend between galaxies with larger halos
having higher SFR surface density, and show,
for the first time, a radio continuum image of the median galaxy, taking
advantage of the collective signal-to-noise of 30 of our galaxies. This
image shows clearly that a ’typical’ spiral galaxy is
surrounded by a halo of magnetic fields and cosmic rays.
Keywords : radio continuum: galaxies — galaxies:
surveys, ...
Table of Contents
1 Dept. of Physics, Engineering physics & Astronomy,
Queen’s University, Kingston, ON, Canada, K7L 3N6;
2 Dept. of Physics, Engineering Physics & Astronomy,
Queen’s University, Kingston, ON, Canada, K7L 3N6
3 Astronomisches Institut, Ruhr-Universität Bochum,
44780 Bochum, Germany
4Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, 53121, Bonn, Germany
5 Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, 53121, Bonn, Germany
6 Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, 53121, Bonn, Germany
7 Astronomisches Institut, Ruhr-Universität Bochum,
44780 Bochum, Germany
8 Department of Physics and Astronomy,
University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
9 Dept. of Physics and Astronomy, University of New Mexico,
800 Yale Boulevard, NE, Albuquerque, NM, 87131, USA
10 Dept. of Physics and Astronomy, University of New Mexico,
800 Yale Boulevard, NE, Albuquerque, NM, 87131, USA
11 Dept. of Astronomy, New Mexico State University,
PO Box 30001, MSC 4500, Las Cruces, NM 88003, USA
12 Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, 53121, Bonn, Germany
13 Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, 53121, Bonn, Germany
14 Astronomisches Institut, Ruhr-Universität Bochum,
44780 Bochum, Germany
15 NRAO Charlottesville, 520 Edgemont Road, Charlottesville,
VA 22903-2475, USA
16 Astronomisches Institut, Ruhr-Universität Bochum,
44780 Bochum, Germany
17 Dept. of Astronomy, University of Massachusetts, 710 North
Pleasant St., Amherst, MA, 01003, USA
18 Netherlands Institute for Radio Astronomy (ASTRON),
Postbus 2, 7990 AA, Dwingeloo, The Netherlands
19 Dept. of Astronomy, University of Michigan, 311 West Hall,
1085 S. University Ave., Ann Arbor, MI 48109, USA
20 Dept. of Physics, Engineering physics & Astronomy,
Queen’s University, Kingston, ON, Canada, K7L 3N6
21 CSIRO, PO Box 76, Epping, NSW 1710, Australia
22 Max-Planck-Institut für extraterrestrische Physik,
Garching bei München, Germany
23 Dept. of Physics, Engineering physics & Astronomy,
Queen’s University,
Kingston, ON, Canada, K7L 3N6
24 Hansen Experimental Physics Laboratory, Stanford University,
452 Lomita Mall, Stanford, CA, 94305, USA
