CHANG-ES (Continuum Halos in Nearby Galaxies — an EVLA Survey) is a large project to observe 35 edge-on galaxies using the Expanded Very Large Array (EVLA, now known as the Karl G. Jansky Very Large Array) at two frequencies: 6 GHz (C-band) and 1.6 GHz (L-band). The publically available data and other information can be found on the CHANG-ES website.
The Wisconsin 2016 CHANG-ES Workshop will be the fourth workshop (and the first US workshop) gathering the team members and outside experts to discuss radio halos of galaxies. Previous workshops have been held at the Lorentz Center in Leiden, The Netherlands (2013), Queen's University (2014) in Kingston, Ontario (Canada), and Max Planck Institute for Radio Astronomy in Bonn, Germany (2015) .
The observations have been carried out at B, C, and D configurations in L-band and at C and D configurations in C-band. All polarization products have been obtained which provide maps of total intensity, linear polarization, and polarization angle. Since the bandwidths are large (500 MHz and 2 GHz at L-band and C-band, respectively), it is also possible to form maps of the spectral index at each band. Together, these data form the most comprehensive data set yet available for the study of nearby edge-on galaxies. Complementary Green Bank Telescope (GBT) observations currently in progress will provide information on the large scale halo emission to complete the project. Note that this website applies to VLA data only.
Our scientific goals encompass a variety of objectives involving galaxy disks, disk-halo outflows, and broader-scale halos. These include:
These results can be compared to complementary data at other wavebands so that a global and comprehensive understanding of galaxy outflows may result.
Clickable versions of these galaxies with CHANGE-ES data can be found on the CHANG-ES website . The images above were produced by Jiangtao Li (University of Michigan) for the CHANG-ES consortium using data from the Sloan Digital Sky Survey and the Digitized Sky Survey. CHANG-ES has been supported by the Natural Sciences and Engineering Research Council of Canada.
University of Wisconsin-Whitewater
CSIRO Astronomy and Space Science
National Radio Astronomy Observatory
Max-Planck-Institut für Radioastronomie