CHANG-ES: XVIII—The CHANG-ES Survey and Selected Results

Judith Irwin , Ancor Damas-Segovia , Marita Krause , Arpad Miskolczi , Jiangtao Li , Yelena Stein (1) , Jayanne English , Richard Henriksen , Rainer Beck , Theresa Wiegert , Ralf-Jürgen Dettmar

1 ObAS - Observatoire astronomique de Strasbourg

The CHANGES (Continuum Halos in Nearby Galaxies) survey of 35 nearby edge-on galaxies is revealing new and sometimes unexpected and startling results in their radio continuum emission. The observations were in wide bandwidths centred at 1.6 and 6.0 GHz. Unique to this survey is full polarization data showing magnetic field structures in unprecedented detail, resolution and sensitivity for such a large sample. A wide range of new results are reported here, some never before seen in any galaxy. We see circular polarization and variability in active galactic nuclei (AGNs), in-disk discrete features, disk-halo structures sometimes only seen in polarization, and broad-scale halos with reversing magnetic fields, among others. This paper summarizes some of the CHANGES results seen thus far.

Mots clés: galaxies individual; galaxies spiral; galaxies magnetic fields; radio continuum galaxies

Domaines: Planète et Univers [physics]

Judith Irwin, Ancor Damas-Segovia, Marita Krause, Arpad Miskolczi, Jiangtao Li, et al.. CHANG-ES: XVIII—The CHANG-ES Survey and Selected Results. Galaxies, 2019, 7 (1), pp.42. ⟨10.3390/galaxies7010042⟩. ⟨hal-03160362⟩