2016/09/15 by D. D. Mulcahy, M. Y. Mao, Minnie Mao +15 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Barred spiral galaxy #Bulge #Elliptical galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Giant Metrewave Radio Telescope #Grand design spiral galaxy #Irregular galaxy #Lenticular galaxy #Luminosity #Physics #Radio Astronomy Observations and Technology #Radio galaxy #Spiral (railway) #Spiral galaxy #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/201629536
published as A&A 595, L8 (2016) · 4 pages, Accepted for publication in Astronomy and Astrophysics
arxiv created 2016/09/15 · openalex publication_date 2016/10/07 · arxiv updated 2016/11/02 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
Standard galaxy formation models predict that large-scale double-lobed radio sources, known as DRAGNs, will always be hosted by elliptical galaxies. In spite of this, in recent years a small number of spiral galaxies have also been found to host such sources. These so-called spiral DRAGNs are still extremely rare, with only ~5 cases being widely accepted. Here we report on the serendipitous discovery of a new spiral DRAGN in data from the Giant Metrewave Radio Telescope (GMRT) at 322 MHz. The host galaxy, MCG+07-47-10, is a face-on late-type Sbc galaxy with distinctive spiral arms and prominent bulge suggesting a high black hole mass. Using WISE infra-red and GALEX UV data we show that this galaxy has a star formation rate of 0.16−0.75 M⊙ yr-1, and that the radio luminosity is dominated by star-formation. We demonstrate that this spiral DRAGN has similar environmental properties to others of this class, but has a comparatively low radio luminosity of L1.4 GHz = 1.12 × 1022 W Hz-1, two orders of magnitude smaller than other known spiral DRAGNs. We suggest that this may indicate the existence of a previously unknown low-luminosity population of spiral DRAGNS.