The Discovery of a Low-Luminosity SPIRAL DRAGN

Abstract

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 $\sim 5$ 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${}_{\odot }$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 $L_{1.4GHz}$ = 1.12$\times$10${}^{22}$ 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.

4 pages, Accepted for publication in Astronomy and Astrophysics

References in corpus (7)

• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• The VLA Low-frequency Sky Survey
• The 1% Concordance Hubble Constant
• The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
• A catalogue of 2D photometric decompositions in the SDSS-DR7 spectroscopic main galaxy sample: preferred models and systematics
• Mega parsec relativistic jets launched from an accreting supermassive blackhole in an extreme spiral galaxy
• J1649+2635: A Grand-Design Spiral with a Large Double-Lobed Radio Source

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• Three New Spiral Galaxies with Active Nuclei Producing Double Radio Lobes