A Multi-Frequency Study of the Milky Way-Like Spiral Galaxy NGC 6744
Abstract
We present a multi-frequency study of the intermediate spiral SAB(r)bc type galaxy NGC 6744, using available data from the Chandra X-Ray telescope, radio continuum data from the Australia Telescope Compact Array and Murchison Widefield Array, and Wide-field Infrared Survey Explorer infrared observations. We identify 117 X-ray sources and 280 radio sources. Of these, we find nine sources in common between the X-ray and radio catalogues, one of which is a faint central black hole with a bolometric radio luminosity similar to the Milky Way's central black hole. We classify 5 objects as supernova remnant (SNR) candidates, 2 objects as likely SNRs, 17 as H ii regions, 1 source as an AGN; the remaining 255 radio sources are categorised as background objects and one X-ray source is classified as a foreground star. We find the star-formation rate (SFR) of NGC 6744 to be in the range 2.8-4.7 M⊙ yr - 1 signifying the galaxy is still actively forming stars. The specific SFR of NGC 6744 is greater than that of late-type spirals such as the Milky Way, but considerably less that that of a typical starburst galaxy.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- March 2018
- DOI:
- 10.1017/pasa.2018.9
- arXiv:
- arXiv:1802.03075
- Bibcode:
- 2018PASA...35...15Y
- Keywords:
-
- spiral;
- galaxies: active;
- ISM: supernova remnants;
- (ISM:) HII regions;
- techniques: image processing;
- infrared: galaxies;
- X-rays: general;
- radio continuum: galaxies;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- accepted for publication in PASA