A Multi-Frequency Study of the Milky Way-Like Spiral Galaxy NGC 6744

Date

2018

Authors

Yew, Miranda
Filipovic, M D
Roper, Quentin
Collier, J.D.
Crawford, Evan J.
Jarrett, Thomas
Tothill, Nicholas
O’Brien, Andrew
Pavlovic, Marko Z.
Pannuti, Thomas G

Journal Title

Journal ISSN

Volume Title

Publisher

CSLI Publications

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.

Description

Keywords

spiral, galaxies: active, ISM: supernova remnants, ISM: HII regions, techniques: image processing, infrared: galaxies, X-rays: general, radio continuum: galaxies

Citation

Source

Publications of the Astronomical Society of Australia

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1017/pasa.2018.9

Restricted until

2099-12-31