Investigating the nuclear activity of barred spiral galaxies : the case of NGC 1672
Jenkins, L. P., Brandt, W. N., Colbert, E. J. M., Koribalski, B. S. (Bärbel Silvia), Kuntz, Kip D., Levan, A. J., Ojha, R., Roberts, T. P., Ward, M. J. (Martin J.) and Zezas, A.. (2011) Investigating the nuclear activity of barred spiral galaxies : the case of NGC 1672. The Astrophysical Journal, Vol.734 (No.1). p. 33. ISSN 0004-637XFull text not available from this repository.
Official URL: http://dx.doi.org/10.1088/0004-637X/734/1/33
We have performed an X-ray study of the nearby barred spiral galaxy NGC 1672, primarily to ascertain the effect of the bar on its nuclear activity. We use both Chandra and XMM-Newton observations to investigate its X-ray properties, together with supporting high-resolution optical imaging data from the Hubble Space Telescope (HST), infrared imaging from the Spitzer Space Telescope, and Australia Telescope Compact Array ground-based radio data. We detect 28 X-ray sources within the D(25) area of the galaxy; many are spatially correlated with star formation in the bar and spiral arms, and two are identified as background galaxies in the HST images. Nine of the X-ray sources are ultraluminous X-ray sources, with the three brightest (L(X) > 5 x 10(39) erg s(-1)) located at the ends of the bar. With the spatial resolution of Chandra, we are able to show for the first time that NGC 1672 possesses a hard (Gamma similar to 1.5) nuclear X-ray source with a 2-10 keV luminosity of 4 x 10(38) erg s(-1). This is surrounded by an X-ray-bright circumnuclear star-forming ring, comprised of point sources and hot gas, which dominates the 2-10 keV emission in the central region of the galaxy. The spatially resolved multiwavelength photometry indicates that the nuclear source is a low-luminosity active galactic nucleus (LLAGN), but with star formation activity close to the central black hole. A high-resolution multiwavelength survey is required to fully assess the impact of both large-scale bars and smaller-scale phenomena such as nuclear bars, rings, and nuclear spirals on the fueling of LLAGN.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Spiral galaxies, Galaxies -- Evolution, Galactic nuclei|
|Journal or Publication Title:||The Astrophysical Journal|
|Publisher:||Institute of Physics Publishing, Inc.|
|Official Date:||10 June 2011|
|Page Range:||p. 33|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||United States. National Aeronautics and Space Administration (NASA), European Space Agency (ESA)|
|Grant number:||NNX10AC99G (NASA), NAS8-03060 (NASA)|
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