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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.; Kuntz, K.D.; Levan, A.J.; Ojha, R.; Roberts, T.P.; Ward, M.J.; Zezas, A.

Investigating the Nuclear Activity of Barred Spiral Galaxies: The Case of NGC 1672 Thumbnail


L.P. Jenkins

W.N. Brandt

E.J.M. Colbert

B. Koribalski

K.D. Kuntz

A.J. Levan

R. Ojha

M.J. Ward

A. Zezas


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 D25 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 (LX > 5 × 1039 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 (Γ ∼ 1.5) nuclear X-ray source with a 2–10 keV luminosity of 4 × 1038 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.


Jenkins, L., Brandt, W., Colbert, E., Koribalski, B., Kuntz, K., Levan, A., …Zezas, A. (2011). Investigating the Nuclear Activity of Barred Spiral Galaxies: The Case of NGC 1672. Astrophysical Journal, 734(1), Article 33.

Journal Article Type Article
Publication Date Jun 10, 2011
Deposit Date Jan 30, 2012
Publicly Available Date Feb 12, 2014
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 734
Issue 1
Article Number 33
Keywords Galaxies, Evolution, Individual (NGC 1672), Nuclei, Spiral.


Published Journal Article (2 Mb)

Copyright Statement
© 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A.

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