Accession Number : ADA564518


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


Descriptive Note : Journal article


Corporate Author : NAVAL OBSERVATORY WASHINGTON DC


Personal Author(s) : Jenkins, L P ; Brandt, W N ; Colbert, E J ; Koribalski, B ; Kuntz, K D ; Levan, A J ; Ojha, R ; Roberts, T P ; Ward, M J ; Zezas, A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a564518.pdf


Report Date : 10 Jun 2011


Pagination or Media Count : 22


Abstract : 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 * 10(exp 39) erg s(exp -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 (1.5) nuclear X-ray source with a 2-10 keV luminosity of 4 * 10(exp 38) erg s(exp -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.


Descriptors :   *GALAXIES , *OPTICAL IMAGES , *SPACE SYSTEMS , *X RAYS , HIGH RESOLUTION , HOT GASES , INFRARED IMAGES , NUCLEI , OPTICAL DATA , STELLAR EVOLUTION , TELESCOPES


Subject Categories : Astronomy
      Optics
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE