A Chandra High-Resolution X-ray Image of Centaurus A

We present first results from a Chandra X-Ray Observatory observation of the radio galaxy Centaurus A with the High-Resolution Camera. All previously reported major sources of X-ray emission including the bright nucleus, the jet, individual point sources, and diffuse emission are resolved or detected. The spatial resolution of this observation is better than 1&arcsec; in the center of the field of view and allows us to resolve X-ray features of this galaxy not previously seen. In particular, we resolve individual knots of emission in the inner jet and diffuse emission between the knots. All of the knots are diffuse at the 1&arcsec; level, and several exhibit complex spatial structure. We find the nucleus to be extended by a few tenths of an arcsecond. Our image also suggests the presence of an X-ray counterjet. Weak X-ray emission from the southwest radio lobe is also seen, and we detect 63 pointlike galactic sources (probably X-ray binaries and supernova remnants) above a luminosity limit of approximately 1.7x1037 ergs s-1.

[1]  John H. Chappell,et al.  Performance and calibration of the AXAF High-Resolution Camera II: the spectroscopic detector , 1997, Optics & Photonics.

[2]  Dayton L. Jones,et al.  Discovery of a Subparsec Radio Counterjet in the Nucleus of Centaurus A , 1996, astro-ph/9606023.

[3]  John H. Chappell,et al.  Performance and calibration of the AXAF High-Resolution Camera I: imaging readout , 1997, Optics & Photonics.

[4]  Martin V. Zombeck,et al.  Orbital performance of the high-resolution imager (HRI) on ROSAT , 1995, Optics & Photonics.

[5]  E. Feigelson,et al.  The inner radio structure of Centaurus A - Clues to the origin of the jet X-ray emission , 1983 .

[6]  John H. Chappell,et al.  AXAF High-Resolution Camera (HRC): calibration and recalibration at XRCF and beyond , 1997, Optics & Photonics.

[7]  C. Jones,et al.  Matched Filter Source Detection Applied to the ROSAT PSPC and the Determination of the Number-Flux Relation , 1995 .

[8]  J. Hough,et al.  Evidence for a 20 Parsec Disk at the Nucleus of Centaurus A , 1998, astro-ph/9804098.

[9]  D. Geisler,et al.  Metal Abundances From Washington Photometry of Globular Clusters in NGC 5128 , 1992 .

[10]  F. P. Israel.  Centaurus A – NGC 5128 , 1998 .

[11]  F. Anselmo,et al.  The X-ray structure of Centaurus A from 0. 1 to 50 keV observations with Exosat , 1989 .

[12]  E. Feigelson,et al.  Einstein observations of the X-ray structure of Centaurus A - Evidence for the radio-lobe energy source , 1979 .

[13]  Stephen S. Murray,et al.  The AXAF High Resolution Camera , 1988, Optics & Photonics.

[14]  Martin C. Weisskopf,et al.  Advanced X-ray Astrophysics Facility (AXAF): an overview , 1995, Optics & Photonics.

[15]  S. Bowyer,et al.  The Discovery of Optical Emission Knots in the Inner Jet of Centaurus A , 1983 .

[16]  P. Gorenstein,et al.  Measurements of X-ray scattering from interstellar grains , 1986 .

[17]  Martin Elvis,et al.  The AXAF high resolution camera (HRC) and its use for observations of distant clusters of galaxies , 1987 .

[18]  E. Feigelson,et al.  The X-ray structure of Centaurus A , 1981 .

[19]  Ulrich G. Briel,et al.  The Einstein /HEAO 2/ X-ray Observatory , 1979 .

[20]  S. Bergh.  The post-eruptive galaxy NGC 5128 = Centaurus A , 1976 .

[21]  D. Schiminovich,et al.  DISCOVERY OF NEUTRAL HYDROGEN ASSOCIATED WITH THE DIFFUSE SHELLS OF NGC 5128 (CENTAURUS-A) , 1994 .

[22]  M. Norman,et al.  VLA Observations of the Inner Lobes of Centaurus A , 1992 .

[23]  A. Fabian.  Electron scattering in X ray-emitting galaxies , 1977, Nature.

[24]  C. Jones,et al.  Wavelet transform analysis of the small-scale X-ray structure of the cluster Abell 1367 , 1995 .

[25]  K. Nandra,et al.  Deconvolution of the X-Ray Emission and Absorption Components in Centaurus A , 1997 .

[26]  Duccio Macchetto,et al.  Unveiling the Active Nucleus of Centaurus A , 1999 .