395 citations · 7.9k across the 186 of their papers we have counts for
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"Normal" FRII Radio Galaxies as a Probe of the Nature of X-Shaped Radio Sources
Dharam Vir Lal, Martin J. Hardcastle, Ralph P. Kraft
We present a multiwavelength radio study of a sample of nearby Fanaroff-Riley class II (FRII) radio galaxies, matched with the sample of known X-shaped radio sources in size, morph…
GMRT study of X-shaped radio sources
Dharam Vir Lal, A. Pramesh Rao, Martin J. Hardcastle +5
Context. The nature of X-shaped sources is a matter of considerable debate in the literature: it has even been proposed that they provide evidence for black-hole-mergers/spin-reori…
XMM-Newton Observations of the Nuclei of the Radio Galaxies 3C 305, DA 240, and 4C 73.08
Daniel A. Evans, Martin J. Hardcastle, Julia C. Lee +4
We present new XMM-Newton EPIC observations of the nuclei of the nearby radio galaxies 3C 305, DA 240, and 4C 73.08, and investigate the origin of their nuclear X-ray emission. The…
Evidence for Non-Hydrostatic Gas Motions in the Hot ISM of Centaurus A
R. P. Kraft, M. J. Hardcastle, G. R. Sivakoff +16
We present preliminary results from a deep (600 ks) {\em Chandra} observation of the hot interstellar medium of the nearby early-type galaxy Centaurus A (Cen A). We find a surface…
A Radio Through X-ray Study of the Jet/Companion-Galaxy Interaction in 3C 321
Daniel A. Evans, Wen-Fai Fong, Martin J. Hardcastle +6
We present a multiwavelength study of the nucleus, environment, jets, and hotspots of the nearby FRII radio galaxy 3C 321, using new and archival data from MERLIN, the VLA, Spitzer…
Globular Clusters and X-ray Point Sources in Centaurus A (NGC 5128)
Kristin A. Woodley, Somak Raychaudhury, Ralph P. Kraft +6
We detect 353 X-ray point sources, mostly low-mass X-ray binaries (LMXBs), in four Chandra observations of Centaurus A (NGC 5128), the nearest giant early-type galaxy, and correlat…
Where Centaurus A gets its X-ray knottiness
D. M. Worrall, M. Birkinshaw, R. P. Kraft +15
We report an X-ray spectral study of the transverse structure of the Centaurus A jet using new data from the Chandra Cen A Very Large Project. We find that the spectrum steepens wi…
The Active Nucleus of IC4970: A Nearby Example of Merger-Induced Cold-Gas Accretion
M. E. Machacek, R. P. Kraft, M. L. N. Ashby +3
We present results from Chandra X-ray and Spitzer mid-infrared observations of the interacting galaxy pair NGC6872/IC4970 in the Pavo galaxy group and show that the smaller compani…
New results on particle acceleration in the Centaurus A jet and counterjet from a deep Chandra observation
M. J. Hardcastle, R. P. Kraft, G. R. Sivakoff +16
We present new deep Chandra observations of the Centaurus A jet, with a combined on-source exposure time of 719 ks. These data allow detailed X-ray spectral measurements to be made…
A Chandra Study of the Lobe/ISM Interactions Around the Inner Radio Lobes of Centaurus A: Constraints on the Temperature Structure and Transport Processes
R. P. Kraft, P. E. J. Nulsen, M. Birkinshaw +6
We present results from deeper {\em Chandra} observations of the southwest radio lobe of Centaurus A, first described by Kraft et al. (2003). We find that the sharp X-ray surface b…
Shock heating in the nearby radio galaxy NGC 3801
J. H. Croston, R. P. Kraft, M. J. Hardcastle
We report the Chandra detection of shock-heated shells of hot gas surrounding the radio lobes of the nearby (D_L ~ 53 Mpc) low-power radio galaxy NGC 3801. The shells have temperat…
Shock heating by nearby AGN
J. H. Croston, R. P. Kraft, M. J. Hardcastle
Shock heating by radio jets is potentially an important process in a range of environments, as it will increase the entropy of the heated gas. Although this process is expected to…
X-ray Constraints on Galaxy-Gas-Jet Interactions in the Dumbbell Galaxies NGC4782 and NGC4783 in the LGG316 Group
M. E. Machacek, R. P. Kraft, C. Jones +2
We present results from a 49.3 ks Chandra X-ray observation of the strongly interacting dumbbell galaxies NGC4782(3C278) and NGC4783 that constrain the kinematics of the interactio…
The Chandra, HST, and VLA View of the Circumnuclear Extended Emission in the Narrow Emission Line Galaxy NGC 2110
Daniel A. Evans, Julia C. Lee, Maria Kamenetska +4
We present results from new Chandra and archival HST and VLA imaging observations of the circumnuclear extended emission in the nearby Type 2 Seyfert galaxy NGC 2110. We find resol…
Filaments, Bubbles, and Weak Shocks in the Gaseous Atmosphere of M87
W. Forman, E. Churazov, C. Jones +10
We present the first results from a 500 ksec Chandra ACIS-I observation of M87. At soft energies (0.5-1.0 keV), we detect filamentary structures associated with the eastern and sou…
The infrared jet in Centaurus A: multiwavelength constraints on emission mechanisms and particle acceleration
M. J. Hardcastle, R. P. Kraft, D. M. Worrall
We report on Spitzer and Gemini observations of the jet of Centaurus A in the infrared, which we combine with radio, ultraviolet and X-ray data. Spitzer detects jet emission from a…
The complex X-ray morphology of NGC 7618: A major group-group merger in the local Universe?
R. P. Kraft, C. Jones, P. E. J. Nulsen +1
We present results from a short {\em Chandra}/ACIS-S observation of NGC 7618, the dominant central galaxy of a nearby (=0.017309, d=74.1 Mpc) group. We detect a sharp surface br…
Chandra and XMM-Newton Observations of a Sample of Low-Redshift FRI and FRII Radio-Galaxy Nuclei
D. A. Evans, D. M. Worrall, M. J. Hardcastle +2
We present spectral results, from Chandra and XMM-Newton observations, of a sample of 22 low-redshift (z < 0.1) radio galaxies, and consider whether the core emission originates fr…
The Hot Gas Environment of the Radio Galaxy 3C 388: Quenching the Accumulation of Cool Gas in a Cluster Core by a Nuclear Outburst
R. P. Kraft, J. Azcona, W. R. Forman +3
We present results from a 35 ks {\em Chandra}/ACIS-I observation of the hot ICM around the FR II radio galaxy 3C 388. 3C 388 resides in a cluster environment with an ICM temperatur…
A Chandra Observation of the Nearby Lenticular Galaxy NGC 5102: Where are the X-ray Binaries?
R. P. Kraft, L. A. Nolan, T. J. Ponman +2
We present results from a 34 ks Chandra/ACIS-S observation of the nearby (d=3.1 Mpc) lenticular galaxy NGC 5102, previously shown to have an unusually low X-ray luminosity. We dete…
Cen A and its interaction with the x-ray emitting interstellar medium
D. M. Worrall, R. P. Kraft, M. Birkinshaw +4
As the closest radio galaxy, Centaurus A is a powerful laboratory for the X-ray study of radio-emitting structures and their interactions with the hot interstellar medium (ISM). Th…
Infall of the Elliptical Galaxy NGC 1404 into the Fornax Cluster
M. Machacek, A. Dosaj, W. Forman +5
We use three Chandra observations, totalling 134.3 ks, to constrain the dynamical motion of NGC1404 falling towards the dominant elliptical NGC1399 through the Fornax ICM. NGC1404'…
Hot Gas Structure in the Elliptical Galaxy NGC 4472
B. A. Biller, C. Jones, W. R. Forman +2
We present X-ray spectroscopic and morphological analyses using Chandra ACIS and ROSAT observations of the giant elliptical galaxy NGC 4472 in the Virgo cluster. We discuss previou…
Chandra and XMM-Newton Observations of the Nucleus of Centaurus A
D. A. Evans, R. P. Kraft, D. M. Worrall +4
We present X-ray spectra of the nucleus of the nearby radio galaxy Centaurus A from observations with the XMM-Newton EPIC CCD cameras (two exposures separated by 12 months) and the…