Search Publications
Nuclear X-Ray Properties of the Peculiar Radio-loud Hidden AGN 4C+29.30
Cheung, C. C.; Stawarz, Ł.; Migliori, G. +4 more
We present results from a study of nuclear emission from a nearby radio galaxy, 4C+29.30, over a broad 0.5-200 keV X-ray band. This study used new XMM-Newton (~17 ks) and Chandra (~300 ks) data, and archival Swift/BAT data from the 58 month catalog. The hard (>2 keV) X-ray spectrum of 4C+29.30 can be decomposed into an intrinsic hard power law …
X-Ray Investigation of the Diffuse Emission around Plausible γ-Ray Emitting Pulsar Wind Nebulae in Kookaburra Region
Takahashi, Tadayuki; Bamba, Aya; Uchiyama, Yasunobu +2 more
We report on the results from Suzaku X-ray observations of the radio complex region called Kookaburra, which includes two adjacent TeV γ-ray sources HESS J1418-609 and HESS J1420-607. The Suzaku observation revealed X-ray diffuse emission around a middle-aged pulsar PSR J1420-6048 and a plausible pulsar wind nebula (PWN) Rabbit with elongated size…
The Observational and Theoretical Tidal Radii of Globular Clusters in M87
Sills, Alison; Harris, William E.; Webb, Jeremy J.
Globular clusters have linear sizes (tidal radii) which theory tells us are determined by their masses and by the gravitational potential of their host galaxy. To explore the relationship between observed and expected radii, we utilize the globular cluster population of the Virgo giant M87. Unusually deep, high signal-to-noise images of M87 are us…
Chandra Observations and Classification of Active Galactic Nucleus Candidates Correlated with Auger UHECRs
Zaw, Ingyin; Terrano, William A.; Farrar, Glennys R.
We report on Chandra X-ray observations of possible active galactic nuclei (AGNs) which have been correlated with ultrahigh energy cosmic rays (UHECRs) observed by the Pierre Auger Collaboration. Combining our X-ray observations with optical observations, we conclude that one-third of the 21 Veron-Cetty Veron (VCV) galaxies correlating with UHECRs…
Looking Deep into the Cat's Eye: Structure and Rotation in the Fast Wind of the PN Central Star of NGC 6543
Prinja, R. K.; Cantiello, M.; Massa, D. L.
We present HST/STIS time-series spectroscopy of the central star of the "Cat's Eye" planetary nebula NGC 6543. Intensive monitoring of the UV lines over a 5.8 hr period reveals well-defined details of large-scale structure in the fast wind, which are exploited to provide new constraints on the rotation rate of the central star. We derive character…
O VI Recombination Lines in Ultraviolet and Visible Spectra of RR Telescopii
Young, P. R.
Nineteen recombination lines of O VI are identified in ultraviolet and visible spectra of the symbiotic nova RR Telescopii at wavelengths between 1122 and 6203 Å. Only three of the lines have previously been reported from astronomical spectra, and eight lines have never been reported from either astronomical or laboratory spectra. The lines repres…
Discovery of a Pulsar Wind Nebula Candidate in the Cygnus Loop
Katsuda, Satoru; Petre, Robert; Uchida, Hiroyuki +4 more
We report on a discovery of a diffuse nebula containing a pointlike source in the southern blowout region of the Cygnus Loop supernova remnant, based on Suzaku and XMM-Newton observations. The X-ray spectra from the nebula and the pointlike source are well represented by an absorbed power-law model with photon indices of 2.2 ± 0.1 and 1.6 ± 0.2, r…
CARMA Follow-up of the Northern Unconfirmed Planck Galaxy Cluster Candidates
Carpenter, John; Sievers, Jonathan; Muchovej, Stephen +2 more
We present the Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of the three northern unconfirmed galaxy clusters discovered by the Planck satellite. We confirm the existence of two massive clusters (PLCKESZ G115.71+17.52 and PLCKESZ G121.11+57.01) at high significance. For these clusters, we present refined centroid l…
A Chandra Observation of the Ultraluminous Infrared Galaxy IRAS 19254-7245 (the Superantennae): X-Ray Emission from the Compton-thick Active Galactic Nucleus and the Diffuse Starburst
Heckman, Timothy M.; Reeves, James; Braito, Valentina +2 more
We present a Chandra observation of IRAS 19254-7245, a nearby ultraluminous infrared galaxy also known as the Superantennae. The high spatial resolution of Chandra allows us to disentangle for the first time the diffuse starburst (SB) emission from the embedded Compton-thick active galactic nucleus (AGN) in the southern nucleus. No AGN activity is…
Detection of Low-velocity Collisions in Saturn's F Ring
Cooper, N. J.; Murray, C. D.; Williams, G. A. +1 more
Jets of material extending several hundred kilometers from Saturn's F ring are thought to be caused by collisions at speeds of several tens of ms-1 between ~10 km diameter objects such as S/2004 S 6 and the core of the ring. The subsequent effects of Keplerian shear give rise to the multi-stranded nature of the F ring. Observations of t…