Search Publications
The Interaction of the Galactic Center Arches Cluster and the Thermal Filaments
Rubin, Robert H.; Colgan, Sean W. J.; Simpson, Janet P. +1 more
We present Infrared Space Observatory (ISO) measurements of the far-infrared (FIR) fine-structure lines [S IV] (10.5 µm), [S III] (33.5 µm), [O III] (51.8 and 88.4 µm), [N III] (57.3 µm), [N II] (121.9 µm), [O I] (63.2 and 145.5 µm), and [C II] (157.7 µm) at five positions on the thermal ``Arched'' Filamen…
The SDSS/XMM-Newton Quasar Sample. I. First Results
Elvis, Martin; Risaliti, Guido
We have searched in the XMM-Newton public archive for quasars in the Sloan Digital Sky Survey First Data Release and found 55 lying in the field of an XMM-Newton observation with exposure times >20 ks (as of 2004 August). The 35 quasars that yielded good X-ray spectra span redshifts from 0.5 to 2.5. The large collecting area of XMM-Newton allow…
A Deep Search with the Hubble Space Telescope for Late-Time Supernova Signatures in the Hosts of XRF 011030 and XRF 020427
Wood-Vasey, W. Michael; Ramirez-Ruiz, Enrico; Tanvir, Nial +16 more
X-ray flashes (XRFs) are, like gamma-ray bursts (GRBs), thought to signal the collapse of massive stars in distant galaxies. Many models posit that the isotropic equivalent energies of XRFs are lower than those for GRBs, such that they are visible from a reduced range of distances when compared with GRBs. Here we present the results of two-epoch H…
Discovery of Optical Emission in the Hot Spots of Three 3CR Quasars: High-Energy Particle Acceleration in Powerful Radio Hot Spots
Cheung, C. C.; Wardle, J. F. C.; Chen, Tingdong
Archival Hubble Space Telescope WFPC2 images were used to search for optical emission associated with the radio jets of a number of luminous quasars. From this search, we report new optical hot spot detections in the well-known blazar 3C 454.3 and the lobe-dominated quasars 3C 275.1 and 3C 336. We also find optical emission in the vicinity of the …
Fourier-Resolved Spectroscopy of the XMM-Newton Observations of MCG -06-30-15
Papadakis, I. E.; Akylas, A.; Kazanas, Demosthenes
We study the frequency-resolved spectra of the Seyfert galaxy MCG -06-30-15 obtained during two recent XMM-Newton observations. Splitting the Fourier spectra in soft (E<~2 keV) and hard (E>~2 keV) bands, we find that the soft band has a variability amplitude larger than the hard one on timescales longer than 10 ks, while the opposite is true…
X-Rays from Cepheus A East and West
Tsuboi, Yohko; Pravdo, Steven H.
We report the discovery of X-rays from both components of Cepheus A, East and West, with the XMM-Newton observatory. HH 168 joins the ranks of other energetic Herbig-Haro objects that are sources of T>=106 K X-ray emission. The effective temperature of HH 168 is T=5.8+3.5-2.3×106 K, and its unabsorbed…
Downscattering Due to Wind Outflows in Compact X-Ray Sources: Theory and Interpretation
Titarchuk, Lev; Shrader, Chris
A number of recent lines of evidence point toward the presence of hot, outflowing plasma from the central regions of compact Galactic and extragalactic X-ray sources. In addition, it has long been noted that many of these sources exhibit an ``excess'' continuum component above ~10 keV, usually attributed to Compton reflection from a static medium.…
Submillimeter Imaging of RCS J022434-0002.5: Intense Activity in a High-Redshift Cluster?
Gladders, M. D.; Ivison, R. J.; Hoekstra, H. +4 more
We present deep 850 µm imaging of the z=0.773 strong lensing galaxy cluster RCS J022434-0002.5 from the Red-Sequence Cluster Survey (RCS). These data are part of a larger submillimeter survey of RCS clusters with SCUBA on the JCMT. We find five objects at 850 µm, all of which are also detected at either 1.4 GHz or 450 µm, or both…
The Proto-Planetary Nebula M1-92 and the Symbiotic Star MWC 560: Two Evolutionary Phases of the Same Type of Object?
Torres-Peimbert, S.; Georgiev, L.; Arrieta, A.
Important similarities between the objects M1-92, a proto-planetary nebula of bipolar morphology, and MWC 560, a symbiotic star with a jet, have been found. A brief review of the previous studies for both objects is presented for the purpose of proposing mechanisms that best explain these similarities, since up to now both objects have been studie…
Chandra and XMM-Newton Observations of the Exceptional Pulsar B0628-28
Ögelman, H.; Tepedelenlıoǧlu, E.
PSR B0628-28 is a radio pulsar that was first detected in the X-ray band by ROSAT and then later observed with Chandra and XMM-Newton. The Chandra observation yielded an X-ray luminosity 2 orders of magnitude higher than what is expected for spin-powered pulsars; also, there were no pulsations detected. The XMM-Newton observation, however, reveals…