Search Publications
Isolated X-Ray-Infrared Sources in the Region of Interaction of the Supernova Remnant IC 443 with a Molecular Cloud
Bocchino, F.; Pavlov, G. G.; Bykov, A. M. +5 more
The nature of the extended hard X-ray source XMMU J061804.3+222732 and its surroundings is investigated using XMM-Newton, Chandra, and Spitzer observations. This source is located in an interaction region of the IC 443 supernova remnant with a neighboring molecular cloud. The X-ray emission consists of a number of bright clumps embedded in an exte…
Prominence Seismology: Wavelet Analysis of Filament Oscillations
Isobe, Hiroaki; Tripathi, Durgesh; Pintér, Balázs +1 more
The temporal and spatial behavior of a large-amplitude filament oscillation is investigated using wavelet analysis. The extreme-ultraviolet (EUV) images of the phenomenon, which occurred on 2002 October 15, were taken from the EUV Imaging Telescope on board the Solar and Heliospheric Observatory (SOHO). The wavelet spectra, extracted from the inte…
Near-Infrared Adaptive Optics Imaging of High-Redshift Quasars
Uslenghi, Michela; Scarpa, Riccardo; Treves, Aldo +2 more
The properties of high-redshift quasar host galaxies are studied in order to investigate the connection between galaxy evolution, nuclear activity, and the formation of supermassive black holes. We combine new near-IR observations of three high-redshift quasars (2 < z < 3), obtained at the ESO Very Large Telescope equipped with adaptive opti…
Probing the Relation Between X-Ray-Derived and Weak-Lensing-Derived Masses for Shear-Selected Galaxy Clusters. I. A781
Hughes, John P.; Sehgal, Neelima; Tyson, J. Anthony +4 more
We compare X-ray and weak-lensing masses for four galaxy clusters that comprise the top-ranked shear-selected cluster system in the Deep Lens Survey. The weak-lensing observations of this system, which is associated with A781, are from the Kitt Peak Mayall 4 m telescope, and the X-ray observations are from both Chandra and XMM-Newton. For a faithf…
The Subaru/XMM-Newton Deep Survey (SXDS). V. Optically Faint Variable Object Survey
Ouchi, Masami; Wang, Lifan; Ueda, Yoshihiro +19 more
We present our survey for optically faint variable objects using multiepoch (8-10 epochs over 2-4 years) i'-band imaging data obtained with Subaru Suprime-Cam over 0.918 deg2 in the Subaru/XMM-Newton Deep Field (SXDF). We found 1040 optically variable objects by image subtraction for all the combinations of images at different epochs. T…
A Hot Microflare Observed with RHESSI and Hinode
Milligan, Ryan O.
RHESSI and Hinode observations of a GOES B-class flare are combined to investigate the origin of 15 MK plasma. The absence of any detectable hard X-ray emission coupled with weak blueshifted emission lines (indicating upward velocities averaging only 14 km s-1) suggests that this was a result of direct heating in the corona, as opposed …
Hubble Space Telescope STIS Spectroscopy of Long-Period Dwarf Novae in Quiescence
Szkody, Paula; Sion, Edward M.; Godon, Patrick +5 more
We present the results of a synthetic spectral analysis of HST STIS spectra of five long-period dwarf novae obtained during their quiescence to determine the properties of their white dwarfs, which are little known for systems above the CV period gap. The five systems, TU Men, BD Pav, SS Aur, TT Crt, and V442 Cen, were observed as part of an HST S…
The Evolution of Circumstellar Disks in Ophiuchus Binaries
Jensen, E. L. N.; Patience, J.; Akeson, R. L.
Four Ophiuchus binaries, two Class I systems and two Class II systems, with separations of ~450-1100 AU, were observed with the Owens Valley Radio Observatory (OVRO) millimeter interferometer. In each system, the 3 mm continuum maps show dust emission at the location of the primary star, but no emission at the position of the secondary. This resul…
A Hard X-Ray View of Two Distant VHE Blazars: 1ES 1101-232 and 1ES 1553+113
Reimer, A.; Reimer, O.; Costamante, L. +2 more
TeV blazars are known as prominent nonthermal emitters across the entire electromagnetic spectrum with their photon power peaking in the X-ray and TeV bands. If distant, absorption of γ-ray photons by the extragalactic background light (EBL) alters the intrinsic TeV spectral shape, thereby affecting the overall interpretation. Suzaku observations …
Orbital Parameters and Chemical Composition of Four White Dwarfs in Post-Common-Envelope Binaries
Vennes, Stéphane; Lanz, Thierry; Chayer, Pierre +2 more
We present FUSE observations of the hot white dwarfs in the post-common-envelope binaries Feige 24, EUVE J0720-317, BPM 6502, and EUVE J2013+400. The spectra show numerous photospheric absorption lines, which trace the white dwarf orbital motion. We report the detection of C III, O VI, P V, and Si IV in the spectra of Feige 24, EUVE J0720-317, and…