Search Publications
The Swift BAT Survey Detects Two Optical Broad Line, X-Ray Heavily Obscured Active Galaxies: NVSS 193013+341047 and IRAS 05218-1212
Reynolds, Christopher S.; Mushotzky, Richard F.; Winter, Lisa M. +2 more
The Swift Burst Alert Telescope (BAT) is discovering interesting new objects while monitoring the sky in the 14-195 keV band. Here we present the X-ray properties and spectral energy distributions (SEDs) for two unusual active galactic nucleus sources. Both NVSS 193013+341047 and IRAS 05218-1212 are absorbed, Compton-thin, but heavily obscured (N …
Investigating the Optical Counterpart Candidates of Four INTEGRAL Sources Localized with Chandra
Rahoui, Farid; Kalemci, Emrah; Bodaghee, Arash +5 more
We report on the optical spectroscopic follow-up observations of the candidate counterparts to four INTEGRAL sources: IGR J04069+5042, IGR J06552-1146, IGR J21188+4901, and IGR J22014+6034. The candidate counterparts were determined with Chandra, and the optical observations were performed with 1.5 m RTT-150 telescope (TÜBİTAK National Observatory…
Coronal Mass Ejection Reconstruction from Three Viewpoints via Simulation Morphing. I. Theory and Examples
Frazin, Richard A.
The problem of reconstructing the three-dimensional (3D) density distribution of a coronal mass ejection (CME) from three simultaneous coronagraph observations is timely in that the COR1 and COR2 coronagraphs on the dual-spacecraft STEREO mission complement the LASCO coronagraphs on the SOHO satellite and the Mk4 on Mauna Loa. While the separation…
Erratum: "The Herschel and IRAM CHESS Spectral Surveys of the Protostellar Shock L1157-B1: Fossil Deuteration" (2012, ApJ, 757, L9)
Codella, C.; Ceccarelli, C.; Caselli, P. +9 more
Global Optimization Methods for Gravitational Lens Systems with Regularized Sources
Rogers, Adam; Fiege, Jason D.
Several approaches exist to model gravitational lens systems. In this study, we apply global optimization methods to find the optimal set of lens parameters using a genetic algorithm. We treat the full optimization procedure as a two-step process: an analytical description of the source plane intensity distribution is used to find an initial appro…
Constraints on the Ubiquity of Coronal X-Ray Cycles
Wright, Nicholas J.; Hoffman, John; Günther, Hans M.
Stellar activity cycles are known to be a widespread phenomenon amongst moderately active solar- and late-type stars from long-term periodic variations in chromospheric Ca II H and K emission lines, yet to date, only a handful of coronal X-ray cycles are known. We have surveyed serendipitously observed stellar sources in fields observed multiple t…
The X-Ray Transient 2XMMi J003833.3+402133: A Candidate Magnetar at High Galactic Latitude
Callingham, J. R.; Farrell, S. A.; Gaensler, B. M. +2 more
We present detailed analysis of the transient X-ray source 2XMMi J003833.3+402133 detected by XMM-Newton in 2008 January during a survey of M31. The X-ray spectrum is well fitted by either a steep power law plus a blackbody model or a double blackbody model. Prior observations with XMM-Newton, Chandra, Swift, and ROSAT spanning 1991-2007, as well …
Erratum: "Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347" (2012, ApJ, 756, 149)
Acero, Fabio; Klochkov, Dmitry; Bamba, Aya +7 more
Foreground Predictions for the Cosmic Microwave Background Power Spectrum from Measurements of Faint Inverted Radio Sources at 5 GHz
White, Richard L.; Becker, Robert H.; Schneider, Michael D. +1 more
We present measurements of a population of matched radio sources at 1.4 and 5 GHz down to a flux limit of 1.5 mJy in 7 deg2 of the NOAO Deep Field South. We find a significant fraction of sources with inverted spectral indices that all have 1.4 GHz fluxes less than 10 mJy and are therefore too faint to have been detected and included in…
Are Pulsing Solitary Waves Running inside the Sun?
Wolff, Charles L.
A precise sequence of frequencies—detected four independent ways—is interpreted as a system of solitary waves below the Sun's convective envelope. Six future observational or theoretical tests of this idea are suggested. Wave properties (rotation rates, radial energy distribution, nuclear excitation strength) follow from conventional dynamics of g…