Search Publications
Missions
Journals
Publication Years
Self-similarity of temperature profiles in distant galaxy clusters: the quest for a universal law
Molendi, S.; Gastaldello, F.; Ettori, S. +1 more
Context. We present the XMM-Newton temperature profiles of 12 bright (LX > 4 × 1044 erg s-1) clusters of galaxies at 0.4 < z < 0.9, having an average temperature in the range 5 ≲ kT ≲ 11 keV.
Aims: The main goal of this paper is to study for the first time the temperature profiles of a sample of high-…
Localizing INTEGRAL Sources with Chandra: X-Ray and Multi-wavelength Identifications and Energy Spectra
Rahoui, Farid; Kalemci, Emrah; Bodaghee, Arash +5 more
We report on Chandra observations of 18 hard X-ray (>20 keV) sources discovered with the INTEGRAL satellite near the Galactic plane. For 14 of the INTEGRAL sources, we have uncovered one or two potential Chandra counterparts per source. These provide soft X-ray (0.3-10 keV) spectra and subarcsecond localizations, which we use to identify counte…
X-Raying the Beating Heart of a Newborn Star: Rotational Modulation of High-energy Radiation from V1647 Ori
Hamaguchi, Kenji; Petre, Robert; Kastner, Joel H. +5 more
We report a periodicity of ~1 day in the highly elevated X-ray emission from the protostar V1647 Ori during its two recent multiple-year outbursts of mass accretion. This periodicity is indicative of protostellar rotation at near-break-up speed. Modeling of the phased X-ray light curve indicates that the high-temperature (~50 MK), X-ray-emitting p…
Toward Identifying the Unassociated Gamma-Ray Source 1FGL J1311.7-3429 with X-Ray and Optical Observations
Cheung, C. C.; Kataoka, J.; Kawai, N. +9 more
We present deep optical and X-ray follow-up observations of the bright unassociated Fermi-LAT gamma-ray source 1FGL J1311.7-3429. The source was already known as an unidentified EGRET source (3EG J1314-3431, EGR J1314-3417), hence its nature has remained uncertain for the past two decades. For the putative counterpart, we detected a quasi-sinusoid…
Discovery of a Significant Magnetic Cataclysmic Variable Population in the Limiting Window
van den Berg, Maureen; Grindlay, Jonathan E.; Servillat, Mathieu +2 more
We have discovered 10 periodic X-ray sources from the 1 Ms Chandra ACIS observation of the Limiting Window (LW), a low-extinction region (AV ~ 3.9) at 1fdg4 south of the Galactic center. The observed periods (~1.3-3.4 hr) and the X-ray luminosities (1031.8-32.9 erg s-1 at 8 kpc) of the 10 periodic sources, combined…
Using SDO's AIA to investigate energy transport from a flare's energy release site to the chromosphere
Brosius, J. W.; Holman, G. D.
Context. Coordinated observations of a GOES B4.8 microflare with SDO's Atmospheric Imaging Assembly (AIA) and the Ramaty High Energy Solar Spectroscopic Imager (RHESSI) on 2010 July 31 show that emission in all seven of AIA's EUV channels brightened simultaneously nearly 6 min before RHESSI or GOES detected emission from plasma at temperatures aro…
X-Ray Binaries in the Ultrahigh Encounter Rate Globular Cluster NGC 6388
Heinke, Craig O.; Bailyn, Charles D.; Cohn, Haldan N. +5 more
We report the results of a joint Chandra Hubble Space Telescope study of the X-ray binary (XRB) population in the massive, high-density globular cluster NGC 6388. NGC 6388 has one of the highest predicted XRB production rates of any Galactic cluster. We detected a large population of 61 Chandra sources within the half-mass radius with LX
Residual cooling and persistent star formation amid active galactic nucleus feedback in Abell 2597
Fabian, A. C.; Combes, F.; Salomé, P. +18 more
New Chandra X-ray and Herschel Far-Infrared (FIR) observations enable a multiwavelength study of active galactic nucleus (AGN) heating and intracluster medium (ICM) cooling in the brightest cluster galaxy (BCG) of Abell 2597 (z= 0.0821). The new Chandra observations reveal the central ≲30 kpc X-ray cavity network to be more extensive than previous…
Hydrogen density in the dayside venusian exosphere derived from Lyman-α observations by SPICAV on Venus Express
Bertaux, J. -L.; Chaufray, J. -Y.; Leblanc, F. +2 more
A series of observations of the venusian hydrogen corona made by SPICAV on Venus Express are analyzed to estimate the amount of hydrogen in the exosphere of Venus. These observations were made between November 2006 and July 2007 at altitudes from 1000 km to 8000 km on the dayside. The Lyman-α brightness profiles derived are reproduced by the sum o…
Multiscale Dynamics of Solar Magnetic Structures
Davila, Joseph M.; Uritsky, Vadim M.
Multiscale topological complexity of the solar magnetic field is among the primary factors controlling energy release in the corona, including associated processes in the photospheric and chromospheric boundaries. We present a new approach for analyzing multiscale behavior of the photospheric magnetic flux underlying these dynamics as depicted by …