Search Publications
Identifications of Four INTEGRAL Sources in the Galactic Plane via Chandra Localizations
Kaaret, Philip; Walter, Roland; Tomsick, John A. +3 more
Hard X-ray imaging of the Galactic plane by the INTEGRAL satellite is uncovering large numbers of 20-100 keV ``IGR'' sources. We present results from Chandra, INTEGRAL, optical, and IR observations of four IGR sources: three sources in the Norma region of the Galaxy (IGR J16195-4945, IGR J16207-5129, and IGR J16167-4957) and one that is closer to …
Constraint on the post-Newtonian parameter γ on galactic size scales
Bolton, Adam S.; Burles, Scott; Rappaport, Saul
We constrain the post-Newtonian gravity parameter γ on kiloparsec scales by comparing the masses of 15 elliptical lensing galaxies from the Sloan Lens ACS Survey as determined in two independent ways. The first method assumes only that Newtonian gravity is correct and is independent of γ, while the second uses gravitational lensing which depends o…
Dense, Fe-rich Ejecta in Supernova Remnants DEM L238 and DEM L249: A New Class of Type Ia Supernova?
Reynolds, Stephen P.; Borkowski, Kazimierz J.; Hendrick, Sean P.
We present observations of two LMC supernova remnants (SNRs), DEM L238 and DEM L249, with the Chandra and XMM-Newton X-ray satellites. Bright central emission, surrounded by a faint shell, is present in both remnants. The central emission has an entirely thermal spectrum dominated by strong Fe L-shell lines, with the deduced Fe abundance in excess…
XMM-Newton high-resolution spectroscopy reveals the chemical evolution of M 87
Böhringer, H.; Simionescu, A.; Kaastra, J. S. +3 more
We present a study of chemical abundances in the giant elliptical galaxy M 87 using high-resolution spectra obtained with the Reflection Grating Spectrometers during two deep XMM-Newton observations. While we confirm the two-temperature structure of the inter-stellar medium (ISM) in M 87, we also show that a continuous temperature distribution des…
Multifrequency VLBA monitoring of 3C 273 during the INTEGRAL Campaign in 2003. I. Kinematics of the parsec scale jet from 43 GHz data
Tornikoski, M.; Wiik, K.; Savolainen, T. +1 more
In this first of a series of papers describing polarimetric multifrequency Very Long Baseline Array (VLBA) monitoring of
Confirming the high velocity outflow in PG1211+143
Page, K. L.; Pounds, K. A.
An XMM-Newton observation of the bright quasi-stellar object PG1211+143 was previously reported to show evidence for a massive, energetic outflow, with an outflow velocity of v ~ 0.1c based on the identification of blueshifted absorption lines detected in both EPIC and Reflection Grating Spectrometer (RGS) spectra. Subsequently, an order of magnit…
Hubble Space Telescope observations of the nucleus and inner coma of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Gutiérrez, P. J. +3 more
Context: .Following the postponement of the launch of the Rosetta spacecraft scheduled in January 2003, comet 67P/Churyumov-Gerasimenko emerged as the most suitable new target. However a critical issue was the size, that is, the mass of its nucleus, as the surface module Philae was designed to land on a nucleus with a radius no larger than approxi…
The First XMM-Newton Observations of the Soft Gamma-Ray Repeater SGR 1900+14
Tiengo, A.; Götz, D.; Mereghetti, S. +6 more
A ~50 ks XMM-Newton observation of SGR 1900+14 has been carried out in 2005 September, after almost 3 yr during which no bursts were detected from this soft gamma-ray repeater. The 0.8-10 keV spectrum was well fit by a power law plus blackbody model with photon index Γ=1.9+/-0.1, temperature kT=0.47+/-0.02 keV, and NH=(2.12+/-0.08)×10
Wave-Number Spectra and Intermittency in the Terrestrial Foreshock Region
Glassmeier, K. -H.; Narita, Y.; Treumann, R. A.
Wave-number spectra of magnetic field fluctuations are directly determined in the terrestrial foreshock region (upstream of a quasiparallel collisionless shock wave) using four-point Cluster spacecraft measurements. The spectral curve is characterized by three ranges reminiscent of turbulence: energy injection, inertial, and dissipation range. The…
Radar subsurface mapping of the polar layered deposits on Mars
Phillips, Roger J.; Nunes, Daniel Cahn
Determining the three-dimensional (3-D) structure of the Martian polar caps is fundamental to understanding their hydrologic history, dynamic behavior, past climatic changes, and the underlying lithosphere, and radar sounding is the most promising technique to do so. We model the dielectric profile of the Martian polar layered deposits (PLD), appl…