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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…
Solar Source Regions for 3He-rich Solar Energetic Particle Events Identified Using Imaging Radio, Optical, and Energetic Particle Observations
Pick, M.; Wang, L.; Mason, G. M. +2 more
We have identified the sources of six impulsive 3He-rich solar energetic particle events using imaging radio, optical, and energetic ion and electron data, together with calculated coronal fields obtained from extrapolating photospheric magnetograms using a potential field source surface (PFSS) model. These events were all studied in 20…
Two fluid effects on three-dimensional reconnection in the Swarthmore Spheromak Experiment with comparisons to space dataa)
Brown, M. R.; Cothran, C. D.; Fung, J.
Several new experimental results are reported from spheromak merging studies at the Swarthmore Spheromak Experiment [M. R. Brown, Phys. Plasmas 6, 1717 (1999)] with relevance to three-dimensional (3D) reconnection in laboratory and space plasmas. First, recent velocity measurements of impurity ions using ion Doppler spectroscopy are reported. Bidi…
Accretion and Nuclear Activity of Quiescent Supermassive Black Holes. II. Optical Study and Interpretation
Elvis, M.; Graham, Alister W.; Pellegrini, S. +5 more
Our X-ray study of the nuclear activity in a new sample of six quiescent early-type galaxies, as well as in a larger sample from the literature, confirmed (Paper I) that the Bondi accretion rate of diffuse hot gas is not a good indicator of the SMBH X-ray luminosity. Here we suggest that a more reliable estimate of the accretion rate must include …