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ISGRI: The INTEGRAL Soft Gamma-Ray Imager
Laurent, P.; Dzitko, H.; Lebrun, F. +21 more
For the first time in the history of high energy astronomy, a large CdTe gamma-ray camera is operating in space. ISGRI is the low-energy camera of the IBIS telescope on board the INTEGRAL satellite. This paper details its design and its in-flight behavior and performances. Having a sensitive area of 2621 cm2 with a spatial resolution of…
The chemical compositions of Galactic disc F and G dwarfs
Lambert, David L.; Allende Prieto, Carlos; Reddy, Bacham E. +1 more
Photospheric abundances are presented for 27 elements from carbon to europium in 181 F and G dwarfs from a differential local thermodynamic equilibrium (LTE) analysis of high-resolution and high signal-to-noise ratio spectra. Stellar effective temperatures (Teff) were adopted from an infrared flux method calibration of Strömgren photome…
Photospheric and heliospheric magnetic fields
Schrijver, Carolus J.; De Rosa, Marc L.
The magnetic field in the heliosphere evolves in response to the photospheric field at its base. This evolution, together with the rotation of the Sun, drives space weather through the continually changing conditions of the solar wind and the magnetic field embedded within it. We combine observations and simulations to investigate the sources of t…
The 2-10 keV luminosity as a Star Formation Rate indicator
Ranalli, P.; Comastri, A.; Setti, G.
Radio and far infrared luminosities of star-forming galaxies follow a tight linear relation. Making use of ASCA and BeppoSAX observations of a well-defined sample of nearby star-forming galaxies, we argue that tight linear relations hold between the X-ray, radio and far infrared luminosities. The effect of intrinsic absorption is investigated taki…
Discovery of a Binary Active Galactic Nucleus in the Ultraluminous Infrared Galaxy NGC 6240 Using Chandra
Kaastra, J. S.; Burwitz, V.; Hasinger, G. +3 more
Ultraluminous infrared galaxies (ULIRGs) are outstanding due to their huge luminosity output in the infrared, which is predominantly powered by superstarbursts and/or hidden active galactic nuclei (AGNs). NGC 6240 is one of the nearest ULIRGs and is considered a key representative of its class. Here we report the first high-resolution imaging spec…
A Census of the Young Cluster IC 348
Luhman, K. L.; Bouvier, J.; Stauffer, John R. +4 more
We present a new census of the stellar and substellar members of the young cluster IC 348. We have obtained images at I and Z for a 42'×28' field encompassing the cluster and have combined these measurements with previous optical and near-infrared photometry. From spectroscopy of candidate cluster members appearing in these d…
Interplanetary coronal mass ejections in the near-Earth solar wind during 1996-2002
Cane, H. V.; Richardson, I. G.
We summarize the occurrence of interplanetary coronal mass ejections (ICMEs) in the near-Earth solar wind during 1996-2002, corresponding to the increasing and maximum phases of solar cycle 23. In particular, we give a detailed list of such events. This list, based on in situ observations, is not confined to subsets of ICMEs, such as "magnetic clo…
High-Resolution X-Ray Spectroscopic Constraints on Cooling-Flow Models for Clusters of Galaxies
Kaastra, J. S.; Ferrigno, C.; Kahn, S. M. +5 more
We present high-resolution X-ray spectra of 14 putative cooling-flow clusters of galaxies obtained with the Reflection Grating Spectrometer on XMM-Newton. The clusters in the sample span a large range of temperatures and mass deposition rates. Various of these spectra exhibit line emission from O VIII, Ne X, Mg XII and XI, Al XIII and XII, Si XIV …
Quasars, their host galaxies and their central black holes
McLure, R. J.; Dunlop, J. S.; Hughes, D. H. +3 more
We present the final results from our deep Hubble Space Telescope (HST) imaging study of the host galaxies of radio-quiet quasars (RQQs), radio-loud quasars (RLQs) and radio galaxies (RGs). We describe and analyse new Wide Field & Planetary Camera 2 (WFPC2) R-band observations for 14 objects, which when combined with the first tranche of HST i…
SPI: The spectrometer aboard INTEGRAL
Boggs, S.; Knödlseder, J.; von Kienlin, A. +25 more
SPI is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory). It consists of an array of 19 closely packed germanium detectors surrounded by an active anticoincidence shield of BGO. The imaging capabilities of the instrument are obtained with a tungsten coded aperture mas…