Search Publications
Properties of X-ray rich gamma ray bursts and X-ray flashes detected with BeppoSAX and Hete-2
Piro, L.; Rossi, E. M.; D'Alessio, V.
We study the spectrum of the prompt emission and the X-ray and optical afterglow fluxes of 54 X-Ray Rich Gamma Ray Burst (XRRs) and X-Ray Flashes (XRFs), observed by BeppoSAX and HETE-2. A comparison is then performed with classical Gamma Ray Bursts (GRBs). The goal of this paper is to investigate the nature of XRRs/XRFs, as high redshift GRBs or …
The star formation history of luminous infrared galaxies
Elbaz, D.; Cesarsky, C.; Charlot, S. +5 more
Aims.We constrain the past star formation histories of a sample of 25 distant (bar{z}∼ 0.7) luminous infrared galaxies (LIRGs) detected with the mid infrared cameras ISOCAM and MIPS onboard the ISO and Spitzer satellites.
Methods: .We used high-resolution VLT-FORS2 spectroscopy in addition to a comprehensive library of 200 000 model optical sp…
The Secondaries of Solar-Type Primaries. I. The Radial Velocities
Abt, Helmut A.; Willmarth, Daryl
We studied for duplicity the 167 F7-G8 IV or V primaries within 25 pc of the Sun according to their Hipparcos parallaxes and between declinations of -30° and +75°. We obtained an average of 13 coudé radial velocities with an accuracy of +/-0.10 km s-1. Combining these measures with published data, we obtained 39 single-lined and 12 doub…
Derivation of planetary topography using multi-image shape-from-shading
Kirk, Randolph L.; Lohse, Volker; Heipke, Christian
In many cases, the derivation of high-resolution digital terrain models (DTMs) from planetary surfaces using conventional digital image matching is a problem. The matching methods need at least one stereo pair of images with sufficient texture. However, many space missions provide only a few stereo images and planetary surfaces often possess insuf…
Multiwavelength Variability of the Magnetar 4U 0142+61
Durant, Martin; van Kerkwijk, Marten H.
We have collected data spanning seven years of observations of the magnetar 4U 0142+61 in the infrared, optical, and soft X-rays. These combine our own observations and analysis of archival data. We find that the source is variable in the optical, in contrast to what had been previously reported, that the K-band flux can vary by over a magnitude o…
Can Ejecta-dominated Supernova Remnants be Typed from Their X-Ray Spectra? The Case of G337.2-0.7
Gelfand, Joseph D.; Hughes, John P.; Gaensler, B. M. +3 more
In this paper we use recent X-ray and radio observations of the ejecta-rich Galactic SNR G337.2-0.7 to determine properties of the SN explosion that formed this source. H I absorption measurements from ATCA constrain the distance to G337.2-0.7 to lie between 2.0+/-0.5 and 9.3+/-0.3 kpc. Combined with a clear radio image of the outer blast wave, th…
Detailed XMM-Newton Observation of the Cluster of Galaxies Abell 1060
Ishida, Manabu; Hoshino, Akio; Ohashi, Takaya +3 more
We present results from an XMM-Newton observation of the non-cooling flow cluster Abell 1060. The large effective area of XMM-Newton enabled us to investigate the nature of this cluster in unprecedented detail. >From the observed surface brightness distribution, we found that the gravitational mass distribution is well described by the Navarro-…
A global magnetic model of Saturn's magnetosphere and a comparison with Cassini SOI data
Alexeev, I. I.; Belenkaya, E. S.; Nichols, J. D. +4 more
A re-scaling of a recent model of Jupiter's magnetosphere incorporating ring current, magnetopause, and tail current systems is used as a starting-point for modeling Saturn's magnetospheric field. The model is compared with observations obtained by Cassini during its Saturn orbit insertion fly-through of Saturn's magnetosphere, and is shown to giv…
XMM-Newton Observations of High-Redshift Quasars
Grupe, D.; Mathur, S.; Wilkes, B. +1 more
We report on our XMM-Newton observations of the high-redshift quasars BR 2237-0607 (z=4.558) and BR 0351-1034 (z=4.351). We also report on XMM-Newton observations of 19 other z>4 objects available in the public archive of which 14 were detected. We find that the optical to X-ray spectral index αox is correlated with the luminosity density at 25…
Evidence for Surface Cooling Emission in the XMM-Newton Spectrum of the X-Ray Pulsar PSR B2334+61
Cropper, M.; McGowan, K. E.; Zane, S. +2 more
We report on the first XMM-Newton observation of the Vela-like pulsar PSR B2334+61. Spectral analysis reveals soft X-ray emission, with the bulk of the photons emitted at energies below ~1.5 keV. We find that the spectrum has a thermal origin and is well-fitted with either a blackbody or a magnetized, pure H atmospheric model. In the latter case, …