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Orientation, location, and velocity of Saturn's bow shock: Initial results from the Cassini spacecraft
Russell, C. T.; Dougherty, M. K.; Tsurutani, B. T. +8 more
The Cassini spacecraft commenced its tour of the planet Saturn on 1 July 2004 (GMT). During the insertion orbit, the Cassini magnetometer (MAG), radio/plasma wave experiment (RPWS), and plasma spectrometer (CAPS) obtained in situ measurements of the magnetic field and plasma conditions associated with Saturn's environment. Analysis of the magnetic…
X-Ray-selected Intermediate-Redshift Groups of Galaxies
Mulchaey, John S.; Rosati, Piero; Lubin, Lori M. +2 more
We present spectroscopic confirmation of nine moderate-redshift galaxy groups and poor clusters selected from the ROSAT Deep Cluster Survey. The groups span the redshift range z~0.23-0.59 and have between 4 and 20 confirmed members. The velocity dispersions of these groups range from ~125 to 650 km s-1. Similar to X-ray groups at low re…
Origin of the turbulent spectra in the high-altitude cusp: Cluster spacecraft observations
Balogh, A.; Dandouras, I.; Lavraud, B. +6 more
High-resolution magnetic field data from Cluster Flux Gate Magnetometer (FGM) and the Spatio-Temporal Analysis of Field Fluctuations (STAFF) instruments are used to study turbulent magnetic field fluctuations during the high-altitude cusp crossing on 17 March 2001. Despite the quiet solar wind conditions, the cusp was filled with magnetic field tu…
Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys - II. The unique LMC cluster ESO 121-SC03
Mackey, A. D.; Gilmore, G. F.; Payne, M. J.
We present the results of photometric measurements from images of the Large Magellanic Cloud (LMC) cluster ESO 121-SC03 taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. Our resulting colour-magnitude diagram (CMD) reaches 3 mag below the main-sequence turn-off, and represents by far the deepest observation of this cl…
A Close Look at the Population of Supersoft and Quasi-soft X-Ray Sources Observed in M31 with XMM-Newton
Orio, Marina
The deepest X-ray images of M31, obtained with XMM-Newton, are examined to derive spectral and statistical properties of the population of the very soft X-ray sources. When classifying supersoft X-ray sources (SSSs) with criteria based on the same hardness ratios defined for recent Chandra observations, one-quarter of the selected SSSs turn out to…
Stellar archaeology: the evolving spectrum of FG Sagittae
Jeffery, C. S.; Schönberner, D.
Over an interval of 120 years, the extraordinary object
Multi-wavelength afterglow observations of the high redshift GRB 050730
McBreen, S.; Bremer, M.; Tanvir, N. +22 more
Context: .GRB 050730 is a long duration high-redshift burst (z=3.967) that was discovered by Swift. The afterglow shows variability and was well monitored over a wide wavelength range. We present comprehensive temporal and spectral analysis of the afterglow of GRB 050730 including observations covering the wavelength range from the millimeter to X…
Dust-scattered X-ray halos around gamma-ray bursts: GRB 031203 revisited and the new case of GRB 050713A
Tiengo, A.; Mereghetti, S.
Scattering by interstellar dust grains can produce time variable X-ray halos around gamma-ray bursts (GRB). In particular, an X-ray expanding ring is expected when a short pulse of X-ray radiation is scattered by a narrow layer of dust in our Galaxy. We present a new method for detecting and analyzing dust-scattering expanding rings around gamma-r…
A Catalog of Transient X-Ray Sources in M31
Williams, Benjamin F.; Garcia, Michael R.; Naik, S. +1 more
From 1999 October to 2002 August, 45 transient X-ray sources were detected in M31 by Chandra and XMM-Newton. We have performed spectral analysis of all XMM-Newton and Chandra ACIS detections of these sources, as well as flux measurements of Chandra HRC detections. The result is absorption-corrected X-ray light curves for these sources covering thi…
On the horizontal branch of the galactic globular cluster NGC 2808
Zoccali, M.; Bono, G.; Cassisi, S. +3 more
We present new UV (F218W) data for stars in the central region of the Galactic globular cluster NGC 2808, collected with the WFPC2 camera on board the Hubble Space Telescope. These data together with F439W and F555W-band data and previous ground-based observations provide a multifrequency coverage of the cluster stellar population extending up to …