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An XMM-Newton view of the young open cluster NGC 6231. I. The catalogue
Gosset, E.; Rauw, G.; Vreux, J. -M. +2 more
This paper is the first of a series dedicated to the X-ray properties of the young open cluster NGC 6231. Our data set relies on an XMM-Newton campaign of a nominal duration of 180 ks and reveals that NGC 6231 is very rich in the X-ray domain too. Indeed, 610 X-ray sources are detected in the present field of view, centered on the cluster core. Th…
Cluster survey of the mid-altitude cusp: 1. size, location, and dynamics
Escoubet, C. P.; Pitout, F.; Klecker, B. +1 more
We present a statistical study of four years of Cluster crossings of the mid-altitude cusp. In this first part of the study, we start by introducing the method we have used a) to define the cusp properties, b) to sort the interplanetary magnetic field (IMF) conditions or behaviors into classes, c) to determine the proper time delay between the sol…
The DEEP Groth Strip Survey. VI. Spectroscopic, Variability, and X-Ray Detection of Active Galactic Nuclei
Kobulnicky, Henry A.; Gebhardt, Karl; Willmer, Christopher N. A. +8 more
We identify active galactic nuclei (AGNs) in the Groth-Westphal Survey Strip (GSS) using the independent and complementary selection techniques of optical spectroscopy and photometric variability. We discuss the X-ray properties of these AGNs using Chandra/XMM-Newton data for this region. From a sample of 576 galaxies with high-quality spectra we …
Saturn's auroral morphology and activity during quiet magnetospheric conditions
Coates, A. J.; Dougherty, M. K.; Kurth, W. S. +8 more
We report the results of a coordinated Hubble Space Telescope-Cassini campaign that took place between 26 October and 2 November 2005. During this period, Saturn's magnetosphere was in an expanded state and the solar wind was quiet, as indicated by the location of the magnetopause, in situ particle measurements, weak auroral SKR emission, and the …
Analysis and Interpretation of Hard X-Ray Emission from the Bullet Cluster (1ES 0657-558), the Most Distant Cluster of Galaxies Observed by RXTE
Madejski, Greg; Petrosian, Vahé; Luli, Kevin
Evidence for nonthermal activity in clusters of galaxies is well established from radio observations of synchrotron emission by relativistic electrons. New windows in the extreme-ultraviolet and hard X-ray ranges have provided more powerful tools for the investigation of this phenomenon. Detections of hard X-rays in the 20-100 keV range have been …
A Spitzer IRAC Search for Substellar Companions of the Debris Disk Star ɛ Eridani
Stapelfeldt, K. R.; Fazio, G. G.; Marengo, M. +3 more
We have used the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope to search for low-mass companions of the nearby debris disk star ɛ Eri. The star was observed in two epochs 39 days apart, with different focal plane rotation to allow the subtraction of the instrumental point-spread function, achieving a maximum sensitivity of 0.01…
Structural parameters from ground-based observations of newly discovered globular clusters in NGC 5128
Geisler, D.; Gómez, M.; Richtler, T. +3 more
We have investigated a number of globular cluster candidates from a recent wide-field study by Harris et al. (2004a, AJ, 128, 712) of the giant elliptical galaxy
Analysis of plasmaspheric plumes: CLUSTER and IMAGE observations
Sandel, B. R.; Dandouras, I.; André, M. +13 more
Plasmaspheric plumes have been routinely observed by CLUSTER and IMAGE. The CLUSTER mission provides high time resolution four-point measurements of the plasmasphere near perigee. Total electron density profiles have been derived from the electron plasma frequency identified by the WHISPER sounder supplemented, in-between soundings, by relative va…
Dark and Baryonic Matter in Bright Spiral Galaxies. I. Near-Infrared and Optical Broadband Surface Photometry of 30 Galaxies
de Jong, Roelof S.; Pogge, Richard W.; Kassin, Susan A.
We present photometrically calibrated images and surface photometry in the B, V, R, J, H, and K bands of 25, and in the g, r, and K bands of five nearby bright (B0T<12.5 mag) spiral galaxies with inclinations of 30°-65° spanning the Hubble sequence from Sa to Scd. Data are from The Ohio State University Bright Spiral Galax…
The Araucaria Project: The Distance to NGC 300 from the Red Giant Branch Tip Using HST ACS Imaging
Bresolin, Fabio; Kudritzki, Rolf-Peter; Gieren, Wolfgang +2 more
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to obtain deep photometry of the NGC 300 spiral galaxy in the Sculptor group. The results have been used to derive an accurate distance determination based on the tip of the red giant branch distance estimator. Both edge-detection and maximum likelihood methods have b…