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The Second IBIS/ISGRI Soft Gamma-Ray Survey Catalog
Hill, A. B.; Mas-Hesse, J. M.; Walter, R. +21 more
In this paper we report the second soft gamma-ray source catalog obtained with the IBIS/ISGRI gamma-ray imager on board the INTEGRAL satellite. The scientific data set is based on more than 10 Ms of high-quality observations performed during the first 2 years of Core Program and public IBIS/ISGRI observations, and covers ~50% of the whole sky. The…
The luminosity function of young star clusters: implications for the maximum mass and luminosity of clusters
Bastian, N.; Larsen, S. S.; Gieles, M. +1 more
We introduce a method to relate a possible truncation of the star cluster mass function at the high mass end to the shape of the cluster luminosity function (LF). We compare the observed LFs of five galaxies containing young star clusters with synthetic cluster population models with varying initial conditions. The LF of the SMC, the LMC and NGC 5…
Scaling Mass Profiles around Elliptical Galaxies Observed with Chandra and XMM-Newton
Fukazawa, Y.; Botoya-Nonesa, J. G.; Pu, J. +2 more
We investigated the dynamical structure of 53 elliptical galaxies using the Chandra archival X-ray data. In X-ray-luminous galaxies, temperature increases with radius and gas density is systematically higher at the optical outskirts, indicating the presence of a significant amount of the group-scale hot gas. In contrast, X-ray-dim galaxies show a …
Kinetic simulations of ring current evolution during the Geospace Environment Modeling challenge events
Thomsen, M. F.; Mouikis, C. G.; Jordanova, V. K. +5 more
We investigate the temporal and spatial evolution of the ring current during two storms selected for study by the Geospace Environment Modeling (GEM) program using our kinetic drift-loss model coupled with a time-dependent plasmasphere model. We use geosynchronous data from LANL satellites to model the inflow of plasma from the magnetotail. We com…
X-ray sources and magnetic reconnection in the X3.9 flare of 2003 November 3
Magdalenić, J.; Temmer, M.; Veronig, A. M. +5 more
Context: .Recent RHESSI observations indicate an apparent altitude decrease of flare X-ray loop-top (LT) sources before changing to the commonly observed upward growth of the flare loop system.
Aims: .We performed a detailed study of the LT altitude decrease for one well observed flare in order to find further hints on the physics of this phen…
Identification of the Red Supergiant Progenitor of Supernova 2005cs: Do the Progenitors of Type II-P Supernovae Have Low Mass?
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Livio, Mario +5 more
The stars that end their lives as supernovae (SNe) have been directly observed in only a handful of cases, mainly because of the extreme difficulty of identifying them in images obtained prior to the SN explosions. Here we report the identification of the progenitor for the recent Type II-plateau (core collapse) SN 2005cs in pre-explosion archival…
XMM-Newton study of the complex and variable spectrum of NGC 4051
Maraschi, L.; Cappi, M.; Ponti, G. +3 more
We study the X-ray spectral variability of the narrow line Seyfert 1 galaxy NGC 4051 as observed during two XMM-Newton observations. To gain insight on the general behaviour, we first apply model-independent techniques such as rms spectra and flux-flux plots. We then perform time-resolved spectral analysis by splitting the observations into 68 spe…
Reduced Wolf-Rayet line luminosities at low metallicity
Crowther, P. A.; Hadfield, L. J.
New NTT/EMMI spectrophotometry of single WN2-5 stars in the Small and Large Magellanic Clouds are presented, from which He ii λ4686 line luminosities have been derived, and compared with observations of other Magellanic Cloud Wolf-Rayet stars. SMC WN3-4 stars possess line luminosities which are a factor of 4 times lower than LMC counterparts, inco…
Deep Extragalactic Surveys around the Ecliptic Poles with AKARI (ASTRO-F)
Nakagawa, Takao; Shirahata, Mai; Oyabu, Shinki +26 more
AKARI (formerly ASTRO-F) is an infrared space telescope designed for an all-sky survey at 10-180 µm, and deep pointed surveys of selected areas at 2-180 µm. The deep pointed surveys with AKARI will significantly advance our understanding of galaxy evolution, the structure formation of the universe, the nature of buried AGNs, and the co…
Surface Brightness Profiles of Galactic Globular Clusters from Hubble Space Telescope Images
Gebhardt, Karl; Noyola, Eva
The Hubble Space Telescope (HST) allows us to study the central surface brightness profiles of globular clusters at unprecedented detail. We have mined the HST archives to obtain 38 WFPC2 images of Galactic globular clusters with adequate exposure times and filters, which we use to measure their central structure. We outline a reliable method to o…