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First-look XMM-Newton EPIC observations of the prototypical starburst galaxy M82
Stevens, Ian R.; Bravo-Guerrero, Jimena; Read, Andrew M.
We present initial XMM-Newton EPIC observations of the prototypical starburst galaxy M82. The superwind is seen to extend continuously from the starburst region to the X-ray emission associated with the Hα`cap'. We also find evidence for a ridge feature, probably associated with the superwind interacting with an HI streamer. Narrow-band images, ce…
Fe K emission and absorption features in XMM-Newton spectra of Markarian 766: evidence for reprocessing in flare ejecta
O'Brien, P. T.; Reeves, J. N.; Page, K. L. +2 more
We report on the analysis of a long XMM-Newton European Photon Imaging Camera (EPIC) observation in 2001 May of the narrow-line Seyfert 1 galaxy Markarian 766 (Mrk 766). The 3-11 keV spectrum exhibits a moderately steep power-law continuum, with a broad emission line at ~6.7 keV, probably blended with a narrow line at ~6.4 keV, and a broad absorpt…
Long period variables detected by ISO in the Small Magellanic Cloud
Blommaert, J. A. D. L.; Omont, A.; van Loon, J. Th. +8 more
This article presents the study of the light-curves extracted from the MACHO database of a sample of stars observed by the Infrared Space Observatory in the Small Magellanic Cloud. These stars belong to the ISO-Mini-Survey catalogue of the Magellanic Clouds (ISO-MCMS, Loup et al. {in preparation}). Most of them are in the asymptotic giant branch (…
A Transient Heating Model for Coronal Structure and Dynamics
Klimchuk, J. A.; Lanzafame, A. C.; Lanza, A. F. +4 more
A wealth of observational evidence for flows and intensity variations in nonflaring coronal loops leads to the conclusion that coronal heating is intrinsically unsteady and concentrated near the chromosphere. We have investigated the hydrodynamic behavior of coronal loops undergoing transient heating with one-dimensional numerical simulations in w…
A tilted-dipole MHD model of the solar corona and solar wind
Goldstein, M. L.; Usmanov, A. V.
We simulate the three-dimensional structure of the heliosphere during solar activity minimum by specifying boundary conditions at the coronal base. We compare the output of the model with Ulysses observations obtained during the spacecraft's first fast latitude transition in 1994-1995. The polytropic MHD equations are solved for a steady coronal o…
Is There Really a Black Hole at the Center of NGC 4041? Constraints from Gas Kinematics
Marconi, A.; Capetti, A.; Carollo, C. M. +16 more
We present Space Telescope Imaging Spectrograph spectra of the Sbc spiral galaxy NGC 4041, which were used to map the velocity field of the gas in its nuclear region. We detect the presence of a compact (r~=0.4"~=40 pc), high surface brightness, rotating nuclear disk cospatial with a nuclear star cluster. The disk is characterized by a rotation cu…
Proper motions and velocity asymmetries in the RW Aur jet
Dougados, C.; Cabrit, S.; López-Martín, L.
We present adaptive optics spectro-imaging observations of the RW Aur jet in optical forbidden lines, at an angular resolution of 0.4''. Comparison with HST data taken 2 years later shows that proper motions in the blueshifted and redshifted lobes are in the same ratio as their radial velocities, a direct proof that the velocity asymmetry in this …
The detection of stellar velocity dispersion drops in the central regions of five isolated Seyfert spirals
Roth, M.; Durret, F.; González Delgado, R. M. +5 more
We analyze the kinematics of the central regions of five isolated Seyfert spiral galaxies from the DEGAS sample (four with new data presented in this paper, IC 184, UGC 3223, NGC 2639, NGC 6814, and NGC 6951 from our previous data), by using long slit spectroscopy in the CaII triplet range (at ~8600 Å) obtained with a 4 m-class telescope. A drop o…
The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun
Makarov, Valeri V.
Based on the Hipparcos and Tycho-2 astrometric catalogs and the ROSAT surveys, a sample of 100 stars most luminous in X-rays within or around a distance of 50 pc is culled. The smallest X-ray luminosity in the sample, in units of 1029 ergs s-1, is LX=9.8 the strongest source in the solar neighborhood is II Peg, a R…
IBIS/PICsIT in-flight performances
Foschini, L.; Di Cocco, G.; Malaguti, G. +11 more
PICsIT (Pixellated Imaging CaeSium Iodide Telescope) is the high energy detector of the IBIS telescope on-board the INTEGRAL satellite. PICsIT operates in the gamma-ray energy range between 175 keV and 10 MeV, with a typical energy resolution of 10% at 1 MeV, and an angular resolution of 12 arcmin within a ~ 100 square degree field of view, with t…