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Magnetopause and Boundary Layer
Lundin, R.; Vaivads, A.; Owen, C. J. +6 more
The Far-Infrared Emission Line and Continuum Spectrum of the Seyfert Galaxy NGC 1068
Smith, Howard A.; González-Alfonso, Eduardo; Spinoglio, Luigi +2 more
We report on the analysis of the first complete far-infrared spectrum (43-197 µm) of the Seyfert 2 galaxy NGC 1068 as observed with the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). In addition to the seven expected ionic fine-structure emission lines, the OH rotational lines at 79, 119, and 163 µm w…
High heat flux on ancient Mars: Evidence from rift flank uplift at Coracis Fossae
Neukum, G.; Hauber, E.; Grott, M. +2 more
We have identified flexural uplift at the flanks of the Coracis Fossae Rift valley. Modeling the topography the elastic thickness is constrained to 10.3-12.5 km, the corresponding mechanical thickness and thermal gradient are 15-19 km and 27-33 K km-1, respectively. The time of rifting is dated by evaluating the crater size-frequency di…
A Photometric Redshift Galaxy Catalog from the Red-Sequence Cluster Survey
Gladders, M. D.; Yee, H. K. C.; Hsieh, B. C. +1 more
The Red-Sequence Cluster Survey (RCS) provides a large and deep photometric catalog of galaxies in the z' and Rc bands for 90 deg2 of sky, and supplemental V and B data have been obtained for 33.6 deg2. We compile a photometric redshift catalog from these four-band data by utilizing the empirical quadrat…
INTEGRAL SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane
Hornstrup, A.; Parmar, A. N.; Güdel, M. +25 more
The center of our Galaxy is a known strong source of electron-positron 511 keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of the central radian of our Galaxy. One of the primary objectives of the INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched in …
The Hot Intergalactic Medium-Galaxy Connection: Two Strong O VI Absorbers in the Sight Line toward PG 1211+143
Shull, J. Michael; Stocke, John T.; Tumlinson, Jason +1 more
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) and Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of the QSO PG 1211+143 (zem=0.081) and a galaxy survey of the surrounding field. This sight line shows two strong intergalactic absorption systems at cz~=15,300 and 19,300 km s-1. This …
First Optical Images of Circumstellar Dust Surrounding the Debris Disk Candidate HD 32297
Kalas, Paul
Near-infrared imaging with the Hubble Space Telescope recently revealed a circumstellar dust disk around the A star HD 32297. Dust-scattered light is detected as far as 400 AU radius, and the linear morphology is consistent with a disk ~10° away from an edge-on orientation. Here we present the first optical images that show the dust-scattered ligh…
A bar signature and central disc in the gaseous and stellar velocity fields of NGC 5448
Emsellem, Eric; van de Ven, Glenn; Peletier, Reynier F. +4 more
We analyse Spectrographic Areal Unit for Research on Optical Nebulae (SAURON) kinematic maps of the inner kiloparsec of the early-type (Sa) barred spiral galaxy NGC 5448. The observed morphology and kinematics of the emission-line gas is patchy and perturbed, indicating clear departures from circular motion. The kinematics of the stars is more reg…
Non-LTE Model Atmosphere Analysis of the Large Magellanic Cloud Supersoft X-Ray Source CAL 83
Rasmussen, Andrew P.; Paerels, Frits; Hubeny, Ivan +3 more
We present a non-LTE (NLTE) model atmosphere analysis of Chandra High Resolution Camera (HRC-S) and Low Energy Transmission Grating (LETG) and XMM-Newton Reflection Grating Spectrometer (RGS) spectroscopy of the prototypical supersoft source CAL 83 in the Large Magellanic Cloud. Taken with a 16 month interval, the Chandra and XMM-Newton spectra ar…
Star Cluster Survival in Star Cluster Complexes under Extreme Residual Gas Expulsion
Kroupa, P.; Fellhauer, M.
After the stars of a new, embedded star cluster have formed, they blow the remaining gas out of the cluster. Especially winds of massive stars and definitely the onset of the first supernovae can remove the residual gas from a cluster. This leads to a very violent mass loss and leaves the cluster out of dynamical equilibrium. Standard models predi…