Search Publications
Optical Identification of Infrared Space Observatory Far-Infrared Sources in the Lockman Hole Using a Deep Very Large Array 1.4 GHz Continuum Survey
Veilleux, S.; Sanders, D. B.; Kawara, K. +10 more
By exploiting the far-infrared (FIR) and radio correlation, we have performed a likelihood-ratio analysis to identify optical counterparts to the FIR sources that have been found in an area of ~0.9 deg2 during the Infrared Space Observatory (ISO) deep FIR survey in the Lockman Hole. New ground-based observations have been conducted to b…
The dark halo of the main lens galaxy in QSO 0957 + 561
Gil-Merino, R.; Goicoechea, L. J.; Ullán, A.
We present an analysis of infrared/optical/ultraviolet spectra of the two images of the first gravitationally lensed quasar Q0957 + 561A,B. The Hubble Space Telescope observations of Q0957 + 561A and Q0957 + 561B are separated in time by the known time delay in this system, so we can directly deduce the flux ratios. These flux ratios of images lea…
Extragalactic Source Counts in the Spitzer 24 Micron Band: What Do We Expect from ISOCAM 15 Micron Data and Models?
Pozzi, F.; Rodighiero, G.; Gruppioni, C. +2 more
The comparison between the new Spitzer data at 24 µm and the previous ISOCAM data at 15 µm is a key tool to understand galaxy properties and evolution in the infrared and to interpret the observed number counts, since the combination of Spitzer with the Infrared Space Observatory cosmological surveys provides for the first time the dir…
High spectral and temporal resolution observations of Saturn kilometric radiation
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +7 more
This paper presents the first high-resolution dynamic spectra of Saturn kilometric radiation acquired upon Cassini's approach and first orbits of Saturn. The emissions display upward and downward drifting features with bandwidths down to ~200 Hz and drift rates of a few kHz per second. At other times, the emissions are much more diffuse or continu…
Probing Halos of Galaxies at Very Large Radii Using Background QSOs
Freeman, K. C.; Wyse, R. F. G.; Broadhurst, T. +2 more
Gaseous halos of nine nearby galaxies (with redshifts cz<6000 km s-1) were probed at large galactocentric radii using background quasars observed with the Hubble Space Telescope Goddard High Resolution Spectrograph and the Space Telescope Imaging Spectrograph. The projected quasar-galaxy separations range from 55 to 387 h-1
The Initial Mass Function toward the Low-Mass End in the Large Magellanic Cloud with Hubble Space Telescope WFPC2 Observations
Henning, Th.; Brandner, W.; Gouliermis, D.
We present V- and I-equivalent Hubble Space Telescope (HST) WFPC2 photometry of two areas in the Large Magellanic Cloud: the southern part of the stellar association LH 52, located on the western edge of the supershell LMC 4, and a field between two associations, which is located on the southwestern edge of the shell and accounts for the general b…
The advanced Moon micro-imager experiment (AMIE) on SMART-1: Scientific goals and expected results
Langevin, Y.; Koschny, D.; Barucci, M. A. +16 more
The advanced Moon micro-imager experiment (AMIE) is the imaging system on board ESA mission to the Moon SMART-1; it makes use of a miniaturised detector and micro-processor electronics developed by SPACE X in the frame of the ESA technical programme. The AMIE micro-imager will provide high resolution CCD images of selected lunar areas and it will …
Modeling the Shock Aftermath Source of Energetic Particles in the Solar Corona
Vainio, Rami; Kocharov, Leon; Torsti, Jarmo +2 more
Recent observations on board the Solar and Heliospheric Observatory (SOHO) indicate that acceleration of solar energetic particles (SEPs) at intermediate scales in the solar corona, between flare acceleration and interplanetary CME-driven shock acceleration, significantly contributes to the production of >10 MeV protons. Coronal shocks seem to …
The Discovery of Extended Thermal X-Ray Emission from PKS 2152-699: Evidence for a ``Jet-Cloud'' Interaction
Bechtold, Jill; Ly, Chun; De Young, David S.
A Chandra ACIS-S observation of PKS 2152-699 reveals thermal emission from a diffuse region around the core and a hotspot located 10" northeast from the core. This is the first detection of thermal X-ray radiation on kiloparsec scales from an extragalactic radio source. Two other hotspots located 47" north-northeast and 26" southwest from the core…
X-Rays from Hybrid Stars
Ayres, Thomas R.
The late-type giants and supergiants of the ``hybrid chromosphere'' class display signatures of cool (T<~2×104 K) winds together with hot emission lines from species like C IV (T~105 K). A survey of such stars by Reimers et al. using ROSAT reported numerous X-ray detections (T~106 K), strengthening the (then her…