Search Publications
Optically faint X-ray sources in the Chandra deep field North: Spitzer constraints
Georgantopoulos, I.; Rovilos, E.; Fotopoulou, S. +1 more
We investigate the properties of the most optically faint sources in the GOODS-N area (RAB > 26.5). These extremely optically faint populations present an uncharted territory although they represent an appreciable fraction of the X-ray sources in the GOODS-N field. The optically faint sources are believed to contain either red active…
Imaging Carbon Monoxide Emission in the Starburst Galaxy NGC 6000
Wilner, David J.; Martín, Sergio; Espada, Daniel +1 more
We present measurements of carbon monoxide emission in the central region of the nearby starburst NGC 6000 taken with the Submillimeter Array. The J = 2-1 transition of 12CO, 13CO, and C18O were imaged at a resolution of ~3'' × 2'' (450 × 300 pc). We accurately determine the dynamical center of NGC 6000 at αJ2…
X-ray emission characteristics of two Wolf-Rayet binaries: V444 Cyg and CD Cru
Pandey, J. C.; Singh, K. P.; Kumar, Brijesh +2 more
Using data from observations made with XMM-Newton, we present an X-ray analysis of two Wolf-Rayet (WR) binaries: V444 Cyg and CD Cru. The X-ray light curves show the phase-locked variability in both binaries, where the flux increased by a factor of ~2 for V444 Cyg and ~1.5 for CD Cru, from minimum to maximum. The maximum luminosities in the 0.3-7.…
A new eclipsing binary system with a pulsating component detected by CoRoT
Ribas, I.; Balaguer-Núñez, L.; Hareter, M. +3 more
We report the discovery of CoRoT 102980178 (α = 06h 50m12.10s , δ = -02°41' 21.8'', J2000) an Algol-type eclipsing binary system with a pulsating component (oEA). It was identified using a publicly available 55 day long monochromatic lightcurve from the CoRoT initial run dataset (exoplanet field). Eleven consecutive 1.26m deep total primary and th…
Overlapping ionospheric and surface echoes observed by the Mars Express radar sounder near the Martian terminator
Gurnett, D. A.; Morgan, D. D.; Duru, F.
Radar soundings from the Mars Express spacecraft occasionally show ionospheric and surface echoes that overlap in frequency. For specular reflection from a horizontally stratified ionosphere such a frequency overlap is not possible, since ionospheric and surface reflections can only occur at frequencies below and above the maximum ionospheric plas…
Infrared studies of molecular shocks in the supernova remnant HB 21: II. Thermal admixture of shocked H2 gas in the south
Koo, Bon-Chul; Lee, Ho-Gyu; Moon, Dae-Sik +2 more
We present near- and mid-infrared observations on the shock-cloud interaction region in the southern part of the supernova remnant HB 21, performed with the InfraRed Camera (IRC) aboard AKARI satellite and the Wide InfraRed Camera (WIRC) at the Palomar 5 m telescope. The IRC 4 µm (N4), 7 µm (S7), and 11 µm (S11) band images and t…
The SUMER Ly-α line profile in quiescent prominences
Curdt, W.; Teriaca, L.; Tian, H. +1 more
Aims: As the result of a novel observing technique, we publish for the first time SoHO-SUMER observations of the true spectral line profile of hydrogen Lyman-α in quiescent prominences. Because SoHO is not in Earth orbit, our high-quality data set is free of geocoronal absorption. We studied the line profile to complement earlier observations…
Global plasma-parameter simulation of Comet 67P/Churyumov-Gerasimenko approaching the Sun
Glassmeier, K. -H.; Kührt, E.; Motschmann, U. +4 more
We simulate the evolution of the plasma environment of comet 67P/Churyumov-Gerasimenko (CG), which is the target comet of the European Space Agency's (ESA) Rosetta mission, as the comet approaches the Sun. The plasma environment is calculated in three dimensions with a hybrid plasma model. The model treats the dynamics of the solar wind protons an…
Spatially Resolved Spectroscopy of Starburst and Post-Starburst Galaxies in the Rich z~0.55 Cluster CL 0016+16 1
Kuntschner, Harald; Couch, Warrick J.; Pracy, Michael B.
We have used the Low Resolution Imaging Spectrograph on the W. M. Keck I telescope to obtain spatially resolved spectroscopy of a small sample of six `post-starburst' and three `dusty-starburst' galaxies in the rich cluster CL 0016+16 at z=0.55. We use this to measure radial profiles of the Hδ and [OII]λ3727 lines which are diagnostic probes of th…
Nearby Spiral Galaxy Globular Cluster Systems. II. Globular Cluster Metallicities in NGC 300
Nantais, Julie B.; Huchra, John P.; Barmby, Pauline +1 more
We present new metallicity estimates for globular cluster (GC) candidates in the Sd spiral NGC 300, one of the nearest spiral galaxies outside the Local Group. We have obtained optical spectroscopy for 44 Sculptor Group GC candidates with the Boller and Chivens (B&C) spectrograph on the Baade Telescope at Las Campanas Observatory. There are tw…