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ISM properties in low-metallicity environments. III. The spectral energy distributions of II Zw 40, He 2-10 and NGC 1140
Bernard, J. -P.; Madden, S. C.; Galliano, F. +2 more
We present new 450 and 850 µm SCUBA data and 1.3 mm MAMBO data of the dwarf galaxies II Zw 40, He 2-10 and NGC 1140. Additional ISOCAM, IRAS as well as ground based data are used to construct the observed mid-infrared to millimeter spectral energy distribution of these galaxies. These spectral energy distributions are modeled in a self-consi…
The initial conditions of isolated star formation - VI. SCUBA mappingof pre-stellar cores
Ward-Thompson, D.; André, P.; Kirk, J. M.
Observations have been carried out with the Submillimetre Common-User Bolometer Array (SCUBA) at the James Clerk Maxwell Telescope (JCMT) of regions of comparatively isolated star formation in molecular cloud cores. Some 52 starless cores were observed, which are molecular cloud cores that do not contain any sign of protostellar activity such as i…
Herbig Ae/Be Stars in nearby OB Associations
Berlind, Perry; Hartmann, Lee; Calvet, Nuria +3 more
We have carried out a study of the early-type stars in nearby OB associations spanning an age range of ~3-16 Myr, with the aim of determining the fraction of stars that belong to the Herbig Ae/Be class. We studied the B, A, and F stars in the nearby (<=500 pc) OB associations Upper Scorpius, Perseus OB2, Lacerta OB1, and Orion OB1, with members…
Tidal dissipation within large icy satellites: Applications to Europa and Titan
Sotin, C.; Tobie, G.; Mocquet, A.
This paper describes a new approach based on variational principles to calculate the radial distribution of tidal energy dissipation in any satellite. The advantage of the model with respect to classical solutions, is that it relates in a straightforward way the radial distribution of the time-averaged dissipation rate to its sensitivity to the co…
The star cluster population of M 51. II. Age distribution and relations among the derived parameters
Bastian, N.; Gieles, M.; de Grijs, R. +2 more
We use archival Hubble Space Telescope observations of broad-band images from the ultraviolet (F255W-filter) through the near infrared (NICMOS F160W-filter) to study the star cluster population of the interacting spiral galaxy M 51. We obtain age, mass, extinction, and effective radius estimates for 1152 star clusters in a region of ~7.3 × 8.1 kpc…
AGN Host Galaxies at z~0.4-1.3: Bulge-dominated and Lacking Merger-AGN Connection
Jogee, S.; Hornschemeier, A. E.; Alexander, D. M. +13 more
We investigate morphological structure parameters and local environments of distant moderate-luminosity active galactic nucleus (AGN) host galaxies in the overlap between the HST/ACS observations of the Great Observatories Origins Deep Survey (GOODS) and the two Chandra Deep Fields. We compute near-neighbor counts and BViz asymmetry (A) and concen…
Eruption of a Kink-unstable Filament in NOAA Active Region 10696
van Driel-Gesztelyi, Lidia; Démoulin, Pascal; Török, Tibor +2 more
We present rapid-cadence Transition Region and Coronal Explorer (TRACE) observations that show evidence of a filament eruption from NOAA active region 10696, accompanied by an X2.5 flare, on 2004 November 10. The eruptive filament, which manifests as a fast coronal mass ejection some minutes later, rises as a kinking structure with an apparently e…
Cassini Magnetometer Observations During Saturn Orbit Insertion
Russell, C. T.; Dougherty, M. K.; Balogh, A. +15 more
Cassini's successful orbit insertion has provided the first examination of Saturn's magnetosphere in 23 years, revealing a dynamic plasma and magnetic environment on short and long time scales. There has been no noticeable change in the internal magnetic field, either in its strength or its near-alignment with the rotation axis. However, the exter…
An Overabundance of Transient X-Ray Binaries within 1 Parsec of the Galactic Center
Brandt, W. N.; Muno, M. P.; Baganoff, F. K. +4 more
During 5 years of Chandra observations, we have identified seven X-ray transients located within 23 pc of Sgr A*. These sources each vary in luminosity by more than a factor of 10 and have peak X-ray luminosities greater than 5×1033 ergs s-1, which strongly suggests that they are accreting black holes or neutron stars. The pe…
The mass of the missing baryons in the X-ray forest of the warm-hot intergalactic medium
Elvis, Martin; Zezas, Andreas; Marshall, Herman +7 more
Recent cosmological measurements indicate that baryons comprise about four per cent of the total mass-energy density of the Universe, which is in accord with the predictions arising from studies of the production of the lightest elements. It is also in agreement with the actual number of baryons detected at early times (redshifts z > 2). Close …