Search Publications
Evidence for a co-moving sub-stellar companion of GQ Lup
Wuchterl, G.; Neuhäuser, R.; Guenther, E. W. +3 more
We present a companion of the ≤2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 140 ± 50 pc from imaging, astrometry, and spectroscopy. With direct K-band imaging using VLT/NACO, we detected an object 6 mag fainter than GQ Lup located 0.7'' west of it. Compared to images obtained 2 to 5 years earlier with Subaru/CIAO a…
A Full View of EIT Waves
Chen, P. F.; Shibata, K.; Fang, C.
Early observations by the EUV Imaging Telescope (EIT) on the Solar and Heliospheric Observatory indicated that propagating diffuse wave fronts, now conventionally referred to as ``EIT waves,'' can often be seen on the solar disk with a propagation velocity several times smaller than that of Hα Moreton waves. They are almost always associated with …
Spatial Correlation of Solar-Wind Turbulence from Two-Point Measurements
Dasso, S.; Matthaeus, W. H.; Smith, C. W. +3 more
Interplanetary turbulence, the best studied case of low frequency plasma turbulence, is the only directly quantified instance of astrophysical turbulence. Here, magnetic field correlation analysis, using for the first time only proper two-point, single time measurements, provides a key step in unraveling the space-time structure of interplanetary …
Galactic Globular Cluster Relative Ages
Salaris, Maurizio; Recio-Blanco, Alejandra; Piotto, Giampaolo +5 more
We present accurate relative ages for a sample of 55 Galactic globular clusters. The ages have been obtained by measuring the difference between the horizontal branch and the turnoff in two internally photometrically homogeneous databases. The mutual consistency of the two data sets has been assessed by comparing the ages of 16 globular clusters i…
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…