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A class of compact dwarf galaxies from disruptive processes in galaxy clusters
Ferguson, H. C.; Hilker, M.; Drinkwater, M. J. +5 more
Dwarf galaxies have attracted increased attention in recent years, because of their susceptibility to galaxy transformation processes within rich galaxy clusters. Direct evidence for these processes, however, has been difficult to obtain, with a small number of diffuse light trails and intra-cluster stars being the only signs of galaxy disruption.…
Titan's atmosphere from ISO mid-infrared spectroscopy
Lellouch, E.; Feuchtgruber, H.; Coustenis, Athena +5 more
We have analyzed Titan observations performed by the Infrared Space Observatory (ISO) in the range 7-30 µm. The spectra obtained by three of the instruments on board the mission (the short wavelength spectrometer, the photometer, and the camera) were combined to provide new and more precise thermal and compositional knowledge of Titan's stra…
Ultradeep Near-Infrared ISAAC Observations of the Hubble Deep Field South: Observations, Reduction, Multicolor Catalog, and Photometric Redshifts
van Dokkum, Pieter G.; Franx, Marijn; Labbé, Ivo +10 more
We present deep near-infrared (NIR) Js-, H-, and Ks-band ISAAC imaging of the Wide Field Planetary Camera 2 (WFPC2) field of the Hubble Deep Field South (HDF-S). The 2.5‧×2.5‧ high Galactic latitude field was observed with the Very Large Telescope under the best seeing conditions, with integration times amounting to 33.6 hr i…
Completion of a Survey and Detailed Study of Double-peaked Emission Lines in Radio-loud Active Galactic Nuclei
Eracleous, Michael; Halpern, Jules P.
We report the completion of a survey of radio-loud active galactic nuclei (AGNs) begun in an earlier paper with the main goal of finding and studying broad, double-peaked Balmer lines. We present Hα spectra of 13 more broad-lined objects, including three with double-peaked Hα profiles. The final sample includes 106 radio-loud AGNs. In our final ce…
Vertical distribution of Galactic disk stars. I. Kinematics and metallicity
Soubiran, C.; Siebert, A.; Bienaymé, O.
Nearly 400 Tycho-2 stars have been observed in a 720 square degree field in the direction of the North Galactic Pole with the high resolution echelle spectrograph ELODIE. Absolute magnitudes, effective temperatures, gravities and metallicities have been estimated, as well as distances and 3D velocities. Most of these stars are clump giants and spa…
A New Empirical Model for the Structural Analysis of Early-Type Galaxies, and A Critical Review of the Nuker Model
Graham, Alister W.; Trujillo, I.; Asensio Ramos, A. +1 more
The Nuker law was designed to match the inner few (~3-10) arcseconds of predominantly nearby (<~30 Mpc) early-type galaxy light profiles; it was never intended to describe an entire profile. The Sérsic model, on the other hand, was developed to fit the entire profile; however, because of the presence of partially depleted galaxy cores, the Sérs…
Multiplicity among solar-type stars. III. Statistical properties of the F7-K binaries with periods up to 10 years
Arenou, F.; Udry, S.; Mayor, M. +1 more
Two CORAVEL radial velocity surveys - one among stars in the solar neighbourhood, the other in the Pleiades and in Praesepe - are merged to derive the statistical properties of main-sequence binaries with spectral types F7 to K and with periods up to 10 years. A sample of 89 spectroscopic orbits was finally obtained. Among them, 52 relate to a fre…
Discovery of X-Ray Quasi-periodic Oscillations from an Ultraluminous X-Ray Source in M82: Evidence against Beaming
Mushotzky, Richard F.; Strohmayer, Tod E.
We report the discovery with the European Photon Imaging Camera CCDs on board XMM-Newton of a 54 mHz quasi-periodic oscillation (QPO) in the greater than 2 keV X-ray flux from an ultraluminous X-ray source (ULX) in the starburst galaxy M82. This is the first detection of a QPO in the X-ray flux from an extragalactic ULX and confirms that the sourc…
The three-dimensional solar wind around solar maximum
McComas, D. J.; Goldstein, B. E.; Schwadron, N. A. +3 more
Ulysses is now completing its second solar polar orbit, dropping back down in latitude as the Sun passes through its post-maximum phase of the solar cycle. A mid-sized circumpolar coronal hole that formed around solar maximum in the northern hemisphere has persisted and produced a highly inclined CIR, which was observed from ~70°N down to ~30°N. W…
Investigation of 131 Herbig Ae/Be Candidate Stars
Alencar, S. H. P.; Corradi, W. J. B.; Guimarães, M. M. +5 more
We present a new catalog of 108 Herbig Ae/Be candidate stars identified in the Pico dos Dias Survey, together with 19 previously known candidates and four objects selected from the IRAS Faint Source Catalog. These 131 stars were observed with low- and/or medium-resolution spectroscopy, and we complement these data with high-resolution spectra of 3…