Search Publications
Advanced Camera for Surveys Imaging of 25 Galaxies in Nearby Groups and in the Field
Dolphin, Andrew; Shaya, Edward J.; Tully, R. Brent +6 more
We present Hubble Space Telescope Advanced Camera for Surveys images and color-magnitude diagrams for 25 nearby galaxies with radial velocities VLG<500 km s-1. Distances are determined based on the luminosities of stars at the tip of the red giant branch that range from 2 to 12 Mpc. Two of the galaxies, NGC 4163 and IC 466…
Methane drizzle on Titan
Neubauer, Fritz M.; McKay, Christopher P.; Tokano, Tetsuya +4 more
Saturn's moon Titan shows landscapes with fluvial features suggestive of hydrology based on liquid methane. Recent efforts in understanding Titan's methane hydrological cycle have focused on occasional cloud outbursts near the south pole or cloud streaks at southern mid-latitudes and the mechanisms of their formation. It is not known, however, if …
Dynamical Properties of Ultraluminous Infrared Galaxies. II. Traces of Dynamical Evolution and End Products of Local Ultraluminous Mergers
Lutz, D.; Genzel, R.; Sturm, E. +8 more
We present results from our Very Large Telescope large program to study the dynamical evolution of local ultraluminous infrared galaxies (ULIRGs) and QSOs. This paper is the second in a series presenting the stellar kinematics of 54 ULIRGs, derived from high-resolution, long-slit H- and K-band spectroscopy. The data presented here, including obser…
Kinematics of the Narrow-Line Region in the Seyfert 2 Galaxy NGC 1068: Dynamical Effects of the Radio Jet
Kraemer, S. B.; Crenshaw, D. M.; Das, V. +1 more
We present a study of high-resolution long-slit spectra of the narrow-line region (NLR) in NGC 1068 obtained with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope (HST). The spectra were retrieved from the Multimission Archive at the Space Telescope Science Institute obtained from two visits and seven orbits of HST time. …
A VLT/NACO survey for triple and quadruple systems among visual pre-main sequence binaries
Correia, S.; Zinnecker, H.; Ratzka, Th. +1 more
Aims.This paper describes a systematic search for high-order multiplicity among wide visual Pre-Main Sequence (PMS) binaries.
Methods: .We conducted an Adaptive Optics survey of a sample of 58 PMS wide binaries from various star-forming regions, which include 52 T Tauri systems with mostly K- and M-type primaries, with the NIR instrument NACO…
Orientation and distribution of recent gullies in the southern hemisphere of Mars: Observations from High Resolution Stereo Camera/Mars Express (HRSC/MEX) and Mars Orbiter Camera/Mars Global Surveyor (MOC/MGS) data
Mangold, Nicolas; Neukum, Gerhard; Balme, Matthew +5 more
Geologically recent small gullies on Mars display morphologies consistent with erosion by water or by debris flows. Suggested formation models are divided into two main categories: (1) groundwater or (2) melting of near-surface ice/snow sourced from the atmosphere. We have measured location and orientation and recorded the local contexts of gullie…
Nature and origin of the hematite-bearing plains of Terra Meridiani based on analyses of orbital and Mars Exploration rover data sets
Bibring, J. -P.; Arvidson, R. E.; Gondet, B. +23 more
The ~5 km of traverses and observations completed by the Opportunity rover from Endurance crater to the Fruitbasket outcrop show that the Meridiani plains consist of sulfate-rich sedimentary rocks that are largely covered by poorly-sorted basaltic aeolian sands and a lag of granule-sized hematitic concretions. Orbital reflectance spectra obtained …
Restrictions on parameters of sterile neutrino dark matter from observations of galaxy clusters
Neronov, A.; Boyarsky, A.; Ruchayskiy, O. +1 more
We find restrictions on the mass and mixing angle of the dark matter sterile neutrinos using x-ray observations of Coma and Virgo galaxy clusters with XMM-Newton satellite. In the absence of clearly detectable line, we present detailed analysis of various methods of putting restrictions on mass and mixing angle of sterile neutrino. Our analysis pr…
The Galaxy Environment of O VI Absorption Systems
Shull, J. Michael; Danforth, Charles W.; Stocke, John T. +3 more
We combine a FUSE sample of O VI absorbers (z<0.15) with a database of 1.07 million galaxy redshifts to explore the relationship between absorbers and galaxy environments. All 37 absorbers with NOVI>=1013.2 cm-2 lie within 800 h-170 kpc of the nearest galaxy, with no compelling evidence …
The Dynamical Mass-to-Light Ratio Profile and Distance of the Globular Cluster M15
Gebhardt, Karl; van de Ven, Glenn; van den Bosch, Remco +2 more
We construct orbit-based axisymmetric dynamical models for the globular cluster M15 that fit ground-based line-of-sight velocities and Hubble Space Telescope line-of-sight velocities and proper motions. This allows us to constrain the variation of the mass-to-light ratio M/L as a function of radius in the cluster and to measure the distance and in…