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Discovery of an aurora on Mars
Bertaux, Jean-Loup; Leblanc, François; Korablev, Oleg +5 more
In the high-latitude regions of Earth, aurorae are the often-spectacular visual manifestation of the interaction between electrically charged particles (electrons, protons or ions) with the neutral upper atmosphere, as they precipitate along magnetic field lines. More generally, auroral emissions in planetary atmospheres ``are those that result fr…
Cassini Measurements of Cold Plasma in the Ionosphere of Titan
Gurnett, D. A.; Persoon, A. M.; Dougherty, M. K. +15 more
The Cassini Radio and Plasma Wave Science (RPWS) Langmuir probe (LP) sensor observed the cold plasma environment around Titan during the first two flybys. The data show that conditions in Saturn's magnetosphere affect the structure and dynamics deep in the ionosphere of Titan. The maximum measured ionospheric electron number density reached 3800 p…
Imaging Redshifts of BL Lacertae Objects
Sbarufatti, B.; Falomo, R.; Treves, A.
The HST snapshot imaging survey of 110 BL Lac objects (Urry et al.) has clearly shown that the host galaxies are massive and luminous ellipticals. The dispersion of the absolute magnitudes is sufficiently small that the measurement of the galaxy brightness becomes a valuable way of estimating their distance. This is illustrated by constructing a H…
The DEEP Groth Strip Galaxy Redshift Survey. III. Redshift Catalog and Properties of Galaxies
Weiner, Benjamin J.; Forbes, Duncan A.; Rhodes, Jason +16 more
The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at understanding the properties and clustering of galaxies at redshifts z~1. We present the redshift catalog of the DEEP1 Groth Strip pilot phase of this project, a Keck LRIS survey of faint galaxies in the Groth Survey Strip imaged wi…
Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
Anderson, Jay; Salaris, Maurizio; Bedin, Luigi R. +5 more
We propose a zero-point photometric calibration of the data from the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on board the Hubble Space Telescope, based on a spectrum of Vega and the most up-to-date in-flight transmission curves of the camera. This calibration is accurate at the level of a few hundredths of a magnitude. The main …
Spectral Reflectance and Morphologic Correlations in Eastern Terra Meridiani, Mars
Mangold, N.; Bibring, J. -P.; Arvidson, R. E. +7 more
The Mars Express Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) hyperspectral image data covering eastern Terra Meridiani indicate the ubiquitous presence of molecular water in etched terrain materials that disconformably overlie heavily cratered terrains and underlie the hematite-bearing plains explored by the Opportun…
Spectroscopic Study on the Atmospheric Parameters of Nearby F--K Dwarfs and Subgiants
Sato, Bun'ei; Kambe, Eiji; Takeda, Yoichi +2 more
Based on a collection of high-dispersion spectra obtained at Okayama Astrophysical Observatory, the atmospheric parameters (Teff, log g, vt, and [Fe/H]) of 160 mid-F through early-K stars were extensively determined by the spectroscopic method using the equivalent widths of Fe I and Fe II lines along with the numerical techni…
Molecular gas in NUclei of GAlaxies (NUGA). IV. Gravitational torques and AGN feeding
Hunt, L. K.; Schinnerer, E.; Combes, F. +2 more
We discuss the efficiency of stellar gravity torques as a mechanism to account for the feeding of the central engines of four low luminosity Active Galactic Nuclei (AGN): NGC 4321 (HII nucleus/LINER), NGC 4826 (HII nucleus/LINER), NGC 4579 (LINER 1.9/Seyfert 1.9) and NGC 6951 (Seyfert 2). These galaxies have been observed as part of the NUclei of …
Properties of Lyα emitters around the radio galaxy MRC 0316 257,
Pentericci, L.; Röttgering, H. J. A.; Miley, G. K. +9 more
Observations of the radio galaxy MRC 0316 257 at z = 3.13 and the surrounding field are presented. Using narrow- and broad-band imaging obtained with the VLT, 77 candidate Lyα emitters with a rest-frame equivalent width of >15 Å were selected in a ∼ 7´ × 7´ field around the radio galaxy. Spectroscopy of 40 candidate emitters resulted in the dis…
The Murmur of the Sleeping Black Hole: Detection of Nuclear Ultraviolet Variability in LINER Galaxies
Maoz, Dan; Nagar, Neil M.; Wilson, Andrew S. +1 more
LINER nuclei, which are present in many nearby galactic bulges, may be the manifestation of low-rate or low-radiative-efficiency accretion onto supermassive central black holes. However, it has been unclear whether the compact UV nuclear sources present in many LINERs are clusters of massive stars, rather than being directly related to the accreti…