Search Publications
The SAURON project - X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/σ, ɛ) diagram with integral-field stellar kinematics
Krajnović, Davor; Emsellem, Eric; van de Ven, Glenn +11 more
We analyse the orbital distribution of elliptical (E) and lenticular (S0) galaxies using SAURON integral-field stellar kinematics within about one effective (half-light) radius. We construct the anisotropy diagram, which relates the ratio of the ordered and random motion in a galaxy (V/σ) to its observed ellipticity (ɛ), for the 48 E/S0 galaxies f…
Star Formation in NGC 5194 (M51a). II. The Spatially Resolved Star Formation Law
Gordon, Karl D.; Bot, Caroline; Calzetti, Daniela +20 more
We have studied the relationship between the star formation rate (SFR), surface density, and gas surface density in the spiral galaxy M51a (NGC 5194), using multiwavelength data obtained as part of the Spitzer Infrared Nearby Galaxies Survey (SINGS). We introduce a new SFR index based on a linear combination of Hα emission-line and 24 µm con…
The Process of Tholin Formation in Titan’s Upper Atmosphere
Coates, A. J.; Young, D. T.; Waite, J. H. +4 more
Titan’s lower atmosphere has long been known to harbor organic aerosols (tholins) presumed to have been formed from simple molecules, such as methane and nitrogen (CH4 and N2). Up to now, it has been assumed that tholins were formed at altitudes of several hundred kilometers by processes as yet unobserved. Using measurements …
Strong size evolution of the most massive galaxies since z ∼ 2
Cooper, M. C.; Ellis, Richard S.; Trujillo, Ignacio +3 more
Using the combined capabilities of the large near-infrared Palomar/DEEP-2 survey, and the superb resolution of the Advanced Camera for Surveys HST camera, we explore the size evolution of 831 very massive galaxies (M⋆≥ 1011h-270 M⊙) since z~ 2. We split our sample according to their light conc…
Radio Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
Stawarz, Łukasz; Sikora, Marek; Lasota, Jean-Pierre
We investigate how the total radio luminosity of AGN-powered radio sources depends on their accretion luminosity and the central black hole mass. Our studies cover about 7 orders of magnitude in accretion luminosity (expressed in Eddington units, i.e., as Eddington ratios) and the full range of AGN black hole masses. We find that AGNs form two dis…
The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters without Previous Hubble Space Telescope Photometry
Anderson, Jay; Dotter, Aaron; Sarajedini, Ata +10 more
We present the first results of a large Advanced Camera for Surveys (ACS) survey of Galactic globular clusters. This Hubble Space Telescope (HST) Treasury project is designed to obtain photometry with S/N (signal-to-noise ratio) gtrsim10 for main-sequence stars with masses gtrsim0.2 Modot in a sample of globulars using the ACS Wide Fiel…
COSMOS: Hubble Space Telescope Observations
Kneib, J. -P.; Aussel, H.; Daddi, E. +52 more
The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high-resolution imaging. Here we review the characteristics of the HST imaging with the Advanced Camera for Surveys (ACS) and parallel observations with NICMOS and WFPC2. A square field (1.8 deg
The lakes of Titan
Lorenz, R. D.; Stiles, B.; Kelleher, K. +35 more
The surface of Saturn's haze-shrouded moon Titan has long been proposed to have oceans or lakes, on the basis of the stability of liquid methane at the surface. Initial visible and radar imaging failed to find any evidence of an ocean, although abundant evidence was found that flowing liquids have existed on the surface. Here we provide definitive…
The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release
Castander, Francisco J.; Brandt, W. N.; Shen, Yue +41 more
We present the fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase of over 30,000 entries since the previous edition. The catalog consists of the objects in the SDSS Fifth Data Release that have luminosities larger than Mi=-22.0 (in a cosmology with H0…
The Infrared Camera (IRC) for AKARI -- Design and Imaging Performance
Pearson, C. P.; Ohyama, Y.; Takagi, T. +25 more
The Infrared Camera (IRC) is one of two focal-plane instruments on the AKARI satellite. It is designed for wide-field deep imaging and low-resolution spectroscopy in the near- to mid-infrared (1.8-26.5'