Search Publications
Excitation of banded whistler waves in the magnetosphere
Gary, S. Peter; Liu, Kaijun; Winske, Dan
Linear kinetic dispersion analysis and a two-dimensional electromagnetic particle-in-cell simulation are performed to demonstrate a possible excitation mechanism of banded whistler waves in the magnetosphere outside of the plasmapause. Whistler waves in the lower and the upper bands can be generated simultaneously by the whistler anisotropy instab…
Distance determination for RAVE stars using stellar models. III. The nature of the RAVE survey and Milky Way chemistry
Gilmore, G.; Freeman, K. C.; Munari, U. +19 more
We apply the method of Burnett & Binney (2010, MNRAS, 407, 339) for the determination of stellar distances and parameters to the internal catalogue of the RAdial Velocity Experiment (RAVE; Steinmetz et al. 2006, AJ, 132, 1645). Subsamples of stars that either have Hipparcos parallaxes or belong to well-studied clusters inspire confidence in th…
A Multiphase Absorber Containing O VI and Broad H I Directly Tracing 106 K Plasma at Low Redshift Toward HE 0153-4520
Savage, B. D.; Narayanan, A.; Wakker, B. P. +1 more
Observations of the QSO HE 0153-4520 (z em = 0.450) with the Cosmic Origins Spectrograph (COS) from 1134 to 1796 Å with a resolution of ~17 km s-1 and a signal-to-noise ratio per resolution element of 20-40 are used to study a multiphase partial Lyman limit system (LLS) at z = 0.22601 tracing both cool and hot gas. Far-Ultrav…
Molecular Gas in Lensed z >2 Quasar Host Galaxies and the Star Formation Law for Galaxies with Luminous Active Galactic Nuclei
Riechers, Dominik A.
We report the detection of luminous CO(J = 2→1), CO(J = 3→2), and CO(J = 4→3) emission in the strongly lensed high-redshift quasars B1938+666 (z = 2.059), HE 0230-2130 (z = 2.166), HE 1104-1805 (z = 2.322), and B1359+154 (z = 3.240), using the Combined Array for Research in Millimeter-wave Astronomy. B1938+666 was identified in a "blind" CO redshi…
A serendipitous XMM survey of the SDSS: the evolution of the colour-magnitude diagram of X-ray AGN from z= 0.8 to 0.1
Nandra, K.; Georgakakis, Antonis
A new serendipitous XMM survey in the area of the Sloan Digital Sky Survey is described (XMM/SDSS), which includes features such as merging of overlapping fields to increase the sensitivity to faint sources, use of a new parametrization of the XMM point spread function for the source detection and photometry and an accurate estimation of the surve…
Star Formation from DLA Gas in the Outskirts of Lyman Break Galaxies at z ~ 3
Rafelski, Marc; Chen, Hsiao-Wen; Wolfe, Arthur M.
We present evidence for spatially extended low surface brightness emission around Lyman break galaxies (LBGs) in the V-band image of the Hubble Ultra Deep Field, corresponding to the z ~ 3 rest-frame far-UV (FUV) light, which is a sensitive measure of star formation rates (SFRs). We find that the covering fraction of molecular gas at z ~ 3 is not …
Stardust-NExT, Deep Impact, and the accelerating spin of 9P/Tempel 1
Licandro, Javier; Vincent, J. -B.; Bhatt, B. C. +68 more
The evolution of the spin rate of Comet 9P/Tempel 1 through two perihelion passages (in 2000 and 2005) is determined from 1922 Earth-based observations taken over a period of 13 year as part of a World-Wide observing campaign and from 2888 observations taken over a period of 50 days from the Deep Impact spacecraft. We determine the following sider…
Constraining the star formation and the assembly histories of normal and compact early-type galaxies at 1 < z < 2
Longhetti, M.; Gargiulo, A.; Saracco, P.
We present a study based on a sample of 62 early-type galaxies (ETGs) at 0.9 < zspec < 2 aimed at constraining their past star formation and mass assembly histories. The sample is composed of normal ETGs having effective radii comparable to the mean radius of local ones and of compact ETGs having effective radii from two to six ti…
Discovery of an Ultrasoft X-Ray Transient Source in the 2XMM Catalog: A Tidal Disruption Event Candidate
Lin, Dacheng; Grupe, Dirk; Carrasco, Eleazar R. +3 more
We have discovered an ultrasoft X-ray transient source, 2XMMi J184725.1-631724, which was detected serendipitously in two XMM-Newton observations in the direction of the center of the galaxy IC 4765-f01-1504 at a redshift of 0.0353. These two observations were separated by 211 days, with the 0.2-10 keV absorbed flux increasing by a factor of about…
Titan's obliquity as evidence of a subsurface ocean?
Karatekin, Ö.; Baland, R. -M.; van Hoolst, T. +1 more
On the basis of gravity and radar observations with the Cassini spacecraft, the moment of inertia of Titan and the orientation of Titan's rotation axis have been estimated in recent studies. According to the observed orientation, Titan is close to the Cassini state. However, the observed obliquity is inconsistent with the estimate of the moment of…