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Probing the Intergalactic Medium-Galaxy Connection toward PKS 0405-123. II. A Cross-Correlation Study of Lyα Absorbers and Galaxies at z<0.5
Weiner, Benjamin J.; Chen, Hsiao-Wen; Mulchaey, John S. +2 more
We present a pilot study of the clustering properties of Lyα absorbers with respect to known galaxies based on 112 Lyα absorbers and 482 galaxies identified at z<0.5 along the sight line toward PKS 0405-123. The principal goal is to determine the origin of Lyα absorbers based on their cross-correlation amplitude with known galaxies and to inves…
Dynamics of cloud features on Uranus
Sromovsky, L. A.; Fry, P. M.
Near-infrared adaptive optics imaging of Uranus by the Keck 2 telescope during 2003 and 2004 has revealed numerous discrete cloud features, 70 of which were used to extend the zonal wind profile of Uranus up to 60° N. We confirmed the presence of a north-south asymmetry in the circulation [Karkoschka, E., 1998. Science 280, 570-572], and improved …
The X-ray emission properties and the dichotomy in the central stellar cusp shapes of early-type galaxies
Pellegrini, S.
The Hubble Space Telescope has revealed a dichotomy in the central surface brightness profiles of early-type galaxies, which have subsequently been grouped into two families: core, boxy, anisotropic systems; and cuspy (`power-law'), discy, rotating ones. Here we investigate whether a dichotomy is also present in the X-ray properties of the two fam…
No oceans on Titan from the absence of a near-infrared specular reflection
West, R. A.; Brown, M. E.; Roe, H. G. +2 more
With its substantial atmosphere of nitrogen, hydrocarbons and nitriles, Saturn's moon Titan is a unique planetary satellite. Photochemical processing of the gaseous constituents produces an extended haze that obscures the surface. Soon after the Voyager fly-bys in 1980 and 1981 photochemical models led to the conclusion that there should be enough…
Small Polycyclic Aromatic Hydrocarbons in the Red Rectangle
Gordon, Karl D.; Witt, Adolf N.; Vijh, Uma P.
Following our initial discovery of blue luminescence in the spectrum of the Red Rectangle (RR) and its identification as fluorescence by small three- to four-ringed polycyclic aromatic hydrocarbon (PAH) molecules, we report on the spatial correlation between the blue luminescence and the 3.3 µm emission, commonly attributed to small, neutral…
The X-ray emission from Young Stellar Objects in the ρ Ophiuchi cloud core as seen by XMM-Newton.
Grosso, N.; Montmerle, T.; Ozawa, H.
We observed the main core F of the ρ Ophiuchi cloud, an active star-forming region located at d ∼ 140 pc, using XMM-Newton with an exposure of 33 ks. We detect 87 X-ray sources within the 30 arcmin diameter field-of-view of the EPIC imaging detector array. We cross-correlate the positions of XMM-Newton X-ray sources with previous X-ray, infrared (…
Inferred acoustic rates of solar p modes from several helioseismic instruments
Goupil, M. -J.; Baudin, F.; Chaplin, W. J. +5 more
Acoustic rates of excitation of solar p modes can be estimated from observations in order to place constraints on the modelling of the excitation process and the layers where it occurs in the star. For several reasons (including a poor signal to noise ratio and mode overlap), this estimation is difficult. In this work, we use three completely inde…
A Comparison of Absorption- and Emission-Line Abundances in the Nearby Damped Lyα Galaxy SBS 1543+593
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +1 more
We have used STIS aboard HST to measure a sulfur abundance of [S/H]=-0.41+/-0.06 in the ISM of the nearby DLA galaxy SBS 1543+593. A direct comparison between this QSO absorption line abundance and abundances measured from H II region emission line diagnostics yields the same result: the abundance of sulfur in the neutral ISM is in good agreement …
The Effect of Stellar Evolution on SiC Dust Grain Sizes
Speck, Angela K.; Thompson, Grant D.; Hofmeister, Anne M.
Stars on the asymptotic giant branch (AGB) produce dust in their circumstellar shells. The nature of the dust-forming environment is influenced by the evolution of the stars, in terms of both chemistry and density, leading to an evolution in the nature of the dust that is produced. Carbon-rich AGB stars are known to produce silicon carbide (SiC). …
A Comparative Study of the Spatial Distribution of Ultraviolet and Far-Infrared Fluxes from M101
Heckman, Timothy M.; Madore, Barry F.; Tuffs, Richard J. +23 more
The total ultraviolet (UV) flux (from 1412 to 2718 Å) of M101 is compared on a pixel-to-pixel basis with the total far-infrared (FIR) flux (from 60 to 170 µm) using the maps of the galaxy taken by the Galaxy Evolution Explorer (GALEX) in the near-UV and far-UV and by the Infrared Space Observatory (ISO) at 60, 100, and 170 µm. The main…