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astro-ph2009★ 134 cited

High Albedos of Low Inclination Classical Kuiper Belt Objects

M. J. Brucker, W. M. Grundy, J. A. Stansberry +4

We present observations of thermal emission from fifteen transneptunian objects (TNOs) made using the Spitzer Space Telescope. Thirteen of the targets are members of the Classical…

astro-ph2008★ 11 cited

High Accuracy Near-infrared Imaging Polarimetry with NICMOS

D. Batcheldor, G. Schneider, D. C. Hines +5

The findings of a nine orbit calibration plan carried out during HST Cycle 15, to fully determine the NICMOS camera 2 (2.0 micron) polarization calibration to high accuracy, are re…

astro-ph2008★ 16 cited

Constraints on Dark Energy from the Observed Expansion of our Cosmic Horizon

Fulvio Melia

Within the context of standard cosmology, an accelerating universe requires the presence of a third `dark' component of energy, beyond matter and radiation. The available data, how…

astro-ph2008★ 12 cited

Time evolution of Wouthuysen-Field coupling

I. Roy, W. Xu, J. -M. Qiu +2

We study the Wouthuysen-Field coupling at early universe with numerical solutions of the integrodifferential equation describing the kinetics of photons undergoing resonant scatter…

astro-ph2008★ 143 cited

Shattering and coagulation of dust grains in interstellar turbulence

Hiroyuki Hirashita, Huirong Yan

We investigate shattering and coagulation of dust grains in turbulent interstellar medium (ISM). The typical velocity of dust grain as a function of grain size has been calculated…

astro-ph2008★ 100 cited

Determination of the minimum masses of heavy elements in the envelopes of Jupiter and Saturn

Olivier Mousis, Ulysse Marboeuf, Jonathan I. Lunine +5

We calculate the minimum mass of heavy elements required in the envelopes of Jupiter and Saturn to match the observed oversolar abundances of volatiles. Because the clathration eff…

astro-ph2008★ 52 cited

A spatially resolved study of photoelectric heating and [CII] cooling in the LMC

D. Rubin, S. Hony, S. C. Madden +20

(abridged) We study photoelectric heating throughout the Large Magellanic Cloud. We quantify the importance of the [CII] cooling line and the photoelectric heating process of vario…

astro-ph2008★ 28 cited

Infrared Emission by Dust Around lambda Bootis Stars: Debris Disks or Thermally Emitting Nebulae?

J. R. Martínez-Galarza, I. Kamp, K. Y. L. Su +3

We present a model that describes stellar infrared excesses due to heating of the interstellar (IS) dust by a hot star passing through a diffuse IS cloud. This model is applied to…

astro-ph2008★ 52 cited

The Young, Massive, Star Cluster Sandage-96 After the Explosion of SN 2004dj in NGC 2403

J. Vinko, K. Sarneczky, Z. Balog +12

The bright Type II-plateau supernova (SN) 2004dj occurred within the young, massive stellar cluster Sandage-96 in a spiral arm of NGC 2403. New multi-wavelength observations obtain…

astro-ph2008★ 1 cited

Stellar Age Estimation from ~3 Myr to ~3 Gyr

Lynne Hillenbrand, Eric Mamajek, John Stauffer +3

We present recent progress on quantitative estimation of stellar ages using ind icators such as theoretical evolutionary tracks, rotation, rotation-driven chrom ospheric and corona…

astro-ph2008★ 19 cited

Alternative Data Reduction Procedures for UVES: Wavelength Calibration and Spectrum Addition

Rodger I. Thompson, Jill Bechtold, John H. Black +1

This paper addresses alternative procedures to the ESO supplied pipeline procedures for the reduction of UVES spectra of two quasar spectra to determine the value of the fundamenta…

astro-ph2008★ 48 cited

Spitzer observations of extended Lyman-alpha Clouds in the SSA22 field

T. M. A. Webb, T. Yamada, J. -S. Huang +5

We present the results of a Spitzer IRAC and MIPS 24 micron study of extended Lyman-alpha clouds (or Lyman-alpha Blobs, LABs) within the SSA22 filamentary structure at z = 3.09. We…

astro-ph2008★ 70 cited

The IR Luminosity Functions of Rich Clusters

Lei Bai, George H. Rieke, Marcia J. Rieke +2

We present MIPS observations of the cluster A3266. About 100 spectroscopic cluster members have been detected at 24 micron. The IR luminosity function in A3266 is very similar to t…

astro-ph2008★ 107 cited

The spatial clustering of X-ray selected AGN in the XMM-COSMOS field

R. Gilli, G. Zamorani, T. Miyaji +70

We study the spatial clustering of 538 X-ray selected AGN in the 2 deg^2 XMM-COSMOS field that are spectroscopically identified to I_{AB}<23 and span the redshift range z=0.2-3.0.…

astro-ph2008★ 13 cited

The very short supersoft X-ray state of the classical nova M31N 2007-11a

M. Henze, W. Pietsch, G. Sala +9

Short supersoft X-ray source (SSS) states (durations < 100 days) of classical novae (CNe) indicate massive white dwarfs that are candidate progenitors of supernovae type Ia. We car…

astro-ph2008★ 7 cited

Periodic Variables in the Open Cluster NGC 2301

Tuguldur Sukhbold, Steve B. Howell

We present the results of a search for periodic variables within 4078 time-series light curves and an analysis of the period-color plane for stars in the field of the open cluster…

astro-ph2008★ 34 cited

Constraints on the Size of Extra Dimensions from the Orbital Evolution of the Black-Hole X-Ray Binary XTE J1118+480

Tim Johannsen

In a universe of the Randall-Sundrum type, black holes are unstable and emit gravitational modes in the extra dimension. This leads to dramatically shortened lifetimes of astrophys…

astro-ph2008★ 5.4k cited

The Seventh Data Release of the Sloan Digital Sky Survey

K. Abazajian

This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDS…

astro-ph2008★ 17 cited

On-sky wide field adaptive optics correction using multiple laser guide stars at the MMT

Christoph Baranec, Michael Hart, N. Mark Milton +6

We describe results from the first astronomical adaptive optics system to use multiple laser guide stars, located at the 6.5-m MMT telescope in Arizona. Its initial operational mod…

astro-ph2008★ 3 cited

Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion Models

Patrick Young, Carola I. Ellinger, Francis X. Timmes +10

We examine observed heavy element abundances in the Cassiopeia A supernova remnant as a constraint on the nature of the Cas A supernova. We compare bulk abundances from 1D and 3D e…

astro-ph2008★ 77 cited

The Spitzer Infrared Nearby Galaxies Survey: A High-Resolution Spectroscopy Anthology

D. A. Dale, J. D. T. Smith, E. A. Schlawin +18

High resolution mid-infrared spectra are presented for 155 nuclear and extranuclear regions from the Spitzer Infrared Nearby Galaxies Survey (SINGS). The fluxes for nine atomic for…

astro-ph2008★ 145 cited

The COSMOS AGN Spectroscopic Survey I: XMM Counterparts

Jonathan R. Trump, Chris D. Impey, Martin Elvis +17

We present optical spectroscopy for an X-ray and optical flux-limited sample of 677 XMM-Newton selected targets covering the 2 deg^2 COSMOS field, with a yield of 485 high-confiden…

astro-ph2008★ 113 cited

Extended Lyman Alpha Nebulae at z ~ 2.3: An Extremely Rare and Strongly Clustered Population?

Yujin Yang, Ann Zabludoff, Christy Tremonti +2

To obtain an unbiased sample of bright LyA blobs [L(LyA) > 10^43 ergs/s], we have undertaken a blind, wide-field, narrow-band imaging survey in the NOAO Deep Wide Field Survey Boot…

astro-ph2008★ 43 cited

Astrometry with the Keck-Interferometer: the ASTRA project and its science

Jorg-Uwe Pott, Julien Woillez, Rachel L. Akeson +22

The sensitivity and astrometry upgrade ASTRA of the Keck Interferometer is introduced. After a brief overview of the underlying interferometric principles, the technology and conce…