Showing 2006 · astro-phShow all

139 papers · 2 filters

astro-ph2006★ 163 cited

Spitzer Observations of 3C Quasars and Radio Galaxies: Mid-Infrared Properties of Powerful Radio Sources

K. Cleary, C. R. Lawrence, J. A. Marshall +2

We have measured mid-infrared radiation from an orientation-unbiased sample of 3CRR galaxies and quasars at redshifts 0.4 < z < 1.2 with the IRS and MIPS instruments on the Spitzer…

astro-ph2006★ 33 cited

IR Background Anisotropies in Spitzer GOODS images and constraints on first galaxies

Asantha Cooray, Ian Sullivan, Ranga-Ram Chary +6

We describe the angular power spectrum of unresolved 3.6 micron IR light in Spitzer GOODS fields. The amplitude of the anisotropy spectrum decreases with decreasing flux threshold…

astro-ph2006★ 1.8k cited

New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy

Adam G. Riess, Louis-Gregory Strolger, Stefano Casertano +18

We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to trace the history of cosmic expansion over the last 10 billion yea…

astro-ph2006★ 207 cited

Turbulent Mixing and the Dead Zone in Protostellar Disks

N. J. Turner, T. Sano, N. Dziourkevitch

We investigate the conditions for the presence of a magnetically inactive dead zone in protostellar disks, using 3-D shearing-box MHD calculations including vertical stratification…

astro-ph2006★ 89 cited

The 15 - 20 Micron Spitzer Spectra of Interstellar Emission Features in NGC 7023

K. Sellgren, K. I. Uchida, M. W. Werner

We present 15 - 20 micron long-slit spectra, from the Infrared Spectrograph (IRS) on Spitzer, of NGC 7023. We observe recently-discovered interstellar emission features, at 15.9, 1…

astro-ph2006★ 20 cited

Rotation and Color Properties of the Nucleus of Comet 2P/Encke

S. C. Lowry, P. R. Weissman

We present results from CCD observations of comet 2P/Encke acquired at Steward Observatory's 2.3m Bok Telescope on Kitt Peak obtained in Oct. 2002, when the comet was near aphelion…

astro-ph2006★ 27 cited

First Terrestrial Soft X-ray Auroral Observation by The Chandra X-ray Observatory

Anil Bhardwaj, G. Randall Gladstone, Ronald F. Elsner +6

Northern auroral regions of Earth were imaged with energetic photons in the 0.1-10 keV range using the High-Resolution Camera (HRC-I) aboard the Chandra X-ray Observatory at 10 epo…

astro-ph2006★ 39 cited

Benzene formation in the inner regions of protostellar disks

Paul M. Woods, Karen Willacy

Benzene (c-C6H6) formation in the inner 3 AU of a protostellar disk can be efficient, resulting in high abundances of benzene in the midplane region. The formation mechanism is dif…

astro-ph2006★ 6 cited

Infrared Counterparts to Chandra X-Ray Sources in the Antennae

D. M. Clark, S. S. Eikenberry, B. R. Brandl +7

We use deep J and Ks images of the Antennae (NGC 4038/9) obtained with WIRC on the Palomar 200-inch telescope, together with the Chandra X-ray source list of Zezas et al. (2002a),…

astro-ph2006★ 15 cited

Interferometric Observations of RS Ophiuchi and the Origin of the Near-IR Emission

B. F. Lane, J. L. Sokoloski, R. K. Barry +7

We report observations of the recurrent nova RS Oph using long-baseline near-IR interferometry. We are able to resolve emission from the nova for several weeks after the February 2…

astro-ph2006★ 175 cited

Large Structures and Galaxy Evolution in COSMOS at z < 1.1

N. Scoville, H. Aussel, A. Benson +25

We present the first identification of large-scale structures (LSS) at z in the Cosmic Evolution Survey (COSMOS). The structures are identified from adaptive smoothing of g…

astro-ph2006★ 510 cited

COSMOS : Hubble Space Telescope Observations

N. Scoville, A. Benson, A. W. Blain +50

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. Her…

astro-ph2006★ 369 cited

Debris disks in main sequence binary systems

D. E. Trilling, J. A. Stansberry, K. R. Stapelfeldt +8

We observed 69 A3-F8 main sequence binary star systems using the Multiband Imaging Photometer for Spitzer onboard the Spitzer Space Telescope. We find emission significantly in exc…

astro-ph2006★ 71 cited

Multiaperture Photometry of Galaxies in the Coma Cluster

P. R. Eisenhardt, R. De Propris, A. Gonzalez +3

We present a set of photometry for 745 band selected objects in a region centered on the core of the Coma cluster. This includes 516 galaxi…

astro-ph2006★ 192 cited

New Debris Disks Around Nearby Main Sequence Stars: Impact on The Direct Detection of Planets

C. Beichman, G. Bryden, K. Stapelfeldt

Using the MIPS instrument on the Spitzer telescope, we have searched for infrared excesses around a sample of 82 stars, mostly F, G, and K main-sequence field stars, along with a s…

astro-ph2006★ 99 cited

A Solution to the Galactic Foreground Problem for LISA

Jeff Crowder, Neil Cornish

Low frequency gravitational wave detectors, such as the Laser Interferometer Space Antenna (LISA), will have to contend with large foregrounds produced by millions of compact galac…

astro-ph2006★ 118 cited

On the Nature of the Dust in the Debris Disk Around HD69830

C. M. Lisse, C. A. Beichman, G. Bryden +1

We have used the infrared mineralogical model derived from the Spitzer IRS observations of the Deep Impact experiment to study the nature of the dust in the debris found around the…

astro-ph2006★ 82 cited

MAXIPOL: Cosmic Microwave Background Polarimetry Using a Rotating Half-Wave Plate

B. R. Johnson, J. Collins, M. E. Abroe +20

We discuss MAXIPOL, a bolometric balloon-borne experiment designed to measure the E-mode polarization of the cosmic microwave background radiation (CMB). MAXIPOL is the first bolom…

astro-ph2006★ 22 cited

Stellar and Molecular Radii of a Mira Star: First Observations with the Keck Interferometer Grism

J. A. Eisner, J. R. Graham, R. L. Akeson +6

Using a new grism at the Keck Interferometer, we obtained spectrally dispersed (R ~ 230) interferometric measurements of the Mira star R Vir. These data show that the measured radi…

astro-ph2006★ 60 cited

Observations of the Li, Be, and B isotopes and constraints on cosmic-ray propagation

G. A. de Nolfo, I. V. Moskalenko, W. R. Binns +14

The abundance of Li, Be, and B isotopes in galactic cosmic rays (GCR) between E=50-200 MeV/nucleon has been observed by the Cosmic Ray Isotope Spectrometer (CRIS) on NASA's ACE mis…

astro-ph2006★ 91 cited

Improved Measurements of the CMB Power Spectrum with ACBAR

C. L. Kuo, P. A. R. Ade, J. J. Bock +13

We report improved measurements of temperature anisotropies in the cosmic microwave background (CMB) radiation made with the Arcminute Cosmology Bolometer Array Receiver (ACBAR). I…

astro-ph2006★ 339 cited

Transience of hot dust around sun-like stars

M. C. Wyatt, R. Smith, J. S. Greaves +3

There is currently debate over whether the dust content of planetary systems is stochastically regenerated or originates in planetesimal belts evolving in steady state. In this pap…

astro-ph2006★ 47 cited

MAXIPOL: Data Analysis and Results

J. H. P. Wu, J. Zuntz, M. E. Abroe +17

We present results from and the analysis of data from MAXIPOL, a balloon-borne experiment designed to measure the polarization in the Cosmic Microwave Background (CMB). MAXIPOL is…

astro-ph2006★ 222 cited

The Peculiar SN 2005hk: Do Some Type Ia Supernovae Explode as Deflagrations?

M. M. Phillips, W. Li, J. A. Frieman +41

We present extensive u'g'r'i'BVRIYJHKs photometry and optical spectroscopy of SN 2005hk. These data reveal that SN 2005hk was nearly identical in its observed properties to SN 2002…