Search Publications
Dusty Debris around Solar-Type Stars: Temporal Disk Evolution
Zuckerman, B.; Silverstone, M. D.; Becklin, E. E. +2 more
Using ISO-ISOPHOT, we carried out a survey of almost 150 stars to search for evidence of emission from dust orbiting young main-sequence stars, both in clusters and isolated systems. Over half of the detections are new examples of dusty stellar systems and demonstrate that such dust can be detected around numerous stars older than a few times 10
The Origin of C IV Absorption Systems at Redshifts z < 1: Discovery of Extended C IV Envelopes around Galaxies
Chen, Hsiao-Wen; Lanzetta, Kenneth M.; Webb, John K.
We report the discovery of extended C IV gaseous envelopes around galaxies of a wide range of luminosity and morphological type. First, we show that C IV absorption systems are strongly clustered around galaxies on velocity scales of v<~250 km s-1 and impact parameter scales of ρ<~100 h-1 kpc, but not on larger velocity…
Complete and Simultaneous Spectral Observations of the Black Hole X-Ray Nova XTE J1118+480
Garnavich, P. M.; Groot, P. J.; Miller, J. M. +13 more
The X-ray nova XTE J1118+480 suffers minimal extinction (b=62deg) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. conducted the first such study, which was centered on 2000 April 8 using UKIRT, EUVE, HST, and RXTE. On 2000 April 18, the Chandra X-Ray Observatory obtained data coincident with…
A Serendipitous Galaxy Cluster Survey with XMM: Expected Catalog Properties and Scientific Applications
Romer, A. Kathy; Viana, Pedro T. P.; Liddle, Andrew R. +1 more
This paper describes a serendipitous galaxy cluster survey that we plan to conduct with the XMM X-ray satellite. We have modeled the expected properties of such a survey for three different cosmological models, using an extended Press-Schechter formalism combined with a detailed characterization of the expected capabilities of the European Photon …
Solar Neutrino Emission Deduced from a Seismic Model
Kosovichev, A. G.; Christensen-Dalsgaard, J.; García, R. A. +10 more
Three helioseismic instruments on the Solar and Heliospheric Observatory have observed the Sun almost continuously since early 1996. This has led to detailed study of the biases induced by the instruments that measure intensity or Doppler velocity variation. Photospheric turbulence hardly influences the tiny signature of conditions in the energy-g…
The Frequency of Binary Stars in the Core of 47 Tucanae
Albrow, Michael D.; Sarajedini, Ata; Gilliland, Ronald L. +3 more
Differential time series photometry has been derived for 46,422 main-sequence stars in the core of 47 Tucanae. The observations consisted of near-continuous 160 s exposures alternating between the F555W and F814W filters for 8.3 days in 1999 July with the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Using Fourier and other search m…
A Chandra X-Ray Study of NGC 1068. I. Observations of Extended Emission
Young, A. J.; Wilson, A. S.; Shopbell, P. L.
We report subarcsecond-resolution X-ray imaging spectroscopy of the archetypal type 2 Seyfert galaxy NGC 1068 with the Chandra X-Ray Observatory. The observations reveal the detailed structure and spectra of the 13 kpc extent nebulosity previously imaged at lower resolution with ROSAT. The Chandra image shows a bright, compact source coincident wi…
Near-Infrared Integral Field Spectroscopy and Mid-Infrared Spectroscopy of the Starburst Galaxy M82
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +2 more
We present new infrared observations of the central regions of the starburst galaxy M82. The observations consist of near-infrared integral field spectroscopy in the H and K bands obtained with the MPE 3D instrument and of λ=2.4-45 µm spectroscopy from the Short Wavelength Spectrometer (SWS) onboard the Infrared Space Observatory. These meas…
First Results from the Anglo-Australian Planet Search: A Brown Dwarf Candidate and a 51 Peg-like Planet
Butler, R. Paul; Vogt, Steven S.; Henry, Gregory W. +5 more
We report results from the Anglo-Australian Planet Search, a survey for planets around 200 solar-type stars in the southern hemisphere that is being carried out on the 3.9 m Anglo-Australian Telescope. Limiting Doppler precisions of 3 m s-1 have been demonstrated from the first 2.5 years of operation, making this the highest-precision planet searc…
Chandra Exposes the Core-collapsed Globular Cluster NGC 6397
Heinke, C. O.; Cool, A. M.; Grindlay, J. E. +2 more
We report results of the Chandra deep-imaging observation of the closest post-core-collapse globular cluster, NGC 6397. Some 25 sources are detected within 2' of the cluster center, of which ~20 are likely cluster members, with LX>~3×1029 ergs s-1. The X-ray spectra suggest identifications with one quiescent low…