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Method for Spot Detection on Solar-like Stars
Silva, Adriana V. R.
As a planet eclipses its parent star, a dark starspot may be occulted, causing a detectable variation in the light curve. This work describes how features on the surface of a solar-like star can be studied by using planetary transits. Images of the Sun were used in order to simulate such transits, with the planet being modeled as a dark disk at va…
The Canada-UK Deep Submillimeter Survey. VI. The 3 Hour Field
Ivison, R. J.; Clements, D. L.; Dunne, L. +6 more
We present the complete submillimeter data for the Canada-UK Deep Submillimeter Survey (CUDSS) 3h field. The observations were taken with the Submillimeter Common-User Bolometric Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT) on Mauna Kea. The 3h field is one of two main fields in our survey and covers 60 arcmin
Spectroscopy of the near-nuclear regions of Cygnus A: estimating the mass of the supermassive black hole
Marconi, A.; Axon, D.; Jackson, N. +3 more
We use a combination of high spatial resolution optical and near-infrared spectroscopic data to make a detailed study of the kinematics of the narrow-line region (NLR) gas in the near-nuclear regions of the powerful, FRII radio galaxy Cygnus A (z= 0.0560), with the overall goal of placing limits on the mass of any supermassive black hole in the co…
Anomalous Ultraviolet Line Flux Ratios in the Cataclysmic Variables 1RXS J232953.9+062814, CE 315, BZ Ursae Majoris, and EY Cygni, Observed with the Hubble Space Telescope Space Telescope Imaging Spectrograph
Szkody, Paula; Sion, Edward M.; Hubeny, Ivan +6 more
Brief Hubble Space Telescope Space Telescope Imaging Spectrograph spectroscopic snapshot exposures of the cataclysmic variables 1RXS J232953.9+062814, CE 315, BZ UMa, and EY Cyg reveal very large N V/C IV line flux ratios, similar to those observed in AE Aqr. Such anomalous line flux ratios have so far been observed in 10 systems and presumably re…
Molecular Gas in NUclei of GAlaxies (NUGA). I. The counter-rotating LINER NGC 4826
Tacconi, L. J.; Hunt, L. K.; Schinnerer, E. +8 more
We present new high-resolution observations of the nucleus of the counter-rotating LINER NGC 4826, made in the J=1-0 and J=2-1 lines of 12CO with the IRAM Plateau de Bure mm-interferometer(PdBI).The CO maps, which achieve 0.8arcsec (16 pc) resolution in the 2-1 line, fully resolve an inner molecular gas disk which is truncated at an out…
Observations of 1000 km s−1 Doppler shifts in 107 K solar flare supra-arcade
Innes, D. E.; McKenzie, D. E.; Wang, Tongjiang
An X1.5 flare on the west limb of the Sun on 21 April 2002 developed a large supra-arcade about 30 min after flare onset. The growth of the supra-arcade can be followed in both TRACE 195 Å images and SUMER spectra. Its growth seems to be associated with dark (in TRACE images), sunward moving channels that descend onto the arcade from above. SUMER …
The DEEP Groth Strip Survey. VII. The Metallicity of Field Galaxies at 0.26 < z < 0.82 and the Evolution of the Luminosity-Metallicity Relation
Kobulnicky, Henry A.; Weiner, Benjamin J.; Faber, S. M. +6 more
Using spectroscopic data from the Deep Extragalactic Evolutionary Probe Groth Strip Survey (DGSS), we analyze the gas-phase oxygen abundances in the warm ionized medium for 64 emission-line field galaxies in the redshift range 0.26<z<0.82. These galaxies comprise a small subset selected from among 693 objects in the DGSS. They are chosen for…
The Nature of Damped Lyα Absorbing Galaxies at z <= 1: A Photometric Redshift Survey of Damped Lyα Absorbers
Chen, Hsiao-Wen; Lanzetta, Kenneth M.
We study the nature of damped Lyα absorption (DLA) systems at z<=1 using a sample of 11 DLA galaxies, for which accurate redshift measurements are available. Five of the 11 systems are identified in our ongoing photometric redshift survey of DLA galaxies, while the remaining six systems are identified by previous groups using either spectroscop…
CO (J=7-->6) Observations of NGC 253: Cosmic-Ray-heated Warm Molecular Gas
Bolatto, A. D.; Stacey, G. J.; Bradford, C. M. +5 more
We report observations of the CO J=7-->6 transition toward the starburst nucleus of NGC 253. This is the highest excitation CO measurement in this source to date and allows an estimate of the molecular gas excitation conditions. Comparison of the CO line intensities with a large velocity gradient, escape probability model indicates that the bul…
Surface brightness profiles and structural parameters for 10 rich stellar clusters in the Small Magellanic Cloud
Mackey, A. D.; Gilmore, G. F.
As a follow-up to our recent study of a large sample of Large Magellanic Cloud (LMC) clusters, we have conducted a similar study of the structures of 10 Small Magellanic Cloud (SMC) clusters, using archival Hubble Space Telescope snapshot data. We present surface brightness profiles for each cluster and derive structural parameters, including core…