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Anglo-Australian Telescope Imaging and Microslit Spectroscopy in the Southern Hubble Deep Field
Glazebrook, Karl; Mann, Robert G.; Verma, Aprajita +3 more
We present a deep photometric (B- and R-band) catalog and an associated spectroscopic redshift survey conducted in the vicinity of the Hubble Deep Field-South. The spectroscopy yields 53 extragalactic redshifts in the range 0<z<1.4, substantially increasing the body of spectroscopic work in this field to over 200 objects. The targets are sel…
MERLIN Astrometry of 11 Radio Stars
Garrington, Simon T.; Fey, Alan L.; Boboltz, David A. +3 more
We report accurate positions in the International Celestial Reference Frame (ICRF) for 11 radio stars. Observations were made using the Multi-Element Radio Linked Interferometer Network at a radio frequency of 5 GHz. The positions are estimated to be accurate at the 5 mas level. Positions were obtained directly in the ICRF by phase referencing the…
Near-Ultraviolet Sources in the Great Observatories Origins Deep Survey Fields
Gardner, Jonathan P.; Grogin, N. A.; Dahlen, T. +1 more
We present an ultraviolet-selected sample of 268 objects in the two fields of the Great Observatories Origins Deep Survey (GOODS). We used the parallel observations taken with the Wide Field Planetary Camera 2 in the U band (F300W), which covered 88% of the GOODS fields, to identify sources and selected only objects with GOODS Advanced Camera for …
Variable Stars in the Large Magellanic Cloud: Discovery of Extragalactic W UMa Binaries
Rucinski, Slavek M.; Kaluzny, Janusz; Mochnacki, Stefan
We observed a field in the disk of the LMC on two consecutive nights in search of rapid variable stars. We found two pulsating stars of type RRab and δ Scuti and four binary stars; among the latter we found one sdB or cataclysmic variable below the LMC blue main sequence and three very close binary systems on the main sequence. At least one of the…
The Relationship Between Baryons and Dark Matter in Extended Galaxy Halos
Stocke, J. T.; Putman, M. E.; Rosenberg, J. L. +1 more
The relationship between gas-rich galaxies and Lyα absorbers is addressed in this paper in the context of the baryonic content of galaxy halos. Deep Arecibo H I observations are presented of two gas-rich spiral galaxies within 125 h-170 kpc projected distance of a Lyα absorber at a similar velocity. The galaxies investigated …
Swift Observations of the Highly X-Ray Variable Narrow-Line Seyfert 1 Galaxy RX J0148.3-2758
O'Brien, Paul T.; Schady, Patricia; Leighly, Karen M. +4 more
We report on Swift observations of the narrow-line Seyfert 1 galaxy RX J0148.3-2758. It was observed for 41.6 ks in 2005 May and for 15.8 ks in 2005 December. On short as well as on long timescales, RX J0148.3-2758 is a highly variable source. It doubles its X-ray flux within 18-25 ks. The observation of 2005 December 9, which had a flux 4 times l…
Orbits and Differential Photometry for Visual Binaries A 1529, HU 610, and COU 2031
Docobo, José A.; Tamazian, Vakhtang S.
The first orbit for visual binary A 1529 and improved orbital elements for HU 610 and COU 2031 based on new speckle measurements with the 6 m telescope of the Special Astrophysical Observatory (Russia) are presented. On the basis of simultaneously obtained differential photometry data, individual masses and spectral types are roughly estimated. Th…
XMM-Newton Detection of the Rare Fanaroff-Riley Type II Broad Absorption Line Quasar FIRST J101614.3+520916
White, Richard L.; Gregg, Michael D.; Lacy, Mark +5 more
We have detected FIRST J101614.3+520916 with the XMM-Newton X-ray observatory. FIRST J101614.3+520916, one of the most extreme radio-loud, broad absorption line (BAL) quasars so far discovered, is also a Fanaroff-Riley type II radio source. We find that, compared to its estimated intrinsic X-ray flux, the observed X-rays are likely suppressed and …
HD 131861, a Double-Line Spectroscopic Triple System
Henry, Gregory W.; Pourbaix, D.; Fekel, Francis C. +1 more
Our red-wavelength spectroscopic observations of HD 131861, a previously known single-line multiple system, span 20 years. Now lines of two components, the short-period F5 V primary and G8 V secondary, have been detected. The inner orbit is circular with a period of 3.5507439 days, while the outer orbit of the system has a period of 1642 days or 4…
Spectroscopy and Photometry of the Double-lined Binary HD 149420
Henry, Gregory W.; Fekel, Francis C.
We have used new spectroscopic and photometric observations of HD 149420 to obtain an improved orbital element solution and determine some basic properties of the system. This double-lined binary has an orbital period of 3.39430 days, a circular orbit, and a mass ratio of 0.52. The primary is somewhat evolved, with an A9 IV spectral type, while th…