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Keck Spectroscopy of Globular Clusters in the Elliptical Galaxy NGC 3610
Brodie, Jean P.; Seitzer, Patrick; Strader, Jay +2 more
We present low-resolution Keck spectra of nine candidate globular clusters in the possible merger-remnant elliptical galaxy NGC 3610. Eight of the objects appear to be bona fide globular clusters of NGC 3610. We find that two of the clusters belong to an old metal-poor population, five to an old metal-rich population, and only one to an intermedia…
The Globular Cluster System of the Spiral Galaxy NGC 7814
Zepf, Stephen E.; Rhode, Katherine L.
We present the results of a wide-field photometric study of the globular cluster (GC) system of the edge-on Sab spiral NGC 7814. This is the first spiral to be fully analyzed from our survey of the GC systems of a large sample of galaxies beyond the Local Group. NGC 7814 is of particular interest because a previous study estimated that it has 500-…
STIS Spectral Imagery of the OB Stars in NGC 604. II. The Most Luminous Stars
Bruhweiler, Fred C.; Miskey, Cherie L.; Smith Neubig, Margaret
We present results using two-dimensional spectral imagery and photometry obtained with the Hubble Space Telescope (HST) for the starburst H II region NGC 604, in the nearby galaxy M33. The spectral imagery was acquired with the Space Telescope Imaging Spectrograph (STIS) using the MAMA-G140L configuration, which provided wavelength coverage spanni…
Probing the Complex and Variable X-Ray Absorption of Markarian 6 with XMM-Newton
Brandt, W. N.; Bauer, Franz E.; Vignali, Cristian +4 more
We report on an X-ray observation of the Seyfert 1.5 galaxy Mrk 6 obtained with the EPIC instruments on board XMM-Newton. Archival BeppoSAX Phoswich Detection System data from 18-120 keV were also used to constrain the underlying hard power-law continuum. The results from our spectral analyses generally favor a double partial-covering model, altho…
Coronagraphic Imaging of 3C 273 with the Advanced Camera for Surveys
Ford, H. C.; Infante, L.; Zheng, W. +32 more
The nearby and luminous QSO 3C 273 was imaged in 2002 July with the High Resolution Channel (HRC) of the Advanced Camera for Surveys (ACS) in coronagraphic mode in F475W (g), F606W (V), and F814W (I) as part of the Early Release Observations (ERO) program. After subtraction of the remaining PSF of the QSO, these images offer the most detailed view…
Hubble Space Telescope STIS Observations of Comet 19P/Borrelly during the Deep Space 1 Encounter
Stern, S. A.; Weaver, H. A.; Parker, J. Wm.
In support of the NASA Deep Space 1 (DS1) mission to comet 19P/Borrelly, we obtained Hubble Space Telescope (HST) images and ultraviolet (UV) spectra of the comet near the time of the DS1 flyby in 2001 September. The HST data provide context information on 19P/Borrelly's circumnuclear dust environment, the rotational period and rotational phase of…
Astrometry with The Hubble Space Telescope: A Parallax of the Central Star of the Planetary Nebula NGC 6853
McArthur, B. E.; Franz, O. G.; Bradley, A. J. +17 more
We present an absolute parallax and relative proper motion for the central star of the planetary nebula NGC 6853 (the Dumbbell). We obtain these with astrometric data from the Fine Guidance Sensor 3, a white-light interferometer on the Hubble Space Telescope. Spectral classifications and VRIJHKT2M and DDO51 photometry of the stars makin…
Imaging and Demography of the Host Galaxies of High-Redshift Type Ia Supernovae
Filippenko, Alexei V.; Williams, Benjamin F.; Garnavich, Peter +24 more
We present the results of a study of the host galaxies of high-redshift Type Ia supernovae (SNe Ia). We provide a catalog of 18 hosts of SNe Ia observed with the Hubble Space Telescope (HST) by the High-z Supernova Search Team, including images, scale lengths, measurements of integrated (Hubble-equivalent) BVRIZ photometry in bands where the galax…
Central Proper-Motion Kinematics of NGC 6752
Bailyn, C. D.; Drukier, G. A.; Van Altena, W. F. +1 more
We present proper motions derived from Wide Field Planetary Camera 2 (WFPC2) imaging for stars in the core of the peculiar globular cluster NGC 6752. The central velocity dispersion in both components of the proper motion is 12 km s-1. We discuss the implications of this result, as well as the intrinsic difficulties in making such measu…
Astrometric Positions and Proper Motions of 19 Radio Stars
Zacharias, N.; Claussen, M. J.; de Vegt, C. +4 more
We have used the Very Large Array, linked with the Pie Town Very Long Baseline Array antenna, to determine the astrometric positions of 19 radio stars in the International Celestial Reference Frame (ICRF). The positions of these stars were directly linked to the positions of distant quasars through phase-referencing observations. The positions of …