Search Publications
Hubble Space Telescope Images of The Seyfert Galaxies NGC 5929 And MCG 8-11-11
Heckman, Timothy M.; Mulchaey, John S.; Bower, Gary A. +3 more
We present the initial results of a program to obtain high resolution images of Seyfert galaxies with the Planetary Camera aboard the Hubble Space Telescope. In this paper we discuss the images of the type 2 Seyfert NGC 5929 and the type 1.5 Seyfert MCG 8-11-11 (=UGC 3374). The images were obtained in the emission lines of [O III] λλ4959,5007 and …
Far-Ultraviolet Photometry of the Globular Cluster Omega CEN
O'Connell, R. W.; Bohlin, R. C.; Stecher, T. P. +9 more
We present far-ultraviolet images of the globular cluster omega Centauri obtained with the Ultraviolet Imaging Telescope (UIT) during the 1990 December Astro-1 mission. A total of 1957 sources are detected at 1620 A to a limiting ultraviolet (UV) magnitude of 16.4 in the central 24 min diameter region of the field and a limit of 15.6 over the rema…
The Nuclear Regions of NGC 3311 and NGC 7768 Imaged With the Hubble Space Telescope Planetary Camera
Lauer, Tod R.; Faber, S. M.; Grillmair, Carl J. +4 more
We present high-resolution, V band images of the central regions of the brightest cluster ellipticals NGC 3311 and NGC 7768 taken with the Planetary Camera of the Hubble Space Telescope. The nuclei of both galaxies are found to be obscured by dust, though the morphology of the dust is quite different in the two cases. The dust cloud which obscures…
Ultraviolet Interstellar Absorption Line in the LMC: Searching for Hidden SNRs
Chu, Y. -H.; Wakker, B.; Mac Low, M. -M. +1 more
Strong x-ray emission detected in Large Magellanic Cloud (LMC) superbubbles has been explained as the result of interior supernova remnants (SNRs) hitting the dense superbubble shell. Such SNRs cannot be found using conventional criteria. We thus investigate the possibility of using the interstellar absorption properties in the UV as a diagnostic …
Spectroscopic, Orbital, and Physical Properties of the Binary Feige 24 and Detection of Transient He II Absorption in the System
Thorstensen, J. R.; Vennes, S.
We have obtained new high-dispersion optical spectroscopy at Kitt Peak National Observatory (KPNO) and new International Ultraviolet Explorer (IUE) spectroscopy of the white dwarf+red dwarf binary system Feige 24. The optical range shows a composite DA+dM spectrum, together with H I Balmer and He I emission. The orbital phase dependence of the emi…
Globular Clusters Photometry With the Hubble Space Telescope. III. Blue Stragglers and Variable Stars in the Core of M3
Schneider, D. P.; Yanny, B.; Guhathakurta, P. +1 more
This paper describes Hubble Space Telescope (HST)/Planetary Camera-I images of the core of the dense globular cluster M3 (NGC 5272). Stellar photometry in the F555W (V) and F785LP (I) bands, with a 1-sigma photometric accuracy of about 0.1 mag, has been used to construct color-magnitude diagrams of about 4700 stars above the main-sequence turnoff …
Additional Constraints on Circumstellar Disks in the Trapezium Cluster
Stauffer, John R.; Prosser, Charles F.; Hartmann, Lee +1 more
We discuss the new constraints on the population of compact ionized sources in the Trapezium Cluster thought to arise from the ionization by the central OB stars of circumstellar disks around low-mass pre-main sequence stars. We present new Hubble Space Telescope (HST) Planetary Camera observations of two of these candidate disk sources, resolving…
Hubble Space Telescope Medium Deep Survey. II. Deconvolution of Wide Field Camera Field Galaxy Images in the 13h+43degree Field
Gilmore, G.; Glazebrook, K.; Illingworth, G. D. +12 more
We present isophotal profiles of six faint field galaxies from some of the first deep images taken for the Hubble Space Telescope (HST) Medium Deep Survey (MDS). These have redshifts in the range z = 0.12-0.401. The images were taken with the Wide Field Camera (WFC) in "parallel mode" and deconvolved with the Lucy method using as the point-spread …
A Weak Diffuse Interstellar Band in the Far-Ultraviolet Spectrum of zeta Ophiuchi
Savage, B. D.; Tripp, T. M.; Cardelli, J. A.
Goddard High Resolution Spectrograph (GHRS) observations at 3.5 km/s resolution reveal several new weak unidentified interstellar absorption lines in the ultraviolet spectrum of zeta Ophiuchi. The unidentified line at 1369.13 A has the appearance and characteristics of a weak diffuse interstellar band (DIB). The line has a smooth profile similar t…
Gradients in Giant Branch Morphology in the Core of 47 Tucanae
Bailyn, Charles D.
I describe an algorithm which uses the high spatial resolution of the Hubble Space Telescope to complement the high spatial-to-noise, approximately symmetric point response function, relatively large spatial coverage, and standard filters available from ground based images of crowded fields. Applying this technique to the central regions of the gl…