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Hubble Space Telescope Observations of the HH 47 Jet: Narrowband Images

Hartigan, Patrick; Bally, John; Schwartz, Richard D. +4 more

Cometary Knots in the Helix Nebula

O'Dell, C. R.; Handron, Kerry D.

The Cometary Knots in the Helix Nebula have shown themselves in observations with the Hubble Space Telescope's WFPC2 to be well-resolved photoionized surfaces on the central star facing sides of neutral clouds. Material streams backwards from the rims of the ionized surfaces, producing tails. The neutral cores of the Cometary Knots are seen in ext…

The Final Archive and Recalibration of the International Ultraviolet Explorer (IUE) Satellite

Nichols, Joy S.; Linsky, Jeffrey L.

Since 1978 the International Ultraviolet Explorer (lUE) satellite has been acquiring the largest collection of astronomical ultraviolet spectra that will likely be obtained in the foreseeable future. The more than 100 000 spectral images, from which low and high dispersion spectra are extracted, include a very broad range of sources from solar sys…

The Centers of Early-Type Galaxies With HST. II. Empirical Models and Structural Parameters

Faber, S. M.; Dressler, A.; Byun, Y. -I. +6 more

We present a set of structural parameters for the central parts of 57 early-type galaxies observed with the Planetary Camera of the Hubble Space Telescope. These parameters are based on a new empirical law that successfully characterizes the centers of early-type galaxies. This empirical law assumes that the surface brightness profile is a combina…

Hubble Space Telescope Ultraviolet Images of Five Circumnuclear Star-Forming Rings

Filippenko, A. V.; Macchetto, F. D.; Ho, L. C. +5 more

We present UV (~2300 A) images, obtained with the Hubble Space Telescope (HST) Faint Object Camera, of the central 20" of five galaxies containing circumnuclear star-forming rings. The five galaxies are from a well- defined sample of 103 normal, nearby galaxies we have observed with HST. At the HST resolution (0.05"), the rings break up into discr…

Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram

Holtzman, J. A.; Faber, S. M.; Stetson, P. B. +9 more

We present a V-I color-magnitude diagram for a region 1' - 2' from the center of M32 based on Hubble Space Telescope WFPC2 images. The broad color-luminosity distribution of red giants shows that the stellar population comprises stars with a wide range in metallicity. This distribution cannot be explained by a spread in age. The blue side of the g…

Nuclei of Nearby Disk Galaxies.I.A Hubble Space Telescope Imaging Survey

Franx, Marijn; Illingworth, Garth D.; MacKenty, John W. +1 more

We present deconvolved images of the central regions of 20 nearby disk galaxies, obtained with the original Planetary Camera of the Hubble Space Telescope. The galaxies span a range in Hubble type from S0 to Sm. We have measured surface brightness profiles, and inverted these to estimate luminosity-density profiles. Surface brightness profiles in …

The Discovery of Young, Luminous, Compact Stellar Clusters in the Starburst Galaxy NGC 253

Watson, A. M.; Holtzman, J. A.; Stapelfeldt, K. R. +14 more

We report the discovery of four young, luminous, compact stellar clusters in the central region of the starburst spiral galaxy NGC 253. One cluster has an intrinsic M_V_ of about -15 or brighter, an inferred mass in excess of 1.5 x 10^6^ M_sun_, assuming a Salpeter IMF from 0.08 M_sun_ to 100 M_sun_, and is resolved with a half-light radius of abo…

Astrometric Analysis of the Homunculus of eta Carinae With the Hubble Space Telescope

Currie, Douglas G.; Lynds, Roger; Groth, Edward J. +6 more

Images of η Carinae, obtained with the HST Wide Field/Planetary Camera in 1990 October (WFl), 1991 April (PC 1), and 1992 December (WF2) have been used to perform a detailed study of the proper motion of the homunculus of η Carinae. This analysis yields the plane-of-the-sky astrometric velocities which range from tens of kilometers per second to o…

On the Morphology of the HST Faint Galaxies

Giavalisco, Mauro; Livio, Mario; Bohlin, Ralph C. +2 more

Deep imaging with the Hubble Space Telescope (HST) has revealed a population of rapidly evolving galaxies, which account for < 50% of the total counts at I <~ 22.5, are well distinct from the passively evolving normal ellipticals and spirals, and have morphologies that elude the traditional Hubble classification scheme. This classification h…