%...Journal: PASP %R=BibCode %A=Authors %B=Abstract %c=Copyright %D=Date of publication %E=Electronic file %F=Original File %I=Institute and/or Footnotes %J-last page %K=Keywords %T=Title %R 1999PASP..111..657V %F ori/PASPv111n760 %J-660 %T The Early History of Dark Matter. (Invited Review). %A van den Bergh, Sidney %I Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada; (sidney.vandenbergh@hia.nrc.ca) %B The history of the discovery of dark matter in the universe is briefly reviewed. Special emphasis is placed on the early work by Zwicky, Smith, Babcock, and Oort. %K Cosmology: Dark Matter %R 1999PASP..111..661S %F ori/PASPv111n760 %J-678 %T A Brief History of Active Galactic Nuclei. (Invited Review). %A Shields, Gregory A. %I Department of Astronomy, University of Texas, Austin, TX 78712; (shields@astro.as.utexas.edu) %B Astronomers knew early in the 20th century that some galaxies have emission-line nuclei. However, even the 1943 systematic study by Seyfert was not enough to launch active galactic nuclei (AGN) as a major topic of astronomy. The advances in radio astronomy in the 1950s revealed a new universe of energetic phenomena and inevitably led to the discovery of quasars. These discoveries demanded the attention of observers and theorists, and AGN have been a subject of intense effort ever since. Only a year after the recognition of the redshifts of 3C 273 and 3C 48 in 1963, the idea of energy production by accretion onto a black hole was advanced. However, acceptance of this idea came slowly, encouraged by the discovery of black hole X-ray sources in our Galaxy and, more recently, supermassive black holes in the center of the Milky Way and other galaxies. Many questions remain as to the formation and fueling of the hole, the geometry of the central regions, the detailed emission mechanisms, the production of jets, and other aspects. The study of AGN will remain a vigorous part of astronomy for the foreseeable future. %K Galaxies: Active %K Galaxies: Seyfert %K Galaxies: Quasars: General %R 1999PASP..111..679P %F ori/PASPv111n760 %J-684 %T Space Telescope Imaging Spectrograph Parallel Observations of the Planetary Nebula M94-20(1). (Research Note). %A Plait, Philip (2)(3) %A Gull, Theodore R. (3) %B The planetary nebula M94-20 in the Large Magellanic Cloud was serendipitously observed with the Space Telescope Imaging Spectrograph on board the {\em Hubble Space Telescope} as part of the {\em Hubble Space Telescope} Archival Pure Parallel Program. We present spatially resolved imaging and spectral data of the nebula and compare them with ground-based data, including detection of several emission lines from the nebula and the detection of the central star. We find that the total H{alpha}+[N {\sc ii}] flux is 7.3x10^-15^ ergs s^-1^.cm^-2^, and we estimate the magnitude of the central star to be m_V_=26.0+/-0.2. Many other H{alpha} sources have been found in M31, M33, and NGC 205 as well. We discuss the use of the parallel observations as a versatile tool for planetary nebula surveys and for other fields of astronomical research. %K Galaxies: Local Group %K Galaxies: Magellanic Clouds %K planetary nebulae: individual (\objS{[M94b] 20}{M94-20}) %I (1) Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under the NASA contract NAS 5-26555. %I (2) Advanced Computer Concepts, Inc., Potomac, MD 20854; (plait@abba.gsfc.nasa.gov). %I (3) Laboratory for Astronomy and Solar Physics, Code 681, Goddard Space Flight Center, Greenbelt, MD 20771; (gull@sea.gsfc.nasa.gov). %R 1999PASP..111..685H %F ori/PASPv111n760 %J-690 %T The HII Regions of M33. II. A Photometric Catalog of 1272 Newly Identified Emission Regions. %A Hodge, Paul W. %A Balsley, Jeff (1) %A Wyder, Ted K., %A Skelton, Brooke P. %I Astronomy Department, Box 351580, University of Washington, Seattle, WA 98195-1580; (hodge@astro.washington.edu), (jmb6r@virginia.edu), (wyder@astro.washington.edu), (skelton@astro.washington.edu) %B We have identified a total of 1272 newly recognized emission regions in M33. Combined with the previously cataloged total of 1066 H II regions and supernova remnants, this brings M33's total to 2338 emission regions. This paper provides photometry of the new objects in H{alpha}, which is combined with data from previous catalogs to produce a global H II region luminosity function (corrected for incompleteness) that reaches a faint luminosity limit of 2x10^34^ ergs.s^-1^ and shows a broad maximum with a peak frequency at luminosities of 6x10^35^ ergs.s^-1^. We also plot the H II region size distribution and comment on unusual morphologies. %K galaxies: individual (M33) %K Galaxies: ISM %K ISM: H II Regions %I (1) Current address: Astronomy Department, University of Virginia, Charlottesville, VA 22903. %R 1999PASP..111..691S %F ori/PASPv111n760 %J-701 %T The Detection and Photometric Redshift Determination of Distant Galaxies Using {\em SIRTF}'s Infrared Array Camera. %A Simpson, Chris (1) %A Eisenhardt, Peter %I Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 169-327, 4800 Oak Grove Drive, Pasadena, CA 91109; (chris@naoj.org) %B We investigate the ability of the {\em Space Infrared Telescope Facility}'s Infrared Array Camera to detect distant (z~3) galaxies and measure their photometric redshifts. Our analysis shows that changing the original long-wavelength filter specifications provides significant improvements in performance in this and other areas. %K Cosmology: Early Universe %K Galaxies: Evolution %K Infrared Radiation %K Instrumentation: Photometers %K Techniques: Photometric %I (1) Present address: Subaru Telescope, National Astronomical Observatory of Japan, 650 North A`oh{omacr}k{umacr} Place, Hilo, HI 96720. %R 1999PASP..111..702A %F ori/PASPv111n760 %J-708 %T The Parentage of Magnetic White Dwarfs: Implications from Their Space Motions. %A Anselowitz, Tara %A Wasatonic, Richard %A Matthews, Karen %A Sion, Edward M., %A McCook, George P. %I Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085; (emsion@ucis.vill.edu) %B We have examined the statistical properties, cooling ages, and vector components of the three-dimensional space motion {\em U, V, W} for the enlarged sample of 53 magnetic white dwarfs contained in the fourth edition of the Catalog of Spectroscopically Identified White Dwarfs (McCook & Sion). Their cooling ages range from 2 million years to 12.6 billion years. A comparison of the total kinematic samples of magnetics and DA stars over the same luminosity range 10.0