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Classification of Galaxies
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Title: A Revised Parallel-Sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies Authors: John Kormendy, Ralf Bender We update van den Bergh's parallel sequence galaxy classification in which S0 galaxies form a sequence S0a-S0b-S0c that pa...
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Dark Energy
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Cosmologists from Princeton University have proposed a new technique that will be able to determine if the cosmic acceleration (expansion of the universe) is due to a yet unknown form of Dark Energy in the universe or if it is a signature of a breakdown of Einstein's theory of Gener...
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Dwarf galaxies
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There is more than one way to make a dwarf galaxy, and NASA's Galaxy Evolution Explorer has found a new recipe. The spacecraft has, for the first time, identified dwarf galaxies forming out of nothing more than pristine gas likely leftover from the early universe. Dwarf galaxies are relatively smal...
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Massive galaxies
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A team led by an Indiana University astronomer has found a sample of massive galaxies with properties that suggest they may have formed relatively recently. This would run counter to the widely-held belief that massive, luminous galaxies (like our own Milky Way Galaxy) began their formation and e...
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Hubble Deep Field
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The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. Read more Spoiler The Hubble Ultra Deep Field in 3D [spoiler]...
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Gamma-Ray Bursts
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Long duration gamma-ray bursts (GRBs) seem to involve very massive stars. A new clue indicating this was uncovered recently by a series of ima...
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Hanny's Voorwer objects
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Hubble Finds Phantom Objects Near Dead Quasars NASA's Hubble Space Telescope has photographed a set of wispy, goblin-green objects that are the ephemeral ghosts of quasars that flickered to life and then faded. The ethereal wisps outside the host galaxy are believed to have been illuminated by po...
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Dwarf Galaxy IZw18
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Title: Dust in the Extremely Metal-Poor Blue Compact Dwarf Galaxy IZw18: The Spitzer Mid-Infrared View Authors: Yanling Wu, V.Charmandaris, L.K.Hunt, J.Bernard-Salas, B.R.Brandl, J.A.Marshall, Vianney Lebouteiller, J.R.Houck IZw18, a blue compact dwarf (BCD) galaxy with the 2nd lowest...
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Satellite Galaxies
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Title: The Orbital Distribution of Satellite Galaxies Authors: Stéphane Herbert-Fort, Dennis Zaritsky, Yeun Jin Kim, Jeremy Bailin, James E. Taylor We measure the distribution of velocities for prograde and retrograde satellite galaxies using a combination of published data and new observa...
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Sagittarius A East
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Title: A Candidate Neutron Star Associated with Galactic Center Supernova
Remnant Sagittarius A East
Authors: Sangwook Park (Penn State), Michael P. Muno (UCLA), Frederick K.
Baganoff (MIT), Yo****omo Maeda (ISAS), Mark Morris (UCLA), George Chartas
(Penn State)...
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NGC 4254
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Title: NGC 4254: An Act of Harassment Uncovered by the Arecibo Legacy Fast ALFA Survey Authors: Martha P. Haynes, Riccardo Giovanelli, Brian R. Kent We present an HI map constructed from the Arecibo Legacy Fast ALFA (ALFALFA) survey of the surroundings of the strongly asymmetric Virgo cluster Sc g...
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Local Group Galaxy IC 10
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Title: The Proper Motion of the Local Group Galaxy IC 10
Authors: A. Brunthaler (1), M.J. Reid (2), H. Falcke (3,4), C. Henkel (1), K.M. Menten (1) ((1) Max-Planck-Institut fuer Radioastronomie, (2) Harvard-Smithsonian Centre for Astrophysics, (3) ASTRON, (4) Universiteit N...
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CXOM31 J004205.77+411330.43
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Title: Chandra, XMM-Newton and HST observations of a transient in M31 with a possible asymmetric, precessing disk Author: R. Barnard, M. R. Garcia, S. S. Murray The transient X-ray source CXOM31 004205.77+411330.43 exhibited several outbursts during our long-term monitoring campaign of ~mon...
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Primordial black holes
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Title: Cosmological dinosaurs Authors: V. K. Dubrovich, S. I. Glazyrin The hypothesis of existence of primordial black holes with large masses (\geq 10^6 solar masses), formed at the earliest stages of the Universe evolution, is considered in the paper. The possibility does not contradict some...
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Cosmic precipitation
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NASA's Chandra Observatory Finds Cosmic Showers Halt Galaxy Growth Using NASA's Chandra X-ray Observatory, astronomers have found that the growth of galaxies containing supermassive black holes can be slowed down by a phenomenon referred to as cosmic precipitation. Cosmic precipitation is n...
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