On' failures in the NIRSpec MEMS ST-ECF Instrument Science Report NGST 2002-02 The effects of `on' failures in a MEMS array for the NGST NIRSpec Santiago Arribas, Robert Fosbury Peter Jakobsen --1-- ST-ECF Instrument Science Report NGST 2002-02 The effects of `on' failures in a MEMS array for the NGST ... Assuming that the spectrum of a single facet uses 2000 detector pixels, only 0.01% of `on' failures is acceptable (i.e., 400 facets in a 2k в 2K MEMS array). ...

... We measured these galaxies individually, and they are distinguished in our list by the suffixes a, b, c,... in order of increasing J2000 right ascension. ... The first column contains the UGC catalog number, to which we have added lower-case suffixes a, b, c,\dots in order of increasing J2000 right ascension to distinguish individual galaxies in groups. ... The third column lists the degrees, arcminutes, and arcseconds of J2000 declination plus the rms uncertainty in arcseconds. ...

... О Далекой Галактике . ... Теперь в Далекой Галактике вы всегда можете увидеть свежие фотографии Солнца. ... Форум . Форум "Далекой Галактики" - прекрасное место для общения всех астрономов. ... Новости из космоса . ... Подписаться на новости Далекой Галактики Вы можете здесь: . ... Новости из Далекой Галактики - популярно об Астрономии . ... Если вы хотите выразить свое мнение о сайте "Далекая Галактика", или просто почитать мнения других посетителей - пожалуйста, заходите в Гостевую книгу . ...

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Arecibo Galaxy Environment Survey (AGES) The M74 group is a gas-rich galaxy group located at roughly 10 Mpc and is similar in makeup to the Local Group. M74 dominates the surrounding region and is accompanied by several dwarf galaxies, some of which are star-forming. ... We have decided upon a drift mapping approach to scan the entire region. We have defined 5 constant declination scans 5 in length, separated by approximately one full ALFA footprint. ... START TIME (AST) . END TIME (AST) . ...

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... APOD: 2008 January 2- A Galaxy is not a Comet . ... Credit: Emiel Kempen Explanation: This gorgeous galaxy and comet portrait was recorded on December 30th, in the skies over Hoogeveen, The Netherlands. The combined series of 60 x 60 second exposures finds the lovely green coma of Comet 8P/Tuttle near its predicted conjunction with the Triangulum Galaxy . Aligning each exposure with the stars shows the comet as a streak, slowly moving against the background stars and galaxy. ... January 2008 . ...

... 2008 January 2 . A Galaxy is not a Comet . ... Explanation: This gorgeous galaxy and comet portrait was recorded on December 30th, in the skies over Hoogeveen, The Netherlands. The combined series of 60 x 60 second exposures finds the lovely green coma of Comet 8P/Tuttle near its predicted conjunction with the Triangulum Galaxy . Aligning each exposure with the stars shows the comet as a streak, slowly moving against the background stars and galaxy. ... About APOD | ...

The Australia Telescope Compact Array (ATCA) . Home page Team Galaxy Sample Observations Papers Projects Related Surveys Pipeline Meetings . Local Volume galaxies ( B. Koribalski) . The Local Volume HI Survey'' (LVHIS) is a project comprising deep HI line and 20-cm radio continuum observations for all nearby, gas-rich galaxies, supplemented by multi-wavelength data. ... Our aim is to study the formation and evolution of galaxies in the Local Universe. ...

Milky Way X-ray background emission « »: , . ... RXTE , . ... Using near-infrared Galaxy intensity measured with COBE/DIRBE experiment and X-ray data from RXTE and INTEGRAL it was shown that X-ray brightness of the Galactic background emission closely follows its stellar density and can be explained by a cumulative emission of a large number of weak Galactic X-ray sources. ... Map of Galactic background emission in hard X-ray energy band obtained with INTEGRAL observatory. ... 2006, &, 452, 169 ., ...

... MATERIAL: astronomical data visualization software like ds9 , IRAF, and the two galaxy images in the V-band and I-band . ... You received images in the V and I-band of an unknown, partially resolved Milky Way dwarf satellite galaxy. Your task is to generate a color-magnitude diagram (CMD) of this stellar system, find out what kind of stellar population it is made of (old, young?) and estimate its distance from the sun using well-known features identified in the CMD. ...

... We present a photometric and spectroscopic study of the unique isolated nearby galaxy KKR25. The isolated dwarf spheroidal (dSph) galaxy KKR25 was discovered by Karachentseva, Karachentsev Richter (1999, A , 135, 221) during the search of dwarf galaxies in the direction of the Local Void. In spite of its isolation KKR 25 has no gas and looks like a normal dwarf spheroidal system. ... This is the first known planetary nebula in a dwarf spheroidal galaxy outside the Local Group. ...

... These Frontier Fields will combine the power of HST with the natural gravitational telescopes of high-magnification clusters of galaxies. ... We are soliciting gravitational lensing maps for the last four Hubble Frontier Fields clusters (MACSJ0717.5+3745, MACSJ1149.5+2223, AbellS1063, and Abell 370) based upon the exceptionally deep HST FF imaging and other new ancillary data. ... For the full set of proposal instructions and requirements, see the FY16 Frontier Fields Lensing Map Call for Proposals....

. Hubble Space Telescope images of five of the newly identified UCDs and a normal dwarf galaxy (dEN) are shown along with their positions in the Fornax galaxy cluster. The positions of the two UCDs not pictured are also shown. Michael Hilker; Background: Arna Karick (Univ. of Melbourne), Curtis Schmidt Telescope; Insets: HST

... General information . ... Staff . ... Galaxies, AGN, Cosmology . ... SECCO1: an "almost-dark" dwarf galaxy . Models of galaxy formation and evolution within the Ю?-CDM paradigm can be tested against their predictions on the number and properties of dwarf galaxies and in particular stellar systems highly dominated by dark matter. ... The authors argue that the third possibility is the most likely one and hence SECCO1 would be a new faint dwarf galaxy residing in the Virgo cluster of galaxies. ...

... Posts tagged ?host galaxy? ... Without an optical afterglow, a galaxy within the 2 arc second error region of a GRB x-ray afterglow is identified as a host galaxy; however confusion can rise due to the facts that 1. the edge of a galaxy is diffused, 2. multiple sources could exist within 2 arc second error region, 3.the distance between the galaxy and the x-ray afterglow is measured by projection, and 4. lensing causes increase of brightness and position shifts. ... ArXiv] GRB host galaxies, Aug. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Our Galaxy . ... This greedy giant galaxy is hungry for more! (image credit:ESO) . Elliptical galaxy ESO 306-17 looks rather pretty in this Hubble Space Telescope image (count how many other galaxies there are in the background!) However beautiful though it may be, this galaxy could be a ravenous cannibal! ESO 306-17 is isolated in the intergalactic void possibly because it has swallowed up all its smaller neighbouring galaxies. ...

... In LABORATORY OF RADIO ASTROPHYSICS OF SPECIAL ASTROPHYSICAL OBSERVATORY OF RAS . ... History . ... Current problems of the group research interests: . study for cosmic microwave background, . study of radio galaxies (identification, evolution, statistical investigation of population), . investigation of the RATAN-600 antenna, . observations in the survey mode with RATAN-600 and their analysis, . creation of the software for data analysis. vo @ sao.ru ( Oleg Verkhodanov ) ...

... The search for distant objects which can be both galaxies and quasars is one of the most important problems of observational astrphysics, because it allows one to determine cosmological parameters connected with the time of appearence and evolution of stellar systems, large scale structure of the Universe. ... Radio galaxies are important objects to be studied because they are sources of infrared-optical-ultraviolet continuum, emission lines and continual radio emission. ...

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The Sun Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic Evolution ... So far, one planet has been studied by this method. ...