Radio waves [ http://www.aoc.nrao…], like visible light, are electromagnetic radiation [ http://imagine.gsfc…emspectrum.html ] and radio telescopes can “see” — their signals translate into radio images [ http://www.jb.man.a…] of the cosmos. While individually [ http://www.jb.man.a…] even the largest radio [ http://antwrp.gsfc.…] telescopes have very blurry vision compared to their optical counterparts [ http://www.seds.org…], networks of radio telescopes can combine signals to produce sharper pictures [ http://www.jive.nl/…]. In fact, using an NRAO [ http://www.nrao.edu…] supercomputer in New Mexico, USA and technique called VLBI [ http://lupus.gsfc.n…] (Very Long Baseline Interferometry), the European network of radio telescopes (EVN [ http://www.jive.nl/…]) has produced pictures of distant galaxies at a resolution some three times higher than the Hubble Space Telescope. Penetrating obscuring dust, the false-color EVN radio images [ http://www.jive.nl/…] are inset above according to their relative location in an optical image of the famous Hubble Deep Field [ http://antwrp.gsfc.…] region of the sky. (Yellow lines superimposed on the optical image are radio intensity contours from a single telescope.) The bright cosmic radio source in the middle of each inset corresponds to a galaxy. Impressively, the radio sources appear to be so small, less than about 600 light-years across in actual size, that they are thought to be associated [ http://xxx.lanl.gov…] with massive central black holes [ http://antwrp.gsfc.…] in the distant deep field galaxies.Â
Credit and Copyright:Â
M. Garrett [ mailto:garrett@jive. nl ] (JIVE [ http://www.jive.nl/]), T. Muxlow and S. Garrington (Jodrell Bank [ http://www.jb.man.a…]), EVN [ http://www.jive.nl/…]Â
keyword:Â
galaxiesÂ
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black holesÂ
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hubble deep fieldÂ
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radio telescopesÂ
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Goddard Space Flight Center (GSFC)Â
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Visible LightÂ
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LupusÂ
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Hubble Space Telescope (HST)Â
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Posts Tagged ‘space’
Distant Galaxies in Radio Vision
Saturday, April 24th, 2010Doradus Nebula
Saturday, April 24th, 2010
A panoramic view of a vast, sculpted area of gas and dust where thousands of stars are being born has been captured by NASA’s Hubble Space Telescope. The image, taken by Hubble’s Wide Field and Planetary Camera 2, is online at http://oposite.stsc…and http://www.jpl.nasa…. The camera was designed and built by NASA’s Jet Propulsion Laboratory, Pasadena, Calif. The photo offers an unprecedented, detailed view of the entire inner region of the fertile, star-forming 30 Doradus Nebula. The mosaic picture shows that ultraviolet radiation and high-speed material unleashed by the stars in the cluster, called R136 (the large blue blob left of center), are weaving a tapestry of creation and destruction, triggering the collapse of looming gas and dust clouds and forming pillar-like structures that incubate newborn stars. The 30 Doradus Nebula is in the Large Magellanic Cloud, a satellite galaxy of the Milky Way located 170,000 light-years from Earth. Nebulas like 30 Doradus are signposts of recent star birth. High-energy ultraviolet radiation from young, hot, massive stars in R136 causes surrounding gaseous material to glow. Previous Hubble telescope observations showed that R136 contains several dozen of the most massive stars known, each about 100 times the mass of the Sun and about 10 times as hot. These stellar behemoths formed about 2 million years ago. The stars in R136 produce intense “stellar winds,” streams of material traveling at several million miles an hour. These winds push the gas away from the cluster and compress the inner regions of the surrounding gas and dust clouds (seen in the image as the pinkish material). The intense pressure triggers the collapse of parts of the clouds, producing a new star formation around the central cluster. Most stars in the nursery are not visible because they are still encased in cocoons of gas and dust. This mosaic image of 30 Doradus consists of five overlapping pictures taken between January 1994 and September 2000 by the Wide Field and Planetary Camera 2. Several color filters enhance important details in the stars and the nebula. Blue corresponds to the hot stars. The greenish color denotes hot gas energized by the central cluster of stars. Pink depicts the glowing edges of the gas and dust clouds facing the cluster, which are being bombarded by winds and radiation. Reddish-brown represents the cooler surfaces of the clouds, which are not receiving direct radiation from the central cluster. Additional information about the Hubble Space Telescope is at http://www.stsci.edu. More information about the Wide Field and Planetary Camera 2 is at http://wfpc2.jpl.na…. The Space Telescope Science Institute, Baltimore, Md., manages space operations for Hubble for NASA’s Office of Space Science, Washington, D.C. The institute is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract with the Goddard Space FlightÂ
Description:Â
Center, Greenbelt, Md. The Hubble Space Telescope is a project of international cooperation between NASA and the European Space Agency. JPL is a division of the California Institute of Technology in Pasadena.Â
Date:Â
12.01.1999Â
Credit:Â
NASA Jet Propulsion Laboratory (NASA-JPL) [ http://photojournal…]Â
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Galaxy Group Hickson 44
Saturday, April 24th, 2010
Galaxies, like stars, frequently form groups. A group of galaxies [ http://www.seds.org…] is a system containing more than two galaxies but less than the tens or hundreds typically found in a cluster of galaxies [ http://antwrp.gsfc.…]. A most notable example is the Local Group of Galaxies [ http://www.ucolick.…], which houses over 30 galaxies [ http://seds.lpl.ari…] including our Milky Way [ http://antwrp.gsfc.…], Andromeda [ http://antwrp.gsfc.…], and the Magellanic Clouds [ http://antwrp.gsfc.…]. Pictured above is nearby compact group [ http://www.astro.ub…] Hickson 44. This group [ http://members.aol.…] is located about 60 million light-years [ http://www.wsanford…] away toward the constellation of Leo [ http://www.astro.wi…]. Also known as the NGC 3190 Group, Hickson 44 [ http://www.rc-astro…] contains several bright spiral [ http://www.seds.org…] galaxies and one bright elliptical [ http://www.seds.org…] galaxy on the upper left. The bright source on the upper right is a foreground star. Many galaxies in Hickson 44 [ http://www.skyhound…] and other compact groups [ http://en.wikipedia…] are either slowly merging or gravitationally pulling [ http://antwrp.gsfc.…] each other apart.Â
Credit and Copyright:Â
MASIL Imaging Team [ http://www.masil-as…]Â
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ArizonaÂ
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Goddard Space Flight Center (GSFC)Â
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AndromedaÂ
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LeoÂ
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SPD-APOD-ap070319Â
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Giant Emission Nebula NGC 3603 in Infrared
Saturday, April 24th, 2010
NGC 3603 is the largest region of glowing gas in our Milky Way galaxy [ http://adc.gsfc.nas…]. Spanning over 20 light years [ http://starchild.gs…] across, the giant emission nebula [ http://antwrp.gsfc.…] (HII region) is home to a massive star cluster [ http://antwrp.gsfc.…], thick dust pillars [ http://antwrp.gsfc.…], and a star about to explode [ http://antwrp.gsfc.…]. NGC 3603 was captured above in infrared light [ http://www.ipac.cal…] by a Two Micron All Sky Survey [ http://www.ipac.cal…] (2MASS) telescope. The young star cluster near the center heats the region’s mostly hydrogen [ http://pearl1.lanl.…] gas. Many stars in the cluster are estimated [ http://adsabs.harva…] to be about one million years old, much less than the five billion-year age of our Sun [ http://www.nineplan…]. NGC 3603 [ http://www.ipac.cal…] lies approximately 20,000 light years away toward the constellation [ http://www.astro.wi…] of Carina [ http://www.astronom…].Â
Credit and Copyright:Â
2MASS Project [ http://www.ipac.cal…], UMass [ http://pegasus.astr…], IPAC/Caltech [ http://www.ipac.cal…], NSF [ http://www.nsf.gov/], NASA [ http://www.nasa.gov/]Â
keyword:Â
infraredÂ
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NGC 3603Â
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Goddard Space Flight Center (GSFC)Â
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Washington, D.C.Â
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CarinaÂ
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PegasusÂ
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nebulaÂ
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emission nebulaÂ
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NGC 3603Â
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New General Catalogue (NGC)Â
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HD 189733b: Hot Jupiter
Saturday, April 24th, 2010
HD 189733b [ http://skytonight.c…3310756.html?page=1& c=y ] is a Jupiter-sized planet known [ http://exoplanet.eu…] to orbit a star some 63 light-years away. But while the distant world is approximately the size of Jupiter, its close-in orbit makes it much hotter than our solar system’s ruling gas giant. Like other detected hot Jupiters [ http://en.wikipedia…], its rotation is tidally locked — one side always faces its parent star as it orbits once every 2.2 days. Using infrared [ http://coolcosmos.i…] data from the Spitzer Space Telescope [ http://www.spitzer.…ssc2007-09/index.sht ml ], this planet’s temperature variations have been mapped out — the first map ever made [ http://www.spitzer.…ssc2007-09/ssc2007-0 9a.shtml ] for a planet beyond our solar system. Seen here (brighter colors = higher temperatures), the hottest spot on the planet is not at longitude 0.0, the point exactly facing the parent star. Instead, it’s about 30 degrees to the east (right), evidence that fierce, planet circling winds influence the temperature. In the planet-wide map [ http://arxiv.org/ab…], the temperature measurements vary from about 930 to 650 degrees C (1,700 to 1,200 F).Â
Credit and Copyright:Â
Heather Knutson (Harvard-Smithsonian CfA) et al. [ http://arxiv.org/ab…], NASA / JPL-Caltech [ http://www.spitzer.…]Â
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Spitzer Space TelescopeÂ
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Atmospheres Detected for Two Extrasolar Planets
Saturday, April 24th, 2010
Do extrasolar planets have water? In an attempt to find out, the orbiting Spitzer Space Telescope [ http://www.spitzer.…] made detailed observations of the atmospheres of two planets that orbit stars other than our Sun. Unfortunately, water vapor [ http://en.wikipedia…] was not detected in either exoplanet. Spitzer watched star systems HD 209458b [ http://en.wikipedia. org/wiki/Osiris_(pla net) ] and HD 189733b [ http://en.wikipedia…] closely in infrared light both before and after the parent stars eclipsed their known planets. By comparing eclipsed [ http://csep10.phys.…] and uneclipsed spectra very closely, astronomers could deduce bright light-emitting atmospheric gasses that were being blocked during eclipse. Were water vapor one of these atmospheric gases, a new indication that life [ http://www.astrobio…] might exist outside of our Solar System [ http://www.national…] would have been found. The planets being analyzed are known as hot Jupiters [ http://en.wikipedia…] — they have sizes close to Jupiter [ http://antwrp.gsfc.…] but orbits closer to the distance of Mercury [ http://antwrp.gsfc.…]. The above illustration [ http://www.spitzer.…] shows an artist’s depiction of one of these dry worlds. Although no water vapor was detected this time, the techniques of measuring exoplanet [ http://exoplanet.eu/] atmospheres are quite promising, and the search for distant water and other biomarkers [ http://planetquest.…] is just beginning.Â
Credit and Copyright:Â
NASA [ http://www.nasa.gov/]/JPL-Caltech [ http://jpl.nasa.gov/]/T. Pyle (SSC [ http://ssc.spitzer.…])Â
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1997 Hubble Fellows to Study HST Discoveries
Saturday, April 24th, 2010
Technical facts about this news release: Back to entire collection [ http://hubblesite.o…] Next release [ http://hubblesite.o…] Previous release [ http://hubblesite.o…]Â
note:Â
*Image Type:*: MiscellaneousÂ
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*Description*: Space Telescope Science Institute Logo.Â
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*Release Date*:March 19, 1997 12:00 AM (EST)Â
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*News Release Number:*: STScI-1997-06aÂ
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*Title*:1997 Hubble Fellows to Study HST DiscoveriesÂ
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MarsÂ
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Hubble Space Telescope (HST)Â
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March 19, 1997Â
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SPD-HUBBLE-STScI-199 7-06aÂ
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March 19, 1997 12:00 AM (EST)Â
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An Unexplored Nebula
Saturday, April 24th, 2010
The combined light of the stars of the Milky Way [ http://antwrp.gsfc.…] are reflected by this cosmic dust cloud that soars some 300 light-years above the plane of our Galaxy. Dubbed the Angel Nebula [ http://www.galaxyim…] by astronomer Steve Mandel’s 13 year old son, the dusty apparition is part of an expansive complex of dim and relatively unexplored diffuse nebulae, traced over [ http://www.galaxyim…] large regions seen toward the North and South Galactic poles [ http://www.anzwers.…]. Along with the blue tint characteristic of more commonly observed reflection [ http://antwrp.gsfc.…] nebulae, the Angel Nebula and other dusty galactic cirrus [ http://www.allthesk…] also produce a faint reddish [ http://antwrp.gsfc.…] luminescence, as dust grains [ http://arxiv.org/ab…] convert the Milky Way’s invisible [ http://adc.gsfc.nas…] ultraviolet radiation to visible red light. Spanning 3×4 degrees on the sky in the constellation Ursa Major, this wide-angle, high-resolution image was recorded as part of the Unexplored Nebula Project [ http://www.galaxyim…].Â
Credit and Copyright:Â
Steve Mandel, Galaxy Images [ http://www.galaxyim…]Â
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Ursa MajorÂ
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nebulaÂ
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SPD-APOD-ap050929Â
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106301Â
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Cone Nebula Close-Up
Saturday, April 24th, 2010
Cones, pillars [ http://antwrp.gsfc.…], and majestic flowing shapes [ http://www.goodeart…staltite.html ] abound in stellar nurseries [ http://archive.ncsa…] where natal clouds of gas and dust are buffeted by energetic winds from newborn stars. A well-known example, the Cone Nebula [ http://www.skyhound…] within the bright galactic star-forming region NGC 2264, was captured in this close-up view [ http://sites.stsci.…pr-photos.html#b ] from the Hubble Space Telescope’s newest camera [ http://www.ball.com…]. While the Cone Nebula [ http://antwrp.gsfc.…], about 2,500 light-years away in Monoceros [ http://www.hawastso…], is around 7 light-years long, the region pictured here surrounding the cone’s blunted head is a mere 2.5 light-years across. In our neck [ http://www.anzwers.…] of the galaxy that distance is just [ http://www.anzwers.…] over half way from the Sun to its nearest stellar neighbor, Alpha Centauri [ http://antwrp.gsfc.…]. The massive star NGC 2264 IRS [ http://oposite.stsc…], seen by Hubble’s infrared camera in 1997, is the likely source of the wind sculpting the Cone Nebula and lies off the top of the image. The Cone Nebula’s reddish veil is produced by [ http://csep10.phys.…absorption.html ] glowing hydrogen gas.Â
Credit and Copyright:Â
ACS Science & Engineering Team [ http://acs.pha.jhu.…], NASA [ http://www.nasa.gov/]Â
keyword:Â
star formationÂ
keyword:Â
hubble space telescopeÂ
keyword:Â
ngc 2264Â
keyword:Â
cone nebulaÂ
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MonocerosÂ
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1997Â
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Animation of Galaxy C153 Stripped of Hydrogen
Saturday, April 24th, 2010MPEG This animated artist’s concept shows how the “distressed” galaxy C153 is being stripped of hydrogen from its spiral arms.Â
Caption:Â
Credit: NASA/STScI/G.Bacon.Â
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SPD-CHAND-photo/2004 /c153/c153_hydrogen_ lg.movÂ
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