... Flux density at 1 GHz (/Jy): 140 . ... Optical: Large ring, near Rosette nebula. X-ray: Possibly detected. ... Parkes 64-m at 2.7 GHz (9'). ADS . ... NRAO 300-ft at 2.7 GHz (5'), part only. ... Deep optical plates. ... Effelsberg 100-m at 2.7 GHz (4'.4: S=97.6?12.5 Jy), plus review of flux densities. ... 1985, ApJ, 292, 29. ... Einstein observations. ... 1996, ApJ, 461, 820. ... 1997, ApJ, 484, L129. -ray detection. ... Casandjian & Grenier 2008, A&A, 489, 849. -ray observations. ...

Photon Scattering: Basic Principle of Photon Scattering . Audio Narration is available . No Scattering: Photon Source and Detector . ... For optical photons, scattering goes as wavelength to the -4 power. In the case of blue photons compared to red photons, this means that blue photons are about 10 times more likely to get scattered than red photons. ... Watch the blue photons scatter away from the detector . ... Interstellar dust make stars appear redder than they really are . ...

... 349Stickel+ III/175 Optical spectroscopy of radio sources (Stickel+, 1989-94) ================================================================================ Optical spectroscopy of 1Jy, S4 and S5 radio source identifications STICKEL M., KUEHR H., FRIED J.W. " sign for lower redshift limit 14- 18 F5.3 --- z []? ... Of the 54 radio sources with previously published identifications, 50 optical counterparts have been confirmed while for 4 sources new identifications are proposed. ...

This is the homepage of Andrew Fruchter, an astronomer on the staff of the Space Telescope Science Institute . ... Here you can look at an HST images of the optical counterparts of gamma-ray bursts and their host galaxies. ... Therefore, substantial information on the fine scale structure of objects can be obtained by offsetting the pointing of the telescope between exposures and then combining these "dithered" exposures into a single image. ...

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The Secret Inner Life of the Orion Nebula . ... Beneath the familiar surface of the Orion Nebula is a spectacular molecular hydrogen outflow from a young stellar object, of very unusual morphology. ... The Orion Nebula . ...

... The latter will also help scientists construct a three-dimensional map of the nebula and should answer some questions about how it is interacting with the Pleiades cluster. Already Gibson and collaborators Kenneth Nordsieck of UW-Madison and Mark Holdaway of the National Radio Astronomy Observatory have added substantial evidence to the theory that the dust and gas the Pleiades nebula is composed of does not come from the famous cluster of stars that gives the nebula its name. ...

... X Rays from the Cats Eye Nebula . ... Credit: X-ray: NASA / CXC/ SAO ; Optical: NASA / STScI Explanation: Haunting patterns within planetary nebula NGC 6543 readily suggest its popular moniker -- the Cat's Eye nebula. ... This composite picture combines the latest Hubble optical image of the Cat's Eye with new x-ray data from the orbiting Chandra Observatory and reveals surprisingly intense x-ray emission indicating the presence of extremely hot gas. ... Cat s Eye Hubble Remix . ...

... 2008 August 4 . X-Rays from the Cat's Eye Nebula . ... This composite picture combines the latest Hubble optical image of the Cat's Eye with new x-ray data from the orbiting Chandra Observatory and reveals surprisingly intense x-ray emission indicating the presence of extremely hot gas. ... Other pockets of x-ray hot gas seem to be bordered by cooler gas emitting strongly at optical wavelengths, a clear indication that expanding hot gas is sculpting the visible Cat's Eye filaments and structures. ...

. [ Go back to Comet WWW site ] . Andrew A. Martis . martis @ sai.msu.ru .

... We suggest simple method of the selection of distant galaxies based on their radio properties. ... RC0015+0503a , RC0015+0503b , RC0015+0501 , RC0034+0513 , RC0038+0449 , RC0042+0504 . ... RC0105+0501 , RC0110+0500 , RC0117+0503 , RC0126+0502 , RC0133+0459 , RC0135+0450 , RC0137+0539 , RC0143+0505 , RC0152+0453 , RC0154+0459 , RC0159+0448 . ... RC0209+0501b , RC0213+0516 , RC0226+0512 , RC0250+0512 . ... RC0302+0456 , RC0308+0454 , RC0311+0507 , RC0318+0456 , RC0355+0449 . ...

... LABORATORY OF RADIO ASTRONOMICAL OBSERVATIONS . Radio sources identification is one of the most important tasks of the current radio astrophysics. ... Optical idetification. ... Optical identifications of subsample of steep spectra radio sources from RC catalog using 6m SAO telescope of SAO RAS: optical observations. ... Astronomy Reports. ... Identification of radio sources with data of various radio catalogs allows one to construct continual spectrum of the object and its radio structure. ...

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

... Based on the accurate radio position, GT 0236+610 was identified with LSI+61 303 (Gregory et al. , 1979[ 59 ]), a B0 star at a distance of 2 kpc (Frail and Hjellming, 1991[ 52 ]) with unusually broad, double-peaked, and variable and emission lines. ... The star wind velocity is estimated as  km s (Howarth, 1983[ 67 ]). ... The radio emission from LSI+61 303 exhibits non-thermal periodic outbursts of variable amplitude with a period of days (Taylor and Gregory, 1982, 1984[ 188 , 189 ]; Coe et al. ...

GALAXIES cenA .tiff 40 Bright Radio Galaxy M31.tiff Nikon Andromeda Galaxy (note HII regions in spiral arms) ngc6744.tiff 40 NGC 6744 a face-on spiral clouds_20d.tiff H'blad The Magellanic Clouds our nearest neighbours Lmc_7.tiff Nikon The Large Magellanic Clouds Lmc_zoom.tiff Nikon Detail of previous image smc_7.tiff Nikon The Small Magellanic Clouds smc-zoom.tiff Nikon Detail of previous image 30dor_40_BVR.tiff 40 The 30 Dor ... B [OIII] Halpha trifid.tiff 40" The Trifid Nebula. ...

... Radio searches for pulsars associated with supernova remnants. ... The Bologna submillisecond pulsar survey. ... A search for pulsar wind nebulae using pulsar gating. ... Anomalous pulsars and other radio quiet neutron stars in supernova remnants. ... A 16 ms X-ray pulsar in the Crab-like SNR N157B: fast times at 30 Doradus. ... Radio-quiet X-ray pulsars in SNRs and the ``missing'' pulsar problem. ... Searching for X-ray pulsars associated to SNRs in public ROSAT observations. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Product Reviews . ... Behemoth black hole found in an unlikely place . ... galaxies . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... A radio-optical view of the galaxy Hercules A . ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

On the problem of using of the ICRF radio coordinates reference system Lipovka A.A. (1), Lipovka N.M. (1) Center of research for physics, Sonora State University e-mail: nila_lip@mail.ru Bibliography 1. ... Columns 8, 9 are corrections to right ascension and declination, which should be added to coordinates of ICRF2 radio sources, to obtain coordinates of optical objects, with which these radio sources are identified. ... Lipovka .. ... Fig 3 Fig 3 ...

True Color Image Gallery: Galactic SNR | Magellanic Cloud SNR . ... Distance: 50kpc(distance to LMC, Westerlund(1990) ) . ... Radio . ... Radio Images Page . ... Exposure uf . ... Exposure uf Exposure time of unfiltered event file . Exposure f Exposure time of filtered event file . ... SNR is 2' off-axis . ... Event 2 FITS File . ... AUX file . ... Background from region west of SNR. see fit detail page for more about the fit. see chandra spectrum page for region used. ... Radio Images . ...

... Science . ... Science Users Information > Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Dust in the Crab Nebula Supernova Remnant . ... Data Handling and Products . ... Science Data Products Forum . ... The Crab Nebula supernova remnant, NGC 1952, is the remains of a massive star that underwent a supernova explosion in AD 1054 (see the HST image ). ... A thesis topic to study in detail the properties of the dust features in the Crab Nebula is outlined. ...