... A Beautiful Trifid . ... A star forming region in the plane of our galaxy, the Trifid fittingly illustrates three basic types of astronomical nebulae; red emission nebulae dominated by light from hydrogen atoms, blue reflection nebulae produced by dust reflecting starlight, and dark absorption nebulae where dense dust clouds appear in silhouette. ... Publications with keywords: M20 - star formation - emission nebula - reflection nebula - dark nebula - Trifid nebula . ... Emission Nebula IC 1396 . ...

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• The Beautiful Trifid
• Horsehead and Orion Nebulae

There is often dust associated with ionized regions. Compact HII regions usually have associated dust from a molecular cloud in which the massive star is being "born". ... For such stars the dust is not produced by the star, and a variety of dust features are observed. The planetary nebulae also usually have associated dust from the previous stage of evolution where they were either carbon stars or M-type giants. ... The feature near 11.5 microns in the IC 418 spectrum may be due to SiC dust. ...

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• Infrared Imaging of the Large Magellanic Cloud Star-forming Region Henize 206
• Brandon's Research
• STScI Preprint #1276

... B. Vicini, A. Natta, A. Marconi, L. Testi, D. Hollenbach, B.T. Draine . 1998, A&A, in press . ... 1998, ApJ, in press . ... L. Testi, F. Palla, A. Natta . ... Francesco Palla . 1998, The Physics of Star Formation and Early Stellar Evolution, eds. C.J. Lada and N. Kylafis, in press . ... 1998, in "The Molecular Astrophysics of Stars and Galaxies - A Volume Honouring Alexander Dalgarno", edited by T. W. Hartquist and D. A. Williams, Oxford University Press, in press . ... Star Formation Group . ...

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• A collection of images

RA 5:33, Dec -5:25 ( Orion ) . Type: emission nebula . ... The Orion Nebula is easily visible with the naked eye as the middle star in Orion's "sword". In this image M 42 (NGC 1976) and M 43 (NGC 1982) appear as one large object. ... The HST images below show for the first time small regions that seem to be on the verge of collapsing into stars and perhaps planetary systems. ... Fabulous HST images from Doug Johnstone . Nice HST image of the Trapezium . NN 248k gif . ... David Malin) . ...

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• APOD Index - Nebulae: Emission Nebulae
• APOD: 2005 May 26 - A Beautiful Trifid
• APOD: 2011 May 13 - A Beautiful Trifid

... Here some data observed on the 6m telescope with IFP installed in the OLD focal reducer are presented. ... Mkn 3: velocity field . ... NGC 5252: [OIII] image . ... NGC 5252 was observed 23 Feb. 1998 in the [OIII]5007 emission line with CCD TK1024 as detector. ... We observed the ionized gas velocity fields of the spiral galaxies with two purpose. ... Restored velocity field of NGC 157 in the reference frame rotating with the pattern speed overlaid on the Ha image of the galaxy . ... NGC 4100 . ...

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• My publications
• Publication Search

... About ATNF overview . ... Australia Telescope Steering Committee . ... LMC H II Region Luminosities versus . Observed Ionizing Stars . ... These values are compared to the observed H II region luminosities, yielding an estimate for the mean fraction of H-ionizing photons that escape the local nebulae in this sample. We formally estimate that, overall, 0-51% of the ionizing radiation escapes the local H II regions and is available to ionize the warm, ionized medium in the LMC. ...

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• The giant HII region NGC 3603
• An investigation of the molecular clouds of the Carina HII region/molecular
• ATNF Colloquium

... Science Users Information > Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Planetary Nebulae and HII regions in the Elliptical Galaxy NGC 5128 . ... NGC 5128 is the closest example of a giant early type (elliptical or S0) galaxy. Although often dubbed as a peculiar elliptical galaxy since it has a dust lane with recent star formation and an active galactic nucleus, the majority of early type galaxies have similar structures as revealed by recent surveys. ...

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• The Rho Ophiuchi star formation region in the constellation of Ophiuchus | ESO
• The sky around the star formation region RCW 106 | ESO
• VST image of the star-forming region Messier 17 | ESO

Our publications in 2005 year S.A. Pustilnik (SAO), A.Y. Kniazev (ESO, SAO), A.G. Pramskij (SAO) . Astronomy and Astrophysics, Volume 443, Issue 1, November III 2005, pp.91-102 (11/2005) . ... Kniazev, Alexei Y.; Grebel, Eva K.; Pustilnik, Simon A.; Pramskij, A.G.; Zucker, D.B. The Astronomical Journal, Volume 130, Issue 4, pp. ... 10/2005) . Pustilnik, S. A. Astron. ... Kniazev, A.Y.; Pustilnik, S.A.; Grebel, E.K.; Lee, H.; Pramskij, A.G. VizieR On-line Data Catalog: J/ApJS/153/429. ...

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• The use of IRAS data to define H II regions
• Radio survey for new compact HII regions
• HII regions H109-line catalog

... The GALFA Continuum Transit Survey group ( GALFACTS ; PI: A. R. Taylor) has conducted several test observations and will begin an all-sky full-Stokes continuum survey later this year with the new P-ALFA spectrometer. ... Sample Perseus images of GALFA H I 21cm-line and full-Stokes continuum emission are shown below along with maps of molecular (CO) gas, thermal dust, and ionized gas optical emission for comparison. ... The GALFA H I emission appears to envelop the molecular cloud gas traced by CO. ...

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• The Tarantula Nebula
• I-GALFA View of a Galactic Tangent Region
• GALFACTS Team Ready

... GSAOI Home . ... Science . ... Deep imaging at J , H , and K is required to identify all stellar objects, brown dwarfs, and planetary mass objects in the central region of the Orion Nebula Cluster down to masses comparable to that of Jupiter. This is required to establish the initial mass function, i.e., the number of stars of each mass that have formed, in this region of intense massive star formation. ... The fields of the GSAOI detectors are shown as four green squares in each frame. ...

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• David Nicholls: CV and publications
• publications
• The Music of the Spheres

... Educational programs (Russian) . ... Pre-university education . ... Samara State Aerospace University About us Samara region . ... Samara . Samara (Сама?ра), called Kuybyshev (Ку?йбышев) from 1935 to 1990, is one of the largest cities in Russia. ... The 20th -century Russian writer Alexey Tolstoy lived in Samara, and there is a museum dedicated to his life and literary work. ... Among them is Samara State Aerospace University (SSAU), one of Russia s leading engineering and technical institutions. ...

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• The Government of Samara Region and SSAU will train personnel for aerospace
• Samara Region Governor supports Samara State Aerospace University (SSAU)
• Vladimir Iliykhin - Best Professor of the Region

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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Most current theories for magnetospheric emission can be grouped into polar cap, outer gap, and nebular models. These models, at least in some cases, need not be mutually exclusive; the Crab pulsar (among others), for example, shows clear evidence for pulsed emission from the magnetosphere and unpulsed emission from the surrounding nebula. ... This suggestion is strengthened by observation of a distinct soft emission component, consistent with the cooling scenario, from several of these pulsars. ...

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• The SAOimage Menu (options within SAOimage)
• A Region mask for a radial profile in concentric, elliptical annuli
• A box, to include extended emission

... Tonight's Sky . ... Star Atlas . ... stars . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... An anarchic region of star formation captured . ... RELATED TOPICS: STARS . The star formation region NGC 6559. ... The Danish 1.54-meter telescope located at the European Southern Observatory (ESO) La Silla Observatory in Chile has captured a striking image of NGC 6559, an object that showcases the anarchy that reigns when stars form inside an interstellar cloud. ...

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• Is emission nebula NGC 6334 a mini starburst region? | Astronomy.com
• Curious dark nebula seen as never before | Astronomy.com

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 . ...

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• Galaxy Gallery Page III
• The Galaxy Gallery: Messier Objects
• Fabry-Perot Images of Starburst Galaxies

Next: Public Understanding of Science, Up: Technical Research Summaries Previous: New Approaches to Risk . ... Michael Smith has been analysing new infrared data collected from 11 PPN and PN by Chris Davis (Joint Astronomy Centre, Hawaii) to search for clues as to how the objects evolve. ... Georgi Pavlovski studied the properties of supersonic turbulence in molecular clouds and its effect on the molecular cloud properties and their chemical evolution. ...

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• C. Refereed Journal Publications 2001
• Flare Dynamics
• Armagh Observatory

... This program was created for correlating chosen regions in the series of fts images. ... Chosen regions' . ... In this section the program counts the integral for each region of the grid for each image. ... As a matter of fact, the integral is total brightness of the region and it is counted by 'int_tabulated' IDL function. ... In addition, the program will show the count of the regions which correlate with the corresponding region (the brighter region means the bigger count) and its contour. ...

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• Caving
• Scientific activity
• List of publications

... Circumstellar disc of beta Pictoris: constraints on grain properties from polarization. To appear in the Astronomy & Astrophysics . abs , src , ps ] . ... Dust influx to Titan from Hyperion . ... abs ] . ... Characteristics of bulges and disks in interacting galaxies . ... Dust grains around Herbig Ae/Be stars: porous, cometary-like grains? ... To appear in the Astronomy & Astrophysics Supplement . ... Finally, Links may lead you to more options (e.g. via the LANL preprint system). ...

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• List of publications
• Chemical evolution of galaxies: list of publications

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Telescopes and Observatories . ... The majestic star-forming region in the Lagoon Nebula. The pale ring to the right is an internal reflection in the telescope.€а (Image credit: ESO/ VPHAS+/ V. Kalari and J. Vink (Armagh Observatory) . ... The 18 component images were further processed twice. ... Venu and his colleagues use images like this to identify individual young forming stars in the Lagoon Nebula and determine their ages. ...

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• M78 off Orion: Bladerunner Nebula? | Astronotes
• What is a nebula? | Astronotes
• Tarantula Nebula in stunning Hubble Image | Astronotes

... region (region-7.9) [xmmsas_20060628_1801-7.0.0] . ... Local-background regions are in all cases annuli. ... Background regions of this shape should be chosen when there is no extended emission in the FOV, because OA-concentric regions are in general larger than source-concentric ones (thus offer better statisitics), yet sample everywhere approximately the same background level, because the value of the vignetting function is approximately the same at a given radius from the OA. fovbkgannulus =`no'....

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• Specifying source region shapes and sizes