... 2000 August 19 . ROSAT Explores The X-Ray Sky . ... Explanation: Launched in 1990, the orbiting ROSAT observatory explored the Universe by viewing the entire sky in x-rays -- photons with about 1,000 times more energy than visible light. This ROSAT survey produced the sharpest, most sensitive image of the x-ray sky to date. The all-sky image is shown with the plane of our Milky Way Galaxy running horizontally through the center. ... About APOD | ...

... ROSAT Explores The X-Ray Sky . ... Credit: S. Digel and S. Snowden ( USRA / LHEA / GSFC ), ROSAT Project , MPE, NASA Explanation: Launched in 1990, the orbiting ROSAT observatory explored the Universe by viewing the entire sky in x-rays -- photons with about 1,000 times more energy than visible light. ... The all-sky image is shown with the plane of our Milky Way Galaxy running horizontally through the center. ... Over large areas of the sky a general diffuse background of x-rays dominates. ...

SAS home . SAS Watchout items . ... This thread contains a step-by-step recipe to extract a light curve of a point-like source for all the X-ray cameras, subtracting the background and correcting for exposure loses. ... The SAS task barycen performs this correction. ... If the following files are available: a) RGS event list; b) RGS source list, a call to the task performing light curve extraction, correction and background subtraction rgslccorr allows a user to create the light curve. ...

... October 8, 1996 . ROSAT Explores the X-Ray Sky . ... Explanation: Launched in 1990, the orbiting ROSAT observatory explored the Universe by viewing the entire sky in x-rays - photons with about 1,000 times more energy than visible light . This ROSAT survey produced the sharpest, most sensitive image of the x-ray sky to date. The all-sky image is shown with the plane of our Milky Way Galaxy running horizontally through the center. ... About APOD | ...

... champ name : Source ID in the format explained in the Definitions section. ra : RA in decimal degrees. ... pos_error : Source count extraction radius in arcseconds. netB : net counts in B-band. See Definitions section. error_netB : error of net counts in B-band. see Definitions section. netS : S-band net counts, defined analogously to netB . ... See Definitions section. C21 : X-ray color. ... C32 : X-ray color. See Definitions section. rateB : B-band count rate in ksec. ...

... RSDC . ... Press Releases (rus) || in Russian RSDC Quick Jump 9-year Galactic survey Catalog of sources 7-year Galactic Bulge Map Cleaning IBIS/ISGRI sky images IBIS/ISGRI Sensitivity vs. ... The INTEGRAL view of the Galaxy . ... May 2012: 9-year Galactic plane survey . ... They are ISGRI (higher plane detector of the IBIS telescope), JMX1 and JMX2 - two detectors of the JEM-X telescope. ... RSDC is actively participating in the all-sky survey carrying out with INTEGRAL observatory. ... 2016 IKI RAN...

... More information on books, telescopes, clubs, etc. is available in the Getting Started section. ... For more information call 617-495-7461. Boston University Astronomy Department - Public telescopic observing is held every clear Wednesday night. ... Boston Museum of Science - For more information and admission prices call 617-723-2500. ... For information and admission prices call 508-929-2700. ... Springfield Telescope Makers , VT. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

In version 2 of the data reduction, we include frames where there is some visible scattered light, but where the background is still reasonably low (not more than a few times the minimum background). ... Briefly, the scattered light subtraction was done by registering the bright and dark images, subtracting the dark from the bright to remove the source, smoothing to remove any residual sources left over after the subtraction, and subtracting this smoothed sky image from the bright frame. ...

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... SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . ... Accidental Astrophysics: The Devil's In the Magnitudes, Part II . ... The star second to the Sun in brilliance is Sirius. ... Recall the magnitude system, passed down to us through a hundred generations of sky watchers, as a means of quantifying stellar brightness ("Accidental Astrophysics," May/June, p. 9). ... Yes, it is a magnitude difference, but that difference is due to the distance between us and the star. ...

... J/ApJS/117/319 Northern RASS X-ray sources catalog (Appenzeller+ 1998) ================================================================================ Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. ... Redshift for extragalactic sources 115-119 F5.2 mag Vmag ? ... Note (2): Net X-ray source count rate as derived after superposition of all ROSAT scan stripes and correction for vignetting and dead time. ...

NMW survey overview . Access image archive . ... The New Milky Way survey aims to detect bright (V<13.5) optical transients near the Galactic plane using an automated wide-field (8x6 deg.) system capable of surveying the whole Milky Way area visible from the observing site in one night. ... All images obtained during the transient search survey are available online (please use the image archive access form ). ... Images per field: . ... Images per night: . ... Milky Way imaging time: . ...

... Luminosity (L) · · · · A source's luminosity is the power that it emits in radiation. ... NB Astronomers often say `flux' when they mean `flux density' · SI units are Wm-2Hz -1 -26 filter · Also used are Jy 10 Wm-2Hz -1 E= РРРF d dA dt Specific Intensity, Surface Brightness (I) · Specific intensity (or surface brightness) is the power received (or emitted) per unit area per unit frequency per unit solid angle. ч F at surface of a spherical source = I · · Specific intensity is independent of distance...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Australia Telescope Online Archive (ATOA) . ... Parkes | ... Australia Telescope 20GHz Survey . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... X-Ray Microlensing of Bright Quasars . ...

Links and Resources for Energy and the Environment . The world is finally becoming globally aware that exponential resource usage in combination with finite reserves is a recipe that ensures our great grandchildren won't be born. ... National Environmental Information Service . ... Electronic Energy Journal . ... Sustainable Development Dimensions , including sections on Environmental information , Environmental policy, planning and management and Energy for development . ... Acid Rain Resource . ...

This all-sky image, constructed from 2 years of observations by NASA's Fermi Gamma-ray Space Telescope, shows how the sky appears at energies greater than 1 billion electron volts (1 GeV). Brighter colors indicate brighter gamma-ray sources. ... A diffuse glow fills the sky and is brightest along the plane of our galaxy (middle). Discrete gamma-ray sources include pulsars and supernova remnants within our galaxy as well as distant galaxies powered by supermassive black holes. ...

... This paper describes the main algorithms used by the Einstein Level One processing to create the exposure masks and the background maps for Einstein IPC images, and how these algorithms were recreated in the IRAF environment. Our goal was to recreate the algorithms used by the Level One Processing to create exposure masks and background maps for Einstein Image Proportional Counter (IPC) data (cf. sections 2.5 and 2.7 of Harnden et al. ...

Measurement of Sky Brightness at the Iranian National Observatory Davoud Afshari1 and Sadollah Nasiri1,2 1Physics Department, Zanjan University, Zanjan 45195-313, Iran; Institute for Advanced studies in Basic Science (IASBS), Zanjan 45195-1159, Iran; Measurement of light pollution 2 Introduction Among 34 candidate sites at the central part of the country, 5 sites namely Garkesh (in Kashan ), Kolahbarfi(in Kashan ), Deynava (in ... One of these is light pollution. ...

... The visible power a source emits in all directions is measured in lumens. ... Solid Angle- . ... The solid angle of a light cone is the projected area of the cone divided by the total surface area of the sphere. A solid angle is measured in steradians, where 1 steradian corresponds to the solid angle su btended by a cone of unit slant height and unit projected area. ... Luminous intensity is the flow of luminous energy, or lumens, per steradian. ... This is the rate of flow (lumens) per unit area. ...

I was wondering what conditions should be met to have the "darkest" sky .. ... Upon the above publication of the Southern Galactic hemisphere, TunГ Tezel started seeking opportunities to create the Northern counterpart image. ... So, the initial quest of having the darkest possible sky have delivered us these two all-sky images of the two galactic hemispheres as seen from Planet Earth. Zoomable and 'full-screenable' fisheye view of the "darkest sky" Southern Galactic Hemisphere image. ...