... The concerns here are similar to those for observing bright targets; saturation and blooming of the bright companion PSF must not impact the faint target. Also, one may need to consider subtracting the PSF of the bright object, and effects which limit the accuracy of that subtraction. If the bright companion will saturate and bloom, it will be necessary to rotate the CCD so that blooming along the CCD columns does not obliterate the faint target. ...

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• Stellar Photometry
• WFPC2 Instrument Handbook Update
• Near Infrared Camera and Multi-Object Spectrometer Instrument Handbook for

... According to the most popular cosmological paradigm, the greater part of the galaxy mass is accumulated in the dark matter halo. ... The polar ring galaxies (PRGs) reveal external rings or disks of gas, dust and stars rotating in a plane roughly perpendicular to the disk of the central galaxy. ... The shape of the dark halo in the model was chosen so as to achieve the best fit to the observed rotation of both galaxies themselves and their polar rings. ... The SPRC-7 galaxy. ...

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• Detection of unique bright radio flare of X-ray binary

True Color Image Gallery: Galactic SNR | Magellanic Cloud SNR . ... Distance: 50kpc(distance to LMC, Westerlund(1990) ) . ... Radio Images Page . ... Exposure uf . ... Exposure uf Exposure time of unfiltered event file . Exposure f Exposure time of filtered event file . ... Event 2 FITS File . ... AUX file . ... N H = 0.5(10 22 cm -2 ) Assumed distance: 50kpc (distance to LMC, Westerlund(1990) ) . see fit detail page for more about the fit. see chandra spectrum page for region used. ...

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• Chandra Images for SNR J0535.4-6916
• Chandra Images for J0454.4-6713
• Chandra Images for G074.0-08.5NE

... Science Users Information > Observing with ESO Telescopes > Phase 2 Preparation > Observing conditions . ... Service Mode Philosophy . ... The following definitions of the observing conditions are common between Phase 1 preparation and Phase 2 preparation, as well as between Service Mode and Visitor Mode observations. ... There are additional Service Mode Policies and Service Mode Guidelines regarding the observing conditions. ... Seeing (Phase 1) and Image quality (Phase2) constraints . ... Moon . ...

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• ESO - Newsletter December 2015
• FORS1 Photometric System Characterization
• ESO - Science Announcements

CHIANTI - an atomic database for emission lines. ... K.P.Dere, E.Landi, H.E.Mason, B.C.Monsignori-Fossi, P.R.Young, 1997, A , 125, 149 . Article: Available from ADS . The Arcetri Spectral Code for thin plasmas . E.Landi M.Landini 1998, A , 133, 1 . ... E.Landi, M.Landini K.P.Dere, P.R.Young, H.E.Mason, 1999, A , 135, 339 . ... K.P.Dere, E.Landi, P.R.Young, G.Del Zanna, 2001, ApJS, 134, 331 . ... G.Del Zanna, B.J.I.Bromage, E.Landi, M.Landini, 2001, A , 379, 708 . ...

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• Clumpy dust disks
• Procedures for Observations
• Observing capabilities

... Usually, H I is seen as bright emission against a darker background, but under the right viewing conditions, it can also be seen as dark absorption against a brighter background. In the case where the background is itself H I emission, the hydrogen is said to be self-absorbed, and the radiative transfer process is termed H I self-absorption (HISA). ... Shown below is a single CGPS H I 21cm spectral line channel at a radial velocity of -41 km/s in the Local Standard of Rest, at l =140њ, b =+1њ. ...

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• CIMA Auto-Observing
• The CIMA Observing Modes
• I-GALFA View of a Galactic Tangent Region

... Neutral hydrogen is the best tracer of accreting and outflowing gas, however very hard to detect due to its low column density. ... Simulations predict that in order to detect HI in the extended environment of galaxies, brightness sensitivities well below NHI ~1018 cm-2 are required (e.g. Popping et al. ... Direct aims of the projects include: - Achieve a 1 sigma NHI of 2.5x1017 cm-2 over 20 km/s. - Measure the extended gas content of galaxies to detect gas accretion and outflows. ...

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• PhD Thesis (summary)
• HI-IRAS comparisons at 12 arcmin scales
• The Circinus Galaxy

Peremennye Zvezdy", . ... GSC 4232-02515, NSVS 3147658, NSVS 3174760 . ... 14.2-14.9 (R, NSVS); . ... During observations of a secondary eclipse of GSC 04232-02830 (Goranskij et al., 2005) on August 8, 2007, we identified GSC 4232-02515 as a W UMa eclipsing binary. ... VAST software was used for aperture photometry. ... This method produces a light curve with an arbitrary zero point. ... Light Curve . Light curve of GSC 4232-02515 in NSVS magnitude scale. ... gsc423202515_kadar_nsvs.dat . ...

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• XWare > APOD

... Many large telescopes will be available on Earth with which to observe the phenomena associated with the Shoemaker-Levy 9 impacts on Jupiter in visible, infrared, and radio wavelengths. ... The impact site of the fragments of Comet Shoemaker-Levy 9 on Jupiter. ... Better knowledge of the effects of Comet Shoemaker-Levy 9 on Jupiter may allow scientists to predict more accurately just how serious could be the results of future impacts of various-sized bodies on Earth. ... 87,500,000,000 . ... 320,000...

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• ASP: A Taste of Real Astronomy ? The ESA/ESO Astronomy Exercises
• ASP: Star Science in the Autumn Sky
• ASP: Mercury Summer 2011

... The Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands has been used to survey a section of the galactic plane at a radio frequency of 327MHz. ... Intensity data from the seperate epochs were combined, and the resulting images mosaiced to produce a single image of the entire survey region. ... The WSRT 327 MHz Galactic Plane Discrete Source Catalogue . ... It is available as a unix compressed Postscript file [164 Kbytes] and an ASCII text file [339 Kbytes]. ... Postscript [160 Kbytes] . ...

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• Doppler Shift
• Emission-line galaxies
• The SNR X-rays Catalog

The Sun is our nearest star and the source of energy for life on Earth. ... For centuries astronomers wondered whether they were clouds floating in the Sun's atmosphere, but we now know that they really are huge regions of magnetic field, about as intense as the field at the poles of an iron magnet. ... Such abrupt events were named solar flares , and what made them especially interesting was that occasionally, after a prominent flare, a magnetic storm would erupt on Earth. ...

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• The Acceleration of the Aurora
• Parallax
• Close-up of the Aurora

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Three sixth-form students from St Patrick's Grammar School, Armagh , used the Faulkes Telescope South in Australia in April to observe and measure HW Virginis , an unusual "binary" or double star system suspected to host one or