... The spectrograph SP-124 at the Nasmyth-1 focus of the 6 m telescope with UAGS camera and Photometrix CCD PM1024 ( m pixel size) was used for the observations. ... Gratings with 300 and 600 grooves/mm were used, resulting in a spectral resolution of approximately 12 and 6 ? ... A He-Ne-Ar lamp was used for wavelength calibration. ... April 6.914 . ... The reduction of the original two-dimensional CCD data included the standard steps such as bias and dark subtraction, flat-fielding, cosmic-ray removal...

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• IPCS observations and data reduction
• A 20 cm VLA survey of Abell clusters of galaxies
• Data reduction

The Interacting Galaxy Pair NGC 6872 / IC 4970 - Observations Simulations by Horellou Koribalski . ... The atomic neutral hydrogen gas - as traced by the 21-cm HI line - is confined to the interacting galaxies NGC 6872 / IC 4970. ... Stars and Gas in the Very Large Interacting Galaxy NGC 6872 . ... Gas and Star Formation in the Interacting Galaxies NGC 6872/IC4970 . ... Stars and Gas in the Large Interacting Galaxy NGC 6872 . ... The Gigantic Interacting Galaxy NGC 6872 . ...

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• Galaxies in the Local Volume
• HI in NGC3263 / NGC3256
• CENTERS

HUBBLE SPACE TELESCOPE DAILY REPORT #2024 PERIOD COVERED: 0000Z (UTC) 12/15/97 - 0000Z (UTC) 12/16/97 Daily Status Report as of 350/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks) The WF/PC-2 was used to make a series of Cycle 7 standard dark calibration images. ... 1.3 Completed Four Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental Darks PT1/3) The WF/PC-2 was used to make supplemental dark calibration images. ...

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• http://www.stsci.edu/ftp/observing/status_reports/old_reports_93/hst_status_06_24_93
• http://www.stsci.edu/ftp/observing/status_reports/old_reports_97/hst_status_05_01_97
• http://www.stsci.edu/ftp/observing/status_reports/old_reports_99/hst_status_08_31_99

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. " The Arecibo Observatory is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations . expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."

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• STANDARDS OF REST & REDSHIFT CORRECTIONS
• Galaxy Shop National Astronomy and Ionosphere Center (Arecibo Observatory)
• The Evolution of Galaxies Seen Through The Neutral Hydrogen Line The Evolution

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

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• The Galaxy Gallery: Messier Objects
• Astronomy 123 Fall 1999
• Astro-2 and the UIT Experiment

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... Unexpected Galaxy String in the Early Universe . ... 20.01.2004 . ... NSF , NASA Explanation: How could such a long string of galaxies form so early in the universe? Several new measurements of galaxies and clusters in the early universe are reporting structures involving galaxies and clusters that are larger than expected with the new standard "dark-energy" cosmology . ... Publications with keywords: galaxies - early universe . Publications with words: galaxies - early universe . ...

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• The Diner at the Center of the Galaxy
• In the Center of Spiral Galaxy M83
• In the Center of Spiral Galaxy M61

... The sample of the Local Volume galaxies (distance smaller than 10 Mpc) gives a unique opportunity to study the properties of galaxies including the weakest objects: the absolute magnitude M B -10 and the virial mass M vir 10 9 M x263C;. ... Luminosity function of the Local Volume galaxies. ... The luminosity functions for galaxies are presented: red dashed line - from the 2dFGRS survey (Norberg et al. 2002); blue dash-dotted line - from the SDSS survey (Blanton et al. ...

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• Measurement of the dark halo shape in polar ring galaxies
• Galaxy sector, archive 2014
• RCJ0311+0507

... 2011 December 30 . The Diner at the Center of the Galaxy . ... Explanation: The monster at the center of our Galaxy is about to get fed . Recent observations by the Very Large Telescopes indicate that a cloud of gas will venture too close to the supermassive black hole at the Galactic center. The gas cloud is being disrupted, stretched out, heated up, and some of it is expected to fall into the black hole over the next two years. ... NASA Official: Phillip Newman Specific rights apply . ...

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• APOD: 2014 May 20 - In the Center of Spiral Galaxy M61
• APOD: 2001 May 16 - The Center of the Circinus Galaxy in X-Rays
• APOD: 2015 November 30 - In the Center of Spiral Galaxy NGC 3521

ESAC Calibration management What does that mean ? ... 14 June 2006 Marcus G. F. Kirsch Marcus Kirsch , XMM-Newton European Space Astronomy Center Page 1 menu · X-ray calibration in the last century · Can we do better · Calibration management · Committee for X-ray calibration · Calibration mission scenario ESAC Marcus Kirsch , XMM-Newton European Space Astronomy Center Page 2 ...

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• http://xmm.vilspa.esa.es/external/xmm_sw_cal/icwg/presentations/cal_standards_collection.pdf
• http://xmm.vilspa.esa.es/external/xmm_sw_cal/icwg/presentations/WS_SC.txt
• http://xmm.vilspa.esa.es/calibration/find_obs_logz_new.cgi

... Our Sun is part of a huge wheel-shaped collection of stars. ... Astronomers have long suspected it was a very massive black hole, and that every galaxy had such a central mass, created early in the history of the universe. ... However, unless that object happens to be headed directly at the black hole (a relatively small target) it will just swing around and fly away again, like a comet making a pass at the Sun. The velocity acquired in falling towards the black hole also helps it escape. ...