Next: Zeeman Analysis Up: Modelling galactic disks Previous: Fitting a rotation curve . ... To make the tilted ring model one must utilise also imgen and maths (see Sections 18.7 and 18.5 ). The warp is simulated by varying the inclination and position angles of successive annuli (usually suggested from various plots from data.cube such as closure of isovelocity contours along the major axis and twists in channel maps showing the minor axis). ... centred 60 arcsec south of the image centre, . ...

... Authors: Andrew S. Wilson Water vapor masers provide the only emission line from accretion disks in active galaxies that can be imaged directly. I review the properties of this emission, emphasising how it can be used to derive physical properties of the accretion disks on scales ~ 10 4 - 10 7 gravitational radii. ... Surveys of active galaxies indicate that a high column density of gas (> 10 22 H atoms cm -2 ) to the nucleus is required for detectable H 2 O maser emission. ...

Presented on Tuesday, January 7, 2003 . We construct a detailed longitude-velocity diagram through the actual midplane of the Galactic H I disk. The Galactic midplane definition is based on single-dish sky surveys, and the detailed l-v slice ( Fig. 1 ) is extracted from the Canadian Galactic Plane Survey ( CGPS ; Taylor et al. 2003 ). ... Note: other slices offset from this one were not shown in the AAS poster for lack of space, but they are available here . ...

... CXC , NASA Explanation: In spiral galaxies, majestic winding arms of young stars and interstellar gas and dust rotate in a disk around a bulging galactic nucleus. Elliptical galaxies seem to be simpler, randomly swarming with old stars and lacking gas and dust. So astronomers were excited to find that NGC 1700, a young elliptical galaxy about 160 million light-years away, shows evidence for a 90,000 light-year wide rotating disk of multi-million degree hot gas. ... Elliptical Galaxy M87 . ...

... 2003 January 16 . NGC 1700: Elliptical Galaxy and Rotating Disk . ... CXC , NASA . ... So astronomers were excited to find that NGC 1700, a young elliptical galaxy about 160 million light-years away, shows evidence for a 90,000 light-year wide rotating disk of multi-million degree hot gas. ... Theories about the origin of the disk suggest that NGC 1700 may be the result of a cosmic scale galactic merger , perhaps between a spiral and elliptical galaxy. ... About APOD | ... NASA Technical Rep.: ...

. F IGURE . 3. The metallicity distribution of F stars of the restored sample in different age ranges at three distances from the galactic plane. The curves are the approximation of the histograms by the sum of two Gaussians. The ordinates are the percentage of such stars in the total restored number of stars. discussion in the text | next figure | previous figure .

... A homogeneous chemical analysis of the inner Galactic disk from the first data release of Gaia-ESO . ... Gaia-ESO is a public spectroscopic survey designed with this goal in mind. ... These first results highlight the potential of the Gaia-ESO survey to explore areas of the Milky Way still poorly studied, such as the inner disk, and to give new constraints on Galactic chemical evolution models. ... Map of observed targets of the first data release of the Gaia-ESO Survey. ...

Bizyaev D., "The Argument Against Long Extragagalactic Distance Scale", Astron. ... Soviet Astronomy) 1997. ... Zasov A., Bizyaev D., "An Estimate of the Hubble Constant using a Criterion for Gravitational Stability of Gaseous Discs", Pis'ma v Astron. ... 1996. ... D.Bizyaev, "Types of galaxies", 1996, Zvezdochet, No 11, p.22 (in Russian) . D.Bizyaev, "The Hubble Constant", 1996, Zvezdochet, No 2, p.20 (in Russian) . D.Bizyaev, "Magellanic Clouds", 1995, Zvezdochet, No 6, p.12. (in Russian) . ...

... The formation of the disks of disk galaxies remains poorly understood. ... Many disk galaxies have only the thin disk component, with no bulge or significant thick disk. ... Almost all disk galaxies have an exponential radial surface brightness distribution. The reason for this exponential form is not known; nor is it known when the exponential form is established. ... We would compare low redshift galaxies observed in the I band with galaxies at z =0.5 in the J band and at z =1 in the H band. ...

... SS433 is a close binary system, one star is a supergiant, a second one is a black hole. ... Even a black hole cannot accept such an enormous mass flux, a supercritical accretion disk appears, all the excess gas glows up to several tens of thousands degrees and is ejected off the disk with enormous velocities. ... SAO researchers have found an evidence of the supercritical accretion onto a black hole in SS433, which follows from a brightness variability of the SS433 disk. ...

... Bad Astronomy . ... Mad Science . ... Or..why don't the planets orbit the sun in the same plane as the sun orbits the galactic center? ... The writer suggested that the angular momentum of the stars was related to the original cloud that collapsed to form them and not the galaxy angular momentum. ... As I understand the answer to 902372110.as, if the stars orbit is not related to the galaxy spin, then I would expect the stars to orbit the galaxy at a multitude of random orbits and no disk to form. ...

... 371Gregory Taylor . ... We persent a catalog of 1274 discrete sources detected during a 5 yr, 6 cm, radio-patrol survey of the galactic plane for variavle sources. ... Seventy-five percent of the sources are weaker than 75 mJy, and as a consequence reliable sources and 27 possible variables were detected, of which 64 % exhibited shirt-term variability. ... A comparison with previous centimeter variability studies suggests the possible existence of two distinnct variability components. ...

... Black holes are found at the centres of galaxies which are similar in size to our own Milky Way Galaxy or larger. When black holes collide and merge they form supermassive black holes which are events among the most powerful in the universe. ... 55, No. 1, pages 1-5, 'Observational Effects of Strong Gravity in Vicinity of Supermassive Black Holes' . ... International Year of Astronomy, Ireland National Node . ...

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. ...

... Tonight's Sky . тАФ . ... RISE тАФ . ... Observing . ... Star Atlas . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... What exactly is a degree in terms of the distance between stars? ... A measurement in degrees has nothing to do with the true distances between celestial objects. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

Next: Results of calculations Up: Initial conditions Previous: Initial velocity . We consider motion of the stars in the Galaxy with a model axially symmetrical potential which becomes quasi-spherical at large distances from the galactic center and gives rise to the observed galactic rotation curve. As an example we have taken the galactic potential as in Paczynsky (1990) paper. The potential consists of two disk components corresponding to the galactic disc and the buldge . ...

2014 May version . ... Green D. A., 2014 , Bulletin of the Astronomical Society of India, 42 , 47-58. ( .pdf , or arXiv.org:1409.0637 ) If you make use of the detailed version of the catalogue, then plaese also cite: . Green D. A., 2014, `A Catalogue of Galactic Supernova Remnants (2014 May version)' , Cavendish Laboratory, Cambridge, United Kingdom (available at "http://www.mrao.cam.ac.uk/surveys/snrs/" ). ... Copyright D. A. Green 2014. 25872nd access to this version of the catalogue. ...

... The circumnuclear GASEOUS disks are often decoupled from the circumnuclear stellar disks and are even stronger inclined to the outer disk planes; in fact, we have found a considerable `population' of inner polar rings. Inner gas polar rings are found as in spiral galaxies with the massive outer gas disks co-planar to the main symmetry planes (e.g. NGC 2841, Sil'chenko et al. 1997, and NGC 7217, Sil'chenko & Afanasiev 2000) as well in many lenticular galaxies (Fig. ...

... Type of detector . Image resolution . Whole-disk . Disk resolution . Doppler . ... Birmingham Solar Oscillation Network (6 sites) . ... Global Oscillation Network Group)(6 sites) . ... Low - L (degree of mode), 1 site, l=0-100) . ... High Degree Helioseismology Network, 2 sites) . ... Global Oscillations at Low Frequencies) . ... Michelson Doppler Imager/Solar Oscillations Investigation) . ... Variability of Solar Irradiance and Gravity Oscillations); . ...

... On the base of laboratory simulations (on rotating shallow water) of the formation of spiral arms in galactic gaseous disks, the existence of giant anticyclones in them was predicted. Numerical simulations shown that the vortex structures arise on a linear stage of spiral arms formation simultaneously with the latter. ... Thus second giants structures, after spiral arms, in spiral galactic disks are discovered. ...