X-ray astronomy primarily involves the study of plasmas with thermal temperatures in the range of 1E6 to 1E8 K. Such plasmas radiate the bulk of their energy in the X-ray regime, from ca. 0.1 to 10 keV. ... Apart from X-ray continuum emission, produced through processes such as e.g. thermal bremsstrahlung, a significant fraction of the total emissivity of hot thermal plasmas can arise from line emission. ... XMM's science objectives are described here in two parts: . General science objectives . ...
... Courtesy of NASA/ESA Observation data (J2000 epoch) Constellation Right ascension Declination Redshift Distance Type Serpens Caput 15h 17m 14.4s[] +21° 35 08[] 12,740±50 km/s[][1] 600±30 Mly (183±8 Mpc)[1] SA0(r) [citation needed ] [a] Apparent dimensions (V) 0.28 в 0.28[] Apparent magnitude (V) 16.0[] Notable features Ring galaxy Other designations PGC 54559,[] PRC D-51[] See also: Galaxy, List of galaxies Hoag's Object is a non-typical galaxy of the type known as a ring galaxy. ...
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Ссылки http://www.astro.louisville.edu/shared_skies/archive/select/unusual/hoags_object/20130412/hoags_object_wikipedia_20130422.pdf -- 498.8 Кб -- 22.04.2013 Похожие документы
... Synchronous Evolution of Galaxies in Groups: NGC 524 Group O. K. Sil'chenko and V. L. Afanasiev 245 ISSN 1990-3413, Astrophysical Bulletin, 2012, Vol. ... Four of the five galaxies revealed synchronized bursts of star formation in the nuclei 12 Gyr ago. The only galaxy, in which the ages of stellar population in the nucleus and in the bulge coincide (i.e. the nuclear burst of star formation did not take place) is NGC 502, the farthest from the center of the group of all the galaxies studied. ...
... Mark Jaworsky will present one early next year. ... It is theorized that Dark Matter is responsible for holding galactic (Program, continued on page 3) (Program, continued from page 2) systems together and that without it, galaxy-mass structures just would have not come into existence. ... Researchers use the theory of Dark Matter to explain this discrepancy. ... The standard theory of gravity still applies and dark matter still exists, but somehow the dark matter emulates MOND. ...
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Ссылки http://www.princetonastronomy.org/newsletters/01_2003sidereal.pdf -- 327.4 Кб -- 27.04.2003 Похожие документы
... Ещ± одна программа, предлагающая деньги за чтение писем, приходящих на ваш E-mail. Основная идея такая: вы регистрируетесь в программе, получаете свой персональный ID , просматриваете вашу почту и получаете по пять центов за каждое письмо, которое прид±т на ваш E-mail. ... И ещ± 45 долларов за письма, которые просмотрели ваши 100 подписчиков. ... Ссылку вы получите в письме, подтверждающем вашу регистрацию в программе. ... В этой программе мой "перебор" отойд±т моим-же подписчикам. ...
... In this case, the main vortex in the Benard cell is decomposed into smaller ones as a result of ten perioddoubling bifurcations. It is shown that the resulting turbulence is coherent and determinate; the fractal character (local selfsimilarity) of its spectrum is found. ... It is shown that the real atmospheric turbulence is the result of mixing of different coherent structures. ... COHERENT STRUCTURE IN A CLOSED ROOM The scheme of measurements in the LSVT spectrograph pavilion is shown in Fig. ...