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Astronomen entschlüsseln Geheimnis der rasanten Entwicklung des Zentralsterns im Stingray-Nebel

By Guest PostOctober 9, 2016Sciencecos, cosmic origins spektrograph, entwicklung des zentralsterns, geheimnis, nicole reindl, stingray nebel

Forscher der Universität Tübingen analysieren wiedergeborenen Stern in bisher nicht beobachteter Entwicklungsphase

Einem internationalen Team von Astronomen ist es mithilfe von Daten des Hubble-Weltraumteleskops gelungen, eine bisher nicht beobachtete Sternentwicklung in Echtzeit zu studieren. Frühere Beobachtungen des Sterns mit dem Namen SAO 244567 ließen einen dramatischen Anstieg seiner Temperatur erkennen. Neueste Daten belegen nun, dass sich der Stern in den vergangenen Jahrzehnten deutlich abgekühlt haben muss und damit in eine frühere Lebensphase wiedergeboren wurde. SAO 244567 ist bisher der einzige wiedergeborene Stern, der sowohl während der Aufheizungs- als auch der Abkühlungsphase beobachtet wurde. Die Studienergebnisse werden nun in den Monthly Notices of the Royal Astronomical Society publiziert. Neben Professor Klaus Werner und Dr. Thomas Rauch gehörte auch die Erstautorin der Studie Dr. Nicole Reindl zum Institut für Astronomie und Astrophysik der Universität Tübingen; sie forscht mittlerweile an der britischen University of Leicester. (more…)

Spiral galaxies like Milky Way bigger than thought, says CU-Boulder study

By Guest PostJune 28, 2013Scienceboulder, brian keeney, casa, charles danforth, circumgalactic gas, cos, cos on hubble, cosmic origins spectrograph, diameter, galaxy evolution, higgs centre, Hubble Space Telescope, intergalactic interactions, james green, john stocke, light year, michael shull, Milky Way, missing link, scotland, spiral galaxy, supermassive black holes, theoretical physics, university of colorado, university of edinburgh

Let’s all fist bump: Spiral galaxies like our own Milky Way appear to be much larger and more massive than previously believed, according to a new University of Colorado Boulder study by researchers using the Hubble Space Telescope.

CU-Boulder Professor John Stocke, study leader, said new observations with Hubble’s $70 million Cosmic Origins Spectrograph, or COS, designed by CU-Boulder show that normal spiral galaxies are surrounded by halos of gas that can extend to over 1 million light-years in diameter. The current estimated diameter of the Milky Way, for example, is about 100,000 light-years. One light-year is roughly 6 trillion miles. (more…)

‘Sideline quasars’ helped to stifle early galaxy formation, says CU study

By Guest PostMarch 31, 2013Scienceastronomers, big bang, black holes, boulder, brightest quasars, caltech astronomer, cos, cosmic web, dark ages, david syphers, early universe, Epoch, fossil record, galaxy formation, gaseous material, gases in universe, generations of stars, helium atoms, helium gas, helium reionization era, Hubble Space Telescope, intergalactic global warming, intergalactic medium, ionizing radiation, lighthouse, maarten schmidt, michael shull, neutral helium gas, planetary sciences, plasma, quasar, quasi stellar, radio source, sideline quasars, stars or galaxies, swiss cheese, ultraviolet spectrograph, universe, university of colorado

University of Colorado Boulder astronomers targeting one of the brightest quasars glowing in the universe some 11 billion years ago say “sideline quasars” likely teamed up with it to heat abundant helium gas billions of years ago, preventing small galaxy formation.

CU-Boulder Professor Michael Shull and Research Associate David Syphers used the Hubble Space Telescope to look at the quasar — the brilliant core of an active galaxy that acted as a “lighthouse” for the observations — to better understand the conditions of the early universe. The scientists studied gaseous material between the telescope and the quasar with a $70 million ultraviolet spectrograph on Hubble designed by a team from CU-Boulder’s Center for Astrophysics and Space Astronomy. (more…)

CU-Boulder-Led Hubble Astronomy Team Uncovers Evidence of Early Heated Universe

By Guest PostOctober 8, 2010Scienceastrophysical and planetary sciences, big bang, black hole, black holes, charles danforth, cos, cosmic origins spectrograph, dwarf galaxies, galaxies, global warming, hubble, Hubble Space Telescope, kevin france, michael shull, NASA, quasar beacon, radiation, remote universe, small galaxies, universal warming, universe, university of colorado at boulder

If you think global warming is bad, 11 billion years ago the entire universe underwent what might be called universal warming. The consequence of that early heating was that fierce blasts of radiation from voracious black holes stunted the growth of some small galaxies for a stretch of 500 million years. (more…)

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Astronomen entschlüsseln Geheimnis der rasanten Entwicklung des Zentralsterns im Stingray-Nebel

Spiral galaxies like Milky Way bigger than thought, says CU-Boulder study

‘Sideline quasars’ helped to stifle early galaxy formation, says CU study

CU-Boulder-Led Hubble Astronomy Team Uncovers Evidence of Early Heated Universe