Steeljaw Scribe

Looking for clues at the scene of the crime

Programming Alert: “Air Group 16 – We Came to Remember”

By Steeljawscribe, on May 26th, 2007

Air date: Sunday, 27 May 2007 @ 2130 on your local PBS station

“Air Group 16: We Came To Remember” tells the story of the last reunion of Air Group 16 — the pilots, radiomen and gunners who served on the aircraft carrier USS Lexington in the Pacific in World War II. The film follows the veterans and their families as they make the journey by train, plane and car to Washington, DC, for their final reunion at the dedication of the National World War II Memorial in May 2004. Through stunning archival footage, period music and dramatic first-person accounts, the film follows Air Group 16 as they tell their stories, remember their fallen comrades, and are officially honored by the country they served.

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Active Black Hole Squashes Star Formation

New data from the Herschel Space Observatory shows that galaxies with the most powerful, active, supermassive black holes at their cores produce fewer stars than galaxies with less ones. Supermassive black holes are believed to reside in the hearts of all large galaxies. When gas falls upon these monsters, the materials are accelerated and heated around the black hole, releasing great torrents of energy. In the process, active black holes often generate colossal jets that blast out twin streams of heated matter. Inflows of gas into a galaxy also fuel the formation of new stars. In a new study of distant galaxies, Herschel helped show that star formation and black hole activity increase together, but only up to a point. Astronomers think that if an active black hole flares up too much, it starts spewing radiation that prevents raw material from coalescing into new stars. This artist concept of the local galaxy Arp 220, captured by the Hubble Space Telescope, helps illustrate the Herschel results. The bright core of the galaxy, paired with an overlaid artist's impression of jets emanating from it, indicate that the central black hole's activity is intensifying. As the active black hole continues to rev up, the rate of star formation will, in turn, be suppressed in the galaxy. Astronomers want to further study how star formation and black hole activity are intertwined. Herschel is a European Space Agency cornerstone mission, with science instruments provided by consortia of European institutes, with important participation by NASA. Image Credit: NASA/JPL-Caltech
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