Synopsis
MPEG This sequence of illustrations begins by showing an active galactic nucleus (AGN), a supermassive black hole that is swallowing large amounts of gas via a disk. In the type of AGN shown here the central black hole is obscured by a thick donut-shaped cloud of dust and gas. A representation of the X-ray spectrum, or X-ray energy signature, of a typical obscured AGN is then shown in yellow, followed by the XMM spectrum of the event in RX J1242-11 (shown in blue). The clear difference between the obscured AGN spectrum and the XMM spectrum shows that RX J1242-11 is not an obscured AGN. An optical spectrum obtained earlier with HST rules out the possibility that RX J1242-11 is a "normal" AGN, where the nucleus containing the black hole is not obscured by dust and gas.
Uploader's description on archive.org
Details
- Collection
- NASA
More like this
Astronaut Training at Goddard Space Flight Center (2009)
Wide Field Camera 3: Extending Hubble's Vision (2009)
STIS Repair: The Quest for Renewed Exploration (2009)
ACS Repair: The Challenge to Fix Hubble's Best Survey Camera (2009)
Countdown to the Last Mission to Hubble (2009)
Exploring Physics Across the Universe (2009)
The Cry of Cassiopeia A (2005)
Hubble: Galaxies Across Space and Time' (2007)
Hubble's Deepest View Ever of the Universe Unveils Earliest Galaxies (2004)
Space Movie Reveals Shocking Secrets of the Crab Pulsar (2002)