Post-survey of spectroscopy 1concept mappingMonday, November 21, 11Frames of referenceEinstein’s theories of special and general relativity require you select your frame of reference• Spaghettification - define• “Your” experience as you fall approach the event horizon• Your “friend’s” experience watching you2Monday, November 21, 113http://casa.colorado.edu/~ajsh/schwp.htmlSchwarzschild RadiusSupermassive Black HolesSchwarzschild radius (center to event horizon) of a black hole depends solely on mass of black hole. Solar-mass star: radius is about 3 km. For a 5-million solar mass supermassive black hole, radius is ~15 million km.Monday, November 21, 114Supermassive Black HoleLurking in the Galaxy's NucleusMonday, November 21, 115 What evidence supports the theory that there is a supermassive black hole at the center of our galaxy? What is the supernova – enrichment connection?We cannot see the center of the MW.Monday, November 21, 116Multi-wavelength close-up of recent massive star-forming region near Galactic center.20-cm radio continuum (red) 25-µm mid-infrared (green)6.4-keV line emission (blue).Monday, November 21, 116Multi-wavelength close-up of recent massive star-forming region near Galactic center.20-cm radio continuum (red) 25-µm mid-infrared (green)6.4-keV line emission (blue).Monday, November 21, 116Multi-wavelength close-up of recent massive star-forming region near Galactic center.20-cm radio continuum (red) 25-µm mid-infrared (green)6.4-keV line emission (blue).Monday, November 21, 117Evidence for energetic stuff happening at center of Galaxyhttp://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galcenter.htmMonday, November 21, 117Evidence for energetic stuff happening at center of Galaxyhttp://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galcenter.htmMonday, November 21, 118Envelope of 60-million-degree gas around a young cluster of 150 stars, known as the Arches cluster within radius of about 1 ly. •Chandra x-ray data diffuse blue emission in the inset box.•Hubble Space Telescope infrared image (red)Monday, November 21, 118Envelope of 60-million-degree gas around a young cluster of 150 stars, known as the Arches cluster within radius of about 1 ly. •Chandra x-ray data diffuse blue emission in the inset box.•Hubble Space Telescope infrared image (red)Monday, November 21, 118Envelope of 60-million-degree gas around a young cluster of 150 stars, known as the Arches cluster within radius of about 1 ly. •Chandra x-ray data diffuse blue emission in the inset box.•Hubble Space Telescope infrared image (red)Monday, November 21, 1193.6 million solar massesList the evidence supporting the theory for a supermassive black hole at the center of our galaxy.Monday, November 21, 1110Milky Way’s SMBH is “starving” - not putting out as much energy as predicted.Monday, November 21, 1111With Chandra, astronomers found hot gas concentrated within the larger radio shell of Sgr A East. The gas is highly enriched by heavy elements, with four times more calcium and iron than the Sun, and that confirms earlier suspicions that Sgr A East is most likely a remnant of a supernova explosion. What wavelengths must we observe at? Why?What is the supernova – enrichment connection?What evidence supports the theory that there is a super-massive black hole at the center of our galaxy?Monday, November 21,
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