logging in or signing up RameshNarayanSciWrit ers Nastasia Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 42 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: November 29, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Black Hole Event Horizon: Black Hole Event Horizon A Black Hole has a truly unique property: it possesses an Event Horizon A “virtual” surface One-way membrane --- matter/energy can fall in, but nothing gets out, not even light Singularity Event HorizonA Black Hole is Amazingly Simple: A Black Hole is Amazingly Simple Mass: M Spin: a* (J=a*GM2/c) Charge: Q Even though it is a macroscopic object, a BH is as simple as an elementary particle!Can We Test These Features?: Can We Test These Features? Confirm that astrophysical BHs actually do have Event Horizons Measure the two fundamental parameters of BHs Mass (relatively easy) Spin (much harder) Ramesh Narayan, Jeff McClintockDo Black Hole Candidates Have Event Horizons?: Do Black Hole Candidates Have Event Horizons? Are Black Hole Candidates really BHs? Can we find independent evidence that our BH candidates actually possess Event HorizonsX-ray Binaries: X-ray Binaries Image credit: Robert Hynes (2002)The Idea: The Idea Find BH X-ray Binaries in which the accretion flow radiates very little Objects with surfaces (NSs) will then be much brighter than objects with event horizons (BHs) Look for a huge difference in luminosity Narayan, Garcia & McClintock (1997)Slide7: Large difference in luminosity between BHs and NSs is dramatically verified (Narayan, Garcia & McClintock; Garcia et al. 2001; McClintock et al. 2003; …) Black Holes are really black!! Event HorizonBlack Hole Spin: Black Hole Spin The material from which a BH is formed almost always has angular momentum Also, accretion adds angular momentum So we expect astrophysical BHs to be spinning: J = a*GM2/c, 0 a* 1 Can we measure a*?The Basic Idea: The Basic Idea Measure radius of hole by estimating area of the bright inner disk (Zhang et al. 1997; Shafee et al. 2006; McClintock et al. 2006)Black Hole Parameters: Black Hole Parameters You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
RameshNarayanSciWrit ers Nastasia Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 42 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: November 29, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Black Hole Event Horizon: Black Hole Event Horizon A Black Hole has a truly unique property: it possesses an Event Horizon A “virtual” surface One-way membrane --- matter/energy can fall in, but nothing gets out, not even light Singularity Event HorizonA Black Hole is Amazingly Simple: A Black Hole is Amazingly Simple Mass: M Spin: a* (J=a*GM2/c) Charge: Q Even though it is a macroscopic object, a BH is as simple as an elementary particle!Can We Test These Features?: Can We Test These Features? Confirm that astrophysical BHs actually do have Event Horizons Measure the two fundamental parameters of BHs Mass (relatively easy) Spin (much harder) Ramesh Narayan, Jeff McClintockDo Black Hole Candidates Have Event Horizons?: Do Black Hole Candidates Have Event Horizons? Are Black Hole Candidates really BHs? Can we find independent evidence that our BH candidates actually possess Event HorizonsX-ray Binaries: X-ray Binaries Image credit: Robert Hynes (2002)The Idea: The Idea Find BH X-ray Binaries in which the accretion flow radiates very little Objects with surfaces (NSs) will then be much brighter than objects with event horizons (BHs) Look for a huge difference in luminosity Narayan, Garcia & McClintock (1997)Slide7: Large difference in luminosity between BHs and NSs is dramatically verified (Narayan, Garcia & McClintock; Garcia et al. 2001; McClintock et al. 2003; …) Black Holes are really black!! Event HorizonBlack Hole Spin: Black Hole Spin The material from which a BH is formed almost always has angular momentum Also, accretion adds angular momentum So we expect astrophysical BHs to be spinning: J = a*GM2/c, 0 a* 1 Can we measure a*?The Basic Idea: The Basic Idea Measure radius of hole by estimating area of the bright inner disk (Zhang et al. 1997; Shafee et al. 2006; McClintock et al. 2006)Black Hole Parameters: Black Hole Parameters