Cygnus X-1 is a Black Hole Binary Accretion

Cygnus X-1 is a Black Hole Binary Accretion Disks are Efficient E = mc2 Complete conversion of mass to energy is only possible in matter-antimatter annihilation But normal accretion disks can convert > 5.7% but < 32% of mass to energy This is far better than chemical reactions

(~ 0.0001 %) or even nuclear fusion (~0.7 %) Full conversion of 1 M /year = 5.7 year = 5.7 1039W Accretion Disks Can Launch Jets Numerical simulations of jet launching and

propagation. (PLATON; Stone) Q4: Quasars Require

Tremendous powers: 1039 Watts > 1012 L Small volumes because of rapid variations Jet production (frequently) THEREFORE, the standard model now involves BHs + Accretion Disks Accretion disks are very compact, with most energy coming out within 20 RS or ~5 light-hours for 108 M BH

Evidence for Supermassive Black Holes NGC 4261: at core of radio emitting jets is a clear disk ~300 lt-yrs across and knot of emission near BH Direct Evidence for Rotating Disk Masers formed in warped disk in NGC 4258 (and a

few other Seyfert galaxies) Supermassive BH at Core of Milky Way Radio core of Sgr A* is unresolved at 43 GHz, very close to RS for a 2.6 million solar mass BH weighed by orbits of stars measured over a decade in the infrared. Active Galactic Nucleus Model

Different AGN from Different Angles Luminous: Quasars seen close to perpendicular to disk and Ultraluminous Infrared Galaxies near disk plane Weaker: Type 1 or Type 2 Seyferts

If jets are important: BL Lacs along jet axis, Quasars at modest angles & Radio Galaxies at larger angles CONCLUSIONS Black holes are the natural endpoint of massive star evolution and they have been detected in

our galaxy and nearby ones. Quasars are distant, extremely powerful cores of galaxies. Accretion disks are efficient and ubiquitous. Accretion disks around supermassive BHs (106 to 1010 M) are the source of the tremendous powers emitted by quasars and other active galactic nuclei.

Recently Viewed Presentations



    Later, amnion will enlarge and fuse with chorion, forming the membrane which surrounds the fetus and contains the amniotic fluid in which the fetus floats. The next six weeks (2 wks - 8 wks of development) are the embryonic period....
  • R.10 Verbos Regulares

    R.10 Verbos Regulares

    R.10 Verbos Regulares el 1 de septiembre Make a list of at 3 -AR, 3 -ER verbs, and 3 -IR verbs that you remember from Spanish 1 (you don't have to translate them).
  • Estate Planning - World Bank

    Estate Planning - World Bank

    Nicholas M. Fobe, Esq. VERSTEGEN & FOBE Trust and Estate Attorneys 2011 Pennsylvania Avenue, N.W., Suite 500 Washington, D.C. 20006 (202) 452-1600 [email protected] Recommendations and Questions Execute Estate Planning. Avoid Probate. Avoid individually titled assets. Review beneficiary designations.
  • Academic Opportunities at UF - University of Florida

    Academic Opportunities at UF - University of Florida

    Academic Opportunities at UF. Robert Kwong, M.S. Academic Advisor . College of Liberal Arts and Sciences. University of Florida
  • PowerPoint Presentation

    PowerPoint Presentation

    Malaspina University College Other titles: Times New Roman Arial Verdana Default Design Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14...
  • Word Identification - Mrs. Potts Class

    Word Identification - Mrs. Potts Class

    Learn how to use the four cueing systems. Learn the components of word identification. Increase their range of strategies for analyzing words. The Four Cueing Systems ... Small group activity for teaching word identification skills: Guided reading (continued) More Intervention...
  • Trig Identities and Formulae - Pams Maths

    Trig Identities and Formulae - Pams Maths

    relations. rather than the graphs of inverse . functions. If we want to draw the graph of an inverse function we restrict the domain of the original trig function. This means we only reflect a small portion of the graph...

    NASA SPoRT (Geoffrey Stano, Kevin McGrath) NWS/NCEP Aviation Weather Center (Josh Scheck, Amanda Terborg) ... GOES-16 GLM FED in AWIPS/CAVE/D2D. Initial GOES-17 GLM FED implementation in AWIPS will be based on above. Next Steps for GLM Implementation Across NWS (1...