1 / 20

Black Hole Jets

Black Hole Jets. Acceleration of jets Collimation of jets Superluminal motion Evolution of jets. Jets. | -- Size of our Galaxy -- |. Jets. Acceleration of a jet. Collimation of a jet. Production of jets is not well understood and is a major topic in current research.

yelena
Download Presentation

Black Hole Jets

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Black Hole Jets • Acceleration of jets • Collimation of jets • Superluminal motion • Evolution of jets

  2. Jets | -- Size of our Galaxy -- |

  3. Jets

  4. Acceleration of a jet

  5. Collimation of a jet Production of jets is not well understood and is a major topic in current research.

  6. Superluminal motion

  7. What is the lifetime of this jet? | ------------------ | = 150,000 light years

  8. Evolution of Jets • Jets from active galaxies are large and change slowly. • Jets from solar-mass black holes are smaller, by the ratio of the black hole masses, and change more rapidly. • It is possible to study the evolution of jets from solar-mass black hole.

  9. Jets of XTE J1550-564 Show movie then animation.

  10. Jet deceleration • Approaching jet decelerates gradually. • Receding jet brightens only after sharp deceleration. First direct observation of gradual deceleration of BH jet.

  11. Intermediate Mass Black Holes • Eddington limit • Beaming • Nebula around a black hole

  12. A black hole is observed at a luminosity of 3,000,000 solar luminosities. The black hole mass must be • at least 100 solar masses • less than 100 solar masses • exactly 100 solar masses • impossible to determine

  13. Black hole masses • Two types of black holes • Stellar mass black holes are up to 20 solar masses, formed in collapse of stars • Supermassive black holes are 106-109 solar masses, found only in the nuclei of galaxies • Is there anything in between?

  14. Starburst galaxy – M82

  15. Starburst galaxy M82 in X-rays Green cross is center of galaxy Bright X-ray source is 15,000,000 solar luminosities From Eddington limit, looks like a 500 solar mass black hole

  16. Beaming Is the source really as luminous as it looks or are the X-rays in a beam pointing towards us?

  17. Nebula surrounding a BH • X-rays from the BH ionize Helium in the nebula which causes the Helium to emit one particular spectral line • By counting the number of photons in this spectral line of Helium, we can count the number of X-rays and find the true X-ray luminosity in all directions

  18. Nebula around a black hole • Image from “slit-less” spectrograph • Horizontal axis shows position • Vertical axis shows combination of position and wavelength

  19. Nebula around a black hole Black hole is at least 750,000 solar luminosities. Mass is at least 25 solar masses.

  20. Review Questions • How are jets accelerated? • How are jets collimated? • Do superluminal jets really move faster than the speed of light? • Do the jets of stellar-mass black holes evolve faster or slower than the jets of supermassive black holes? • Estimating the mass of a black from its observed flux depends on what assumption?

More Related