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Clocking Super-Massive Black Hole Spin with Accuracy. MCG–6-30-15:. Observations by Suzaku unambiguously confirm the extremely broad Fe K line in MCG–6-30-15 We accurately quantify how far in the accretion disk reaches (< 2 gravitational radii)

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Clocking super massive black hole spin with accuracy
Clocking Super-Massive Black Hole Spin with Accuracy

MCG–6-30-15:

  • Observations by Suzaku unambiguously confirm the extremely broad Fe K line in MCG–6-30-15

  • We accurately quantify how far in the accretion disk reaches (< 2 gravitational radii)

  • The presence of a Kerr, or spinning, black hole is confirmed

  • We measure the black hole spin parameter to be 90% of maximum


Warped space time light bending near the black hole in mcg 6 30 15
Warped Space-Time & Light-Bending Near the Black Hole in MCG–6-30-15

  • Observationally confirm that space-time very close to the black hole is "warped", a key component in Einstein's General Relatively

  • Light paths close to the black hole can be sharply curved: photons traveling away from the accretion disk can be redirected onto the disk

  • Confirmation made possible only via Suzaku’s broad energy coverage


Evidence for gravitational light bending around the black hole in mcg 6 30 15
Evidence for gravitational light bending around the black hole in MCG–6-30-15

Strong iron K line and disk reflection from around a Kerr (spinning) black hole.

No strong variations in iron line - gravitational light bending around a Kerr Black hole.

Suzaku lightcurve

Constant Reflection hump and iron line


Clocking super massive black hole spin with accuracy

Suzaku can measure the geometry of the accretion disk hole in MCG–6-30-15

In MCG–5-23-16, the disk is viewed at an inclination angle of 50 degrees

In MCG–6-30-15, the disk is viewed more face-on, at an angle of 30 degrees

“Edge-on” Disk

“Face-on” Disk


Suzaku black hole spin measurements
Suzaku Black Hole Spin Measurements hole in MCG–6-30-15

MCG–5-23-16 (no evidence for black hole spin)

MCG–6-30-15 (spinning black hole)


Iron line emission from multiple regions of gas
Iron Line Emission From Multiple Regions of Gas hole in MCG–6-30-15

MCG -5-23-16

Narrow line

Broad line

  • Suzaku has unambiguously measured the broad and narrow iron lines.

  • Narrow line emission denotes (low velocity) gas, distant from the black hole, far from the region of extreme gravity

  • X-ray emission is seen both from gas very close to the black hole and gas that is distant

  • Confirms our picture of the geometry and accretion flow in AGN


Clocking super massive black hole spin with accuracy

XMM/Chandra hole in MCG–6-30-15

Suzaku

Suzaku’s Broad Bandpass

Absorption from outflow

X-ray Continuum

Iron KLine

Thermal Disk Emission?

Compton Reflection hump