is general relativity correct theory of gravitation?
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Is General Relativity correct theory of gravitation?. Numerous tests of GR exist in weak fields Precession of orbit of Mercury Bending of star light at solar eclipse Gravitational lenses Binary Pulsar Frame dragging (LAGEOS, Gravity Probe B) - PowerPoint PPT PresentationTRANSCRIPT
Is General Relativity correct theory of gravitation?
• Numerous tests of GR exist in weak fields• Precession of orbit of Mercury• Bending of star light at solar eclipse• Gravitational lenses• Binary Pulsar• Frame dragging (LAGEOS, Gravity Probe B)• New Test: Precession of orbit & emission of
gravitational waves in OJ287• Strong field -> Black holes
OJ 287
A Binary Black Hole SystemSillanpää et al. 1988, Lehto & Valtonen1996,
Sundelius et al. 1997
.
Unique solution of the timing problem
• Six well timed outburts• Iterative code• Astrophysical effects: disk bending, delay
of radiation burst
2005 outburst
Predictions for 2007 Sept no gravitational radiation: Oct 4
• OJ 287 timing models• eccentricity• 0.668 0.668 0.6667 0.655• precession• 37.0 36.9 37.0 39.2• delay• 0.75 0.70 0.75 1.0• 1913.01• 1956.27 1956.18 1956.24 1956.97• 1963.74 1963.81 1963.69 1964.02• 1972.97 1972.97 1972.97 1972.97• 1984.15 1984.15 1984.15 1984.14• 1994.66 1994.66 1994.65 1994.60• 1995.85 1995.85 1995.85 1995.88• 2005.78 2005.78 2005.77 2005.76• 2007.68 2007.68 2007.69 2007.70• Sept 5 Sept 5 Sept 9 Sept 13
Harvard plates: Basta & Hudec
1963-1964: new data
OJ287 in September 2007
Future optical light curve
OJ 287 optical variations
1. Jet wobble, 60 yr cycle + 12 yr steps
2. Tidal variations in jet flow, 12 yr cycle
3. Disk impacts, advance relative to the 12 year cycle due to precession
Complete solution of the problem: timing of 6 outbursts
Jet wobble
From jet wobble to magnitude variations
Tidal variations in jet flow: 1972
Tidal variations in jet flow: 1996
In radio: two processes
Three processes vs. optical light curve
.No outburst in hard X-rays; outburst in soft X-rays
At outburst
Pre-outburst
Predictions: rotation of radio jet
• .
.
Radio jet P.A.
RADIO JET ORIENTATION AND THE PRECESSING BINARY BLACK HOLE MODEL OF OJ287
M.J. VALTONEN, K.WIIK AND T.SAVOLAINENDepartment of Physics and Tuorla Observatory, University of Turku, Finland
Under preparation
The structure of the November 2005 outburst in OJ287 and the precessing binary black hole modelMauri Valtonen1, Mark Kidger2,3, Harry Lehto4 & Gary Poyner5
Binary model
1983, 1994 & 2005 outbursts
• Time scales:0.06 yr, 0.08 yr, 0.12 yr
Predictions: historical light curve outburst in 1956
2005 outburst twice as long as 1983 outburst
1983, 1994 & 2005 outbursts
• Time scales:22 d, 29 d, 45 dRelative timing:1982.991994.722005.77
After outburst light curve
• 1 time unit = 0.06 yr
Structure the same in 2005 as in 1983, but a factor of two slower
• 3 peak structure
The structure of the November 2005 outburst in OJ287 and the precessing binary black hole model [1]
Mauri Valtonen1,2, Mark Kidger3,4, Harry Lehto1,5 & Gary Poyner6
[1] Prepared in part with observations from the Bradford Robotic Telescope at the Instituto de Astrofísica de Canarias’s Teide Observatory.
2005 & 1983: same total energy
2005: 4 months; 1983: 2 months, 2x brighter
32 2
1
1
n
p GM GMz
z z RR z
H M R
ns
vM
c Mach number
These accretion disks are thin.
Overall properties of steady accretion rate disks
Vertical structure
Radio data: no outburst