01 Aug '13 13:57>
http://scitechdaily.com/new-method-for-measuring-black-hole-spin-could-provide-a-greater-understanding-of-galaxy-growth/
Originally posted by sonhouseThe article misses the real point, I had a look at the abstract. An alternative method of measuring the spin is given by "relativistic smearing of the iron profile". The figure they get from looking at the accretion disc is lower than expected - from the abstract:
http://scitechdaily.com/new-method-for-measuring-black-hole-spin-could-provide-a-greater-understanding-of-galaxy-growth/
While our data on PG1244+026 does not have sufficient statistics at high energy to give a good measure of black hole spin from the iron line profile, cosmological simulations predict that black holes with similar masses have similar growth histories and so should have similar spins. This suggests that there is a problem either in our understanding of disc spectra, or/and X-ray reflection or/and the evolution of black hole spin
Originally posted by DeepThoughtI imagine iron smearing wouldn't be much better than 20% accurate I would think. Better optics will give better data in coming years for sure, the Webb telescope seems to be back on track for launch in a few years so it will give us better looks at these strange objects.
The article misses the real point, I had a look at the abstract. An alternative method of measuring the spin is given by "relativistic smearing of the iron profile". The figure they get from looking at the accretion disc is lower than expected - from the abstract:[quote]While our data on PG1244+026 does not have sufficient statistics at high energy to essible (most people should cope with the introduction): http://arxiv.org/pdf/1306.4786v1.pdf