Arcadian Functor

occasional meanderings in physics' brave new world

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Marni D. Sheppeard

Friday, March 12, 2010

Galaxies and Quasars

Supernova Condensate reports on a mystery with our neighbouring galaxy M33. A member of the Local Group, M33 appears to be missing its large, central black hole! More precisely, an upper limit on the central mass of $3000$ solar masses is obtained.

In his book Quasars, Redshifts and Controversies, Halton Arp discusses quasars associated with M33. Figure 8.12 shows a line of high redshift quasars lying between M33 and M31, the Andromeda galaxy. There is also a concentration of low redshift quasars near M33.

Note that Andromeda has a possible binary black hole system at its core. The quasar data suggests a strong interaction between M33 and M31. This lends support to the unpopular idea that the central black holes, or lack thereof, of such galaxy pairs are not independent. A possible relation between high $z$ quasars and AGNs is discussed here.


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