Apologies
Dear Loyal Readers,
Many apologies are due to the last week of non-posts. Sorry. Slightly ironically this is because I had a pretty productive week analysing my jackknife samples which ended up with a Omega_m-beta plot from Jose late on Friday evening. To summarise, at the moment a simple least squares fit to wp(sigma) and xi(r) I think favour a single power-law more (r_0 = 7.2+0.8-0.7, gamma = 1.78+0.14-0.10) but a double-power law cant be ruled out. Jose's first esimations from fitting the redshift-space distortions suggest Omega_M = 0.2, beta=0.5, velocity dispersion 400 km/s.
Other highlights of the week were another good Wednesday seminar from Ferguson (Edinburgh) talking about what we can learn by looking at very local galaxies (in this case M31 and M33) and if you see tidal stream features (M31 you do, M33 you dont).
Also, I gave a Observers' Lunch talk on Hopkins, Richards and Hernquist (astro-ph/0605678) "An Observational Determination of the Bolometric Quasar Luminosity Function" which makes some very strong but credible claims about quasar and black hole properties such as "birthrate" number and space density evolution, M* break-mass and "downsizing".
Many apologies are due to the last week of non-posts. Sorry. Slightly ironically this is because I had a pretty productive week analysing my jackknife samples which ended up with a Omega_m-beta plot from Jose late on Friday evening. To summarise, at the moment a simple least squares fit to wp(sigma) and xi(r) I think favour a single power-law more (r_0 = 7.2+0.8-0.7, gamma = 1.78+0.14-0.10) but a double-power law cant be ruled out. Jose's first esimations from fitting the redshift-space distortions suggest Omega_M = 0.2, beta=0.5, velocity dispersion 400 km/s.
Other highlights of the week were another good Wednesday seminar from Ferguson (Edinburgh) talking about what we can learn by looking at very local galaxies (in this case M31 and M33) and if you see tidal stream features (M31 you do, M33 you dont).
Also, I gave a Observers' Lunch talk on Hopkins, Richards and Hernquist (astro-ph/0605678) "An Observational Determination of the Bolometric Quasar Luminosity Function" which makes some very strong but credible claims about quasar and black hole properties such as "birthrate" number and space density evolution, M* break-mass and "downsizing".
posted by NPR at 4:08 PM
1 Comments:
i, for one, welcome this recent update to NPR's research blog. thanks.
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