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Recent papers relevant to cosmology that seemed extra interesting
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Nov11-12, 07:46 PM
The recent report from the South Pole Telescope seemed to several of us to be exceptionally interesting making one think we might have a thread that just lists recent papers, as they come out, which seem as if they might be important to cosmology. Here are a few.
A Measurement of the Cosmic Microwave Background Damping Tail from the 2500-square-degree SPT-SZ survey
K. T. Story, et al.
(Submitted on 26 Oct 2012)
We present a measurement of the cosmic microwave background (CMB) temperature power spectrum using data from the recently completed South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. This measurement is made from observations of 2540 deg2 of sky with arcminute resolution at 150 GHz, and improves upon previous measurements using the SPT by tripling the sky area. We report CMB temperature anisotropy power over the multipole range 650< "ell" <3000. ...Adding SPT measurements significantly improves LCDM parameter constraints, and in particular tightens the constraint on the angular sound horizon θs by a factor of 2.7. The impact of gravitational lensing on the CMB power spectrum is detected with 8.1 σ, the most significant detection to date. The inferred amplitude of the lensing spectrum is consistent with the LCDM prediction. This sensitivity of the SPT+WMAP7 data to lensing by large-scale structure at low redshifts allows us to constrain the mean curvature of the observable universe ... Adding low-redshift measurements of the Hubble constant (H0) and the baryon acoustic oscillation (BAO) feature to the SPT+WMAP7 data leads to further improvements. The combination of SPT+WMAP7+H0+BAO constrains ns = 0.9538 ± 0.0081 in the ΛCDM model, a 5.7 σ detection of ns < 1,...[abridged]
Comments: Submitted to ApJ. 21 pages, 10 figures
Super-luminous supernovae at redshifts of 2.05 and 3.90
Jeff Cooke (Swinburne), Mark Sullivan (Oxford), Avishay Gal-Yam (Weizmann), Elizabeth J. Barton (UC Irvine), Raymond G. Carlberg (Toronto), Emma V. Ryan-Weber (Swinburne), Chuck Horst (San Diego State), Yuuki Omori (McGill), C. Gonzalo Diaz (Swinburne)
(Submitted on 8 Nov 2012)
A rare class of 'super-luminous' supernovae that are about ten or more times more luminous at their peaks than other types of luminous supernovae has recently been found at low to intermediate redshifts. A small subset of these events have luminosities that evolve slowly and result in radiated energies of around 10^51 ergs or more. Therefore, they are likely examples of 'pair-instability' or 'pulsational pair-instability' supernovae with estimated progenitor masses of 100 - 250 times that of the Sun. These events are exceedingly rare at low redshift, but are expected to be more common at high redshift because the mass distribution of the earliest stars was probably skewed to high values. Here we report the detection of two super-luminous supernovae, at redshifts of 2.05 and 3.90, that have slowly evolving light curves. We estimate the rate of events at redshifts of 2 and 4 to be approximately ten times higher than the rate at low redshift. The extreme luminosities of super-luminous supernovae extend the redshift limit for supernova detection using present technology, previously 2.36, and provide a way of investigating the deaths of the first generation of stars to form after the Big Bang.
Comments: Accepted version of the paper (3 pages, 1 table, 3 figures) appearing in Nature, including Supplementary Information (11 pages, 2 tables, 5 figures)
A Census of Star-Forming Galaxies in the z~9-10 Universe based on HST+Spitzer Observations Over 19 CLASH clusters: Three Candidate z~9-10 Galaxies and Improved Constraints on the Star Formation Rate Density at z~9.2
R. Bouwens, et al.
(Submitted on 9 Nov 2012)
What I'd like to have this thread do is simply list the recent notable papers, so as to have their links and abstracts handy---while DISCUSSION and questions that might arise can be in separate threads as needed. that way this thread stays pretty much a simple bibliography: selective and specializing in the latest observational cosmology.
Nov13-12, 03:08 AM
(Just subscribing to the thread to keep it at the top of my lists.)
Marcus, I think it's a great idea.
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