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Phil Marshall

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XII. Time delays of the... - 0 views

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    Eulaers et al present two new time delay measurements, including one (in SDSS J1206+4332) to 3% accuracy! HS2209 is a new delay, now measured to +/- 25%. They adopt a "netflix" approach to the measurement, combining the results from four different techniques. Interested to see how they weight them.
Phil Marshall

The SOAR Gravitational Arc Survey - I: Survey overview and photometric catalogs - 2 views

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    Furlanetto et al selected 50-odd clusters in SDSS stripe 82 by richness, in two redshift bins, and then re-imaged in g, r and i at SOAR. Image quality is comparable to median LSST, but depth is only 22-23mag. Interesting sample for algorithm validation, but they are also interested in arc statistics
Jean-Paul Kneib

A Strongly-Lensed Massive Ultra-Compact Quiescent Galaxy at z ~ 2.4 in the COSMO - 2 views

    • Jean-Paul Kneib
       
      Nice confirmation of a ACS COSMOS detection - something that can be done by Euclid IR data
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    It's an EEL! In Auger et al (2011) we searched for and found a sample of early type - early type lens systems like this one, and found that their sources were compact too - but our sample was limited by the SDSS spectra to lower lens and source redshifts. We did find that you need to treat the lensing and PSF convolution quite carefully to make accurate measurements of size and flux though, especially given the strong degeneracy between effective radius and Sersic index. High resolution IR imaging with a stable, well characterised PSF would indeed help a lot.
Thomas Collett

Redshift Drift using Strong Lenses - 9 views

Thanks Eric. How bright do you think the lensed quasars need to be? How does the trade off between flux and timedelay work out? I looked into redshift drift a few years ago, and based on the assump...

timedelays cosmography

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