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Findings from Spanish National Research Council (CSIC) Provide New Insights into Astronomy Research (Precise photometric redshifts with a narrow-band...

August 15, 2014



Findings from Spanish National Research Council (CSIC) Provide New Insights into Astronomy Research (Precise photometric redshifts with a narrow-band filter set: the PAU survey at the William Herschel Telescope)

By a News Reporter-Staff News Editor at Science Letter -- Current study results on Science have been published. According to news reporting from Bellaterra, Spain, by NewsRx journalists, research stated, "The Physics of the Accelerating Universe (PAU) survey at the William Herschel Telescope will use a new optical camera (PAUCam) with a large set of narrow-band filters to perform a photometric galaxy survey with a quasi-spectroscopic redshift precision of sigma(z)/(1 + z) similar to 0.0035 and map the large-scale structure of the universe in three dimensions up to i(AB) < 22.5-23.0."

The news correspondents obtained a quote from the research from Spanish National Research Council (CSIC), "In this paper, we present a detailed photo-z performance study using photometric simulations for 40 equally spaced 12.5-nm-wide (full width at half-maximum) filters with an similar to 25 per cent overlap and spanning the wavelength range from 450 to 850 nm, together with a ugrizY broad-band filter system. We then present the migration matrix r(ij), containing the probability that a galaxy in a true redshift bin j is measured in a photo-z bin i, and study its effect on the determination of galaxy auto-and cross-correlations."

According to the news reporters, the research concluded: "Finally, we also study the impact on the photo-z performance of small variations of the filter set in terms of width, wavelength coverage, etc., and find a broad region where slightly modified filter sets provide similar results, with the original set being close to optimal."

For more information on this research see: Precise photometric redshifts with a narrow-band filter set: the PAU survey at the William Herschel Telescope. Monthly Notices of the Royal Astronomical Society, 2014;442(1):92-109. Monthly Notices of the Royal Astronomical Society can be contacted at: Oxford Univ Press, Great Clarendon St, Oxford OX2 6DP, England. (Wiley-Blackwell - www.wiley.com/; Monthly Notices of the Royal Astronomical Society - onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966)

Our news journalists report that additional information may be obtained by contacting P. Marti, IEEC CSIC, ICE, E-08193 Bellaterra, Barcelona, Spain. Additional authors for this research include R. Miquel, F.J. Castander, E. Gaztanaga, M. Eriksen and C. Sanchez (see also Science).

Keywords for this news article include: Spain, Europe, Science, Bellaterra

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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