The Clustering of DESI-like Luminous Red Galaxies Using Photometric Redshifts. (arXiv:2001.06018v2 [astro-ph.CO] UPDATED)

The Clustering of DESI-like Luminous Red Galaxies Using Photometric Redshifts. (arXiv:2001.06018v2 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Zhou_R/0/1/0/all/0/1">Rongpu Zhou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Newman_J/0/1/0/all/0/1">Jeffrey A. Newman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mao_Y/0/1/0/all/0/1">Yao-Yuan Mao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Meisner_A/0/1/0/all/0/1">Aaron Meisner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moustakas_J/0/1/0/all/0/1">John Moustakas</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Myers_A/0/1/0/all/0/1">Adam D. Myers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Prakash_A/0/1/0/all/0/1">Abhishek Prakash</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zentner_A/0/1/0/all/0/1">Andrew R. Zentner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brooks_D/0/1/0/all/0/1">David Brooks</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Duan_Y/0/1/0/all/0/1">Yutong Duan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Landriau_M/0/1/0/all/0/1">Martin Landriau</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Levi_M/0/1/0/all/0/1">Michael E. Levi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Prada_F/0/1/0/all/0/1">Francisco Prada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tarle_G/0/1/0/all/0/1">Gregory Tarle</a>

We present measurements of the redshift-dependent clustering of a DESI-like
luminous red galaxy (LRG) sample selected from the Legacy Survey imaging
dataset, and use the halo occupation distribution (HOD) framework to fit the
clustering signal. The photometric LRG sample in this study contains 2.7
million objects over the redshift range of $0.4 < z < 0.9$ over 5655 deg$^2$.
We have developed new photometric redshift (photo-$z$) estimates using the
Legacy Survey DECam and WISE photometry, with $sigma_{mathrm{NMAD}} = 0.02$
precision for LRGs. We compute the projected correlation function using new
methods that maximize signal-to-noise ratio while incorporating redshift
uncertainties. We present a novel algorithm for dividing irregular survey
geometries into equal-area patches for jackknife resampling. For a
five-parameter HOD model fit using the MultiDark halo catalog, we find that
there is little evolution in HOD parameters except at the highest redshifts.
The inferred large-scale structure bias is largely consistent with constant
clustering amplitude over time. In an appendix, we explore limitations of
Markov chain Monte Carlo fitting using stochastic likelihood estimates
resulting from applying HOD methods to N-body catalogs, and present a new
technique for finding best-fit parameters in this situation. Accompanying this
paper we have released the Photometric Redshifts for the Legacy Surveys (PRLS)
catalog of photo-$z$’s obtained by applying the methods used in this work to
the full Legacy Survey Data Release 8 dataset. This catalog provides accurate
photometric redshifts for objects with $z < 21$ over more than 16,000 deg$^2$
of sky.

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