The ALHAMBRA survey: evolution of galaxy clustering since $z\sim 1$

Abstract

We study the clustering of galaxies as function of luminosity and redshift in the range $0.35<z<1.25$ using data from the Advanced Large Homogeneous Area Medium Band Redshift Astronomical (ALHAMBRA) survey. The ALHAMBRA data used in this work cover $2.38{\mathrm{deg}}^2$ in 7 independent fields, after applying a detailed angular selection mask, with accurate photometric redshifts, ${\sigma }_z\lesssim 0.014(1+z)$, down to $I_{\mathrm{AB}}<24$. Given the depth of the survey, we select samples in $B$-band luminosity down to $L^{\mathrm{th}}\simeq 0.16L^{\ast }$ at $z=0.9$. We measure the real-space clustering using the projected correlation function, accounting for photometric redshifts uncertainties. We infer the galaxy bias, and study its evolution with luminosity. We study the effect of sample variance, and confirm earlier results that the COSMOS and ELAIS-N1 fields are dominated by the presence of large structures. For the intermediate and bright samples, $L^{\mathrm{med}}\gtrsim 0.6L^{\ast }$, we obtain a strong dependence of bias on luminosity, in agreement with previous results at similar redshift. We are able to extend this study to fainter luminosities, where we obtain an almost flat relation, similar to that observed at low redshift. Regarding the evolution of bias with redshift, our results suggest that the different galaxy populations studied reside in haloes covering a range in mass between ${\log }_{10}[M_{\mathrm{h}}/(h^{-1}{\mathrm{M}}_{\odot })]\gtrsim 11.5$ for samples with $L^{\mathrm{med}}\simeq 0.3L^{\ast }$ and ${\log }_{10}[M_{\mathrm{h}}/(h^{-1}{\mathrm{M}}_{\odot })]\gtrsim 13.0$ for samples with $L^{\mathrm{med}}\simeq 2L^{\ast }$, with typical occupation numbers in the range of $\sim 1-3$ galaxies per halo.

21 pages, 16 figures, 3 tables. Accepted for publication in MNRAS. v2: matches accepted version. Small changes following referee comments, including addition of new fig. 11 and discussion on halo occupation numbers. Main results remain unchanged

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• The PAU Survey: Spectral features and galaxy clustering using simulated narrow band photometry
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• The ALHAMBRA survey : $B-$band luminosity function of quiescent and star-forming galaxies at $0.2\le z<1$ by PDF analysis
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• The ALHAMBRA survey: tight dependence of the optical mass-to-light ratio on galaxy colour up to z = 1.5
• The Cross-correlation of MgII Absorption and Galaxies in BOSS
• High redshift galaxies in the ALHAMBRA survey: I. selection method and number counts based on redshift PDFs
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• Stochastic Order Redshift Technique (SORT): a simple, efficient and robust method to improve cosmological redshift measurements
• The evolution of Balmer jump selected galaxies in the ALHAMBRA survey
• Morpho-statistical characterisation of the spatial galaxy distribution through Gibbs point processes
• High redshift galaxies in the ALHAMBRA survey: II. strengthening the evidence of bright-end excess in UV luminosity functions at 2.5 <= z <= 4.5 by PDF analysis