Karademir, GS, Taylor, EN, Blake, C, Baldry, IK, Bellstedt, S, Bilicki, M, Brown, MJI, Cluver, ME, Driver, SP, Hildebrandt, H, Holwerda, BW, Hopkins, AM, Loveday, J, Phillipps, S and Wright, AH (2021) Galaxy And Mass Assembly (GAMA): z ∼ 0 Galaxy Luminosity Function down to L ∼ 106 L⊙ via clustering based redshift inference. Monthly Notices of the Royal Astronomical Society, 509 (4). pp. 5467-5484. ISSN 0035-8711

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Abstract

In this study we present a new experimental design using clustering-based redshift inference to measure the evolving galaxy luminosity function (GLF) spanning 5.5 decades from L ∼ 1011.5 to 106 L⊙. We use data from the Galaxy And Mass Assembly (GAMA) survey and the Kilo-Degree Survey (KiDS). We derive redshift distributions in bins of apparent magnitude to the limits of the GAMA-KiDS photometric catalogue: mr ≲ 23; more than a decade in luminosity beyond the limits of the GAMA spectroscopic redshift sample via clustering-based redshift inference. This technique uses spatial cross-correlation statistics for a reference set with known redshifts (in our case, the main GAMA sample) to derive the redshift distribution for the target ensemble. For the calibration of the redshift distribution we use a simple parametrisation with an adaptive normalization factor over the interval 0.005 < z < 0.48 to derive the clustering redshift results. We find that the GLF has a relatively constant power-law slope α ≈ −1.2 for −17 ≲ Mr ≲ −13, and then appears to steepen sharply for −13 ≲ Mr ≲ −10. This upturn appears to be where Globular Clusters (GCs) take over to dominate the source counts as a function of luminosity. Thus we have mapped the GLF across the full range of the z ∼ 0 field galaxy population from the most luminous galaxies down to the GC scale.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords:	0201 Astronomical and Space Sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
Related URLs:	http://arxiv.org/abs/2109.06136v2
Date Deposited:	07 Dec 2021 11:04
Last Modified:	05 Jan 2022 17:00
DOI or ID number:	10.1093/mnras/stab3229
URI:	https://researchonline.ljmu.ac.uk/id/eprint/15884

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