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Galaxy And Mass Assembly (GAMA): z ∼ 0 Galaxy Luminosity Function down to L ∼ 106 L⊙ via clustering based redshift inference

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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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:
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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