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Galaxy And Mass Assembly (GAMA): detection of low-surface-brightness galaxies from SDSS data

Williams, RP and Baldry, IK and Kelvin, LS and James, PA and Driver, SP and Prescott, M and Brough, S and Brown, MJI and Davies, LJM and Holwerda, BW and Liske, J and Norberg, P and Moffett, AJ and Wright, AH (2016) Galaxy And Mass Assembly (GAMA): detection of low-surface-brightness galaxies from SDSS data. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711

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Abstract

We report on a search for new low-surface-brightness galaxies (LSBGs) using Sloan Digital Sky Survey (SDSS) data within the GAMA equatorial fields. The search method consisted of masking objects detected with SDSS photo, combining gri images weighted to maximise the expected signal-to-noise ratio (SNR), and smoothing the images. The processed images were then run through a detection algorithm that finds all pixels above a set threshold and groups them based on their proximity to one another. The list of detections was cleaned of contaminants such as diffraction spikes and the faint wings of masked objects. From these, selecting potentially the brightest in terms of total flux, a list of 343 LSBGs was produced having been confirmed using VISTA Kilo-degree Infrared Galaxy Survey (VIKING) imaging. The photometry of this sample was refined using the deeper VIKING Z band as the aperture-defining band. Measuring their $g-i$ and $J-K$ colours shows that most are consistent with being at redshifts less than 0.2. The photometry is carried out using an AUTO aperture for each detection giving surface brightnesses of $\mu_{r} \ge 25 \, \mathrm{mag} \, \mathrm{arcsec}^{-2}$ and magnitudes of $r > 19.8$ mag. None of these galaxies are bright enough to be within the GAMA main survey limit but could be part of future deeper surveys to measure the low-mass end of the galaxy stellar mass function.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.IM
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 08 Sep 2016 10:24
Last Modified: 07 Sep 2017 13:15
DOI or Identification number: 10.1093/mnras/stw2185
URI: http://researchonline.ljmu.ac.uk/id/eprint/4105

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