J/MNRAS/500/2049 The quiescent fraction of isolated LSBGs (Prole+, 2021)
The quiescent fraction of isolated low surface brightness galaxies:
observational constraints.
Prole D.J., van der Burg R.F.J., Hilker M., Spitler L.R.
<Mon. Not. R. Astron. Soc., 500, 2049-2062 (2021)>
=2021MNRAS.500.2049P 2021MNRAS.500.2049P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, dwarf ; Colors ; Photometry ; Optical
Keywords: galaxies: abundances - galaxies: dwarf - galaxies: evolution
Abstract:
Understanding the formation and evolution of low surface brightness
galaxies (LSBGs) is critical for explaining their wide-ranging
properties. However, studies of LSBGs in deep photometric surveys are
often hindered by a lack of distance estimates. In this work, we
present a new catalogue of 479 LSBGs, identified in deep optical
imaging data from the Hyper Suprime-Cam Subaru Strategic Program
(HSC-SSP). These galaxies are found across a range of environments,
from the field to groups. Many are likely to be ultra-diffuse galaxies
(UDGs). We see clear evidence for a bimodal population in
colour-Sersic index space, and split our sample into red and blue LSBG
populations. We estimate environmental densities for a sub-sample of
215 sources by statistically associating them with nearby
spectroscopic galaxies from the overlapping GAMA spectroscopic survey.
We find that the blue LSBGs are statistically consistent with being
spatially randomized with respect to local spectroscopic galaxies,
implying they exist predominantly in low-density environments.
However, the red LSBG population is significantly spatially correlated
with local structure. We find that 26±5 per cent of isolated, local
LSBGs belong to the red population, which we interpret as quiescent.
This indicates that high environmental density plays a dominant, but
not exclusive, role in producing quiescent LSBGs. Our analysis method
may prove to be very useful, given the large samples of LSB galaxies
without distance information expected from e.g. the Vera C. Rubin
observatory (aka LSST), especially in combination with upcoming
comprehensive wide-field spectroscopic surveys.
Description:
We use the calibrated co-added grizy images provided in the second
public data release (PDR2-wide) of the Hyper Suprime-Cam Subaru
Strategic Program (HSC-SSP) survey data (Aihara et al.
2019PASJ...71..114A 2019PASJ...71..114A) to produce a new catalogue of LSB galaxy
candidates for this study. In particular, we use the r-band for source
detection, in-keeping with similar studies (van der Burg et al.
2017A&A...607A..79V 2017A&A...607A..79V; Prole et al. 2019MNRAS.488.2143P 2019MNRAS.488.2143P). The data are
already split into discrete patches approximately 12arcminx12arcmin in
size, with 0.168arcsec pixels. The average r-band seeing is
0.76arcsec. The data set has been reduced with an improved background
subtraction algorithm compared to the previous release, meaning LSB
structure is well preserved over ∼arcminute scales. The HSC data is
roughly half a magnitude deeper than the comparable Kilo-Degree Survey
(KiDS; de Jong et al. 2013ExA....35...25D 2013ExA....35...25D) in the r band.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 199 479 Source catalogue
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [0/478] Internal object identifier
5- 22 F18.14 deg RAdeg Right ascension (J2000)
24- 45 F22.19 deg DEdeg Declination (J2000)
47- 64 F18.16 arcsec Rec Circularized effective radius
66- 84 F19.17 --- n Sersic index
86- 103 F18.15 mag/arcsec2 mueff Mean surface brightness within one
effective radius
105- 123 F19.17 --- axrat Axis ratio
125- 143 F19.17 mag g-r g-r colour
145 A1 --- f_r-i [*] Flag on r-i (1)
147- 167 F21.18 mag r-i ? r-i colour
169- 187 F19.16 --- weight Inverse of the recovery efficiency (2)
189- 193 A5 --- isred [True /False] Indicates whether the
source belongs to the red LSBG
population
195- 199 A5 --- inGAMA [True /False] Indicates whether the
source is contained within the
overlapping GAMA footprint
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Note (1): Flag as follows:
* = Indicates a value -inf was assigned to the r-i colour in the original
table
Note (2): The recovery efficiency is defined as the fraction of sources
intrinsically meeting the selection criteria that survive in the
final source catalogue.
See section 3.2.1 of the article for information regarding the
calculation of the recovery efficiency.
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 03-Oct-2023