J/MNRAS/456/1607 LSBVCC galaxy sample (Davies+, 2016)
Probing the low surface brightness dwarf galaxy population of the Virgo cluster.
Davies J.I., Davies L.J.M., Keenan O.C.
<Mon. Not. R. Astron. Soc., 456, 1607-1617 (2016)>
=2016MNRAS.456.1607D 2016MNRAS.456.1607D (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry
Keywords: galaxies: clusters individual: Virgo - galaxies: dwarf
Abstract:
We have used data from the Next Generation Virgo Survey to investigate
the dwarf galaxy population of the Virgo cluster. We mask and smooth
the data, and then use the object detection algorithm SExtractor to
make our initial dwarf galaxy selection. All candidates are then
visually inspected to remove artefacts and duplicates. We derive
parameters to best select low surface brightness galaxies using
central surface brightness values of 22.5≤µg0≤26.0µg and
exponential scale lengths of 3.0≤h≤10.0-arcsec to identify
443 cluster dwarf galaxies - 303 of which are new detections, with a
surface density that decreases with radius from the cluster centre. We
also apply our selection algorithm to 'background', non-cluster,
fields and find zero detections. In combination, this leads us to
believe that we have isolated a cluster dwarf galaxy population. The
range of objects we detect is limited because smaller scale sized
galaxies are confused with the background, while larger galaxies are
split into numerous smaller objects by the detection algorithm.
Combining our data with that from other surveys, we find a faint-end
slope to the luminosity function of -1.35±0.03, which is not
significantly different to what has previously been found, but is a
little steeper than the slope for field galaxies. There is no evidence
for a faint-end slope steep enough to correspond with galaxy formation
models, unless those models invoke either strong feedback processes or
use warm dark matter.
Description:
The NGVS data offer the opportunity to investigate the LSB dwarf
galaxy population of the Virgo cluster to surface brightness levels
never before investigated. However, we are hampered by an inherent
difficulty in separating cluster galaxies from background galaxies and
a detection method that is not suited to the detection of extended LSB
sources.
Given the limited area of the CSB-magnitude plane explored we have
found 303 new Virgo cluster LSB dwarf galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 443 The LSBVCC galaxy sample
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See also:
VII/266 : Atlas of Virgo galaxies (McDonald+ 2011)
J/A+A/343/86 : Virgo cluster radio luminosity function. I. (Gavazzi+ 1999)
J/A+A/396/449 : Hα surface photometry in Virgo (Gavazzi+, 2002)
J/A+A/417/499 : Spectrophotometry of Virgo cluster galaxies (Gavazzi+, 2004)
J/A+A/590/A27 : CO spectra of Virgo cluster galaxies (Grossi,+, 2016)
J/ApJS/215/22 : The Extended Virgo Cluster Catalog (EVCC) (Kim+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [LSBVCC]
7- 9 I3 --- LSBVCC LSBVCC identification number
11- 12 I2 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 20 F4.1 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 37 F4.1 mag gmag CFHT g band apparent magnitude
39- 42 F4.1 mag/arcsec2 SuBrg g band central surface brightness
44- 46 F3.1 arcsec SLg g band exponential scale length
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Aug-2016