J/MNRAS/478/4657 Structural properties of faint LSB galaxies (Pahwa+, 2018)
Structural properties of faint low-surface-brightness galaxies.
Pahwa I., Saha K.
<Mon. Not. R. Astron. Soc., 478, 4657-4668 (2018)>
=2018MNRAS.478.4657P 2018MNRAS.478.4657P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Morphology
Keywords: galaxies: evolution - galaxies: photometry - galaxies: spiral -
galaxies: structure
Abstract:
We study the structural properties of Low-Surface-Brightness galaxies
(LSB) using a sample of 263 galaxies observed by the Green Bank
Telescope. We perform 2D decompositions of these galaxies in the Sloan
Digital Sky Survey g, r, and i bands using the GALFIT software. Our
decomposition reveals that about 60 per cent of these galaxies
are bulgeless i.e. their light distributions are well modelled by pure
exponential discs. The rest of the galaxies were fitted with two
components: a Sersic bulge and an exponential disc. Most of these
galaxies have bulge-to-total (B/T) ratio less than 0.1. However, of
these 104 galaxies, 20 per cent have B/T>0.1 i.e. hosting
significant bulge component and they are more prominent amongst the
fainter LSBs. According to g-r colour criteria, most of the LSB
galaxies in our sample are blue, with only 7 classified as red LSBs.
About 15 per cent of the LSB galaxies (including both blue and
red) in our sample host stellar bars. The incidence of bars is more
prominent in relatively massive blue LSB galaxies with very high gas
fraction. These findings may provide important clues to the formation
and evolution of LSB galaxies - in particular on the bar/bulge
formation in faint LSB discs.
Description:
We have studied a sample of 263 LSB galaxies observed by Green Bank
Telescope (Schneider et al. 1992) which are in overlap with the SDSS
footprint. We have performed two-component bulge-disc decomposition of
263 galaxies in the SDSS g, r and, i bands and investigated their
structural properties in detail.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
gband.dat 148 263 GALFIT g-band decomposition
rband.dat 148 263 GALFIT r-band decomposition
iband.dat 148 263 GALFIT i-band decomposition
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Byte-by-byte Description of file: gband.dat rband.dat iband.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- ID Galaxy ID (ANNN)
6- 24 I19 --- objID Galaxy SDSS objID
26- 34 F9.5 deg RAdeg Right ascension (J2000)
36- 43 F8.5 deg DEdeg Declination (J2000)
45- 52 F8.6 --- z Redshift
54- 57 I4 --- run SDSS run ID
59- 61 I3 --- rerun SDSS rerun ID
63 I1 --- camcol SDSS camcol ID
65- 67 I3 --- Field SDSS field ID
69- 74 F6.2 pix SersicX ?=0 Sersic profile for the bulge component
X position
76- 81 F6.2 pix SersicY ?=0 Sersic profile for the bulge component
Y position
83- 87 F5.2 mag Sersicmag ?=0 Sersic profile for the bulge component
magnitude in Band
89- 93 F5.2 kpc SersicRe ?=0 Sersic profile for the bulge component
effective radius
95- 98 F4.2 --- Sersicn ?=0 Sersic profile for the bulge component
Sersic number
100-103 F4.2 --- Sersicba ?=0 Sersic profile for the bulge component b/a
105-110 F6.2 deg SersicPA ?=0 Sersic profile for the bulge component
position angle
112-117 F6.2 pix ExpX Exponential profile for the disc component
X position
119-124 F6.2 pix ExpY Exponential profile for the disc component
Y position
126-130 F5.2 mag Expmag Exponential profile for the disc component
magnitude in Band
132-136 F5.2 kpc ExpRs Exponential profile for the disc component
scalelength of the stellar disc
138-141 F4.2 --- Expba Exponential profile for the disc component b/a
143-148 F6.2 deg ExpPA Exponential profile for the disc component
position angle
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Oct-2021