J/MNRAS/465/3784 Very thin discs galaxies properties (Bizyaev+, 2017)
Very thin disc galaxies in the SDSS catalogue of edge-on galaxies.
Bizyaev D.V., Kautsch S.J., Sotnikova N.Y., Reshetnikov V.P., Mosenkov A.V.
<Mon. Not. R. Astron. Soc. 465, 3784-3792 (2017)>
=2017MNRAS.465.3784B 2017MNRAS.465.3784B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Morphology ; Radial velocities
Keywords: galaxies: evolution - galaxies: haloes - galaxies: spiral -
galaxies: structure
Abstract:
We study the properties of galaxies with very thin discs (VTDs) using
a sample of 85 objects whose stellar disc radial-to-vertical scale
ratio determined from photometric decomposition, exceeds 9. We present
evidences of similarities between the VTD galaxies and low surface
brightness (LSB) disc galaxies, and conclude that both small and giant
LSB galaxies may reveal themselves as VTD, edge-on galaxies. Our VTD
galaxies are mostly bulgeless, and those with large radial scalelength
tend to have redder colours. We performed spectral observations of 22
VTD galaxies with the Dual Imaging Spectrograph on the 3.5 m telescope
at the Apache Point Observatory. The spectra with good resolution
(R∼5000) allow us to determine the distance and the ionized gas
rotation curve maximum for the galaxies. Our VTD galaxies have low
dust content, in contrast to regular disc galaxies. Apparently, VTD
galaxies reside in specific cosmological low-density environments and
tend to have less connection with filaments. Comparing a toy model
that assumes marginally low star formation in galactic discs with
obtained gas kinematics data, we conclude that there is a threshold
central surface density of about 88M☉/pc2, which we observe in
the case of very thin, rotationally supported galactic discs.
Description:
The large sample of verified edge-on galaxies collected by EGIS
(Bizyaev et al., 2014, Cat. J/ApJ/787/24) allows us to select a
subsample of VTD galaxies large enough for statistical analysis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 85 Selected sample of VTD galaxies
table2.dat 45 24 Spectral observations of VTD galaxies
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See also:
J/ApJ/787/24 : Structural parameters of true edge-on galaxies (Bizyaev+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name EGIS Name
22- 26 F5.2 kpc h Radial scalelength
28- 32 F5.2 kpc z0 Verticel scaleheight
34- 37 F4.1 --- h/z0 Scale ratio
39- 44 F6.3 mag (r-i)0 Intergated colour index r-i
46 A1 --- Qual [YN] Quality flag (1)
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Note (1): Quality flag as follows:
Y = if the radial velocity of the galaxy was within the reasonable range
(between 0 and 30000km/s), and also if the galactic colour (r-i) was
reported in EGIS.
N = indicates that the spatial scales are incorrect, whereas the scale ratios
calculated from the angular values of the scales are right.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name EGIS Name
19 A1 --- n_Name [b] Note on Object (1)
21- 31 A11 "date" Date Observation date
33- 34 I2 min ExpTime Exposure time
36- 40 I5 km/s HRV Heliocentric Radial velocity
42- 44 I3 km/s Vmax Amplitude of the rotation curve
45 A1 --- n_Vmax [acd] note on Vmax (1)
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Note (1): Notes as follows:
a = No Hα line in the spectrum. A line identified as NaD absorption
is used.
c = No Hα line in the spectrum. A line identified as NaD absorption
is used.
b = Not a VTD galaxy, the h/z0 ratio is close to 6. Used for comparison
purposes.
d = Raising rotation curve with ring-like features.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Mar-2019