J/MNRAS/482/1427 Velocity dispersions for CALIFA Galaxies (Gilhuly+, 2019)
Pipe3D stellar and gaseous velocity dispersions for CALIFA Galaxies.
Gilhuly C., Courteau S., Sanchez S.F.
<Mon. Not. R. Astron. Soc., 482, 1427-1434 (2019)>
=2019MNRAS.482.1427G 2019MNRAS.482.1427G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Velocity dispersion ; Photometry, H-alpha
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: kinematics and dynamics - galaxies: spiral
Abstract:
We present tables of velocity dispersions derived from CALIFA V1200
datacubes using PIPE3D. Four different dispersions are extracted from
emission (ionized gas) or absorption (stellar) spectra, with two
spatial apertures (5 and 30arcsec). Stellar and ionized gas
dispersions are not interchangeable and we determine their
distinguishing features. We also compare these dispersions with
literature values and construct sample scaling relations to further
assess their applicability. We consider revised velocity-based scaling
relations using the virial velocity parameter
S2K=KV2rot+σ2 constructed with each of our
dispersions. Our search for the strongest linear correlation between
SK and i-band absolute magnitudes favours the common K∼0.5, though
the range 0.3-0.8 is statistically acceptable. The reduction of
scatter in our best stellar mass-virial velocity relations over that
of a classic luminosity-velocity relation is minimal; this may however
reflect the dominance of massive spirals in our sample.
Description:
Our investigation of galaxy emission and absorption velocity
dispersions takes advantage of the third CALIFA data release,
employing a size-selected sample spanning a variety of environments in
the local universe (out to z∼0.03 for the main sample). Observations
were carried out at the Calar Alto Observatory with the Potsdam Multi
Aperture Spectrograph (PMAS) in the PPAK mode. The central hexagonal
bundle contains 331 fibres, each 2.7arcsec in diameter, with a total
field of view of 74x64arcsec. An additional 36 fibres in bundles of 6
cover the sky background. A three-pointing dithering pattern was used
to cover the gaps between the fibres and increase the final resolution
of the reduced datacubes to approximately 2.5arcsec (1kpc at the
average redshift of CALIFA galaxies). The typical seeing was 1arcsec
FWHM. There are two low- and medium-spectral resolution observing
modes for CALIFA: V500 and V1200 (for grisms with 500 lines/mm and
1200 lines/mm, respectively). The low-resolution V500 observations
span 3745-7300Å with R∼850 at 5000Å. The medium-resolution V1200
observations span 3400-4750Å with R∼1650 at 4500Å. A total of
667 galaxies were included in the third and final CALIFA data release
(Sanchez et al. 2012A&A...538A...8S 2012A&A...538A...8S, 2016A&A...594A..36S 2016A&A...594A..36S, Cat.
J/A+A/594/A36, 2017MNRAS.469.2121S 2017MNRAS.469.2121S, Cat. J/MNRAS/469/2121).
We have used PIPE3D (Sanchez et al. 2016RMxAA..52...21S 2016RMxAA..52...21S,
2016RMxAA..52..171S 2016RMxAA..52..171S) to extract our measurements of stellar and
gaseous dispersions for CALIFA galaxies. PIPE3D yields eight different
velocity dispersion measurements. These can be derived from either
V500 or V1200 observations, fitted either in absorption (tracing
stars) or in emission (tracing ionized gas), and measured either
within a 5 arcsec diameter aperture or a 30 arcsec diameter aperture.
For the gaseous velocity dispersions, the V500 lines of choice are
[OIII] and Hα whereas the V1200 sampling favours Hδ. We
focus on the V1200-based dispersion measurements, as the lower
resolution V500-based dispersions are unreliable, especially at lower
values as a result of the relatively significant instrumental
dispersion of this observing mode. These dispersions were extracted by
one of us (SFS) and are presented in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 208 545 Table of V1200 velocity dispersions produced
using FIT3D
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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- 22 A22 --- Name CALIFA name
24- 37 F14.10 km/s Vdisp5 5 arcsec aperture stellar velocity dispersion
39- 53 F15.10 km/s e_Vdisp5 Error on Vdisp5
55- 68 F14.10 km/s Vdisp30 30 arcsec aperture stellar velocity dispersion
70- 84 F15.10 km/s e_Vdisp30 Error on Vdisp30
86- 99 F14.10 km/s Vdisp5Hd 5 arcsec aperture Hδ velocity dispersion
101-113 F13.10 km/s e_Vdisp5Hd Error on Vdisp5Hb
115-128 F14.10 km/s Vdisp30Hd 30 arcsec aperture Hδ velocity
dispersion
130-142 F13.10 km/s e_Vdisp30Hd Error on Vdisp30Hb
144-158 F15.10 mW/m2 FluxHa5 5 arcsec aperture Hα Flux
160-174 F15.10 mW/m2 e_FluxHa5 Error on HaFlux5
176-191 F16.10 mW/m2 FluxHa30 30 arcsec aperture Hα Flux
193-208 F16.10 mW/m2 e_FluxHa30 Error on HaFlux30
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 27-Jun-2022