J/MNRAS/476/3744 HIX galaxy survey. II. (Lutz+, 2018)
The HIX galaxy survey. II. H I kinematics of H I eXtreme galaxies.
Lutz K.A., Kilborn V.A., Koribalski B.S., Catinella B., Jozsa G.I.G.,
Wong O.I., Stevens A.R.H., Obreschkow D., Denes H.
<Mon. Not. R. Astron. Soc., 476, 3744-3780 (2018)>
=2018MNRAS.476.3744L 2018MNRAS.476.3744L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; H I data
Keywords: galaxies: evolution - galaxies: formation - galaxies: ISM -
galaxies: kinematics and dynamics
Abstract:
By analysing a sample of galaxies selected from the HI Parkes All Sky
Survey (HIPASS) to contain more than 2.5 times their expected HI
content based on their optical properties, we investigate what drives
these HI eXtreme (HIX) galaxies to be so HI-rich. We model the HI
kinematics with the Tilted Ring Fitting Code TiRiFiC and compare the
observed HIX galaxies to a control sample of galaxies from HIPASS as
well as simulated galaxies built with the semi-analytic model DARK
SAGE. We find that (1) HI discs in HIX galaxies are more likely to be
warped and more likely to host HI arms and tails than in the control
galaxies, (2) the average HI and average stellar column density of HIX
galaxies is comparable to the control sample, (3) HIX galaxies have
higher HI and baryonic specific angular momenta than control galaxies,
(4) most HIX galaxies live in higher spin haloes than most control
galaxies. These results suggest that HIX galaxies are HI-rich because
they can support more HI against gravitational instability due to
their high specific angular momentum. The majority of the HIX galaxies
inherits their high specific angular momentum from their halo. The HI
content of HIX galaxies might be further increased by gas-rich minor
mergers. This paper is based on data obtained with the Australia
Telescope Compact Array through the large program C2705.
Description:
Spatially resolved HI emission line observations (around 1.4GHz, 21cm)
with the Australian Telescope Compact Array (ATCA)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hix-2.dat 170 23 Basic properties and measurements for the HIX
and control galaxy sample
list.dat 147 23 List of datacubes
fits/* . 23 Individual datacubes
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See also:
J/MNRAS/467/1083 : HIX galaxy survey. I. (Lutz+, 2017)
Byte-by-byte Description of file: hix-2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Galaxy Name of the galaxy
13- 22 F10.6 deg RAdeg Rigth ascension from 2MASX (J2000)
24- 33 F10.6 deg DEdeg Declination from 2MASX (J2000)
35- 53 F19.15 Mpc Dist Distance based on recession velocity
55- 58 F4.1 [Msun] logMstar stellar mass
60- 63 F4.1 [Msun] logMHIh HI mass based on HIPASS data
65- 68 F4.1 [Msun] logMHIa HI mass based on ATCA data
70- 72 F3.1 kpc ReffK Ks band effective radius from 2MASX
(Skrutskie et al., 2006, Cat. VII/233)
converted to kpc assuming the distance above
74- 77 F4.1 kpc RHI 1M☉/pc2 isophotal radius of HI disc
79- 83 F5.1 km/s Vrot Rotation velocity from tilted ring models
85-103 F19.13 kpc.km/s jHI HI specific angular momentum
105-123 F19.14 kpc.km/s jstar Stellar specific angular momentum
125-142 F18.13 kpc.km/s jbary Baryonic specific angular momentum
144-148 F5.2 --- logq Stability parameter
150-153 F4.2 --- lambda Halo spin parameter
155 A1 --- H/c [H/c] Which sample does the galaxy belong to
(H=HIX, c=control)
157-170 A14 --- n_H/c Note on H/c
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Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Galaxy Name of the galaxy
13- 21 F9.5 deg RAdeg Right Ascension of center (J2000)
22- 30 F9.5 deg DEdeg Declination of center (J2000)
32- 34 I3 --- Nx Number of pixels along X-axis
36- 38 I3 --- Ny Number of pixels along Y-axis
40- 42 I3 --- Nz Number of pixels along Z-axis
44- 64 A21 "datime" Obs.date Observation date
66- 76 E11.6 m/s bVlsr Lower value of LSR velocity (FELO-LSR)
78- 88 E11.6 m/s BVlsr upper value of LSR velocity (FELO-LSR)
90- 96 F7.2 m/s dVlsr LSR velocity resolution
98-102 I5 Kibyte size Size of FITS file
104-119 A16 --- FileName Name of FITS file, in subdirectory fits
121-147 A27 --- Title Title of the FITS file
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Acknowledgements:
Katharina Lutz, katharina.lutz(at)astro.unistra.fr
References:
Lutz et al., Paper I 2017MNRAS.467.1083L 2017MNRAS.467.1083L, Cat. J/MNRAS/467/1083
(End) Patricia Vannier [CDS] 20-Aug-2019