J/A+A/635/A69 HIX galaxy survey. III. (Lutz, 2020)
The H IX galaxy survey. III: The gas-phase metallicity in HI eXtreme galaxies.
Lutz K., Kilborn V., Catinella B., Cortese L., Brown T.H., Koribalski B.
<Astron. Astrophys. 635, A69 (2020)>
=2020A&A...635A..69L 2020A&A...635A..69L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; H I data
Keywords: galaxies: kinematics and dynamics - galaxies: abundances -
galaxies: ISM - galaxies: spirals - galaxies: evolution
Abstract:
This paper presents the analysis of optical integral field spectra for
the HI eXtreme (HIX) galaxy sample. HIX galaxies host at least 2.5
times more atomic gas (HI) than expected from their optical R-band
luminosity. Previous examination of their star formation activity and
HI kinematics suggested that these galaxies stabilise their large HI
discs (radii up to 94kpc) against star formation due to their higher
than average baryonic specific angular momentum. A comparison to
semi-analytic models further showed that the elevated baryonic
specific angular momentum is inherited from the high spin of the dark
matter host. In this paper we now turn to the gas-phase metallicity as
well as stellar and ionised gas kinematics in HIX galaxies to gain
insights on recent accretion of metal-poor gas or recent mergers. To
do so we compare the stellar, ionised and atomic gas kinematics, and
examine the variation of the gas-phase metallicity throughout the
stellar disc of HIX galaxies. We find no indication for
counter-rotation in any of the components, the central metallicities
tend to be lower than average but as low as expected for galaxies of
similar HI mass. Metallicity gradients are comparable to other less
HI-rich, local star forming galaxies. We conclude that HIX galaxies
show no conclusive evidence for recent major accretion or merger
events. Their overall lower metallicities are likely due to them
living in high spin halos, which slows down their evolution and thus
enrichment of their interstellar medium.
Description:
WiFeS (on ANU 2.3m telescope in Siding Springs Observatory, Australia)
IFU spectra for HI-rich galaxies, data were taken between August 2014
and April 2016.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hix-3.dat 85 13 HIX III galaxy sample
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See also:
J/MNRAS/467/1083 : HIX galaxy survey. I. (Lutz+, 2017)
J/MNRAS/476/3744 : HIX galaxy survey. II. (Lutz+, 2018)
Byte-by-byte Description of file: hix-3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name
13- 20 F8.4 deg RAdeg 2MASX Right ascension (J2000)
22- 29 F8.4 deg DEdeg 2MASX Declination (J2000)
31- 33 I3 Mpc Dist Luminosity Distance based on HIPASS
systemic velocity
35- 38 F4.1 [Msun] logMstar Stellar mass from 2MASX K-band luminosity
(using Wen et al. (2013MNRAS.433.2946W 2013MNRAS.433.2946W)
calibration)
40- 43 F4.1 [Msun] logMHI HI mass from ATCA measurements
45- 48 F4.1 kpc RHI HI 1M☉/pc2 isophotal radius
50- 53 F4.1 kpc R25 Optical 25mag/arcsec2 isophotal radius
from ESO-LV catalogue
55- 59 I5 km/s Vsys Systemic velocity from kinematic models
61- 63 I3 km/s W50 HIPASS velocity width
65- 67 I3 km/s Vrot Rotation velocity from kinematic models
69- 71 A3 --- WiFeSobs? [No Yes] Are there optical integral field
spectra from WiFeS IFU available?
73 A1 --- H/c [Hc] Is this galaxy a HIX (H) or
control (c) galaxy?
75- 78 F4.2 --- 12+logO/H ? Central gas-phase metallicity (using
Pettini & Pagel (2004MNRAS.348L..59P 2004MNRAS.348L..59P)
O3N2 method)
80- 85 F6.3 1/kpc grad12+logO/H ? Gradient of gas-phase metallicity across
the optical disc (gradient 12+log O/H)
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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
Lutz et al., Paper II 2018MNRAS.476.3744L 2018MNRAS.476.3744L, Cat. J/MNRAS/476/3744
(End) Patricia Vannier [CDS] 03-Jan-2020