J/MNRAS/519/318 H I gas properties in paired galaxies with WALLABY (Kim+, 2023)
WALLABY Pilot Survey H I gas kinematics of galaxy pairs in cluster environment.
Kim S.-J., Oh S.-H., Wang J., Staveley-Smith L., Koribalski B.S., Kim M.,
Park H.-J., Kim S., Spekkens K., Westmeier T., Wong O.I., Meurer G.R.,
K.P., Catinella B., Mcquinn K.B.W., Bigiel F., Holwerda B.W., Rhee J.,
Lee-Waddell K., Deg N., Verdes-Montenegro L., For B.-Q., Madrid J.P.,
Denes H., Elagali A.
<Mon. Not. R. Astron. Soc. 519, 318-339 (2023)>
=2023MNRAS.519..318K 2023MNRAS.519..318K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Radio lines ; Clusters, galaxy ; H I data ;
Interferometry ; Spectroscopy ; Positional data ; Line Profiles ;
Radial velocities ; Velocity dispersion
Keywords: ISM: kinematics and dynamics - galaxies: clusters: general -
galaxies: evolution - galaxies: groups: general -
galaxies: interactions
Abstract:
We examine the H I gas kinematics of galaxy pairs in two clusters and
a group using Australian Square Kilometre Array Pathfinder (ASKAP)
WALLABY pilot survey observations. We compare the H I properties of
galaxy pair candidates in the Hydra I and Norma clusters, and the NGC
4636 group, with those of non-paired control galaxies selected in the
same fields. We perform H I profile decomposition of the sample
galaxies using a tool, baygaud, which allows us to deblend a
line-of-sight velocity profile with an optimal number of Gaussian
components. We construct H I superprofiles of the sample galaxies via
stacking of their line profiles after aligning the central velocities.
We fit a double Gaussian model to the superprofiles and classify them
as kinematically narrow and broad components with respect to their
velocity dispersions. Additionally, we investigate the gravitational
instability of H I gas discs of the sample galaxies using Toomre Q
parameters and H I morphological disturbances. We investigate the
effect of the cluster environment on the H I properties of galaxy
pairs by dividing the cluster environment into three subcluster
regions (i.e. outskirts, infalling, and central regions). We find that
the denser cluster environment (i.e. infalling and central regions) is
likely to impact the H I gas properties of galaxies in a way of
decreasing the amplitude of the kinematically narrow H I gas
(MHInarrow/MHItotal), and increasing the Toomre Q values of
the infalling and central galaxies. This tendency is likely to be more
enhanced for galaxy pairs in the cluster environment.
Description:
We examine the resolved H I gas properties of close galaxy pairs in
two galaxy clusters (Hydra I and Norma), and a galaxy group (NGC 4636)
from ASKAP L-band WALLABY observations (i.e section 2). We perform
profile decomposition of H I velocity profiles using a new tool,
baygaud allows us to deblend a line-of-sight velocity profile with an
optimal number of Gaussian components based on Bayesian analysis
techniques. Based on spectral analysis in section 3, we provide for
Hydra I cluster, NGC 4636, Norma fields, H I properties and distances
of paired galaxies (i.e tablea1,a3,a5.dat) and control galaxies (i.e
tablea2,a4,a6.dat which do not satisfy the selection criteria and thus
have no close companions in their spatial and spectral vicinity).
Objects:
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RA (2000) DE Designation(s)
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10 36 36.00 -27 31 03.9 NAME Hydra I Cluster = 1E 1034.3-2716
12 42 49.50 +02 41 08.0 NAME NGC 4636 Group = 1ES 1240+02.9
16 14 22.49 -60 52 06.9 ACO 3627 = NAME Norma Cluster
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 94 111 The H I properties and distances of the control
galaxies in the ASKAP Hydra I cluster field
tablea3.dat 94 67 The H I properties and distances of the control
galaxies in the ASKAP NGC 4636 field
tablea5.dat 94 88 The HI properties and distances of the control
galaxies in the ASKAP Norma cluster field
tablea2.dat 102 29 The H I properties and distances of the paired
galaxies in the ASKAP Hydra I cluster field
tablea4.dat 102 8 The H I properties and distances of the paired
galaxies in the ASKAP NGC 4636 field
tablea6.dat 102 11 The H I properties and distances of the paired
galaxies in the ASKAP Norma cluster field
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See also:
J/MNRAS/510/1716 : Hydra I cluster study with H I emission (Reynolds+, 2022)
J/MNRAS/493/5089 : HI asymmetries with LVHIS, VIVA, and HALOGAS
(Reynolds+, 2020)
J/MNRAS/489/5723 : ASKAP HI imaging of the Lyon Group of Galaxies 351
(For+, 2019)
J/MNRAS/478/3447 : SDSS post-merger galaxies HI data (Ellison+, 2018)
J/MNRAS/460/2143 : HI size-mass relation of galaxies (Wang+, 2016)
J/MNRAS/436/34 : GALEX Arecibo SDSS survey. Final data release
(Catinella+, 2013)
J/MNRAS/416/2415 : Morphological parameters of WHISP galaxies (Holwerda+, 2011)
J/MNRAS/414/2005 : Cosmic flows observations (Courtois+, 2011)
J/MNRAS/400/1962 : Southern GEMS groups. II. (Kilborn+, 2009)
J/MNRAS/383/445 : Radial velocities in the Norma cluster (A3627) (Woudt+,2008)
J/A+A/631/A87 : Close pairs of galaxies in MUSE Deep Fields (Ventou+, 2019)
J/A+A/324/877 : HI properties of spiral and irregular galaxies
(Broeils+, 1997)
J/ApJ/915/70 : WALLABY pilot survey: HI gas in Hydra cluster (Wang+, 2021)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf galaxies
(Hunter+, 2012)
J/AJ/140/1194 : FUV/HI relations in nearby galaxies (Bigiel+, 2010)
J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)
J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)
J/AJ/129/682 : Structural properties of S+S galaxies
(Hernandez-Toledo+, 2005)
Byte-by-byte Description of file: tablea1.dat tablea3.dat tablea5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Name Source name designation as JHHMMSS-DDMMSS
(Name)
16 A1 --- f_Name Indicates the galaxy that have similar
velocity widths of the narrow and broad
components in the H I superprofile analysis
(flag)
18- 19 I2 h RAh Right ascension kinematic centre from 2dbat
(J2000)
21- 22 I2 min RAm Right ascension kinematic centre from 2dbat
(J2000)
24- 27 F4.1 s RAs Right ascension kinematic centre from 2dbat
(J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination kinematic centre from 2dbat
(J2000)
33- 34 I2 arcmin DEm Declination kinematic centre from 2dbat
(J2000)
36- 39 F4.1 arcsec DEs Declination kinematic centre from 2dbat
(J2000)
41- 45 F5.1 Mpc D Distance to the galaxy from redshift (D)
47- 53 F7.3 km/s Vsys Systemic velocity from redshift (Vsys)
55- 58 F4.1 kpc RHI Radius of H I disc from the baygaud
analysis (RrmHI)
60- 64 F5.1 Jy.km/s SHI Integrated H I intensities derived from
superprofiles in Section 3 (SHI)
66- 70 F5.1 10+8Msun MHI H I mass derived from superprofiles in
Section 3 as MHIn + MHIb (MHItotal)
72- 75 F4.1 10+8Msun MHIn Narrow H I mass derived from superprofiles
in Section 3 (MHInarrow)
77- 81 F5.1 10+8Msun MHIb Broad H I mass derived from superprofiles
in Section 3 (MHIbroad)
83- 86 F4.2 --- MorphHI ? HI morphological asymmetry of the galaxy
(AHImap)
88- 92 F5.2 --- Q ? Median values of the Toomre Q parameter
values of the galaxy (Q)
94 A1 --- f_Q Flag in Q (flag) (1)
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Note (1): Flag indicates "*" for MOMENT1 velocity field is used for the
rotation curve analysis.
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Byte-by-byte Description of file: tablea2.dat tablea4.dat tablea6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Name Source name designation as JHHMMSS-DDMMSS
(Name)
16 I1 --- f_Name ? Flag on galaxy (flag) (1)
18- 19 I2 h RAh Right ascension kinematic centre from 2dbat
(J2000)
21- 22 I2 min RAm Right ascension kinematic centre from 2dbat
(J2000)
24- 27 F4.1 s RAs Right ascension kinematic centre from 2dbat
(J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination kinematic centre from 2dbat
(J2000)
33- 34 I2 arcmin DEm Declination kinematic centre from 2dbat
(J2000)
36- 39 F4.1 arcsec DEs Declination kinematic centre from 2dbat
(J2000)
41- 44 F4.1 Mpc D Distance to the galaxy from redshift (D)
46- 52 F7.3 km/s Vsys Systemic velocity from redshift (Vsys)
54- 57 F4.1 kpc RHI Radius of H I disc from the baygaud
analysis (RrmHI)
59- 62 F4.1 Jy.km/s SHI Integrated H I intensities derived from
superprofiles in Section 3 (SHI)
64- 68 F5.1 10+8Msun MHI H I mass derived from superprofiles in
Section 3 as MHIn + MHIb (MHItotal)
70- 73 F4.1 10+8Msun MHIn Narrow H I mass derived from superprofiles
in Section 3 (MHInarrow)
75- 79 F5.1 10+8Msun MHIb Broad H I mass derived from superprofiles
in Section 3 (MHIbroad)
81- 85 A5 kpc Rp Projected distance to the companion galaxy
(Rp) (2)
87- 91 A5 km/s DV Relative line-of-sight velocity to the
companion galaxy (ΔV) (2)
93- 96 F4.2 --- MorphHI ? HI morphological asymmetry of the galaxy
(AHImap)
98- 102 F5.2 --- Q ? Median values of the Toomre Q parameter
values of the galaxy (Q)
--------------------------------------------------------------------------------
Note (1): Flag on galaxy is as follows:
1 = Indicates the visually identified galaxy pair,
5 sources in our sample
2 = Indicates the galaxy that have similar velocity widths of the
narrow and broad components in the H I suepr-profile analysis,
1 source in our sample
Note (2): For galaxies with two nearby companions, we provide two values
separated by '/'.
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History:
From electronic version of the journal
(End) Luc Trabelsi [CDS] 15-Jan-2026