J/MNRAS/496/2516 HI angular momentum on late-type galaxies (Murugeshan+, 2020)
The influence of angular momentum and environment on the HI gas of late-type
galaxies.
Murugeshan C., Kilborn V., Jarrett T., Wong O.I., Obreschkow D.,
Glazebrook K., Cluver M.E., Fluke C.J.
<Mon. Not. R. Astron. Soc., 496, 2516-2529 (2020)>
=2020MNRAS.496.2516M 2020MNRAS.496.2516M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; H I data ; Star Forming Region ; Spectra, radio
Keywords: galaxies: evolution; galaxies: fundamental parameters; galaxies: ISM
galaxies: kinematics and dynamics
Abstract:
We use high-resolution HI data from the Westerbork HI Survey of Spiral
and Irregular Galaxies (WHISP) to study the HI and angular momentum
properties of a sample of 114 late-type galaxies. We explore the
specific baryonic angular momentum-baryonic mass (jb-Mb) relation,
and find that an unbroken power law of the form
jb∝Mb0.55±0.02 fits the data well, with an intrinsic
scatter of ∼0.13±0.01dex. We revisit the relation between the atomic
gas fraction, fatm, and the integrated atomic stability parameter q
(the fatm-q relation), originally introduced by Obreschkow et al.
(2016ApJ...824L..26O 2016ApJ...824L..26O), and probe this parameter space by populating it
with galaxies from different environments, in order to study the
influence of the environment on their jb, fatm, and q values. We
find evidence that galaxies with close neighbours show a larger
intrinsic scatter about the fatm-q relation compared to galaxies
without close neighbours. We also find enhanced star formation rate
among the deviating galaxies with close neighbours. In addition, we
use the bulge-to-total (B/T) ratio as a morphology proxy, and find a
general trend of decreasing B/T values with increasing disc stability
and HI fraction in the fatm-q plane, indicating a fundamental link
between mass, specific angular momentum, gas fraction, and morphology
of galaxies.
Description:
The WHISP survey is one of the largest resolved HI surveys to date,
with high-resolution data available for over 400 galaxies. The
galaxies in the original WHISP sample were selected from the Uppsala
General Catalogue of Galaxies (UGC; Nilson 1973ugcg.book.....N 1973ugcg.book.....N), and
observed with the Westerbork Synthesis Radio Telescope (WSRT) with a
synthesized beam ∼14x14arcsec2/sinδ. The target galaxies were
required to have D25>1.5arcmin (where D25 is the B-band isophotal
diameter at 25mag/arcsec2), with declinations north of 20° and
additionally have HI peak flux densities >100mJy.
For this work, we make use of the 30arcsec resolution data cubes (see
Swaters et al. 2002A&A...390..829S 2002A&A...390..829S), with typical velocity resolutions
of ∼5km/s. From the primary sample, we selected galaxies with HI disc
radius spanning at least five resolution elements. This ensures that
there are enough resolution elements to accurately fit 3D tilted-ring
models to the galaxies and extract their kinematic properties. In
addition, we selected only those galaxies with inclination angles
between 20° and 80°, to avoid highly face-on and edge-on
systems. The final sample consists of 114 galaxies, listed in Table
A1.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 113 114 The galaxy sample
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Galaxy name (UGCNNNNN)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 37 F4.1 Mpc Dist Galactocentric distance
39- 44 F6.1 km/s Vsys Systemic velocity
46- 49 F4.1 deg i Inclination angle of the galaxy
51- 55 F5.1 km/s Vmax ? Maximum rotation velocity
57- 60 F4.1 km/s sigHI Median of the HI dispersion velocity from
the 3D fit
62- 66 F5.2 [Msun] logMass Logarithm of the stellar mass
68- 72 F5.2 [Msun] logMHI Logarithm of the HI mass
74- 78 F5.2 [Msun] logMH2 Logarithm of the H2 mass
80- 84 F5.2 [Msun] logMb Logarithm of the baryonic mass
86- 92 F7.2 kpc.km/s jb Baryonic angular momentum
94- 97 F4.2 --- fatm Atomic gas fraction (1)
99- 102 F4.2 --- q Integrated atomic stability parameter (2)
104- 108 F5.2 [Msun/yr] logSFR ? Logarithm of the star formation rate
from Jarrett et al. (2019ApJS..245...25J 2019ApJS..245...25J)
110- 113 F4.2 --- B/T ? Bulge to total ratio derived using WISE
W1 3.4-µm mosaics
--------------------------------------------------------------------------------
Note (1): fatm=1.35MHI/Mb
Note (2): q=jbσ/GMb
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 30-Jun-2023