J/ApJ/898/102 Rotation velocity & dynamical mass of gal. from HI sp. (Yu+, 2020)
On the determination of rotation velocity and dynamical mass of galaxies based
on integrated HI spectra.
Yu N., Ho L.C., Wang J.
<Astrophys. J., 898, 102 (2020)>
=2020ApJ...898..102Y 2020ApJ...898..102Y
ADC_Keywords: Galaxies, spectra; Radio lines; Redshifts; Rotational velocities;
Stars, masses; Line Profiles
Keywords: Galaxies ; Interstellar medium ; H I line emission ; Galaxy dynamics ;
Galaxy kinematics
Abstract:
The integrated 21cm HI emission profile of a galaxy encodes valuable
information on the kinematics, spatial distribution, and dynamical
state of its cold interstellar medium. The line width, in particular,
reflects the rotation velocity of the galaxy, which, in combination
with a size scale, can be used to constrain the dynamical mass of the
system. We introduce a new method based on the concept of the curve of
growth to derive a set of robust parameters to characterize the line
width, asymmetry, and concentration of the integrated HI spectra. We
use mock spectra to evaluate the performance of our method, to
estimate realistic systematic uncertainties for the proposed
parameters, and to correct the line widths for the effects of
instrumental resolution and turbulence broadening. Using a large
sample of nearby galaxies with available spatially resolved
kinematics, we demonstrate that the newly defined line widths can
predict the rotational velocities of galaxies to within an accuracy of
≲30km/s. We use the calibrated line widths, in conjunction with the
empirical relation between the size and mass of HI disks, to formulate
a prescription for estimating the dynamical mass within the
HI-emitting region of gas-rich galaxies. Our formalism yields
dynamical masses accurate to ∼0.3dex based solely on quantities that
can be derived efficiently and robustly from current and future
extragalactic HI surveys. We further extend the dynamical mass
calibration to the scale of the dark matter halo.
Description:
Our primary sample derives from the work of
Wang+ (2016, J/MNRAS/460/2143), who compiled data from 15 HI
interferometric projects for 549 nearby galaxies covering over 5 orders
of magnitudes in HI mass and more than 10 optical magnitudes. After
removing redundant sources, the initial sample contains 469 unique
galaxies.
Making extensive use of the NASA/IPAC Extragalactic Database (NED), we
located published single-dish HI spectra for 387 of the 469 galaxies
from the initial sample. See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 127 269 Basic properties of the sample;
from erratum published in 2020, ApJ, 902, 88
table4.dat 129 269 Physical parameters derived from the HI spectra
from erratum published in 2020, ApJ, 902, 88
refs.dat 68 54 References
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See also:
VII/238 : HYPERLEDA. II. Homogenized HI data (Paturel+, 2003)
VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004)
VIII/77 : HI spectral properties of galaxies (Springob+, 2005)
VIII/89 : Northern HI Parkes All Sky Survey Catalogue (HIPASS) (Wong+, 2006)
J/A+AS/102/57 : Radial Velocities of the local universe (Bottinelli+ 1993)
J/A+A/324/877 : HI properties of spiral and irregular gal. (Broeils+, 1997)
J/A+A/370/765 : HI synthesis observations in UMa cluster (Verheijen+, 2001)
J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002)
J/AJ/128/16 : HIPASS Bright Galaxy Catalog (Koribalski+, 2004)
J/A+A/438/507 : Degree of lopsidedness for galaxies (Bournaud+, 2005)
J/A+A/435/459 : HI data of edge-on spiral galaxies (Huchtmeier+, 2005)
J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005)
J/ApJS/177/103 : HI survey of AGNs (Ho+, 2008)
J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)
J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)
J/AJ/138/1938 : EDD: All Digital HI profile catalog (Courtois+, 2009)
J/MNRAS/394/340 : SDSS phot. of HI-selected galaxies (Garcia-Appadoo+, 2009)
J/PASP/122/1397 : Spitzer Survey of Stellar Structure in Gal. (Sheth+, 2010)
J/MNRAS/414/2005 : Cosmic flows observations (Courtois+, 2011)
J/AJ/142/170 : ALFALFA survey: α.40 HI source cat. (Haynes+, 2011)
J/ApJS/197/22 : The Carnegie-Irvine Galaxy Survey (GGS). II. (Li+, 2011)
J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf gal. (Hunter+, 2012)
J/AJ/144/16 : Opt. and HI properties of galaxies in voids (Kreckel+, 2012)
J/A+A/566/A71 : HI study of 18 nearby dwarf galaxies (Lelli+, 2014)
J/MNRAS/443/1044 : GBT HI observations of 1194 spirals (Masters+, 2014)
J/AJ/152/157 : Mass models for 175 disk galaxies with SPARC (Lelli+, 2016)
J/MNRAS/460/2143 : HI size-mass relation of galaxies (Wang+, 2016)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
J/MNRAS/478/1611 : Local Volume H I Survey (LVHIS) (Koribalski+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Galaxy name
18- 26 F9.5 deg RAdeg Right Ascension, decimal degrees (J2000)
28- 36 F9.5 deg DEdeg Declination, decimal degrees (J2000)
38- 39 I2 --- Type [-3/10] Morphological type index
from HyperLeda
41- 49 F9.6 --- z [-0.0008/0.03] Optical redshift from NED
51- 55 F5.1 Mpc DistL [0.9/131] Luminosity distance from
Wang+ (2016, J/MNRAS/460/2143)
57- 59 I3 km/s Vrot [5/300] Deprojected rotation velocity
from the literature
61- 62 I2 km/s e_Vrot [1/45] Uncertainty in Vrot
64- 65 I2 deg incRef [5/90]? Inclination angle
from the literature
67- 70 F4.2 --- q [0.12/1.0] Optical axis ratio
72- 75 F4.2 --- e_q [0.01/0.14] Uncertainty in q
77 A1 --- l_logM Limit flag on logM
78- 81 F4.1 [Msun] logM [5.5/11.3] log of stellar mass
derived in this work
83- 84 I2 deg inc [0/90] Inclination angle derived in this work
86- 87 I2 deg e_inc [5/30] Uncertainty in inc
89- 94 F6.1 km/s VcRef [-221/8947] Central velocity
from the literature
96-100 F5.1 Jy.km/s Fref [0.6/288.6]? Total integrated H I flux
102-105 F4.1 km/s vinst [2.8/30] Instrumental velocity resolution
107-108 A2 --- l_logM200 [≤ ] Limit flag for logM200
110-113 F4.1 [Msun] logM200 [8.4/13.8]? Total mass inside r200
derived from mass model
115-118 F4.1 [Msun] e_logM200 [0/15]? Uncertainty in logM200
120-121 A2 --- r_Vrot Reference for Vrot & incRef
(see refs.dat file)
123-124 A2 --- Ref Reference for VcRef, FRef, vinst
(see refs.dat file)
126-127 A2 --- r_logM200 Reference for logM200 (see refs.dat file)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Galaxy name
18- 21 I4 km/s Vc [-199/8949] Flux intensity-weighted central
velocity
23- 24 I2 km/s e_Vc [2/27] Uncertainty in Vc
26- 31 F6.2 Jy.km/s FHI [0.69/291] Total integrated flux of H I line
33- 37 F5.2 Jy.km/s e_FHI [0.15/46] Uncertainty in FHI
39- 41 I3 km/s V95c [6/485]? Corrected line width measured
at 95% flux
43- 44 I2 km/s e_V95c [3/76]? Uncertainty in V95c
46- 48 I3 km/s V85c [5/357]? Corrected line width measured
at 85% flux
50- 51 I2 km/s e_V85c [1/55]? Uncertainty in V85c
53- 55 I3 km/s V75c [6/314]? Corrected line width measured
at 75% flux
57- 58 I2 km/s e_V75c [0/45]? Uncertainty in V75c
60- 62 I3 km/s V65c [7/282]? Corrected line width measured
at 65% flux
64- 65 I2 km/s e_V65c [0/39]? Uncertainty in V65c
67- 70 F4.2 --- A-F [1/1.7] Corrected flux asymmetry
72- 75 F4.2 --- e_A-F [0.07/0.5] Uncertainty in A-F
77- 80 F4.2 --- A-C [1/3.15] Corrected concentration asymmetry
82- 85 F4.2 --- e_A-C [0.1/3.2] Uncertainty in A-C
87- 90 F4.2 --- C-V [2/6] Corrected concentration of HI profile
92- 95 F4.2 --- e_C-V [0.2/4.3] Uncertainty in C-V
97-102 A6 --- SNR SNR of the profile
104-108 F5.2 [Msun] logMHI [6.3/10.52] HI mass
110-113 F4.2 [Msun] e_logMHI [0.13/0.14] Uncertainty in logMHI (1)
115-119 F5.2 [Msun] logMdyn [7.5/12.1]? Dynamical mass, Equation 12
121-124 F4.2 [Msun] e_logMdyn [0.14/1]? Uncertainty in logMdyn (2)
126-129 A4 --- Note Note(s) (3)
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Note (1): if we assume an uncertainty in the distance of 10% and a flux
uncertainty of 15%, the typical uncertainty of logMHI is 0.13dex.
Note (2): the typical uncertainty is 0.23dex, taking into consideration the
uncertainties of MHI , V85c , and inc.
Note (3): Note as follows:
1 = mask generated for the spectrum;
2 = baseline subtracted in this work.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode of the reference
24- 46 A23 --- Auth Author of the reference
48- 68 A21 --- Cat VizieR catalog reference
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History:
From electronic version of the journal
In erratum 2020 ApJ 902 88; logM, inc and e_inc replaced for Table 1 and
V95c, V85c, V75c and V65c with associated uncertainties replaced
for Table 4.
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Nov-2021