J/MNRAS/477/4187 Mass models of 171 galaxies (Haghi+, 2018)
Rotation curves of galaxies and the stellar mass-to-light ratio.
Haghi H., Khodadadi A., Ghari A., Hasani Zonoozi A., Kroupa P.
<Mon. Not. R. Astron. Soc., 477, 4187-4199 (2018)>
=2018MNRAS.477.4187H 2018MNRAS.477.4187H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Morphology
Keywords: methods: numerical
Abstract:
Mass models of a sample of 171 low- and high-surface brightness
galaxies are presented in the context of the cold dark matter (CDM)
theory using the NFW dark matter halo density distribution to extract
a new concentration-viral mass relation (c-Mvir). The rotation
curves (RCs) are calculated from the total baryonic matter based on
the 3.6µm-band surface photometry, the observed distribution of
neutral hydrogen, and the dark halo, in which the three adjustable
parameters are the stellar mass-to-light ratio, halo concentration,
and virial mass. Although accounting for a NFW dark halo profile can
explain RC observations, the implied c-Mvir relation from RC
analysis strongly disagrees with that resulting from different
cosmological simulations. Also, the M/L-colour correlation of the
studied galaxies is inconsistent with that expected from stellar
population synthesis models with different stellar initial mass
functions. Moreover, we show that the best-fitting stellar M/L ratios
of 51 galaxies (30 per cent of our sample) have unphysically negative
values in the framework of the ΛCDM theory. This can be
interpreted as a serious crisis for this theory. This suggests either
that the commonly used NFW halo profile, which is a natural result of
ΛCDM cosmological structure formation, is not an appropriate
profile for the dark haloes of galaxies, or, new dark matter physics
or alternative gravity models are needed to explain the rotational
velocities of disc galaxies.
Description:
We used RCs from the SPARC data set which is compiled from the
literature by Lelli, McGaugh & Schombert (2016AJ....152..157L 2016AJ....152..157L,
Cat.J/AJ/152/157). The sample includes a collection of 171 galaxies,
spans a wide range of K-band luminosities from 3x107 to
3x1011L☉, K and morphological types, from gas-dominated
low-surface brightness galaxies (e.g. DDO 154 and IC 2574) to
high-surface brightness galaxies with a massive stellar component and
a low gas content with well-extended RCs (e.g. NGC 5033).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 140 171 The results for RC fits with assuming NFW halo
profiles
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See also:
J/AJ/152/157 : Mass models for 175 disk galaxies with SPARC (Lelli+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Galaxy Galaxy name
14- 15 I2 --- Type [0/11] Morphological type
17- 23 F7.3 10+9Lsun L[3.6] luminosity of the galaxy in the 3.6um band
25- 29 F5.3 10+9Lsun e_L[3.6] rms uncertainty on L[3.6]
32- 36 F5.2 kpc Reff Effective radius at [3.6] the radius at
which half of the total light of the
galaxy is emitted)
38- 42 F5.2 kpc Rdisc Exponential disc radius
44- 48 F5.2 10+9Msun Mgas Total gaseous mass
50- 53 F4.2 mag B-V ? B-V colour index
55- 59 F5.2 --- M*/L[3.6] Best-fitting stellar mass-to-light ratio
in the 3.6 micron band for discs
61- 64 F4.2 --- E_M*/L[3.6] Error on M*/L[3.6] (upper value)
66- 69 F4.2 --- e_M*/L[3.6] ? Error on M*/L[3.6] (lower value)
71- 84 F14.5 10+10Msun Mvir Virial mass of the halo (best-fitting
parameters for the NFW dark-halo profile)
86- 99 F14.5 10+10Msun e_Mvir Error on Mvir (upper value)
101-114 F14.5 10+10Msun E_Mvir ? Error on Mvir (lower value)
117-122 F6.2 --- c Concentration parameter (best-fitting
parameters for the NFW dark-halo profile)
124-128 F5.2 --- E_c Error on c (upper value)
130-134 F5.2 --- e_c ? Error on c (lower value)
136-140 F5.2 --- chi2 Reduced chi2
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Jun-2021