MOND and the dark baryons

Tiret, O.; Combes, F.

doi:10.1051/0004-6361/200811085

Cited by 21 publications

(35 citation statements)

References 46 publications

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“…This Figure shows that about half of galaxies in the sample (72 out of 153 galaxies or 47%) could contain some dark baryons because the c-values for these galaxies is in the range of 1 < c < 10, and (53%) of galaxies have a scale factor of 1, equivalent to a model without dark baryons. The mean values of the scale-factor are < c >= 2.1 ± 1.7 and 2.7 ± 1.7 for Models A.2 and A.3, respectively, in agreement with the previous works such as Tiret & Combes (2009).…”

Section: Standard Interpolating Functionsupporting

confidence: 91%

“…On the other hand, the empirically strong correlation between the baryonic, Newtonian acceleration and the dynamical acceleration V 2 (R)/R at the same position (RAR), is one of the major predictions of modified Newtonian dynamics (MOND) (Milgrom 1983a(Milgrom , 2016bCombes & Tiret 2010). Indeed the presence of dark molecular gas increases the baryonic mass and hence reduces the critical acceleration of MOND, the result that was later confirmed by Tiret & Combes (2009) who found that the observed rotational velocities of a sample of 43 spiral galaxies can be explained in the framework of MOND with a lower value of a 0 1 and the best-fitting c-value of 3.…”

Section: Some Cosmological Evidences Such As Cosmic Microwavementioning

confidence: 91%

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The radial acceleration relation and dark baryons in MOND

Ghari

Haghi

Zonoozi

2019

Monthly Notices of the Royal Astronomical Society

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Recent observations of rotationally supported galaxies show a tight correlation between the observed radial acceleration at every radius and the Newtonian acceleration generated by the baryonic mass distribution, the so-called radial acceleration relation (RAR). The rotation curves (RCs) of the SPARC sample of disk galaxies with different morphologies, masses, sizes and gas fractions are investigated in the context of modified Newtonian dynamics (MOND). We include the effect of cold dark baryons by scaling the measured mass in the atomic form by a factor of c in the mass budget of galaxies. In addition to the standard interpolating function, we also fit the RCs and the RAR with the empirical RAR-inspired interpolating function. Slightly better fits for about 47% of galaxies in our sample are achieved in the presence of dark baryons (c > 1) with the mean value of c = 2.4 ± 1.3. Although the MOND fits are not significantly improved by including dark baryons, it results in a decrease in the characteristic acceleration g † by 40%. We find no correlation between the MOND critical acceleration a 0 and the central surface brightness of the stellar disk, µ 3.6 . This supports a 0 being a universal constant for all galaxies.

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Section: Standard Interpolating Functionsupporting

confidence: 91%

Section: Some Cosmological Evidences Such As Cosmic Microwavementioning

confidence: 91%

The radial acceleration relation and dark baryons in MOND

Ghari

Haghi

Zonoozi

2019

Monthly Notices of the Royal Astronomical Society

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“…Legend as in Fig. 1. assumption of cold unobservable molecular gas in the galactic disk (Tiret & Combes 2009) leads to better fits with lower χ 2 .…”

Section: Numerical Resultsmentioning

confidence: 99%

The distinguishing factor for gravity models: stellar population synthesis

Zonoozi

Haghi

2010

A&A

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Alternative gravitations of Milgrom (MOND), Moffat (MOG), and CDM scenarios all simulate rotation curves of spirals with reasonable details. They display significant disparities however in predicting the stellar mass-to-light (M * /L) ratios of the galaxies. We maintain this feature could serve as a distinguishing factor between different alternative theories. We analyze the rotation curves of 46 low-and high-surface brightness galaxies and compare the resulting M * /Ls with the predictions of the Stellar Population Synthesis (SPS) scheme. The color-M * /L correlation obtained for MOND is consistent with predictions of SPS models. MOG does not show this consistency, and the M * /Ls of CDM model shows large dispersions. Furthermore, M * /L ratios of MOND with Bekenstein interpolating function favor Kroupa's initial mass function (IMF) of the SPS scheme, while those of MOND with standard and simple interpolating functions are consistent with Salpeter's IMF. Here is another indication to differentiate between different IMFs that are used in SPS context.

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“…Interpretation of the BTF relation in the context of MOND leads to the estimate a0 = cm/s 2 [10]. The transition between these limiting cases can be described by a simple expression [30]:…”

Section: Rotation Curve Plotting In the Mond Modelmentioning

confidence: 99%

Galaxies with Declining Rotation Curves

Zobnina

Засов

2020

Astron. Rep.

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A sample of 22 spiral galaxies compiled from published data is studied. The galaxy rotation curves pass through a maximum distance of more than ~1 kpc from the center with a subsequent decrease in the rotation velocity. The galaxy position in the Tully-Fisher (TF) and baryonic Tully-Fisher (BTF) diagrams show that the values of maximum rotation velocities are located on the same sequence with other galaxies, while the velocities at the disk periphery for some galaxies are significantly lower than the expected values for a given mass or luminosity. Thus, the decrease in the rotation curve can be associated with a reduced contribution of the dark halo to the rotation velocity. For seven galaxies with the longest rotation curves, the disk mass was estimated to be with the dark halo (Newtonian model) and without the halo (modified Newtonian dynamics (MOND) model). In four of the galaxies, the MOND model encounters difficulties in interpreting the rotation curve: in order to be consistent with the observations, the MOND parameter should differ significantly from the expected value cm/s2, while the disk mass exceeds the value based on IR photometry and maximum disk model. The conflict with MOND is the most significant for NGC 157.

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MOND and the dark baryons

Cited by 21 publications

References 46 publications

The radial acceleration relation and dark baryons in MOND

The radial acceleration relation and dark baryons in MOND

The distinguishing factor for gravity models: stellar population synthesis

Galaxies with Declining Rotation Curves

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