Modified gravity and large scale flows, a review

Mould, Jeremy

doi:10.1007/s10509-017-3005-3

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…It has long been understood that the virial theorem 1 will place quiescent galaxies with a well-defined mass to light ratio in a plane in this space. The observed tilt of the plane differs from the expectation, however, and the deviation can be patched using the halo occupation distribution formalism (e.g., Moster et al, 2010;Mould, 2014Mould, , 2017. But that formalism is not physics: it is a mapping between the dark matter universe and the observed one.…”

Section: Introductionmentioning

confidence: 97%

Understanding the Fundamental Plane and the Tully Fisher Relation

Mould¹

2020

Front. Astron. Space Sci.

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The relation between early type galaxy size, surface brightness and velocity dispersion, "the fundamental plane," has long been understood as resulting from equilibrium in their largely pressure supported stellar dynamics. The dissipation and feedback involved in reaching such an equilibrium through merger formation of these galaxies over cosmic time can be responsible for the orientation of the plane. We see a correlation between surface brightness enhancement and youth in the 6dF Galaxy Survey. Correlations of this "tilt" with stellar mass, age, concentration, shape, and metallicity now point the direction for further work on the resolved kinematics and structure of these nearby galaxies and on their initial mass function and dark matter component. On the face of it, the Tully Fisher relation is a simpler one dimensional scaling relation. However, as late type galaxies have bulges as well as disks, and, as the surface density of disks is only standard for the more massive galaxies, additional parameters are involved.

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Section: Introductionmentioning

confidence: 97%

Understanding the Fundamental Plane and the Tully Fisher Relation

Mould¹

2020

Front. Astron. Space Sci.

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“…the newly discovered Vela supercluster; Kraan-Korteweg et al 2017), or to unexpected deviations from standard ΛCDM cosmology (e.g. Mould 2017).…”

Section: Scientific Goalsmentioning

confidence: 99%

The Taipan Galaxy Survey: Scientific Goals and Observing Strategy

Cunha

Hopkins

Colless

et al. 2017

Publ. Astron. Soc. Aust.

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The Taipan galaxy survey (hereafter simply 'Taipan') is a multi-object spectroscopic survey starting in 2017 that will cover 2π steradians over the southern sky (δ ࣠ 10°, |b| ࣡ 10°), and obtain optical spectra for about two million galaxies out to z < 0.4. Taipan will use the newly refurbished 1.2-m UK Schmidt Telescope at Siding Spring Observatory with the new TAIPAN instrument, which includes an innovative 'Starbugs' positioning system capable of rapidly and simultaneously deploying up to 150 spectroscopic fibres (and up to 300 with a proposed upgrade) over the 6°diameter focal plane, and a purpose-built spectrograph operating in the range from 370 to 870 nm with resolving power R ࣡ 2 000. The main scientific goals of Taipan are (i) to measure the distance scale of the Universe (primarily governed by the local expansion rate, H 0 ) to 1% precision, and the growth rate of structure to 5%; (ii) to make the most extensive map yet constructed of the total mass distribution and motions in the local Universe, using peculiar velocities based on improved Fundamental Plane distances, which will enable sensitive tests of gravitational physics; and (iii) to deliver a legacy sample of low-redshift galaxies as a unique laboratory for studying galaxy evolution as a function of dark matter halo and stellar mass and environment. The final survey, which will be completed within 5 yrs, will consist of a complete magnitude-limited sample (i 17) of about 1.2 × 10 6 galaxies supplemented by an extension to higher redshifts and fainter magnitudes (i 18.1) of a luminous red galaxy sample of about 0.8 × 10 6 galaxies. Observations and data processing will be carried out remotely and in a fully automated way, using a purpose-built automated 'virtual observer' software and an automated data reduction pipeline. The Taipan survey is deliberately designed to maximise its legacy value by complementing and enhancing current and planned surveys of the southern sky at wavelengths from the optical to the radio; it will become the primary redshift and optical spectroscopic reference catalogue for the local extragalactic Universe in the southern sky for the coming decade.

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Modified gravity and large scale flows, a review

Abstract: Large scale flows have been a challenging feature of cosmography ever since galaxy scaling relations came on the scene 40 years ago. The next generation of surveys will offer a serious test of the standard cosmology.

Cited by 2 publications

References 22 publications

Understanding the Fundamental Plane and the Tully Fisher Relation

Understanding the Fundamental Plane and the Tully Fisher Relation

The Taipan Galaxy Survey: Scientific Goals and Observing Strategy

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