Baryonic Properties of the Darkest Galaxies

Grebel, Eva K.

doi:10.1017/s1743921307014135

Cited by 3 publications

(1 citation statement)

References 127 publications

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“…It is known that the satellite galaxies all have ancient populations of an indistinguishable age (Grebel 2008), perhaps being created when the TDGs were born. Or, the ancient population comes from the precursor host galaxy.…”

Section: The Evolution Of Tdgsmentioning

confidence: 99%

Local-Group tests of dark-matter concordance cosmology

Kroupa

Famaey

Boer

et al. 2010

A&A

225

310

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Predictions of the concordance cosmological model (CCM) of the structures in the environment of large spiral galaxies are compared with observed properties of Local Group galaxies. Five new, most probably irreconcilable problems are uncovered: 1) A wide variety of published CCM models consistently predict some form of relation between dark-matter-mass and luminosity for the Milky Way (MW) satellite galaxies, but none is observed.2) The mass function of luminous sub-haloes predicted by the CCM contains too few satellites with dark matter (DM) mass ≈10 7 M within their innermost 300 pc than in the case of the MW satellites.3) The Local Group galaxies and data from extragalactic surveys indicate there is a correlation between bulge-mass and the number of luminous satellites that is not predicted by the CCM. 4) The 13 new ultra-faint MW satellites define a disc-of-satellites (DoS) that is virtually identical to the DoS previously found for the 11 classical MW satellites, implying that most of the 24 MW satellites are correlated in phase-space. 5) The occurrence of two MW-type DM halo masses hosting MW-like galaxies is unlikely in the CCM. However, the properties of the Local Group galaxies provide information leading to a solution of the above problems. The DoS and bulge-satellite correlation suggest that dissipational events forming bulges are related to the processes forming phase-space correlated satellite populations. These events are well known to occur since in galaxy encounters energy and angular momentum are expelled in the form of tidal tails, which can fragment to form populations of tidal-dwarf galaxies (TDGs) and associated star clusters. If Local Group satellite galaxies are to be interpreted as TDGs then the substructure predictions of the CCM are internally in conflict. All findings thus suggest that the CCM does not account for the Local Group observations and that therefore existing as well as new viable alternatives have to be further explored. These are discussed and natural solutions for the above problems emerge.

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Section: The Evolution Of Tdgsmentioning

confidence: 99%

Local-Group tests of dark-matter concordance cosmology

Kroupa

Famaey

Boer

et al. 2010

A&A

225

310

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The Milky Way satellite galaxies as critical tests of contemporary cosmological theory

Kroupa¹,

Martínez–Delgado²,

Mediavilla³

2013

Local Group Cosmology

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CO and H I observations of an enigmatic interstellar cloud

Libert¹,

Gérard

Bertre³

et al. 2009

A&A

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Context. An isolated H i cloud with peculiar properties has recently been discovered by Dedes et al. (2008, A&A, 491, L45) with the 300-m Arecibo telescope, and subsequently imaged with the VLA. It has an angular size of ∼6 , and the H i emission has a narrow line profile of width ∼3 km s −1 . Aims. We explore the possibility that this cloud could be associated with a circumstellar envelope ejected by an evolved star. Methods. Observations were made in the rotational lines of CO with the IRAM-30m telescope, on three positions in the cloud, and a total-power mapping in the H i line was obtained with the Nançay Radio Telescope.Results. CO was not detected and seems too underabundant in this cloud to be a classical late-type star circumstellar envelope. On the other hand, the H i emission is compatible with the detached-shell model that we developed for representing the external environments of AGB stars. Conclusions. We propose that this cloud could be a fossil circumstellar shell left over from a system that is now in a post-planetarynebula phase. Nevertheless, we cannot rule out that it is a Galactic cloud or a member of the Local Group, although the narrow line profile would be atypical in both cases.

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Baryonic Properties of the Darkest Galaxies

Cited by 3 publications

References 127 publications

Local-Group tests of dark-matter concordance cosmology

Local-Group tests of dark-matter concordance cosmology

The Milky Way satellite galaxies as critical tests of contemporary cosmological theory

CO and H I observations of an enigmatic interstellar cloud

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