A conceptual replication of Beesley et al. (2015)

Walker, Adrian R; Luque, David; Pelley, Mike E. Le; Beesley, Tom

doi:10.31234/osf.io/uanmr

Cited by 5 publications

(9 citation statements)

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“…Our findings therefore suggest that the ultra faint dwarfs require core sizes that are much smaller than the dark matter scale radius. 6 It is interesting to note that increasing the mass of the host halo will not ease the difference between the measured densities and those of cored simulated haloes: whereas for cuspy density profiles, those systems with the highest total mass also have the largest densities, this does not hold for cored haloes. For the case of tidally evolved, cored {α, β , γ} = {1, 5, 0} profiles, from equation 13 we find for the central density ρ(0) = ρ s ∝ M tot /a 3 .…”

Section: Confronting Measured Densities and Simulated Haloesmentioning

confidence: 94%

“…Choosing a different mass-size relation for cored haloes at infall will effect the densities of the simulated haloes. 12 Errani et al…”

Section: Confronting Measured Densities and Simulated Haloesmentioning

confidence: 99%

“…Mass estimates from the virial theorem can be obtained also for dSphs consisting of a stellar tracer embedded in a DM halo (see section 2). Such estimates are based entirely on projected and averaged dispersion measurements, though including velocity components tangential to the line of sight is straightforward (see section 6). The method requires however to make assumptions on the DM halo shape and on how deeply the stellar component is embedded within the halo.…”

Section: Introductionmentioning

confidence: 99%

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Systematics in virial mass estimators for pressure-supported systems

Errani

Peñarrubia

Walker

2018

Monthly Notices of the Royal Astronomical Society

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Mass estimators are a key tool to infer the dark matter content in pressure-supported systems like dwarf spheroidal galaxies (dSphs). We construct an estimator for enclosed masses based on the virial theorem which is insensitive to anisotropy in the velocity dispersion and tailored to yield masses with minimum uncertainty introduced by our ignorance on (i) the shape of the inner halo profile, and (ii) how deeply the stellar component is embedded within the halo:where by R h we denote the projected half-light radius and by σ 2 los the luminosity-averaged squared line-of-sight velocity dispersion. Tests against controlled simulations show that this estimator provides unbiased enclosed masses with an accuracy of ∼ 10 per cent. This confirms the robustness of similar previously proposed mass estimators. Application to published kinematic data of Milky Way dSphs reveals a tight correlation between enclosed mass and luminosity. Using N-body models we show that tidal stripping has little effect on this relation. Comparison against cuspy and cored dark matter haloes extracted from controlled re-simulations of the Aquarius A2 merger tree shows that the high mass densities of ultrafaint galaxies are not compatible with large dark matter cores, and that the (total) halo masses of the classical Milky Way dSphs span a remarkably narrow range (8 log 10 (M/M ) 10) at present, showing no clear trend with either galaxy size or luminosity.

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Section: Confronting Measured Densities and Simulated Haloesmentioning

confidence: 94%

“…Choosing a different mass-size relation for cored haloes at infall will effect the densities of the simulated haloes. 12 Errani et al…”

Section: Confronting Measured Densities and Simulated Haloesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Systematics in virial mass estimators for pressure-supported systems

Errani

Peñarrubia

Walker

2018

Monthly Notices of the Royal Astronomical Society

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“…In many parts of Amazonia, ILs remain the most extensive category of protected areas, retaining 25% of all terrestrial carbon stocks of one-half of the world's remaining tropical forests (10). Current plans to integrate indigenous peoples into the national economy will likely pave the way to an irreversible combination of widespread environmental degradation and economic dependence, cultural assimilation, and ethno-biased poverty (11).…”

Section: Brazil's Indigenous Lands Under Threatmentioning

confidence: 99%

Putting invertebrate lactation in context

Benoit

Attardo

2019

Science

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“…Non-adults display lesions more frequently than adults due to a reduced capacity of sustaining higher red blood cell production. 37 The palaeopathological literature has ascribed cribra orbitalia and porotic hyperostosis to iron deficiency anaemia, arising from excessive blood loss, insufficient dietary iron intake, intestinal parasites or diarrhoea. 38 Lesions also stem from vitamin B12/B9 deficiency in megaloblastic anaemias which may co-occur with iron deficiency.…”

Section: Blood-borne Diseasesmentioning

confidence: 99%

Listening to the Kids: The Value of Childhood Palaeopathology for the Study of Rural Roman Britain

Rohnbogner

2017

Britannia

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Childhood palaeopathology remains an underutilised resource in the study of Roman Britain, particularly for exploring the lives of the rural population. Lesions in child skeletons provide unique insights into past lifeways and population health, as adverse environmental conditions translate more readily into the osteological record of these vulnerable members of society. To demonstrate the range of information gleaned from the children, 1,279 non-adults (0-17 years) from 26 first-to fifth-century urban and rural settlements were analysed, comparing morbidity and mortality in the most comprehensive study to date. The distribution of ages-atdeath suggests migration between country and town, the latter presenting a stressful and unsanitary environment. However, as demonstrated by high rates of metabolic disease and infections, life in the countryside was hampered by demanding physical labour and potentially oppressive conditions with restricted access to resources. stress; Roman rural settlement INTRUCTION: ROMANO-BRITISH CHILDHOODHuman skeletal remains present the most direct form of evidence for studying past populations. Numerous palaeopathological studies of Romano-British adults have provided insight into population health, diet and lifeways, albeit with a bias towards urban cemeteries. 1 More recently, several studies have reported on health in both urban and rural contexts, yet the children did not receive emphasis. 2 Roman archaeology is no different from other branches of the discipline in its research concerns, therefore the childhood experience has not yet fully evolved as a dedicated subject in Roman scholarship. While stable isotope analysis of Romano-British children has received considerable attention, 3 the actual health status of children remains relatively unexplored and a comprehensive picture of growing up in Roman Britain is still lacking. As children are growing, they reflect adverse environmental conditions more readily than their parents. 4 Child health is therefore a very powerful indicator of overall population health and dynamics, making non-adult (0-17 years) palaeopathology a primary source of evidence for past lifestyles and living environments.The osteological term 'non-adult' is not without problems but allows us to label, observe and discuss immature individuals in the past without involuntarily attaching social age norms. 5The cut-off age of 17 years is a product of the most accurate osteological ageing methods used and allows comparison between bioarchaeological datasets. Alongside age-at-death, a range of acquired conditions of ill-health can be observed in non-adult skeletons, which can provide information regarding cultural change, environmental pressures and life histories. The classical literature on Romano-British children is limited and, as so often in the study of Romano-British lifeways, we are forced to look to Rome for analogies and guidance. The classical literature, epigraphic and iconographic references provide a wealth of information on the Roman childhood experience...

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A conceptual replication of Beesley et al. (2015)

Abstract: This is a conceptual replication of Stage 1 training of Experiment 2 of Beesley et al. (2015), and a companion report to Walker et al. (Submitted).

Cited by 5 publications

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Systematics in virial mass estimators for pressure-supported systems

Systematics in virial mass estimators for pressure-supported systems

Putting invertebrate lactation in context

Listening to the Kids: The Value of Childhood Palaeopathology for the Study of Rural Roman Britain

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