William Thomas, M. P., 1640–41

Thomas, Rosie

doi:10.1093/nq/s12-viii.164.450g

Cited by 5 publications

(5 citation statements)

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“…However, hydrodynamical simulations that include non-gravitational heating have demonstrated that this leaves only a negligible imprint in the M -T relation: after being preheated, the ICM settles back into hydrostatic equilibrium, with its temperature being determined by the DM-dominated gravitational potential well . Another possible explanation relies on the effect of radiative cooling (e.g., Thomas et al 2001;Voit et al 2002). Although this may appear counterintuitive, radiative cooling may actually increase the ICM temperature, because it eliminates central pressure support, thus causing gas from outer regions to flow in and be heated by adiabatic compression.…”

Section: The Mass-temperature Relationmentioning

confidence: 99%

X-ray properties of galaxy clusters and groups from a cosmological hydrodynamical simulation

Borgani

Murante

Springel

et al. 2004

Monthly Notices of the Royal Astronomical Society

350

512

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We present results on the X-ray properties of clusters and groups of galaxies, extracted from a large cosmological hydrodynamical simulation. We used the TREE+SPH code GADGET to simulate a concordance Λ cold dark matter cosmological model within a box of 192 h-1 Mpc on a side, 4803 dark matter particles and as many gas particles. The simulation includes radiative cooling assuming zero metallicity, star formation and supernova feedback. The very high dynamic range of the simulation allows us to cover a fairly large interval of cluster temperatures. We compute X-ray observables of the intracluster medium (ICM) for simulated groups and clusters and analyse their statistical properties. The simulated mass-temperature relation is consistent with observations once we mimic the procedure for mass estimates applied to real clusters. Also, with the adopted choices of Ωm= 0.3 and σ8= 0.8 for matter density and power spectrum normalization, respectively, the resulting X-ray temperature function agrees with the most recent observational determinations. The luminosity-temperature relation also agrees with observations for clusters with T>~ 2 keV. At the scale of groups, T<~ 1 keV, we find no change of slope in this relation. The entropy in central cluster regions is higher than predicted by gravitational heating alone, the excess being almost the same for clusters and groups. We also find that the simulated clusters appear to have suffered some overcooling. We find f*~= 0.2 for the fraction of baryons in stars within clusters, thus approximately twice as large as the value observed. Interestingly, temperature profiles of simulated clusters are found to increase steadily toward cluster centres. They decrease in the outer regions, much like observational data do at r>~ 0.2rvir, while not showing an isothermal regime followed by a smooth temperature decline in the innermost regions. Our results thus demonstrate the need for yet more efficient sources of energy feedback and/or the need to consider additional physical process which may be able to further suppress the gas density at the scale of poor clusters and groups, and, at the same time, to regulate the cooling of the ICM in central regions

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Section: The Mass-temperature Relationmentioning

confidence: 99%

X-ray properties of galaxy clusters and groups from a cosmological hydrodynamical simulation

Borgani

Murante

Springel

et al. 2004

Monthly Notices of the Royal Astronomical Society

350

512

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“…We were able, also, to make spot observations in five of the other seven War Relocation Authority [the government agency which ran the camps] projects [15].…”

Section: The University Of California Japanese Evacuation and Resettlmentioning

confidence: 99%

The University of California Japanese evacuation and resettlement study: A prolegomenon

Suzuki¹

1986

Dialect Anthropol

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“…As Thomas postulates, there is an implicit Indian internal doctrine that all ethnic disputes must be resolved within the Indian state which is the target of demands by ethnic self-determination movements. 66 Their demands 'generally center on territory, resources, and power'. 61 Jyotirindra Das Gupta, among others, finds that democratic participation in a power-sharing federal arrangement contributes to the successful integration of ethnic communities.…”

Section: /mentioning

confidence: 99%

The Multilateral Implications of Ethno-Nationalist Violence in South Asia

Rubinoff

2000

South Asian Survey

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ETHNIC CONFLICT IS a world-wide phenomena,' as most states contain at least five ethnically disparate groUpS.2 Because nationalism has tended to be legitimised by statehood, the proliferation of new states since the post-war breakup of colonial empires has spawned contending ethnic claims.' Typified by situations like Rwanda, such strife has resulted in the deaths of 20 million people and created an equal number of refugees since the World War IL4 Refugees are often unwelcome and always suspect, as they impose economic costs on their host states, and pose a threat to their political stability and cultural identity. Moreover, providing sanctuary can invite military reprisal.5 Despite this reality, according to Myron Weiner, one in every 130 people on earth has now been forced to take flight-mostly because of ethnic conflict.' As Weiner indicates, South Asia is both a major generator and receiver of refugees.~ 7 at NANYANG TECH UNIV LIBRARY on June 3, 2015

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William Thomas, M. P., 1640–41

Cited by 5 publications

References 0 publications

X-ray properties of galaxy clusters and groups from a cosmological hydrodynamical simulation

X-ray properties of galaxy clusters and groups from a cosmological hydrodynamical simulation

The University of California Japanese evacuation and resettlement study: A prolegomenon

The Multilateral Implications of Ethno-Nationalist Violence in South Asia

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