“Viajeras razones.” Metafísica y fantasía, o el extraño caso de Macedonio y Borges

Prieto, Julio

doi:10.4000/lirico.805

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…This method is complementary to the PNe studies but one must consider whether globular clusters are indeed unbiased tracers of the gravitational potential (cf. Prieto & Gnedin 2006).…”

Section: Globular Clustersmentioning

confidence: 99%

Mapping the Distribution of Luminous and Dark Matter in Strong Lensing Galaxies

et al. 2007

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Abstract. We present the distribution of luminous and dark matter in a set of strong lensing (early-type) galaxies. By combining two independent techniques -stellar population synthesis and gravitational lensing -we can compare the baryonic and dark matter content in these galaxies within the regions that can be probed using the images of the lensed background source. Two samples were studied, extracted from the CASTLES and SLACS surveys. The former probes a wider range of redshifts and allows us to explore the mass distribution out to ∼ 5R e . The high resolution optical images of the latter (using HST/ACS) are used to show a pixellated map of the ratio between total and baryonic matter. We find dark matter to be absent in the cores of these galaxies, with an increasing contribution at projected radii R > ∼ Re . The slopes are roughly compatible with an isothermal slope (better interpreted as an adiabatically contracted NFW profile), but a large scatter in the slope exists among galaxies. There is a trend suggesting most massive galaxies have a higher content of dark matter in the regions probed by this analysis.

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“…This method is complementary to the PNe studies but one must consider whether globular clusters are indeed unbiased tracers of the gravitational potential (cf. Prieto & Gnedin 2006).…”

Section: Globular Clustersmentioning

confidence: 99%

Mapping the Distribution of Luminous and Dark Matter in Strong Lensing Galaxies

et al. 2007

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“…However, the orbit of Pal 4 is actually unknown. From observations (Dinescu et al 1999) and cosmological simulations (Prieto & Gnedin 2006), we would expect that most of the Galactic GCs are on eccentric orbits. The mean orbital eccentricity of Galactic GCs with known orbits are around e ≈ 0.5 (Casetti- Dinescu et al 2007Dinescu et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

Direct N-body simulations of globular clusters – III. Palomar 4 on an eccentric orbit

Zonoozi

Haghi

Kroupa

et al. 2017

Mon. Not. R. Astron. Soc.

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Palomar 4 is a low-density globular cluster with a current mass ≈ 30000 M ⊙ in the outer halo of the Milky Way with a two-body relaxation time of the order of a Hubble time. Yet, it is strongly mass segregated and contains a stellar mass function depleted of low-mass stars. Pal 4 was either born this way or it is a result of extraordinary dynamical evolution. Since two-body relaxation cannot explain these signatures alone, enhanced mass loss through tidal shocking may have had a strong influence on Pal 4. Here, we compute a grid of direct N-body simulations to model Pal 4 on various eccentric orbits within the Milky Way potential to find likely initial conditions that reproduce its observed mass, half-light radius, stellar MF-slope and line-of-sight velocity dispersion. We find that Pal 4 is most likely orbiting on an eccentric orbit with an eccentricity of e ≈ 0.9 and pericentric distance of R p ≈ 5 kpc. In this scenario, the required 3D half-mass radius at birth is similar to the average sizes of typical GCs (R h ≈ 4−5 pc), while its birth mass is about M 0 ≈ 10 5 M ⊙ . We also find a high degree of primordial mass segregation among the cluster stars, which seems to be necessary in every scenario we considered. Thus, using the tidal effect to constrain the perigalactic distance of the orbit of Pal 4, we predict that the proper motion of Pal 4 should be in the range −0.52 µ δ −0.38 mas yr −1 and −0.30 µ α cos δ −0.15 mas yr −1 .

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“Viajeras razones.” Metafísica y fantasía, o el extraño caso de Macedonio y Borges

Cited by 2 publications

References 1 publication

Mapping the Distribution of Luminous and Dark Matter in Strong Lensing Galaxies

Mapping the Distribution of Luminous and Dark Matter in Strong Lensing Galaxies

Direct N-body simulations of globular clusters – III. Palomar 4 on an eccentric orbit

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