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

Ferreras, Ignacio; Saha, Prasenjit; Williams, Liliya L. R.; Burles, Scott

doi:10.1017/s1743921307014007

Cited by 5 publications

(6 citation statements)

References 40 publications

(49 reference statements)

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“…(e.g., Roberts 1969;Faber & Gallagher 1979). However, the inferred dark-matter content of cores of galaxies, in many cases, seems to fall well short of the standard model predictions (e.g., Gentile et al 2004;Ferreras et al 2007). In the same spirit, intriguing studies of dark haloes of early-type galaxies, using planetary nebulae as tracers of the distribution of matter, seem to indicate the under-abundance of dark matter (e.g., Romanowsky et al 2003).…”

Section: Introductionmentioning

confidence: 86%

The Distribution of Dark Matter in the Halo of the Early-Type Galaxy NGC 4636

Chakrabarty

Raychaudhury

2008

The Astronomical Journal

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We present the density structure of dark matter in the outer parts (to about seven effective radii) of the elliptical galaxy NGC 4636, from the radial velocities of 174 globular clusters (GCs), using the non-parametric, inverse algorithm CHASSIS. We find the galaxy to be rich in dark matter, with R-band mass-to-light ratios (M/L) rising to about 30, at nearly 4R e ; the K-band M/L at about 3R e is found to be nearly 10. The result does not depend on applying the method to the red and blue GCs separately. This estimate of M/L is higher than the previous analysis from the same kinematic data. We also find that the dark-matter distribution is highly concentrated toward the inner halo.

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Section: Introductionmentioning

confidence: 86%

The Distribution of Dark Matter in the Halo of the Early-Type Galaxy NGC 4636

Chakrabarty

Raychaudhury

2008

The Astronomical Journal

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“…Our 1-D estimates are compared with more detailed non-parametric models from Refs. [11] and [17]. A typical error bar from these estimates is also shown.…”

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confidence: 98%

“…We also include more detailed non-parametric conventional mass estimates of strong lenses from Refs. [11] and [17].…”

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confidence: 99%

Necessity of Dark Matter in Modified Newtonian Dynamics within Galactic Scales

2008

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To test modified Newtonian dynamics (MOND) on galactic scales, we study six strong gravitational lensing early-type galaxies from the CASTLES sample. Comparing the total mass (from lensing) with the stellar mass content (from a comparison of photometry and stellar population synthesis), we conclude that strong gravitational lensing on galactic scales requires a significant amount of dark matter, even within MOND. On such scales a 2 eV neutrino cannot explain the excess of matter in contrast with recent claims to explain the lensing data of the bullet cluster. The presence of dark matter is detected in regions with a higher acceleration than the characteristic MOND scale of approximately 10(-10) m/s(2). This is a serious challenge to MOND unless lensing is qualitatively different [possibly to be developed within a covariant, such as Tensor-Vector-Scalar (TeVeS), theory].

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“…Ferreras et al (2008) suggest a large scatter in the outer slope of the dark matter distributions that they recover for their targeted galaxies. Gavazzi et al (2007) corroborate an NFW modelling of the dark haloes of their sample galaxies, suggesting that the total matter density tends to an overall isothermal form.…”

Section: Why Choose Nfw?mentioning

confidence: 94%

Total mass distributions of Sersic galaxies from photometry and central velocity dispersion

Chakrabarty

Jackson²

2009

A&A

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Aims. We develop a novel way of finding total mass density profiles in Sersic ellipticals, to about 3 times the major axis effective radius, using no other information other than what is typically available for distant galaxies, namely the observed surface brightness distribution and the central velocity dispersion σ 0 . Methods. The luminosity density profile of the observed galaxy is extracted by deprojecting the measured brightness distribution and scaling it by a fiduciary, step-function shaped, raw mass-to-light ratio profile (M/L). The resulting raw, discontinuous, total, 3-D mass density profile is then smoothed according to a proposed smoothing prescription. The parameters of this raw M/L are characterised by implementing the observables in a model-based study. Results. The complete characterisation of the formalism is provided as a function of the measurements of the brightness distribution and σ 0 . The formalism, thus specified, is demonstrated to yield the mass density profiles of a suite of test galaxies and is successfully applied to extract the gravitational mass distribution in NGC 3379 and NGC 4499, out to about 3 effective radii.

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

Cited by 5 publications

References 40 publications

The Distribution of Dark Matter in the Halo of the Early-Type Galaxy NGC 4636

The Distribution of Dark Matter in the Halo of the Early-Type Galaxy NGC 4636

Necessity of Dark Matter in Modified Newtonian Dynamics within Galactic Scales

Total mass distributions of Sersic galaxies from photometry and central velocity dispersion

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