The Structure and Dynamics of Massive Early-Type Galaxies: On Homology, Isothermality, and Isotropy Inside One Effective Radius

Koopmans, L. V. E.; Bolton, A.; Treu, Tommaso; Czoske, O.; Auger, Matthew W.; Barnabè, Matteo; Vegetti, Simona; Gavazzi, R.; Moustakas, Leonidas A.; Burles, Scott

doi:10.1088/0004-637x/703/1/l51

Cited by 362 publications

(511 citation statements)

References 48 publications

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“…Our cut-off radii agree with the lensing analysis of cluster galaxies by Halkola et al (2007) but not with the results from Xrays and strong-lensing (Humphrey & Buote 2010;Koopmans et al 2009). Larger cut-off radii are compatible with the data if dark matter halos with steeper outer density profiles are considered.…”

Section: Discussion and Summarycontrasting

confidence: 70%

Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619

Saglia

Fabricius

et al. 2010

A&A

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We present high quality long slit spectra along the major and minor axes out to 1.5-2 R e (14-22 kpc) of three bright elliptical galaxies (NGC 1600, NGC 4125, NGC 7619) obtained at the Hobby-Eberly Telescope (HET). We derive stellar kinematic profiles and Lick/IDS indices (Hβ, Mgb, Fe 5015 , Fe 5270 , Fe 5335 , Fe 5406 ). Moreover, for NGC 4125 we derive gas kinematics and emission line strengths. We model the absorption line strengths using Simple Stellar Populations models that take into account the variation of [α/Fe] and derive ages, total metallicity and element abundances. Overall, we find that the three galaxies have old and [α/Fe] overabundant stellar populations with no significant gradients. The metallicity is supersolar at the center with a strong negative radial gradient. For NGC 4125, several pieces of evidence point to a recent dissipational merger event. We calculate the broad band color profiles with the help of SSP models. All of the colors show sharp peaks at the center of the galaxies, mainly caused by the metallicity gradients, and agree well with the measured colors. Using the Schwarzschild's axisymmetric orbit superposition technique, we model the stellar kinematics to constrain the dark halos of the galaxies. We use the tight correlation between the Mgb strength and local escape velocity to set limits on the extent of the halos by testing different halo sizes. Logarithmic halos -cut at 60 kpc -minimize the overall scatter of the Mgb-V esc relation. Larger cutoff radii are found if the dark matter density profile is decreasing more steeply at large radii.

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Section: Discussion and Summarycontrasting

confidence: 70%

Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619

Saglia

Fabricius

et al. 2010

A&A

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“…In these cases, the modeled SIS velocity dispersion (σ mod ) is in good agreement with the central velocity dispersion measured spectroscopically (σ obs )( [46][47][48][49]). The Einstein ring radius is defined as…”

Section: The Samplesupporting

confidence: 73%

Constraints on holographic cosmologies from strong lensing systems

Cárdenas

Bonilla

Motta

et al. 2013

J. Cosmol. Astropart. Phys.

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We use strongly gravitationally lensed (SGL) systems to put additional constraints on a set of holographic dark energy models. Data available in the literature (redshift and velocity dispersion) is used to obtain the Einstein radius and compare it with model predictions. We found that the ΛCDM is the best fit to the data. Although a preliminary statistical analysis seems to indicate that two of the holographic models studied show interesting agreement with observations, a stringent test lead us to the result that neither of the holographic models are competitive with the ΛCDM.These results highlight the importance of Strong Lensing measurements to provide additional observational constraints to alternative cosmological models, which are necessary to shed some light into the dark universe.

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“…Various studies have shown that the power-law profile provides accurate descriptions of lens galaxies (e.g., Gavazzi et al 2007;Humphrey & Buote 2010;Koopmans et al 2009;Auger et al 2010;Barnabè et al 2011). …”

Section: Lens Mass Profilesmentioning

confidence: 99%

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Suyu

Auger

Hilbert

et al. 2013

ApJ

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368

553

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Strong gravitational lenses with measured time delays between the multiple images and models of the lens mass distribution allow a one-step determination of the time-delay distance, and thus a measure of cosmological parameters. We present a blind analysis of the gravitational lens RXJ1131−1231 incorporating (1) the newly measured time delays from COSMOGRAIL, the COSmological MOnitoring of GRAvItational Lenses, (2) archival Hubble Space Telescope imaging of the lens system, (3) a new velocity-dispersion measurement of the lens galaxy of 323 ± 20 km s −1 based on Keck spectroscopy, and (4) a characterization of the line-of-sight structures via observations of the lens' environment and ray tracing through the Millennium Simulation. Our blind analysis is designed to prevent experimenter bias. The joint analysis of the data sets allows a time-delay distance measurement to 6% precision that takes into account all known systematic uncertainties. Time-delay lenses constrain especially tightly the Hubble constant H 0 (5.7% and 4.0% respectively in wCDM and open ΛCDM) and curvature of the universe. The overall information content is similar to that of Baryon Acoustic Oscillation experiments. Thus, they complement well other cosmological probes, and provide an independent check of unknown systematics. Our measurement of the Hubble constant is completely independent of those based on the local distance ladder method, providing an important consistency check of the standard cosmological model and of general relativity.

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The Structure and Dynamics of Massive Early-Type Galaxies: On Homology, Isothermality, and Isotropy Inside One Effective Radius

Cited by 362 publications

References 48 publications

Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619

Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619

Constraints on holographic cosmologies from strong lensing systems

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

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