Publication

The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004

Treu, T. & Koopmans, L. V. E., 1-Aug-2002, In : The Astrophysical Journal. 575, 1, p. 87-94

Research output: Contribution to journalArticleAcademicpeer-review

APA

Treu, T., & Koopmans, L. V. E. (2002). The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004. The Astrophysical Journal, 575(1), 87-94. https://doi.org/10.1086/341216

Author

Treu, Tommaso ; Koopmans, Léon V. E. / The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004. In: The Astrophysical Journal. 2002 ; Vol. 575, No. 1. pp. 87-94.

Harvard

Treu, T & Koopmans, LVE 2002, 'The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004', The Astrophysical Journal, vol. 575, no. 1, pp. 87-94. https://doi.org/10.1086/341216

Standard

The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004. / Treu, Tommaso; Koopmans, Léon V. E.

In: The Astrophysical Journal, Vol. 575, No. 1, 01.08.2002, p. 87-94.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Treu T, Koopmans LVE. The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004. The Astrophysical Journal. 2002 Aug 1;575(1):87-94. https://doi.org/10.1086/341216


BibTeX

@article{0a055254f8f0473bbbbe77c85d609ff3,
title = "The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004",
abstract = "We combine our recent measurements of the velocity dispersion and the surface brightness profile of the lens galaxy D in the system MG 2016+112 (z=1.004) with constraints from gravitational lensing to study its internal mass distribution. We find the following: (1) dark matter accounts for more than 50% of the total mass within the Einstein radius (99% confidence limit [CL]), whereas ~75% is the more likely contribution. In particular, we can exclude at the 8 σ level that mass follows light inside the Einstein radius with a constant mass-to-light ratio (M/L). (2) The total mass distribution inside the Einstein radius is well described by a density profile ~r-γ', with an effective slope γ'=2.0+/-0.1+/-0.1, including random and systematic uncertainties. (3) The offset of galaxy D from the local fundamental plane independently constrains the stellar M/L and matches the range derived from our models, leading to a more stringent lower limit of more than 60% on the fraction of dark matter within the Einstein radius (99% CL). Under the assumption of adiabatic contraction, we show that the inner slope of the dark matter halo before the baryons collapsed to form the lens galaxy is γi",
keywords = "Cosmology: Dark Matter, Galaxies: Elliptical and Lenticular, cD, Galaxies: Formation, Galaxies: Kinematics and Dynamics, Galaxies: Structure, Cosmology: Gravitational Lensing",
author = "Tommaso Treu and Koopmans, {L{\'e}on V. E.}",
year = "2002",
month = aug,
day = "1",
doi = "10.1086/341216",
language = "English",
volume = "575",
pages = "87--94",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP PUBLISHING LTD",
number = "1",

}

RIS

TY - JOUR

T1 - The Internal Structure and Formation of Early-Type Galaxies: The Gravitational Lens System MG 2016+112 at z = 1.004

AU - Treu, Tommaso

AU - Koopmans, Léon V. E.

PY - 2002/8/1

Y1 - 2002/8/1

N2 - We combine our recent measurements of the velocity dispersion and the surface brightness profile of the lens galaxy D in the system MG 2016+112 (z=1.004) with constraints from gravitational lensing to study its internal mass distribution. We find the following: (1) dark matter accounts for more than 50% of the total mass within the Einstein radius (99% confidence limit [CL]), whereas ~75% is the more likely contribution. In particular, we can exclude at the 8 σ level that mass follows light inside the Einstein radius with a constant mass-to-light ratio (M/L). (2) The total mass distribution inside the Einstein radius is well described by a density profile ~r-γ', with an effective slope γ'=2.0+/-0.1+/-0.1, including random and systematic uncertainties. (3) The offset of galaxy D from the local fundamental plane independently constrains the stellar M/L and matches the range derived from our models, leading to a more stringent lower limit of more than 60% on the fraction of dark matter within the Einstein radius (99% CL). Under the assumption of adiabatic contraction, we show that the inner slope of the dark matter halo before the baryons collapsed to form the lens galaxy is γi

AB - We combine our recent measurements of the velocity dispersion and the surface brightness profile of the lens galaxy D in the system MG 2016+112 (z=1.004) with constraints from gravitational lensing to study its internal mass distribution. We find the following: (1) dark matter accounts for more than 50% of the total mass within the Einstein radius (99% confidence limit [CL]), whereas ~75% is the more likely contribution. In particular, we can exclude at the 8 σ level that mass follows light inside the Einstein radius with a constant mass-to-light ratio (M/L). (2) The total mass distribution inside the Einstein radius is well described by a density profile ~r-γ', with an effective slope γ'=2.0+/-0.1+/-0.1, including random and systematic uncertainties. (3) The offset of galaxy D from the local fundamental plane independently constrains the stellar M/L and matches the range derived from our models, leading to a more stringent lower limit of more than 60% on the fraction of dark matter within the Einstein radius (99% CL). Under the assumption of adiabatic contraction, we show that the inner slope of the dark matter halo before the baryons collapsed to form the lens galaxy is γi

KW - Cosmology: Dark Matter

KW - Galaxies: Elliptical and Lenticular

KW - cD

KW - Galaxies: Formation

KW - Galaxies: Kinematics and Dynamics

KW - Galaxies: Structure

KW - Cosmology: Gravitational Lensing

U2 - 10.1086/341216

DO - 10.1086/341216

M3 - Article

VL - 575

SP - 87

EP - 94

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

ER -

ID: 25111303