Publication

The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001

Dutton, A. A., Brewer, B. J., Marshall, P. J., Auger, M. W., Treu, T., Koo, D. C., Bolton, A. S., Holden, B. P. & Koopmans, L. V. E., Nov-2011, In : Monthly Notices of the Royal Astronomical Society. 417, 3, p. 1621-1642 22 p.

Research output: Contribution to journalArticleAcademicpeer-review

APA

Dutton, A. A., Brewer, B. J., Marshall, P. J., Auger, M. W., Treu, T., Koo, D. C., Bolton, A. S., Holden, B. P., & Koopmans, L. V. E. (2011). The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001. Monthly Notices of the Royal Astronomical Society, 417(3), 1621-1642. https://doi.org/10.1111/j.1365-2966.2011.18706.x

Author

Dutton, Aaron A. ; Brewer, Brendon J. ; Marshall, Philip J. ; Auger, Matthew W. ; Treu, Tommaso ; Koo, David C. ; Bolton, Adam S. ; Holden, Bradford P. ; Koopmans, Leon V. E. / The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001. In: Monthly Notices of the Royal Astronomical Society. 2011 ; Vol. 417, No. 3. pp. 1621-1642.

Harvard

Dutton, AA, Brewer, BJ, Marshall, PJ, Auger, MW, Treu, T, Koo, DC, Bolton, AS, Holden, BP & Koopmans, LVE 2011, 'The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001', Monthly Notices of the Royal Astronomical Society, vol. 417, no. 3, pp. 1621-1642. https://doi.org/10.1111/j.1365-2966.2011.18706.x

Standard

The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001. / Dutton, Aaron A.; Brewer, Brendon J.; Marshall, Philip J.; Auger, Matthew W.; Treu, Tommaso; Koo, David C.; Bolton, Adam S.; Holden, Bradford P.; Koopmans, Leon V. E.

In: Monthly Notices of the Royal Astronomical Society, Vol. 417, No. 3, 11.2011, p. 1621-1642.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Dutton AA, Brewer BJ, Marshall PJ, Auger MW, Treu T, Koo DC et al. The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001. Monthly Notices of the Royal Astronomical Society. 2011 Nov;417(3):1621-1642. https://doi.org/10.1111/j.1365-2966.2011.18706.x


BibTeX

@article{2fdd7eddeaae43159bd9b1b652c1f5a0,
title = "The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001",
abstract = "The degeneracy among the disc, bulge and halo contributions to galaxy rotation curves prevents an understanding of the distribution of baryons and dark matter in disc galaxies. In an attempt to break this degeneracy, we present an analysis of the strong gravitational lens SDSS J2141-0001, discovered as part of the Sloan Lens ACS survey. The lens galaxy is a high-inclination, disc-dominated system. We present new Hubble Space Telescope multicolour imaging, gas and stellar kinematics data derived from long-slit spectroscopy and K-band laser guide star adaptive optics imaging, both from the Keck telescopes. We model the galaxy as a sum of concentric axisymmetric bulge, disc and halo components and infer the contribution of each component, using information from gravitational lensing and gas kinematics. This analysis yields a best-fitting total (disc plus bulge) stellar mass of log10(M*/M⊙) = 10.99+0.11- 0.25. The photometric data combined with stellar population synthesis models yield log10(M*/M⊙) = 10.97 ± 0.07 and 11.21 ± 0.07 for the Chabrier and Salpeter initial mass functions (IMFs), respectively. Assuming no cold gas, a Salpeter IMF is marginally disfavoured, with a Bayes factor of 2.7. Accounting for the expected gas fraction of ≃ 20 per cent reduces the lensing plus kinematics stellar mass by 0.10 ± 0.05 dex, resulting in a Bayes factor of 11.9 in favour of a Chabrier IMF. The dark matter halo is roughly spherical, with minor to major axis ratio q3, h= 0.91+0.15- 0.13. The dark matter halo has a maximum circular velocity of Vmax= 276+17- 18 km s-1, and a central density parameter of log10ΔV/2= 5.9+0.9- 0.5. This is higher than predicted for uncontracted dark matter haloes in Λ cold dark matter cosmologies, log10ΔV/2= 5.2, suggesting that either the halo has contracted in response to galaxy formation, or that the halo has a higher than average concentration. Larger samples of spiral galaxy strong gravitational lenses are needed in order to distinguish between these two possibilities. At 2.2 disc scalelengths the dark matter fraction is fDM= 0.55+0.20- 0.15, suggesting that SDSS J2141-0001 is submaximal. Based in part on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. These observations are associated with programmes 10587 and 11978.",
keywords = "gravitational lensing: strong, galaxies: fundamental parameters, galaxies: haloes, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure, DARK-MATTER HALOES, SURFACE BRIGHTNESS GALAXIES, RESOLUTION ROTATION CURVES, INITIAL MASS FUNCTION, DIGITAL SKY SURVEY, UNIVERSAL DENSITY PROFILE, TULLY-FISHER RELATION, TO-LIGHT RATIOS, ACS SURVEY, IRREGULAR GALAXIES",
author = "Dutton, {Aaron A.} and Brewer, {Brendon J.} and Marshall, {Philip J.} and Auger, {Matthew W.} and Tommaso Treu and Koo, {David C.} and Bolton, {Adam S.} and Holden, {Bradford P.} and Koopmans, {Leon V. E.}",
year = "2011",
month = nov,
doi = "10.1111/j.1365-2966.2011.18706.x",
language = "English",
volume = "417",
pages = "1621--1642",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

RIS

TY - JOUR

T1 - The SWELLS survey - II. Breaking the disc-halo degeneracy in the spiral galaxy gravitational lens SDSS J2141-0001

AU - Dutton, Aaron A.

AU - Brewer, Brendon J.

AU - Marshall, Philip J.

AU - Auger, Matthew W.

AU - Treu, Tommaso

AU - Koo, David C.

AU - Bolton, Adam S.

AU - Holden, Bradford P.

AU - Koopmans, Leon V. E.

PY - 2011/11

Y1 - 2011/11

N2 - The degeneracy among the disc, bulge and halo contributions to galaxy rotation curves prevents an understanding of the distribution of baryons and dark matter in disc galaxies. In an attempt to break this degeneracy, we present an analysis of the strong gravitational lens SDSS J2141-0001, discovered as part of the Sloan Lens ACS survey. The lens galaxy is a high-inclination, disc-dominated system. We present new Hubble Space Telescope multicolour imaging, gas and stellar kinematics data derived from long-slit spectroscopy and K-band laser guide star adaptive optics imaging, both from the Keck telescopes. We model the galaxy as a sum of concentric axisymmetric bulge, disc and halo components and infer the contribution of each component, using information from gravitational lensing and gas kinematics. This analysis yields a best-fitting total (disc plus bulge) stellar mass of log10(M*/M⊙) = 10.99+0.11- 0.25. The photometric data combined with stellar population synthesis models yield log10(M*/M⊙) = 10.97 ± 0.07 and 11.21 ± 0.07 for the Chabrier and Salpeter initial mass functions (IMFs), respectively. Assuming no cold gas, a Salpeter IMF is marginally disfavoured, with a Bayes factor of 2.7. Accounting for the expected gas fraction of ≃ 20 per cent reduces the lensing plus kinematics stellar mass by 0.10 ± 0.05 dex, resulting in a Bayes factor of 11.9 in favour of a Chabrier IMF. The dark matter halo is roughly spherical, with minor to major axis ratio q3, h= 0.91+0.15- 0.13. The dark matter halo has a maximum circular velocity of Vmax= 276+17- 18 km s-1, and a central density parameter of log10ΔV/2= 5.9+0.9- 0.5. This is higher than predicted for uncontracted dark matter haloes in Λ cold dark matter cosmologies, log10ΔV/2= 5.2, suggesting that either the halo has contracted in response to galaxy formation, or that the halo has a higher than average concentration. Larger samples of spiral galaxy strong gravitational lenses are needed in order to distinguish between these two possibilities. At 2.2 disc scalelengths the dark matter fraction is fDM= 0.55+0.20- 0.15, suggesting that SDSS J2141-0001 is submaximal. Based in part on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. These observations are associated with programmes 10587 and 11978.

AB - The degeneracy among the disc, bulge and halo contributions to galaxy rotation curves prevents an understanding of the distribution of baryons and dark matter in disc galaxies. In an attempt to break this degeneracy, we present an analysis of the strong gravitational lens SDSS J2141-0001, discovered as part of the Sloan Lens ACS survey. The lens galaxy is a high-inclination, disc-dominated system. We present new Hubble Space Telescope multicolour imaging, gas and stellar kinematics data derived from long-slit spectroscopy and K-band laser guide star adaptive optics imaging, both from the Keck telescopes. We model the galaxy as a sum of concentric axisymmetric bulge, disc and halo components and infer the contribution of each component, using information from gravitational lensing and gas kinematics. This analysis yields a best-fitting total (disc plus bulge) stellar mass of log10(M*/M⊙) = 10.99+0.11- 0.25. The photometric data combined with stellar population synthesis models yield log10(M*/M⊙) = 10.97 ± 0.07 and 11.21 ± 0.07 for the Chabrier and Salpeter initial mass functions (IMFs), respectively. Assuming no cold gas, a Salpeter IMF is marginally disfavoured, with a Bayes factor of 2.7. Accounting for the expected gas fraction of ≃ 20 per cent reduces the lensing plus kinematics stellar mass by 0.10 ± 0.05 dex, resulting in a Bayes factor of 11.9 in favour of a Chabrier IMF. The dark matter halo is roughly spherical, with minor to major axis ratio q3, h= 0.91+0.15- 0.13. The dark matter halo has a maximum circular velocity of Vmax= 276+17- 18 km s-1, and a central density parameter of log10ΔV/2= 5.9+0.9- 0.5. This is higher than predicted for uncontracted dark matter haloes in Λ cold dark matter cosmologies, log10ΔV/2= 5.2, suggesting that either the halo has contracted in response to galaxy formation, or that the halo has a higher than average concentration. Larger samples of spiral galaxy strong gravitational lenses are needed in order to distinguish between these two possibilities. At 2.2 disc scalelengths the dark matter fraction is fDM= 0.55+0.20- 0.15, suggesting that SDSS J2141-0001 is submaximal. Based in part on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. These observations are associated with programmes 10587 and 11978.

KW - gravitational lensing: strong

KW - galaxies: fundamental parameters

KW - galaxies: haloes

KW - galaxies: kinematics and dynamics

KW - galaxies: spiral

KW - galaxies: structure

KW - DARK-MATTER HALOES

KW - SURFACE BRIGHTNESS GALAXIES

KW - RESOLUTION ROTATION CURVES

KW - INITIAL MASS FUNCTION

KW - DIGITAL SKY SURVEY

KW - UNIVERSAL DENSITY PROFILE

KW - TULLY-FISHER RELATION

KW - TO-LIGHT RATIOS

KW - ACS SURVEY

KW - IRREGULAR GALAXIES

UR - http://adsabs.harvard.edu/abs/2011MNRAS.417.1621D

U2 - 10.1111/j.1365-2966.2011.18706.x

DO - 10.1111/j.1365-2966.2011.18706.x

M3 - Article

VL - 417

SP - 1621

EP - 1642

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -

ID: 5442563