Publication

Red nuggets grow inside-out: evidence from gravitational lensing

Oldham, L., Auger, M. W., Fassnacht, C. D., Treu, T., Brewer, B. J., Koopmans, L. V. E., Lagattuta, D., Marshall, P., McKean, J. & Vegetti, S., Mar-2017, In : Monthly Notices of the Royal Astronomical Society. 465, 3, p. 3185-3202 18 p.

Research output: Contribution to journalArticleAcademicpeer-review

APA

Oldham, L., Auger, M. W., Fassnacht, C. D., Treu, T., Brewer, B. J., Koopmans, L. V. E., ... Vegetti, S. (2017). Red nuggets grow inside-out: evidence from gravitational lensing. Monthly Notices of the Royal Astronomical Society, 465(3), 3185-3202. https://doi.org/10.1093/mnras/stw2832

Author

Oldham, Lindsay ; Auger, Matthew W. ; Fassnacht, Christopher D. ; Treu, Tommaso ; Brewer, Brendon J. ; Koopmans, L. V. E. ; Lagattuta, David ; Marshall, Philip ; McKean, John ; Vegetti, Simona. / Red nuggets grow inside-out: evidence from gravitational lensing. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 465, No. 3. pp. 3185-3202.

Harvard

Oldham, L, Auger, MW, Fassnacht, CD, Treu, T, Brewer, BJ, Koopmans, LVE, Lagattuta, D, Marshall, P, McKean, J & Vegetti, S 2017, 'Red nuggets grow inside-out: evidence from gravitational lensing', Monthly Notices of the Royal Astronomical Society, vol. 465, no. 3, pp. 3185-3202. https://doi.org/10.1093/mnras/stw2832

Standard

Red nuggets grow inside-out: evidence from gravitational lensing. / Oldham, Lindsay; Auger, Matthew W.; Fassnacht, Christopher D.; Treu, Tommaso; Brewer, Brendon J.; Koopmans, L. V. E.; Lagattuta, David; Marshall, Philip; McKean, John; Vegetti, Simona.

In: Monthly Notices of the Royal Astronomical Society, Vol. 465, No. 3, 03.2017, p. 3185-3202.

Research output: Contribution to journalArticleAcademicpeer-review

Vancouver

Oldham L, Auger MW, Fassnacht CD, Treu T, Brewer BJ, Koopmans LVE et al. Red nuggets grow inside-out: evidence from gravitational lensing. Monthly Notices of the Royal Astronomical Society. 2017 Mar;465(3):3185-3202. https://doi.org/10.1093/mnras/stw2832


BibTeX

@article{e54a7df798ed45f5abb0e12e45cb52d6,
title = "Red nuggets grow inside-out: evidence from gravitational lensing",
abstract = "We present a new sample of strong gravitational lens systems where both the foreground lenses and background sources are early-type galaxies. Using imaging from Hubble Space Telescope (HST)/Advanced Camera for Studies (ACS) and Keck/NIRC2, we model the surface brightness distributions and show that the sources form a distinct population of massive, compact galaxies at redshifts 0.4 ≲ z ≲ 0.7, lying systematically below the size-mass relation of the global elliptical galaxy population at those redshifts. These may therefore represent relics of high-redshift red nuggets or their partly evolved descendants. We exploit the magnifying effect of lensing to investigate the structural properties, stellar masses and stellar populations of these objects with a view to understanding their evolution. We model these objects parametrically and find that they generally require two S{\'e}rsic components to properly describe their light profiles, with one more spheroidal component alongside a more envelope-like component, which is slightly more extended though still compact. This is consistent with the hypothesis of the inside-out growth of these objects via minor mergers. We also find that the sources can be characterized by red-to-blue colour gradients as a function of radius which are stronger at low redshift - indicative of ongoing accretion - but that their environments generally appear consistent with that of the general elliptical galaxy population, contrary to recent suggestions that these objects are pre-dominantly associated with clusters.",
keywords = "gravitational lensing: strong, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: structure, SIZE EVOLUTION, SURFACE PHOTOMETRY, EARLY-TYPE GALAXIES, COMPACT MASSIVE GALAXIES, DIGITAL SKY SURVEY, VELOCITY-DISPERSION EVOLUTION, SIMILAR-TO 2, QUIESCENT GALAXIES, HIGH-REDSHIFT, ELLIPTIC GALAXIES",
author = "Lindsay Oldham and Auger, {Matthew W.} and Fassnacht, {Christopher D.} and Tommaso Treu and Brewer, {Brendon J.} and Koopmans, {L. V. E.} and David Lagattuta and Philip Marshall and John McKean and Simona Vegetti",
year = "2017",
month = "3",
doi = "10.1093/mnras/stw2832",
language = "English",
volume = "465",
pages = "3185--3202",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

RIS

TY - JOUR

T1 - Red nuggets grow inside-out: evidence from gravitational lensing

AU - Oldham, Lindsay

AU - Auger, Matthew W.

AU - Fassnacht, Christopher D.

AU - Treu, Tommaso

AU - Brewer, Brendon J.

AU - Koopmans, L. V. E.

AU - Lagattuta, David

AU - Marshall, Philip

AU - McKean, John

AU - Vegetti, Simona

PY - 2017/3

Y1 - 2017/3

N2 - We present a new sample of strong gravitational lens systems where both the foreground lenses and background sources are early-type galaxies. Using imaging from Hubble Space Telescope (HST)/Advanced Camera for Studies (ACS) and Keck/NIRC2, we model the surface brightness distributions and show that the sources form a distinct population of massive, compact galaxies at redshifts 0.4 ≲ z ≲ 0.7, lying systematically below the size-mass relation of the global elliptical galaxy population at those redshifts. These may therefore represent relics of high-redshift red nuggets or their partly evolved descendants. We exploit the magnifying effect of lensing to investigate the structural properties, stellar masses and stellar populations of these objects with a view to understanding their evolution. We model these objects parametrically and find that they generally require two Sérsic components to properly describe their light profiles, with one more spheroidal component alongside a more envelope-like component, which is slightly more extended though still compact. This is consistent with the hypothesis of the inside-out growth of these objects via minor mergers. We also find that the sources can be characterized by red-to-blue colour gradients as a function of radius which are stronger at low redshift - indicative of ongoing accretion - but that their environments generally appear consistent with that of the general elliptical galaxy population, contrary to recent suggestions that these objects are pre-dominantly associated with clusters.

AB - We present a new sample of strong gravitational lens systems where both the foreground lenses and background sources are early-type galaxies. Using imaging from Hubble Space Telescope (HST)/Advanced Camera for Studies (ACS) and Keck/NIRC2, we model the surface brightness distributions and show that the sources form a distinct population of massive, compact galaxies at redshifts 0.4 ≲ z ≲ 0.7, lying systematically below the size-mass relation of the global elliptical galaxy population at those redshifts. These may therefore represent relics of high-redshift red nuggets or their partly evolved descendants. We exploit the magnifying effect of lensing to investigate the structural properties, stellar masses and stellar populations of these objects with a view to understanding their evolution. We model these objects parametrically and find that they generally require two Sérsic components to properly describe their light profiles, with one more spheroidal component alongside a more envelope-like component, which is slightly more extended though still compact. This is consistent with the hypothesis of the inside-out growth of these objects via minor mergers. We also find that the sources can be characterized by red-to-blue colour gradients as a function of radius which are stronger at low redshift - indicative of ongoing accretion - but that their environments generally appear consistent with that of the general elliptical galaxy population, contrary to recent suggestions that these objects are pre-dominantly associated with clusters.

KW - gravitational lensing: strong

KW - galaxies: elliptical and lenticular

KW - cD

KW - galaxies: evolution

KW - galaxies: structure

KW - SIZE EVOLUTION

KW - SURFACE PHOTOMETRY

KW - EARLY-TYPE GALAXIES

KW - COMPACT MASSIVE GALAXIES

KW - DIGITAL SKY SURVEY

KW - VELOCITY-DISPERSION EVOLUTION

KW - SIMILAR-TO 2

KW - QUIESCENT GALAXIES

KW - HIGH-REDSHIFT

KW - ELLIPTIC GALAXIES

U2 - 10.1093/mnras/stw2832

DO - 10.1093/mnras/stw2832

M3 - Article

VL - 465

SP - 3185

EP - 3202

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -

ID: 52746806