Discovery of a high-redshift Einstein ring

R. A. Cabanac; D. Valls-Gabaud; A. O. Jaunsen; C. Lidman; H. Jerjen

doi:10.1051/0004-6361:200500115

Discovery of a high-redshift Einstein ring

R. A. Cabanac^*, D. Valls-Gabaud, A. O. Jaunsen, C. Lidman, H. Jerjen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

We report the discovery of a partial Einstein ring of radius 1.″48 produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy at z = 0.986, which is lensing a post-starburst galaxy at z = 3.773. This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, (8.3 ± 0.4) × 10¹¹h_-10^-1 M_odot;. The fundamental plane relation indicates an evolution rate of dlog(M/L)_B/dz = -0.57 ± 0.04, similar to other massive ellipticals at this redshift. The source galaxy shows strong interstellar absorption lines indicative of large gas-phase metallicities, with fading stellar populations after a burst. Higher resolution spectra and imaging will allow the detailed study of an unbiased representative of the galaxy population when the universe was just 12% of its current age.

Original language	English
Pages (from-to)	L21-L25
Journal	Astronomy and Astrophysics
Volume	436
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:200500115
Publication status	Published - Jun 2005

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title = "Discovery of a high-redshift Einstein ring",

abstract = "We report the discovery of a partial Einstein ring of radius 1.″48 produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy at z = 0.986, which is lensing a post-starburst galaxy at z = 3.773. This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, (8.3 ± 0.4) × 1011h-10-1 Modot;. The fundamental plane relation indicates an evolution rate of dlog(M/L)B/dz = -0.57 ± 0.04, similar to other massive ellipticals at this redshift. The source galaxy shows strong interstellar absorption lines indicative of large gas-phase metallicities, with fading stellar populations after a burst. Higher resolution spectra and imaging will allow the detailed study of an unbiased representative of the galaxy population when the universe was just 12% of its current age.",

keywords = "Cosmology: observations, Ellipticals, Evolution, FOR J0332-3557, Galaxies: high-redshift, Gravitational lensing",

author = "Cabanac, {R. A.} and D. Valls-Gabaud and Jaunsen, {A. O.} and C. Lidman and H. Jerjen",

year = "2005",

month = jun,

doi = "10.1051/0004-6361:200500115",

language = "English",

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T1 - Discovery of a high-redshift Einstein ring

AU - Cabanac, R. A.

AU - Valls-Gabaud, D.

AU - Jaunsen, A. O.

AU - Lidman, C.

AU - Jerjen, H.

PY - 2005/6

Y1 - 2005/6

N2 - We report the discovery of a partial Einstein ring of radius 1.″48 produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy at z = 0.986, which is lensing a post-starburst galaxy at z = 3.773. This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, (8.3 ± 0.4) × 1011h-10-1 Modot;. The fundamental plane relation indicates an evolution rate of dlog(M/L)B/dz = -0.57 ± 0.04, similar to other massive ellipticals at this redshift. The source galaxy shows strong interstellar absorption lines indicative of large gas-phase metallicities, with fading stellar populations after a burst. Higher resolution spectra and imaging will allow the detailed study of an unbiased representative of the galaxy population when the universe was just 12% of its current age.

AB - We report the discovery of a partial Einstein ring of radius 1.″48 produced by a massive (and seemingly isolated) elliptical galaxy. The spectroscopic follow-up at the VLT reveals a 2L* galaxy at z = 0.986, which is lensing a post-starburst galaxy at z = 3.773. This unique configuration yields a very precise measure of the mass of the lens within the Einstein radius, (8.3 ± 0.4) × 1011h-10-1 Modot;. The fundamental plane relation indicates an evolution rate of dlog(M/L)B/dz = -0.57 ± 0.04, similar to other massive ellipticals at this redshift. The source galaxy shows strong interstellar absorption lines indicative of large gas-phase metallicities, with fading stellar populations after a burst. Higher resolution spectra and imaging will allow the detailed study of an unbiased representative of the galaxy population when the universe was just 12% of its current age.

KW - Cosmology: observations

KW - Ellipticals

KW - Evolution

KW - FOR J0332-3557

KW - Galaxies: high-redshift

KW - Gravitational lensing

UR - http://www.scopus.com/inward/record.url?scp=20544435482&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:200500115

DO - 10.1051/0004-6361:200500115

M3 - Article

SN - 0004-6361

VL - 436

SP - L21-L25

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Discovery of a high-redshift Einstein ring

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