A nearly symmetric double-image gravitational lens

Joshua N. Winn; Jacqueline N. Hewitt; Alok R. Patnaik; Paul L. Schechter; Robert A. Schommer; Sebastian López; José Maza; Stefanie Wachter

doi:10.1086/319403

A nearly symmetric double-image gravitational lens

Joshua N. Winn, Jacqueline N. Hewitt, Alok R. Patnaik, Paul L. Schechter, Robert A. Schommer, Sebastian López, José Maza, Stefanie Wachter

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

21 Scopus citations

Abstract

We report the discovery of a new double-image gravitational lens, resulting from our search for lenses in the southern sky. Radio source PMN J2004-1349 is composed of two compact components separated by 1′.13 in VLA, MERLIN, and VLBA images. The components have a flux ratio of 1:1 at radio frequencies ranging from 5 to 22.5 GHz. The I-band optical counterpart is also an equal double, with roughly the same separation and position angle as the radio double. Upon subtraction of the components from the I-band image, we identify a dim pattern of residuals as the lens galaxy. While the present observations are sufficient to establish that PMN J2004-1349 is a gravitational lens, additional information will be necessary (such as the redshifts of the galaxy and quasar and precise astrometry and photometry of the lens galaxy) before constructing detailed mass models.

Original language	English (US)
Pages (from-to)	1223-1231
Number of pages	9
Journal	Astronomical Journal
Volume	121
Issue number	3
DOIs	https://doi.org/10.1086/319403
State	Published - Mar 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Distance scale
Gravitational lensing
Quasars: individual (PMN J2004-1349)

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10.1086/319403

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title = "A nearly symmetric double-image gravitational lens",

abstract = "We report the discovery of a new double-image gravitational lens, resulting from our search for lenses in the southern sky. Radio source PMN J2004-1349 is composed of two compact components separated by 1′.13 in VLA, MERLIN, and VLBA images. The components have a flux ratio of 1:1 at radio frequencies ranging from 5 to 22.5 GHz. The I-band optical counterpart is also an equal double, with roughly the same separation and position angle as the radio double. Upon subtraction of the components from the I-band image, we identify a dim pattern of residuals as the lens galaxy. While the present observations are sufficient to establish that PMN J2004-1349 is a gravitational lens, additional information will be necessary (such as the redshifts of the galaxy and quasar and precise astrometry and photometry of the lens galaxy) before constructing detailed mass models.",

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author = "Winn, {Joshua N.} and Hewitt, {Jacqueline N.} and Patnaik, {Alok R.} and Schechter, {Paul L.} and Schommer, {Robert A.} and Sebastian L{\'o}pez and Jos{\'e} Maza and Stefanie Wachter",

year = "2001",

month = mar,

doi = "10.1086/319403",

language = "English (US)",

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AU - Winn, Joshua N.

AU - Hewitt, Jacqueline N.

AU - Patnaik, Alok R.

AU - Schechter, Paul L.

AU - Schommer, Robert A.

AU - López, Sebastian

AU - Maza, José

AU - Wachter, Stefanie

PY - 2001/3

Y1 - 2001/3

N2 - We report the discovery of a new double-image gravitational lens, resulting from our search for lenses in the southern sky. Radio source PMN J2004-1349 is composed of two compact components separated by 1′.13 in VLA, MERLIN, and VLBA images. The components have a flux ratio of 1:1 at radio frequencies ranging from 5 to 22.5 GHz. The I-band optical counterpart is also an equal double, with roughly the same separation and position angle as the radio double. Upon subtraction of the components from the I-band image, we identify a dim pattern of residuals as the lens galaxy. While the present observations are sufficient to establish that PMN J2004-1349 is a gravitational lens, additional information will be necessary (such as the redshifts of the galaxy and quasar and precise astrometry and photometry of the lens galaxy) before constructing detailed mass models.

AB - We report the discovery of a new double-image gravitational lens, resulting from our search for lenses in the southern sky. Radio source PMN J2004-1349 is composed of two compact components separated by 1′.13 in VLA, MERLIN, and VLBA images. The components have a flux ratio of 1:1 at radio frequencies ranging from 5 to 22.5 GHz. The I-band optical counterpart is also an equal double, with roughly the same separation and position angle as the radio double. Upon subtraction of the components from the I-band image, we identify a dim pattern of residuals as the lens galaxy. While the present observations are sufficient to establish that PMN J2004-1349 is a gravitational lens, additional information will be necessary (such as the redshifts of the galaxy and quasar and precise astrometry and photometry of the lens galaxy) before constructing detailed mass models.

KW - Distance scale

KW - Gravitational lensing

KW - Quasars: individual (PMN J2004-1349)

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JF - Astronomical Journal

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ER -

A nearly symmetric double-image gravitational lens

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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