The external shear acting on gravitational lens B1422+231

Tomislav Kundić, David W. Hogg, Roger D. Blandford, Judith G. Cohen, Lori M. Lubin, James E. Larkin

    Research output: Contribution to journalArticle

    Abstract

    In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens. As part of an ongoing effort to gather observational data on these systems, we present spectroscopy and near-infrared and optical photometry of galaxies in the field of the quadruple lens system B1422+231. The spectra show that the primary lens and five nearby galaxies belong to a compact group at z = 0.338. The median projected radius of this group is 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M, which provides sufficient external shear to produce the observed image configuration. This data rules out a class of models and improves the system's prospects for a measurement of the Hubble constant.

    Original languageEnglish (US)
    Pages (from-to)2276-2283
    Number of pages8
    JournalAstronomical Journal
    Volume114
    Issue number6
    StatePublished - Dec 1997

    Fingerprint

    gravitational lenses
    shear
    lenses
    galaxies
    near infrared
    spectroscopy
    infrared photometry
    virial theorem
    Hubble constant
    quasars
    photometry
    radii
    configurations

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Kundić, T., Hogg, D. W., Blandford, R. D., Cohen, J. G., Lubin, L. M., & Larkin, J. E. (1997). The external shear acting on gravitational lens B1422+231. Astronomical Journal, 114(6), 2276-2283.

    The external shear acting on gravitational lens B1422+231. / Kundić, Tomislav; Hogg, David W.; Blandford, Roger D.; Cohen, Judith G.; Lubin, Lori M.; Larkin, James E.

    In: Astronomical Journal, Vol. 114, No. 6, 12.1997, p. 2276-2283.

    Research output: Contribution to journalArticle

    Kundić, T, Hogg, DW, Blandford, RD, Cohen, JG, Lubin, LM & Larkin, JE 1997, 'The external shear acting on gravitational lens B1422+231', Astronomical Journal, vol. 114, no. 6, pp. 2276-2283.
    Kundić T, Hogg DW, Blandford RD, Cohen JG, Lubin LM, Larkin JE. The external shear acting on gravitational lens B1422+231. Astronomical Journal. 1997 Dec;114(6):2276-2283.
    Kundić, Tomislav ; Hogg, David W. ; Blandford, Roger D. ; Cohen, Judith G. ; Lubin, Lori M. ; Larkin, James E. / The external shear acting on gravitational lens B1422+231. In: Astronomical Journal. 1997 ; Vol. 114, No. 6. pp. 2276-2283.
    @article{73f938d25d0e4c2c910c16aa7c6f1ae6,
    title = "The external shear acting on gravitational lens B1422+231",
    abstract = "In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens. As part of an ongoing effort to gather observational data on these systems, we present spectroscopy and near-infrared and optical photometry of galaxies in the field of the quadruple lens system B1422+231. The spectra show that the primary lens and five nearby galaxies belong to a compact group at z = 0.338. The median projected radius of this group is 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M⊙, which provides sufficient external shear to produce the observed image configuration. This data rules out a class of models and improves the system's prospects for a measurement of the Hubble constant.",
    author = "Tomislav Kundić and Hogg, {David W.} and Blandford, {Roger D.} and Cohen, {Judith G.} and Lubin, {Lori M.} and Larkin, {James E.}",
    year = "1997",
    month = "12",
    language = "English (US)",
    volume = "114",
    pages = "2276--2283",
    journal = "Astronomical Journal",
    issn = "0004-6256",
    publisher = "IOP Publishing Ltd.",
    number = "6",

    }

    TY - JOUR

    T1 - The external shear acting on gravitational lens B1422+231

    AU - Kundić, Tomislav

    AU - Hogg, David W.

    AU - Blandford, Roger D.

    AU - Cohen, Judith G.

    AU - Lubin, Lori M.

    AU - Larkin, James E.

    PY - 1997/12

    Y1 - 1997/12

    N2 - In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens. As part of an ongoing effort to gather observational data on these systems, we present spectroscopy and near-infrared and optical photometry of galaxies in the field of the quadruple lens system B1422+231. The spectra show that the primary lens and five nearby galaxies belong to a compact group at z = 0.338. The median projected radius of this group is 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M⊙, which provides sufficient external shear to produce the observed image configuration. This data rules out a class of models and improves the system's prospects for a measurement of the Hubble constant.

    AB - In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens. As part of an ongoing effort to gather observational data on these systems, we present spectroscopy and near-infrared and optical photometry of galaxies in the field of the quadruple lens system B1422+231. The spectra show that the primary lens and five nearby galaxies belong to a compact group at z = 0.338. The median projected radius of this group is 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M⊙, which provides sufficient external shear to produce the observed image configuration. This data rules out a class of models and improves the system's prospects for a measurement of the Hubble constant.

    UR - http://www.scopus.com/inward/record.url?scp=0005899272&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0005899272&partnerID=8YFLogxK

    M3 - Article

    VL - 114

    SP - 2276

    EP - 2283

    JO - Astronomical Journal

    JF - Astronomical Journal

    SN - 0004-6256

    IS - 6

    ER -