The effect of low-mass substructures on the cusp lensing relation

Andrea Maccio, Marco Miranda

    Research output: Contribution to journalArticle

    Abstract

    It has been argued that the flux anomalies detected in gravitationally lensed quasi-stellar objects (QSOs) are evidence for substructures in the foreground lensing haloes. In this paper, we investigate this issue in greater detail, focusing on the cusp relation which corresponds to images of a source located to the cusp of the inner caustic curve. We use numerical simulations combined with a Monte Carlo approach to study the effects of the expected power-law distribution of substructures within A cold dark matter (ACDM) haloes on the multiple images. Generally, the high number of anomalous flux ratios in the cusp configurations is unlikely to be explained by 'simple' perturbers (subhaloes) inside the lensing galaxy, modelled by either point masses or extended Navarro, Frenk & White subhaloes. We considered in our analysis a mass range of 105-107 M for the subhaloes. We also demonstrate that including the effects of the surrounding mass distribution, such as other galaxies close to the primary lens, does not change the results. We conclude that triple images of lensed QSOs do not show any direct evidence for dark dwarf galaxies such as CDM substructure.

    Original languageEnglish (US)
    Pages (from-to)599-608
    Number of pages10
    JournalMonthly Notices of the Royal Astronomical Society
    Volume368
    Issue number2
    DOIs
    StatePublished - May 1 2006

    Fingerprint

    substructures
    cusps
    halos
    galaxies
    power law distribution
    dwarf galaxies
    mass distribution
    alkalies
    dark matter
    lenses
    anomalies
    anomaly
    curves
    configurations
    simulation
    effect

    Keywords

    • Cosmology: theory
    • Dark matter
    • Galaxies: haloes
    • Gravitational lensing
    • Methods: numerical

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    The effect of low-mass substructures on the cusp lensing relation. / Maccio, Andrea; Miranda, Marco.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 368, No. 2, 01.05.2006, p. 599-608.

    Research output: Contribution to journalArticle

    Maccio, Andrea ; Miranda, Marco. / The effect of low-mass substructures on the cusp lensing relation. In: Monthly Notices of the Royal Astronomical Society. 2006 ; Vol. 368, No. 2. pp. 599-608.
    @article{e8107f5d106b4c3b997be8d33500add7,
    title = "The effect of low-mass substructures on the cusp lensing relation",
    abstract = "It has been argued that the flux anomalies detected in gravitationally lensed quasi-stellar objects (QSOs) are evidence for substructures in the foreground lensing haloes. In this paper, we investigate this issue in greater detail, focusing on the cusp relation which corresponds to images of a source located to the cusp of the inner caustic curve. We use numerical simulations combined with a Monte Carlo approach to study the effects of the expected power-law distribution of substructures within A cold dark matter (ACDM) haloes on the multiple images. Generally, the high number of anomalous flux ratios in the cusp configurations is unlikely to be explained by 'simple' perturbers (subhaloes) inside the lensing galaxy, modelled by either point masses or extended Navarro, Frenk & White subhaloes. We considered in our analysis a mass range of 105-107 M⊙ for the subhaloes. We also demonstrate that including the effects of the surrounding mass distribution, such as other galaxies close to the primary lens, does not change the results. We conclude that triple images of lensed QSOs do not show any direct evidence for dark dwarf galaxies such as CDM substructure.",
    keywords = "Cosmology: theory, Dark matter, Galaxies: haloes, Gravitational lensing, Methods: numerical",
    author = "Andrea Maccio and Marco Miranda",
    year = "2006",
    month = "5",
    day = "1",
    doi = "10.1111/j.1365-2966.2006.10154.x",
    language = "English (US)",
    volume = "368",
    pages = "599--608",
    journal = "Monthly Notices of the Royal Astronomical Society",
    issn = "0035-8711",
    publisher = "Oxford University Press",
    number = "2",

    }

    TY - JOUR

    T1 - The effect of low-mass substructures on the cusp lensing relation

    AU - Maccio, Andrea

    AU - Miranda, Marco

    PY - 2006/5/1

    Y1 - 2006/5/1

    N2 - It has been argued that the flux anomalies detected in gravitationally lensed quasi-stellar objects (QSOs) are evidence for substructures in the foreground lensing haloes. In this paper, we investigate this issue in greater detail, focusing on the cusp relation which corresponds to images of a source located to the cusp of the inner caustic curve. We use numerical simulations combined with a Monte Carlo approach to study the effects of the expected power-law distribution of substructures within A cold dark matter (ACDM) haloes on the multiple images. Generally, the high number of anomalous flux ratios in the cusp configurations is unlikely to be explained by 'simple' perturbers (subhaloes) inside the lensing galaxy, modelled by either point masses or extended Navarro, Frenk & White subhaloes. We considered in our analysis a mass range of 105-107 M⊙ for the subhaloes. We also demonstrate that including the effects of the surrounding mass distribution, such as other galaxies close to the primary lens, does not change the results. We conclude that triple images of lensed QSOs do not show any direct evidence for dark dwarf galaxies such as CDM substructure.

    AB - It has been argued that the flux anomalies detected in gravitationally lensed quasi-stellar objects (QSOs) are evidence for substructures in the foreground lensing haloes. In this paper, we investigate this issue in greater detail, focusing on the cusp relation which corresponds to images of a source located to the cusp of the inner caustic curve. We use numerical simulations combined with a Monte Carlo approach to study the effects of the expected power-law distribution of substructures within A cold dark matter (ACDM) haloes on the multiple images. Generally, the high number of anomalous flux ratios in the cusp configurations is unlikely to be explained by 'simple' perturbers (subhaloes) inside the lensing galaxy, modelled by either point masses or extended Navarro, Frenk & White subhaloes. We considered in our analysis a mass range of 105-107 M⊙ for the subhaloes. We also demonstrate that including the effects of the surrounding mass distribution, such as other galaxies close to the primary lens, does not change the results. We conclude that triple images of lensed QSOs do not show any direct evidence for dark dwarf galaxies such as CDM substructure.

    KW - Cosmology: theory

    KW - Dark matter

    KW - Galaxies: haloes

    KW - Gravitational lensing

    KW - Methods: numerical

    UR - http://www.scopus.com/inward/record.url?scp=33646242248&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=33646242248&partnerID=8YFLogxK

    U2 - 10.1111/j.1365-2966.2006.10154.x

    DO - 10.1111/j.1365-2966.2006.10154.x

    M3 - Article

    VL - 368

    SP - 599

    EP - 608

    JO - Monthly Notices of the Royal Astronomical Society

    JF - Monthly Notices of the Royal Astronomical Society

    SN - 0035-8711

    IS - 2

    ER -