Publication

The influence of central black holes on gravitational lenses

Mao, S., Witt, H. J. & Koopmans, L. V. E., 1-May-2001, In : Monthly Notices of the Royal Astronomical Society. 323, 2, p. 301-307 7 p.

Research output: Contribution to journalArticleAcademicpeer-review

Recent observations indicate that many if not all galaxies host massive central black holes. In this paper we explore the influence of black holes on the lensing properties. We model the lens as an isothermal ellipsoid with a finite core radius plus a central black hole. We show that the presence of the black hole substantially changes the critical curves and caustics. If the black hole mass is above a critical value, then it will completely suppress the central images for all source positions. Realistic central black holes are likely to have masses below this critical value. Even in such subcritical cases, the black hole can suppress the central image when the source is inside a zone of influence, which depends on the core radius and black hole mass. In the subcritical cases, an additional image may be created by the black hole in some regions, which for some radio lenses may be detectable with high-resolution and large dynamic range VLBI maps. The presence of central black holes should also be taken into account when one constrains the core radius from the lack of central images in gravitational lenses.
Original languageEnglish
Pages (from-to)301-307
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume323
Issue number2
Publication statusPublished - 1-May-2001
Externally publishedYes

    Keywords

  • GRAVITATIONAL LENSING, GALAXIES: NUCLEI, GALAXIES: STRUCTURE, COSMOLOGY: THEORY, DARK MATTER, Astrophysics

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