Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/222144
Title: Limits on dark matter compact objects implied by supermagnified stars in lensing clusters
Author: Vall Müller, Claudi
Miralda Escudé, Jordi
Keywords: Matèria fosca (Astronomia)
Lents
Gravitació
Dark matter (Astronomy)
Lenses
Gravitation
Issue Date: 17-Dec-2024
Publisher: Royal Astronomical Society
Abstract: Supermagnified stars are gravitationally lensed individual stars that are located close to a caustic of a lensing galaxy cluster, and have their flux magnified by a large enough factor (typically ⁠) to make them detectable with present telescopes. The maximum magnification is limited by microlensing caused by intracluster stars or other compact objects, which create a network of corrugated critical lines with an angular width proportional to the surface density of microlenses. We consider a set of nine cases of supermagnified stars reported in the literature, and derive an upper limit on the surface density of compact objects, such as primordial black holes, that might be present as a fraction of the dark matter in addition to known intracluster stars. Any such additional compact objects would widen the corrugated critical line network and therefore the width of the distribution of supermagnified stars around the modelled critical lines of the lens. We find that any compact objects, including primordial black holes, with masses above (below which the microcaustics are closer together than the typical angular size of supermagnified stars) cannot account for more than per cent of the dark matter.
Note: Reproducció del document publicat a: https://doi.org/10.1093/mnras/stae2652
It is part of: Monthly Notices of the Royal Astronomical Society, 2024, vol. 536, num.2, p. 1579-1585
URI: https://hdl.handle.net/2445/222144
Related resource: https://doi.org/10.1093/mnras/stae2652
ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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