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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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