Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/222144
Limits on dark matter compact objects implied by supermagnified stars in lensing clusters
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
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.
Matèries
Matèries (anglès)
Citació
Citació
VALL MÜLLER, Claudi, MIRALDA ESCUDÉ, Jordi. Limits on dark matter compact objects implied by supermagnified stars in lensing clusters. _Monthly Notices of the Royal Astronomical Society_. 2024. Vol. 536, núm. 2, pàgs. 1579-1585. [consulta: 23 de gener de 2026]. ISSN: 0035-8711. [Disponible a: https://hdl.handle.net/2445/222144]