Not enough stellar Mass Machos in the Galactic Halo
T. Lasserre, et al, EROS Collaboration
TL;DR
This study combines microlensing survey results to constrain the presence of stellar-mass MACHOs in the Galactic halo, effectively ruling out their significant contribution if their mass is below one solar mass.
Contribution
It provides new combined upper limits on stellar-mass MACHOs in the Galactic halo, improving constraints over previous surveys.
Findings
Stellar-mass MACHOs are unlikely to be a major component of the Galactic halo.
The upper limit rules out MACHOs below 1 solar mass as significant dark matter candidates.
Combined data strengthens previous constraints on MACHO abundance.
Abstract
We combine new results from the search for microlensing towards the Large Magellanic Cloud (LMC) by EROS2 (Experience de Recherche d'Objets Sombres) with limits previously reported by EROS1 and EROS2 towards both Magellanic Clouds. The derived upper limit on the abundance of stellar mass MACHOs rules out such objects as an important component of the Galactic halo if their mass is smaller than 1 solar mass.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · History and Developments in Astronomy