Observing molecular clouds in halo dark clusters through absorption lines |
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| Authors: | F De Paolis G Ingrosso Ph Jetzer M Roncadelli |
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| Institution: | (1) Dipartimento di Fisica and INFN, Università degli Studi di Lecce, Via Arnesano CP 193, I-73100 Lecce, Italy;(2) Institute of Theoretical Physics, Univesity of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;(3) Sezione de Pavia, INFN, Via Bassi 6, I-27100 Pavia, Italy |
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| Abstract: | In addition to Massive Astrophysical Compact Halo Objects (MACHOs), as detected by microlensing, cold molecular clouds (mainly ofH
2) may well contribute substantially to the galactic halo dark matter. Here, we argue that the existence of such halo clouds can be inferred from the observation of absorption lines (due to heavy molecules located in the clouds themselves) towards stars of the Large Magellanic Cloud, which lie very close, within  1 , to a previously microlensed one.The possibility of clusters of MACHOs has been investigated by several authors (see e.g. Carr and Lacey, 1987; Ashman, 1990; Eichler and Silk, 1992 and Wasserman and Salpeter, 1994). |
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