OBSERVATIONAL LIMITS ON MACHOS IN THE GALACTIC HALO

Authors
RENAULT C AFONSO C AUBOURG E BAREYRE P BAUER F BREHIN S COUTURES C GAUCHEREL C GLICENSTEIN JF GOLDMAN B GROS M HARDIN D DEKAT J LACHIEZEREY M LAURENT B LESQUOY E MAGNEVILLE C MILSZTAJN A MOSCOSO L PALANQUEDELABROUILLE N QUEINNEC F RICH J SPIRO M VIGROUX L ZYLBERAJCH S ANSARI R CAVALIER F COUCHOT F MANSOUX B MONIEZ M PERDEREAU O BEAULIEU JP FERLET R GRISON P VIDALMADJAR A GUIBERT J MOREAU O MAURICE E PREVOT L GRY C CHAR S FERNANDEZ J BOUTREUX T BURNAGE R DELAPPARENT V MASSET F MOUILLET D NITSCHELM C POINSIGNON J
Citation
C. Renault et al., OBSERVATIONAL LIMITS ON MACHOS IN THE GALACTIC HALO, Astronomy and astrophysics, 324(3), 1997, pp. 69-72
Citations number
20
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
324
Issue
3
Year of publication
1997
Pages
69 - 72
Database
ISI
SICI code
0004-6361(1997)324:3<69:OLOMIT>2.0.ZU;2-H
Abstract
We present final results from the first phase of the EROS search for g ravitational microlensing of stars in the Magellanic Clouds by unseen deflectors (machos: MAssive Compact Halo Objects). The search is sensi tive to events with time scales between 15 minutes and 200 days corres ponding to deflector masses in the range 10(-7) to a few M.. Two event s were observed that are compatible with microlensing by objects of ma ss approximate to 0.1 M.. By comparing the results with the expected n umber of events for various models of the Galaxy, we conclude that mac hos in the mass range [10(-7), 0.02] M. make up less than 20% (95% C.L .) of the Halo dark matter.