Abstract:
In 1996 EROS 2 launched a proper motion survey, in order to detect
massive compact objects that may compose the Galactic halo. We
observed 350 square degrees with 3 or more epochs, using the EROS 2
two-color wide field imager. With sensitivity down to I~20.5mag and
V~21.5mag, and proper motion errors in the order of 0.05"/yr over two
years, we are able to detect in the Solar neighbourhood, faint halo
white dwarfs, as well as fast, cool disk objects, such as brown
dwarfs.
In this talk I shall present the results of our survey regarding the
composition of the Galactic halo in cool white dwarfs.
Keywords:
Galaxy: halo - Galaxy: kinematics and dynamics - dark matter - stars: white dwarfs
Comments:
10 slides, 5 postscript figures
Talk:
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Text slides: |
Postscript (111 kb) |
Gzipped postscript (15 kb) |
Gif image (75 kb) |
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Figures: |
Postscript (1.7 Mb) |
Gzipped postscript (451 kb) |
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slide 1: Title
slide 2: Scientific Context slide 3: Method slide 4: The Survey slide 5: distribution of fields on the sky
(gzipped postscript)slide 6: Precision slide 7: proper motion precision along a and d
for the red and visible bands (gzipped postscript)slide 8: Selection Cuts slide 9: Efficiency slide 10: Disk and Halo expectations slide 11: proper motion vs. magnitude
for various disk and halo models (gzipped postscript)slide 12: Results on the WD composition
of the Galactic Haloslide 13: number of expected candidates and constraints slide 14: Prospects
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B.Goldman, March 17, 2000. |
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