1997A&A...324..843A


Query : 1997A&A...324..843A

1997A&A...324..843A - Astronomy and Astrophysics, volume 324, 843-856 (1997/8-3)

AGAPE: a search for dark matter towards M 31 by microlensing effects on unresolved stars.

ANSARI R., AURIERE M., BAILLON P., BOUQUET A., COUPINOT G., COUTURES C., GHESQUIERE C., GIRAUD-HERAUD Y., GONDOLO P., HECQUET J., KAPLAN J., LE DU Y., MELCHIOR A.L., MONIEZ M., PICAT J.P. and SOUCAIL G.

Abstract (from CDS):

M 31 is a very tempting target for a microlensing search of compact objects in galactic haloes. It is the nearest large galaxy, it probably has its own dark halo, and its tilted position with respect to the line of sight provides an unmistakable signature of microlensing. However most stars of M 31 are not resolved and one has to use the "pixel method": monitor the pixels of the image rather than the stars. AGAPE is the implementation of this idea. Data have been collected and treated during two autumns of observation at the 2 metre telescope of Pic du Midi. The process of geometric and photometric alignment, which must be performed before constructing pixel light curves, is described. Seeing variations are minimised by working with large super-pixels (2.1") compared with the average seeing. A high level of stability of pixel fluxes, crucial to the approach, is reached. Fluctuations of super-pixels do not exceed 1.7 times the photon noise which is 0.1% of the intensity for the brightest ones. With such stable data, 10 microlensing events are expected for a full "standard halo". With a larger field, a regular and short time sampling and a long lever arm in time, the pixel method will be a very efficient tool to explore the halo of M 31.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - cosmology: observation - cosmology: dark matter - cosmology: gravitational lensing - galaxies: individual: M 31 - methods: observational

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11798 1
2 Cl* Melotte 22 TEIDE 1 LM* 03 47 17.9147300712 +24 22 31.746313740         19.26 M8.0 104 0
3 Cl* Melotte 22 PPL 15 LM* 03 48 04.6585327824 +23 39 30.318163560         17.91 M6.5 99 0
4 Cl* Melotte 22 PLIZ 12 LM* 03 51 25.5680723568 +23 45 21.465842004         19.00 M8.0 64 0
5 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 481 0
6 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 200 0
7 PG 1657+078 HS* 16 59 32.2150744512 +07 43 31.412466912 13.919 14.877 15.019 15.098 15.115 sdB 51 0

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2022.05.29-11:39:38

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