1999ApJS..124..171A

Query : 1999ApJS..124..171A

1999ApJS..124..171A - Astrophys. J., Suppl. Ser., 124, 171-179 (1999/September-0)

Difference image analysis of galactic microlensing. II. Microlensing events.

ALCOCK C., ALLSMAN R.A., ALVES D., AXELROD T.S., BECKER A.C., BENNETT D.P., COOK K.H., DRAKE A.J., FREEMAN K.C., GRIEST K., LEHNER M.J., MARSHALL S.L., MINNITI D., PETERSON B.A., PRATT M.R., QUINN P.J., STUBBS C.W., SUTHERLAND W., TOMANEY A., VANDEHEI T., WELCH D.L. (The MACHO Collaboration)

Abstract (from CDS):

The MACHO collaboration has been carrying out difference image analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing. This is a preliminary report on the application of DIA to galactic bulge images in one field. We show how the DIA technique significantly increases the number of detected lensing events, by removing the positional dependence of traditional photometry schemes and lowering the microlensing event detection threshold. This technique, unlike PSF photometry, gives the unblended colors and positions of the microlensing source stars. We present a set of criteria for selecting microlensing events from objects discovered with this technique. The 16 pixel and classical microlensing events discovered with the DIA technique are presented.

Abstract Copyright: ∼

Journal keyword(s): Atmospheric Effects - Galaxy: Stellar Content - Cosmology: Gravitational Lensing - Techniques: Image Processing

Nomenclature: Table 1: MACHO YY-BLG-dN N=8.

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MACHO 95-BLG-38 * 17 59 41.9 -28 12 10           ~ 2 0
2 MACHO 95-21 * 17 59 42.3 -28 08 42     20.7     ~ 3 0
3 MACHO 97-BLG-28 * 18 00 33.9 -28 01 10     18.1     ~ 31 0
4 MACHO 95-BLG-d4 * 18 00 34.4 -28 33 30     19.92     ~ 1 0
5 MACHO 95-BLG-d3 * 18 00 35.6 -28 38 14     19.13     ~ 1 0
6 MACHO 97-BLG-d3 * 18 00 36.1 -28 32 34     18.38     ~ 1 0
7 MACHO 96-BLG-d1 * 18 00 36.1 -27 58 30     19.41     ~ 1 0
8 MACHO 97-BLG-51 * 18 00 39.3 -27 58 35     20.56     ~ 1 0
9 OGLE BUL-SC21 833776 * 18 00 39.6 -28 34 43           ~ 3 0
10 MACHO 95-BLG-32 * 18 00 49.9 -27 58 44     18.94     ~ 1 0
11 MACHO 96-BLG-16 * 18 01 09.0 -27 57 59     18.34     ~ 2 0
12 MACHO 95-BLG-d2 * 18 01 13.8 -28 01 25     20.13     ~ 1 0
13 MACHO 95-BLG-14 * 18 01 26.3 -28 31 14     17.67     ~ 4 0
14 MACHO 97-BLG-d1 * 18 01 30.9 -28 32 16     19.62     ~ 1 0
15 MACHO 95-BLG-d5 * 18 01 47.1 -28 21 26     19.28     ~ 1 0
16 MACHO 95-BLG-33 * 18 01 57.1 -28 08 06     19.14     ~ 1 0

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