1999ApJS..124..171A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST14:57:11

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 - 2020
#notes
1 MACHO 95-BLG-38 Lev 17 59 41.9 -28 12 10           ~ 2 0
2 MACHO 95-21 Lev 17 59 42.3 -28 08 42     20.7     ~ 3 0
3 MACHO 97-BLG-28 Lev 18 00 33.9 -28 01 10     18.1     ~ 30 0
4 MACHO 95-BLG-d4 Lev 18 00 34.4 -28 33 30     19.92     ~ 1 0
5 MACHO 95-BLG-d3 Lev 18 00 35.6 -28 38 14     19.13     ~ 1 0
6 MACHO 97-BLG-d3 Lev 18 00 36.1 -28 32 34     18.38     ~ 1 0
7 MACHO 96-BLG-d1 Lev 18 00 36.1 -27 58 30     19.41     ~ 1 0
8 MACHO 97-BLG-51 Lev 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 Lev 18 00 49.9 -27 58 44     18.94     ~ 1 0
11 MACHO 96-BLG-16 Lev 18 01 09.0 -27 57 59     18.34     ~ 2 0
12 MACHO 95-BLG-d2 Lev 18 01 13.8 -28 01 25     20.13     ~ 1 0
13 MACHO 95-BLG-14 Lev 18 01 26.3 -28 31 14     17.67     ~ 4 0
14 MACHO 97-BLG-d1 Lev 18 01 30.9 -28 32 16     19.62     ~ 1 0
15 MACHO 95-BLG-d5 Lev 18 01 47.1 -28 21 26     19.28     ~ 1 0
16 MACHO 95-BLG-33 Lev 18 01 57.1 -28 08 06     19.14     ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-14:57:11

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