29 April 2003
The Bulge data for year 8 has been installed!
The RA/Dec in the LMC and SMC data which was accidentally truncated during packaging has been replaced with full precision RA/Dec.
The wrapper file format changed from the previous release, the data format
remained unchanged.
MACHO project is providing, via ftp, ascii files comprising statitical summary data for all stars within a Macho Field. Refer here for Macho Fields' RA/Dec boundary and Id.
The LMC data, SMC data and Bulge data contain comprehensive summary statistics on each star's complete (8 year) lightcurve. Data is delivered as gzip-compressed ascii files per Macho Field. Within each ascii file, each line contains data for a single star and each entry within the line is comma (',') delimited. Each gzip file is between 50MB - 110MB.
| Col | Label | Definition |
|---|---|---|
| 1 | id | MACHO star identification (field.tile.seq) |
| 2 | ra | Right Ascension in J2000 |
| 3 | dec | Declination in J2000 |
| 4 | npoints | number of observations on the tile |
| 5 | rN | red: number of good points on LC |
| 6 | rmagave | red: median magnitude of LC in instrumental units |
| 7 | rerrave | red: average error of measurements on LC in units of A, where A is the the measured flux divided by the median flux. |
| 8 | rsig | red: sqrt of variance of A-1 measurements over LC. |
| 9 | rchi2w | red: chi^2 per degree of freedom of fit to "constant flux" hypothesis weighted by flux errors |
| 10 | rqw | red: probability of getting value as large as rchi2w by chance |
| 11 | rNr | red: number of points on robustified LC |
| 12 | rerraver | red: average error on robustified LC |
| 13 | rchi2r | red: chi^2 per degree of freedom for robustified LC (variable star search) |
| 14 | rqr | red: probability of getting value as large as rchi2r by chance |
| 15 | rs5 | red: number of points on LC 5-sigma above median |
| 16 | rs5d | red: number of points on LC 5-sigma below median (eclipsing binary search) |
| 17 | rmagaveu | red: median magnitude in instrumental units before removing bad points |
| 18 | rdskyave | red: average of red dsky sodophot measure |
| 19 | rdskysig | red: sqrt of variance of red dsky sodophot measure |
| 20 | rpsfave | red: average over LC of sodophot measure of goodness of psf fit |
| 21 | rpsfsig | red: sqrt of variance of red psf sodophot measure |
| 22 | rcrdave | red: average of crowding sodophot measure |
| 23 | rcosmave | red: average of cosmic ray sodophot measure |
| 24 | rmissave | red: average of missing pixel sodophot measure |
| 25-44 | b... | blue: same as correspondingly named red quantity |
| 45 | bmrN | number of points on the B-R LC [aka simultaneous R/B pts] |
| 46 | rbcross | red/blue A-1 robustified measurements over LC cross correlation coefficient [Welch-Stetson; see AJ 105, 1813] |
| 47 | rauto | red: A-1 robustified measurements over LC autocorrelation (lag=0) coefficient |
| 48 | bauto | blue: A-1 robustified measurements over LC autocorrelation (lag=0) coefficient |
| 49 | filterN | number of filters applied; always 3 |
| 50 | filter[i].rfilmax | red: max value of optimum filter for LC |
| 51 | filter[i].rfiltime | red: LC time at which maximum occurred |
| 52 | filter[i].rNhi | red: number points sigmathreshold high within duration of filter at peak (rfiltime) |
| 50 | filter[i].bfilmax | blue: max value of optimum filter for LC |
| 51 | filter[i].bfiltime | blue: LC time at which maximum occurred |
| 52 | filter[i].bNhi | blue: number points sigmathreshold high within duration of filter at peak (bfiltime) |
| 53-... | filter[i+1].rfilmax | red: repeat the 6 filter quantities until all filterN sets accounted. |
| Filter | duration | sigmathreshold |
|---|---|---|
| 1 | 100 days | 1.3 sigma |
| 2 | 45 days | 1.5 sigma |
| 3 | 15 days | 2.0 sigma |
Acknowledgement to use when referencing MACHO Project data
"This paper utilizes public domain data originally obtained by the MACHO Project,
whose work was performed under the joint auspices of
the U.S. Department of Energy, National Nuclear Security Administration by the
University of California, Lawrence Livermore National Laboratory under contract No.
W-7405-Eng-48,
the National Science Foundation through the Center for Particle Astrophysics of the
University of California under cooperative agreement AST-8809616, and
the Mount Stromlo and Siding Spring Observatory, part of the Australian National University."