Stellar Distributions as a Function of I-band Magnitude

Details Stellar Distributions as a Function of I-band Magnitude Stellar Distributions as a Function of I-band Magnitude

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460302d&link_type=abstract

American Astronomical Society, AAS Meeting #214, #603.02

Statistics

Scientific paper

Determining general statistics on the number of stars in each 1.5 square arcsecond Joint Milliarcsecond Pathfinder Survey (J-MAPS) frame as a function of I-band magnitude is is critical to setting parameters and requirements for J-MAPS, such as the integration time of the J-MAPS detector or the magnitude of the mission's guide stars. To develop a general understanding of the distributions of stars of each I-band magnitude over all 1.5 square arcsecond frames, this simulation uses two sets of 1 million randomly pointed frames blanketing the entire sky to obtain a realistic distribution of images over the sky. The USNO NOMAD catalog is used to determine each star's spectral type and then I-band magnitude; each star is then counted in every randomly pointed frame that includes the star. This process is repeated for the second set of 1 million randomly pointed frames to verify the results from the first simulation. Distribution statistics over two sets of simulated 1.5 square arcsecond frames are reported as a function of both non-cumulative and cumulative Cousin's I-band magnitude. We find the most populated frames lie along the galactic plane, with the most heavily populated frame covering the galactic center and including 33,662 stars of I-band magnitude of 17.5 or brighter at the 2 sigma level. We also find a minimum 14 stars per frame of I-band magnitude 10.5 or brighter at the 2 sigma level on which to guide the J-MAPS detector.

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