The Intrinsic I-Band Magnitude Dispersion of the Galactic Bulge Red Clump

Details The Intrinsic I-Band Magnitude Dispersion of the Galactic Bulge Red Clump The Intrinsic I-Band Magnitude Dispersion of the Galactic Bulge Red Clump

2011-05-31

arxiv.org/abs/1106.0005v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

13 pages, 4 Figures, submitted to ApJ Letters

Scientific paper

We measure the intrinsic magnitude dispersion of the Galactic bulge red clump (RC) using two different methods and arrive at an estimate of \sigma_{I} ~ 0.17 mag. We first estimate the width of the RC by analyzing in detail a sample of RC measurements toward double RC sightlines, which are toward regions of the bulge that are geometrically thin. We obtain \sigma_{I} ~ 0.17 mag. We then estimate the value by comparing the luminosity function for bulge RC and red giant (RG) stars in V to that in I for a sightline near the plane, and we obtain a value of \sigma_{I} ~ 0.14-0.17 mag. This result has structural and evolutionary repercussions. It constrains model estimates of the bar's orientation angle derived from RC studies as well as the inferred characteristic length of the bar for a given characteristic height. Moreover, the value is too large to account for using the predicted evolutionary effects of the known metallicity distribution, implying the presence of other population effects.

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