2010A&A...515A..49R -
Astronomy and Astrophysics, volume 515, A49-49 (2010/6-1)
Interstellar extinction and the distribution of stellar populations in the direction of the ultra-deep Chandra galactic field.
REVNIVTSEV M., VAN DEN BERG M., BURENIN R., GRINDLAY J.E., KARASEV D. and FORMAN W.
Abstract (from CDS):
We studied the stellar population in the central 6.6'x6.6'region of the ultra-deep (1Msec) Chandra Galactic field - the ``Chandra bulge field'' (CBF) approximately 1.5 degrees away from the Galactic Center - using the Hubble Space Telescope ACS/WFC blue (F435W) and red (F625W) images. We mainly focus on the behavior of red clump giants - a distinct stellar population, which is known to have an essentially constant intrinsic luminosity and color. By studying the variation in the position of the red clump giants on a spatially resolved color-magnitude diagram, we confirm the anomalous total-to-selective extinction ratio, as reported in previous work for other Galactic bulge fields. We show that the interstellar extinction in this area is <AF625W≥4 on average, but varies significantly between ∼3-5 on angular scales as small as 1 arcminute. Using the distribution of red clump giants in an extinction-corrected color-magnitude diagram, we constrain the shape of a stellar-mass distribution model in the direction of this ultra-deep Chandra field, which will be used in a future analysis of the population of X-ray sources. We also show that the adopted model for the stellar density distribution predicts an infrared surface brightness in the direction of the ``Chandra bulge field'' in good agreement (i.e. within ∼15%) with the actual measurements derived from the Spitzer/IRAC observations.
Abstract Copyright:
∼
Journal keyword(s):
stars: general - Hertzsrung-Russell (HR) and C-M diagrams - stars: luminosity fonction, mass function - Galaxy: bulge - galaxies: stellar content - X-rays: galaxies
Simbad objects:
6
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2010A&A...515A..49R and select 'bookmark this link' or equivalent in the popup menu