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The Andromeda Optical and Infrared Disk Survey | | Jonathan Sick
; Stéphane Courteau
; Jean-Charles Cuillandre
; | | Date: |
17 Oct 2013 | | Abstract: | The Andromeda Optical and Infrared Disk Survey has mapped M31 in $u^*
g^prime r^prime i^prime J K_s$ wavelengths out to R=40 kpc using the MegaCam
and WIRCam wide-field cameras on the Canada-France-Hawaii Telescope. Our survey
is uniquely designed to simultaneously resolve stars while also carefully
reproducing the surface brightness of M31, allowing us to study M31’s global
structure in the context of both resolved stellar populations and spectral
energy distributions. We use the Elixir-LSB method to calibrate the optical
$u^* g^prime r^prime i^prime$ images by building real-time maps of the sky
background with sky-target nodding. These maps are stable to $mu_g lesssim
28.5$ mag arcsec$^{-2}$ and reveal warps in the outer M31 disk in surface
brightness. The equivalent WIRCam mapping in the near-infrared uses a
combination of sky-target nodding and image-to-image sky offset optimization to
produce stable surface brightnesses. This study enables a detailed analysis of
the systematics of spectral energy distribution fitting with near-infrared
bands where asymptotic giant branch stars impose a significant, but
ill-constrained, contribution to the near-infrared light of a galaxy. Here we
present panchromatic surface brightness maps and initial results from our
near-infrared resolved stellar catalog. | | Source: | arXiv, 1310.4832 | | Services: | Forum | Review | PDF | Favorites | |
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