RAVEN AND THE CENTER OF MAFFEI 1: MULTI-OBJECT ADAPTIVE OPTICS OBSERVATIONS OF THE CENTER OF A NEARBY ELLIPTICAL GALAXY AND THE DETECTION OF AN INTERMEDIATE AGE POPULATION Based on data obtained at Subaru Telescope, which is operated by the National Optical Observatory of Japan. † † This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Adm

• Published in: The Astrophysical journal Vol. 811; no. 2
• Main Authors: Davidge, T. J., Andersen, D. R., Lardière, O., Bradley, C., Blain, C., Oya, S., Akiyama, M., Ono, Y. H.
• Format: Journal Article
• Language: English
• Published: The American Astronomical Society 29.09.2015
• Subjects: galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: individual (Maffei 1)
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1088/0004-637X/811/2/133

ABSTRACT Near-infrared (NIR) spectra that have an angular resolution of ∼0.15 arcsec are used to examine the stellar content of the central regions of the nearby elliptical galaxy Maffei 1. The spectra were recorded at the Subaru Telescope, with wavefront distortions corrected by the RAVEN Multi-object Adaptive Optics science demonstrator. The Ballick-Ramsey C2 absorption bandhead near 1.76 m is detected, and models in which ∼10%-20% of the light near 1.8 m originates from stars of spectral type C5 reproduce the depth of this feature. Archival NIR and mid-infrared images are also used to probe the structural and photometric properties of the galaxy. Comparisons with models suggest that an intermediate age population dominates the spectral energy distribution between 1 and 5 m near the galaxy center. This is consistent not only with the presence of C stars, but also with the large Hβ index that has been measured previously for Maffei 1. The J − K color is more or less constant within 15 arcsec of the galaxy center, suggesting that the brightest red stars are well-mixed in this area.