The Star Formation Histories of the Bulge and Disk of M31 from Gemini North+NIRI/Altair and HST/NICMOS

Abstract

We discuss H and K observations of three fields in the bulge and disk of M31 obtained with the Altair adaptive optics system and NIRI instrument on Gemini North. These are the highest resolution and deepest near-infrared observations obtained to date of the inner regions of M31, and demonstrate the promise of ground-based adaptive optics for studying the crowded regions of nearby galaxies. We have combined our observations with previously published HST/NICMOS observations of nine M31 fields and have derived the coarse star formation histories of M31's bulge and inner disk. From fits to the M_K luminosity functions, we find the stellar population mix to be dominated by old, nearly solar-metallicity stars. The old populations, which we define as having age >~6 Gyr, indeed dominate the star formation histories at all radii independent of the relative contributions of bulge and disk stars. Although all of our fields contain some bulge contribution, our results suggest that there is no age difference between the bulge and disk to the limit of our precision.

arXiv comment65 total pages, 22 figures, accepted for publication in the Astronomical Journal

References in corpus (41)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
• Numerical Methods of Star Formation History Measurement and Applications to Seven Dwarf Spheroidals
• Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry
• Simulations of Galaxy Formation in a Lambda CDM Universe I: Dynamical and Photometric Properties of a Simulated Disk Galaxy
• The Magellanic Clouds Photometric Survey: The Large Magellanic Cloud Stellar Catalog and Extinction Map
• Evidence for Stellar Substructure in the Halo and Outer Disk of M31
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The Gemini Deep Deep Survey: III. The abundance of massive galaxies 3-6 billion years after the Big Bang
• Distance to M31 With the HST and Hipparcos Red Clump Stars
• JHK Standard Stars for Large Telescopes: the UKIRT Fundamental and Extended Lists
• Disk Galaxy Formation in a LambdaCDM Universe
• Northern JHK Standard Stars for Array Detectors
• A Method for Determining the Star Formation History of a Mixed Stellar Population
• A new IR-Array photometric survey of Galactic Globular Clusters: A detailed study of the RGB sequence as a step towards the global testing of stellar models
• Evidence for a Significant Intermediate-Age Population in the M31 Halo from Main Sequence Photometry
• Really Cool Stars and the Star Formation History at the Galactic Center
• AGB stars in the Magellanic Clouds. II. The rate of star formation across the LMC
• The Red Giant Branch in the Near-Infrared Colour-Magnitude Diagrams. I: The calibration of photometric indices
• Star Formation Histories from HST Color-Magnitude Diagrams of Six Fields of the LMC
• Parameter Estimation in Astronomy with Poisson-Distributed Data. I. The Chi-Square-Gamma Statistic
• Chemical Abundances of Planetary Nebulae in the Bulge and Disk of M31
• Deriving star formation histories: Inverting HR diagrams through a variational calculus maximum likelihood method
• The red tail of carbon stars in the LMC: Models meet 2MASS and DENIS observations
• The DIRECT Project: Influence of Blending on the Cepheid Distance Scale. I. Cepheids in M31
• Analysis of Four A-F Supergiants in M31 from Keck HIRES Spectroscopy
• The Stellar Populations of Pixels and Frames
• Photometry and the Metallicity Distribution of the Outer Halo of M31. II. The 30 Kpc Field
• The Metallicity Distribution Function of Field Stars in M31's Bulge
• Constraints on Galaxy Formation from Stars in the Far Outer Disk of M31
• The Stellar Content of M31's Bulge
• Clues about the Star Formation History of the M31 Disk from WFPC2 Photometry
• ESO-VLT and Spitzer spectroscopy of IRAS05328-6827: a massive young stellar object in the Large Magellanic Cloud
• Stellar Crowding and the Science Case for Extremely Large Telescopes
• The Brightest AGB Stars in the Inner Bulge of M31
• Planetary nebulae in M32 and the bulge of M31: Line intensities and oxygen abundances
• High Resolution IRAS Maps and IR Emission of M31 --- I. Morphology and Sources
• A cosmological study of the star formation history in the solar neighbourhood
• Deep Photometry in a Remote M31 Major Axis Field Near G1
• No Increase of the Red-Giant-Branch Tip Luminosity Toward the Center of M31
• Deep ALTAIR + NIRI Imaging of the Disk and Bulge of M31

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