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The BATC Multicolor Photometric Study of M31 Globular Clusters

The BATC Multicolor Photometric Study of M31 Globular Clusters. Fan Zhou Profs Jun Ma and Xu Zhou BATC Group,NAOC. Size. FOV. Pixel Scale. BQE(~400nm) ‏. RON. New E2V. 4K × 4K. 90’×90’. 12um/pixel 1.3"/pixel.  92.2%. <4e. Old Thick. 2K × 2K. 58’×58’. 15um/pixel 1.7"/pixel. <5%.

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The BATC Multicolor Photometric Study of M31 Globular Clusters

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  1. The BATC Multicolor Photometric Study of M31 Globular Clusters Fan Zhou Profs Jun Ma and Xu Zhou BATC Group,NAOC

  2. Size FOV Pixel Scale BQE(~400nm)‏ RON New E2V 4K × 4K 90’×90’ 12um/pixel 1.3"/pixel  92.2% <4e Old Thick 2K × 2K 58’×58’ 15um/pixel 1.7"/pixel <5% >12e The BATC Multicolor Photometry System • The Bejing-Arizona-Taiwan-Connecticut (BATC) group was created by Academician Chen J.-S. 15 years ago. • 60/90 cm f/3 Schmidt Telescope at Xionglong.

  3. The BATC intermediate band filters • The BATC multicolor photometric system includes 15 intermediate band filters, covering the total optical wavelength range from ~3000 to ~10000Å. • The filters are designed to avoid the brightest and most variable night sky emission lines.

  4. The BATC multicolor photometry of M31 • The central 1o×1o field in 15 intermediate bands • 1995 Sep.-1999 Dec. • Total EXP:37hr20min

  5. The ages of M31 GCs • Jiang & Ma (2003) use the Battistini et al. (1987) to obtain BATC SEDs of 172 GCs • Using the BC96 SSP model to derive the ages and metallicities • Nearly all the GCs are older than 1 Gyr • Metal-poor ->old • Metal-rich->young

  6. Break the degeneracy! • One big problem in the SSP model: age~metallcity degeneracy! Reddening also affects it! • Idea: use the known metallicty and reddening to derive the age.

  7. Our data for our sample GCs • BATC(13) + Broadband(5) + 2MASS(3) JHKs photometry (Galleti et al. 2004). • Spectroscopic [Fe/H] obtained: Perrett et al. (2002) and Barmby et al. (2000) • The reddening data: Barmby priv. comm.

  8. BC03 SSP model • Age: 0.1Myr ~ 20 Gyr • Wavelength: 91 Å-160 μm • Track: Padova 1994 (Z=0.0001-0.10)‏ • IMF:Salpeter 1955

  9. The SED fitting with BC03 model

  10. The age distribution of our sample GCs in M31

  11. The metallicity ~age relationship in M31 • Old  metal-poor • Young metal-rich

  12. Future Work • 9o×9o field with >1000 GCs and candidates • Green boxes :Observed already • White boxes: to be observed in the future • 15 intermediate-band

  13. Thanks very much!http://batc.bao.ac.cn/~fanzhou

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