Unveiling the Boxy Bulge and Bar of the Andromeda Spiral Galaxy

@article{Beaton2005UnveilingTB,
  title={Unveiling the Boxy Bulge and Bar of the Andromeda Spiral Galaxy},
  author={Rachael L. Beaton and Steven R. Majewski and Puragra Guhathakurta and Michael F. Skrutskie and Roc M. Cutri and John Good and Richard J. Patterson and E. Athanassoula and Martin Bureau},
  journal={The Astrophysical Journal Letters},
  year={2005},
  volume={658},
  pages={L91 - L94}
}
A new, 2.8 deg2 J, H, Ks near-infrared (NIR) survey from the 2MASS 6X program across the extent of the optical disk of the Andromeda (M31) galaxy provides a clear view of the M31 center almost completely unfettered by dust extinction and reveals a high-contrast bulge with very boxy isophotes dominating the NIR light to a semimajor axis of ~700'' (2.6 kpc). The inner bulge (≲50'') isophotes are relatively circular but show some twisting. Beyond this, (1) the M31 bulge ellipticity increases, (2… 

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