The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy’s Central Black Hole: A Paradox of Youth

@article{Ghez2003TheFM,
  title={The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy’s Central Black Hole: A Paradox of Youth},
  author={A. Ghez and G. Duch{\^e}ne and K. Matthews and S. Hornstein and A. Tanner and J. Larkin and M. Morris and E. Becklin and S. Salim and T. Kremenek and D. Thompson and B. Soifer and G. Neugebauer and I. McLean},
  journal={The Astrophysical Journal},
  year={2003},
  volume={586}
}
  • A. Ghez, G. Duchêne, +11 authors I. McLean
  • Published 2003
  • Physics
  • The Astrophysical Journal
  • We have obtained the first detection of spectral absorption lines in one of the high-velocity stars in the vicinity of the Galaxy's central supermassive black hole. Both Brγ (2.1661 μm) and He I (2.1126 μm) are seen in absorption in S0-2 with equivalent widths (2.8 ± 0.3 and 1.7 ± 0.4 A) and an inferred stellar rotational velocity (220 ± 40 km s^(-1)) that are consistent with that of an O8-B0 dwarf, which suggests that it is a massive (~15 M_☉) young (less than 10 Myr) main-sequence star. This… CONTINUE READING
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