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={Andrea M. Ghez and Gaspard Duch{\^e}ne and Keith Y. Matthews and Seth D. Hornstein and Angelle Tanner and James E. Larkin and Mark R. Morris and Eric Edward Becklin and Samir Salim and Ted Kremenek and D. J. Thompson and Baruch T. Soifer and Gerry X. Neugebauer and Ian S. McLean},
  journal={The Astrophysical Journal},
  year={2003},
  volume={586}
}
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… Expand

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References

SHOWING 1-10 OF 33 REFERENCES
High Proper-Motion Stars in the Vicinity of Sagittarius A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy
Over a 2 year period we have conducted a di†raction-limited imaging study at 2.2 km of the inner 6A ) 6A of the central stellar cluster of the Galaxy using the W. M. Keck 10 m telescope. The K-bandExpand
A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way
TLDR
Ten years of high-resolution astrometric imaging allow us to trace two-thirds of the orbit of the star currently closest to the compact radio source (and massive black-hole candidate) Sagittarius A* and show that the star is on a bound, highly elliptical keplerian orbit around Sgr A*. Expand
The accelerations of stars orbiting the Milky Way's central black hole
TLDR
Measurements of the accelerations of three stars from the central radio source Sagittarius A* increase the inferred minimum mass density in the central region of the Galaxy by an order of magnitude relative to previous results, and localize the dark mass to within 0.05 ± 0.04 arcsec of the nominal position of Sgr A*. Expand
The Distribution of Stars near the Supermassive Black Hole in the Galactic Center
We analyze three sets of infrared star counts in the inner ~0.5 pc of the Galactic center. We perform statistical tests on the star counts and model in detail the extinction field and the effects ofExpand
On the size of the galactic centre compact radio source: diameter <20 AU
The existence of a compact nonthermal radio source at the galactic centre was first suggested by Lynden-Bell and Rees1 as the possible signature of a black hole. Such a source was detectedExpand
Adaptive Optics Near-Infrared Spectroscopy of the Sagittarius A* Cluster
We present K-band λ/Δλ ~ 2600 spectroscopy of five stars (K ~ 14-16 mag) within 05 of Sgr A*, the radio source associated with the compact massive object suspected to be a 2.6 × 106 M☉ black hole atExpand
The case against a massive black hole at the Galactic Centre
MANY of the compact near-infrared sources observed in the central parsec of our Galaxy have been shown to be very massive, luminous blue stars with strong helium lines and fast winds, perhaps similarExpand
The galactic center black hole: Clues for the evolution of black holes in Galactic nuclei
The evidence for a black hole located at the dynamical center of the Milky Way and identified with the unusual radio source, Sgr A∗, is now very compelling. Proper motion and radial velocity surveysExpand
The Proper Motion of Sagittarius A*. I. First VLBA Results
We observed Sgr A* and two extragalactic radio sources nearby in angle with the VLBA over a period of 2 yr and measured relative positions with an accuracy approaching 0.1 mas. The apparent properExpand
Sagittarius A* “Visual Binaries”: A Direct Measurement of the Galactocentric Distance
We present a new geometrical method for measuring the distance to the Galactic center (R0) by solving for the Keplerian orbit of individual stars bound to the black hole associated with Sgr A* fromExpand
...
1
2
3
4
...