First VLTI infrared spectro-interferometry on GCIRS 7 ⋆ Characterizing the prime reference source for Galactic center observations at highest angular resolution

@article{Pott2008FirstVI,
  title={First VLTI infrared spectro-interferometry on GCIRS 7 ⋆ Characterizing the prime reference source for Galactic center observations at highest angular resolution},
  author={Jorg-Uwe Pott and Andreas Eckart and Andreas Glindemann and Stefan Kraus and Rainer Schodel and Andrea M. Ghez and Julien Woillez and Gerd Weigelt},
  journal={Astronomy and Astrophysics},
  year={2008},
  volume={487},
  pages={413-418}
}
Context. The massive black hole Sgr A* at the very center of the Galaxy, and its immediate stellar and non-stellar environment, have been studied in the past decade with increasing intensity and wavelength coverage, revealing surprising results. This research requires the highest angular resolution available to avoid source confusion and to study the physical properties of the objects. Aims. GCIRS 7 is the dominating star of the central cluster in the NIR, so it has been used as wavefront and… 

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References

SHOWING 1-10 OF 32 REFERENCES

The enigma of GCIRS 3 - Constraining the properties of the mid-infrared reference star of the central parsec of the Milky Way with optical long baseline interferometry

GCIRS3 is the most prominent MIR source in the central pc of the Galaxy. NIR spectroscopy failed to solve the enigma of its nature. The properties of extreme individual objects of the central stellar

AMBER, the near-infrared spectro-interferometric three-telescope VLTI instrument

Context: Optical long-baseline interferometry is moving a crucial step forward with the advent of general-user scientific instruments that equip large aperture and hectometric baseline facilities,

The possibility of detecting Sagittarius A* at 8.6$\,\mu$m from sensitive imaging of the Galactic center

Context. Sagittarius A* (Sgr A*) at the center of the Milky Way is a black hole accreting at extremely sub-Eddington rates. Measurements of its emission in the infrared and X-ray domains are

SINFONI in the Galactic Center: Young Stars and Infrared Flares in the Central Light-Month

We report on 75 mas resolution, near-IR imaging spectroscopy within the central 30 lt-days of the Galactic center, taken with the new adaptive optics-assisted integral-field spectrometer SINFONI on

WFCAM, Spitzer/IRAC and SCUBA observations of the massive star-forming region DR21/W75 - I. The collimated molecular jets

We present wide-field near-infrared (IR) images of the DR21/W75 high-mass star-forming region, obtained with the Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope. Broad-band JHK and

Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre

High-resolution infrared observations of Sagittarius A* reveal ‘quiescent’ emission and several flares, and traces very energetic electrons or moderately hot gas within the innermost accretion region.

Really Cool Stars and the Star Formation History at the Galactic Center

We present λ/Δλ = 550-1200 near-infrared H and K spectra for a magnitude-limited sample of 79 asymptotic giant branch and cool supergiant stars in the central ≈5 pc (diameter) of the Galaxy. We use a

A windswept cometary tail on the Galactic center supergiant IRS 7

High-resolution VLA observations provide evidence of optically thick radio emission from IRS 7, a cool red supergiant star, located at a projected distance of roughly 1 1t-yr from the Galactic

Variable and Embedded Stars in the Galactic Center

We report results of a time series analysis of high-resolution K-band imaging, photometry, and polarimetry of stars in the Galactic center cluster covering 7 consecutive years. In our statistical

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

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