Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1676n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 4, p. 1676-1681
Astronomy and Astrophysics
Astronomy
113
Galactic Nuclei, Infrared Imagery, Infrared Spectra, Milky Way Galaxy, Star Clusters, Star Formation, Stellar Luminosity, Emission Spectra, Hydrogen Recombinations, Infrared Spectrometers, Infrared Spectroscopy
Scientific paper
Infrared imaging and spectroscopic studies suggest that regions of recent massive star formation exist in the center region of the Galaxy. Here, we present J(1.29 microns), H(1.67 microns), K(2.23 microns), and L'(3.82 microns) broadband images, as well as Br gamma and Br alpha hydrogen recombination line images of the Object #17 detected in a near-infrared survey at a projected distance of 30 pc from the Galactic center. Our data show that this source is a cluster of luminous stars with emission lines. The line flux and width of these stars are similar to those of Of-type stars, Wolf-Rayet stars, and He I emission-line stars recently discovered in the central parsec of the Galaxy. However, although the He II line at 3.09 microns has been detected in Object #17, the He I line at 2.06 microns seems weak. The weakness contrasts with stars in the central parsec of the Galaxy. The broadband colors are consistant with the idea that the #17 cluster is near tha Galactic center, and this consistancy is further evidence for the recent occurrence of massive star formation near the Galactic center. It is possible that this cluster is responsible for the ionization of the thermal arched filaments observed in the radio.
Kobayashi Naoto
Nagata Tetsuya
Shure Mark
Woodward Charles E.
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