Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..753h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 3/AUG1, P. 753, 1994
Astronomy and Astrophysics
Astronomy
44
Scientific paper
Star counts from the Two-Micron Galactic Survey are used to determine the nature of peaks for 350> 1> 150 in the Galactic plane in the 2- m surface-brightness maps. Low extinction by itself is demonstrated to be insufficient to explain the peaks. The peak at 1=330 is shown to have a different luminosity function from those at 1=210 and 270, the latter being almost certainly caused by very luminous, massive young stars. By far the most likely explanation is that they are associated with a star formation region at the near end of the bar. A simple model which includes the bar is proposed; this accurately predicts the form of the major features in the 2.2- m surface-brightness maps on the Galactic plane for 400> 1> 100 and - 100>1> 400. As a consequence, we find that the most probable position angle for the bar is 750+ 50 that the semimajor axis of the bar is 3.7-4 kpc, that there are few if any luminous stars in the 3-kpc ring, and that the width of the stellar population of the Scutum arm is 300 pc. Key words: stars: formation - Galaxy: stellar content - Galaxy: structure - infrared: stars.
Calbet Xavier
Garzon Francisco
Hammersley Peter L.
Mahoney Terry
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