Mathematics – Logic
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.6503r&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #65.03; Bulletin of the American Astronomical Society, Vol. 24, p.1221
Mathematics
Logic
Scientific paper
The basic morphological structure of M33 remains uncertain, even though it is the closest relatively face-on spiral galaxy. Recently, blue photographic data has been used to argue that M33, traditionally classified as an Scd galaxy, has a central bar. However, blue light is particularly sensitive to variations in extinction or star formation activity. The near-infrared provides a superior tracer of the underlying stellar mass distribution, as demonstrated by the detection of oval distortions even in galaxies previously thought to be unbarred. The location, and even the number, of spiral arms in M33, are uncertain. In the past, blue Schmidt plates have been used to identify spiral arms. The use of blue plates is particularly misleading in M33 due to the large amount of massive star formation seen outside of the spiral arms. We have used the new SQIID detector on the 1.3 meter telescope at Kitt Peak to perform J,H and K band photometry on the inner 15' times 30' region of M33. We present composite mosaics which are used to map the spiral arms and to determine if there is a non-axisymmetric potential in M33.
Regan Michael W.
Vogel Stuart
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