MORPHOLOGICAL DIFFERENCES BETWEEN OPTICAL AND INFRARED IMAGES OF THE SPIRAL GALAXY NGC309

被引:90
作者
BLOCK, DL [1 ]
WAINSCOAT, RJ [1 ]
机构
[1] UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822
关键词
D O I
10.1038/353048a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
THE morphological classification of spiral galaxies into various types is suspected to be highly dependent on the wavelength of observation 1, because optical images emphasize young population I stars at the expense of other stellar types, as well as ionized gas and dust. Extension of the classification of galaxies out to wavelengths of a few micrometres has had to await the development of large-format near-infrared array cameras. We present here images at 2.1-mu-m wavelength of NGC309, one of the largest 'grand design' (type ScI) spiral galaxies, obtained with the 256 x 256 array camera developed for the NICMOS (near-infrared camera and multiobject spectrograph) instrument, designed for installation on the Hubble Space Telescope. Optically, NGC309 presents a classic multi-arm morphology, but at 2.1-mu-m we see a two-arm spiral and the appearance of a prominent central bar; it resembles the SBa galaxy NGC1358. These studies underscore existing indications 2 that the disk structure of spiral galaxies may be unrelated to the Hubble type assigned from the transient population I morphology.
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页码:48 / 50
页数:3
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