Mathematics – Logic
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..897j&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 897
Mathematics
Logic
1
Galaxies: Individual (Ugc 12914/12915, Vv254), Interactions, Ism
Scientific paper
We are conducting an infrared wavelength study of the nearby interacting spiral galaxy system, UGC 12914/12915 (VV 254), using ground-based near infrared and mid-infrared imaging and spectral observations using ISOCAM and PHT-S on the Infrared Space Observatory (ISO). VV 254 is one of the closest examples of a rarely occurring sub-class of interacting systems consisting of two counter-rotating spirals having suffered a nearly face-on collision only ~107 years past. Our ISOCAM imaging data spatially resolves the system, revealing two morphologically disturbed spiral galaxies, large scale dynamical ring and a connecting intergalactic bridge. The total mid-IR emission is dominated by the nucleus of the more compact companion, UGC 12915 (northern galaxy), having nearly double the mid-infrared photons as compared to the ringed UGC 12914 (southern galaxy). The total mid-infrared flux density is ~1.3 Jy, or about 5% of the total far-infrared flux density (IRAS bands). The near-/mid-infrared in conjunction with radio continuum data indicate that UGC 12915 is now undergoing vigorous star formation in or near its nucleus while UGC 12914 is more quiescent (possibly in a pre-starburst phase), and thus the off-center collision has influenced the ISM evolution unequally in the two galaxies. A large-scale ring, resonantly induced by the nearly face-on collision, is identified in LW2 (6 μm) and LW8 (11 μm) bands. Finally, the connecting bridge between the two spirals does contain dust in correct proportion to the observed atomic gas column density assuming the radiation field transiently heating the small dust grains is similar in intensity to what is observed in the solar neighborhood and high galactic latitude cirrus clouds. The detailed nature of colder dust (T<100 K) is still uncertain owing to lack of resolution in the far-infrared.
Condon James J.
Helou George
Jarrett Thomas H.
Valjavec E.
van Buren Dale
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