Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap.....38..225k&link_type=abstract
Astrophysics, Volume 38, Issue 3, pp.225-231
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
We have compiled a sample of galaxies whose flux density is higher at 12 microns (f12) than at 25 microns (f25). It is argued thatf12 >f25 effectively selects quiescent galaxies which are less active in infrared, radio, and optical bands than other types of normal galaxies. Moreover galaxies withf12 >f25 do not exhibit the well-known relations that normal galaxies show between far-infrared parameters, for example, the negative correlation betweenf12/f25 andf60/f100. These galaxies also show different far-infrared and radio properties. In our opinion this sample of quiescent galaxies is suitable for use as a control sample when properties of more active galaxies are discussed. It may also be used in modeling galaxies with active star formation or an active nucleus.
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