, Volume 38, Issue 3, pp 225–231 | Cite as

Galaxies with f12 > f25

  • R. A. Kandalian


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.


Negative Correlation Control Sample Flux Density Star Formation Active Nucleus 


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Copyright information

© Plenum Publishing Corporation 1996

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  • R. A. Kandalian

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