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V. Gorjian, M.W. Werner (JPL), T.H. Jarrett (IPAC), D.M. Cole, M.E. Ressler (JPL)
We present new small-aperture photometry and high resolution images at 10\mum (N band) for 87 Seyfert (Sy) galaxies from the Extended 12\mum Sample drawn from the IRAS database. With this data we hope to test the predictions of the unified model and to search for bright, extended circumnuclear 10\mum emission.
We detected 62 Sy's, 18 of which have no previously published small aperture photometry. The 31 Sy 1's and 31 Sy 2's that were detected have a similar luminosity distribution. Except for previously known bright extended 10\mum structure around Arp 220, NGC 1068 and NGC 7469, we see definitive evidence for bright extended emission around only one new object: Mrk 1239. Four other Sy 1's and 6 other Sy 2's show evidence of faint, low level extended emission. All other detections are consistent with being point sources to within 1\arcsec. Two Sy 1's and two Sy 2's show evidence of significantly increased flux over previously published small aperture values or IRAS values.
We have done color comparisons between the N band data and the similarly dust penetrating J and Ks band data from the Two Micron All Sky Survey (2MASS). There is a distinct trend of redder J-Ks color corresponding to brighter absolute N band magnitudes. In J-Ks vs Ks-N color space there is a definite grouping of Sy 1's and Sy 2's with two sets of outliers. One set of outliers seem to correspond to greater reddening of the main group's colors. The reason for the other outliers is not clear; they may be due to very heavy absorption.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.