Next Contents Previous

Zw049.057

Zw049.057 appears as a highly inclined disk with a smooth light distribution at large radii but a bright arm of star formation ~ 1" south of the 2.2 µm peak. The reddening and the extinction-corrected 2.2 µm emission also peak ~ 0.5" south of the 2.2 µm emission peak. Zw049.057 exhibits a linear `shadow' feature extending radially from the nucleus along the minor axis at PA appeq -50°. The feature is perhaps due to an absorbing cloud in the nucleus blocking radiation along the shadow line on the minor axis. This interpretation would imply that much of the light seen along the minor axis of the galaxy is scattered light from the nucleus. Alternatively, if this is a dust absorption lane, it must extend linearly over 500 pc in radius and a high mass is required in order to produce the absorption over the extent of the lane.

Zw049.057

Shaded contour plots of the extinction corrected 2.2 µm emission are shown together with the 1.1 µm (upper left) observed emission. In both panels, the contours and shading are logarithmic with the contours spaced by factors 21/2. (The level values are the same as for the figure above). The arcsec displacements in RA and DEC, given along the borders are measured from the 2.2 µm in all frames. At the upper left, a length bar is drawn. For the ratio image, both the 2.2 and 1.1 µm images were smoothed with the same adaptive smoothing and then smoothed with a Gaussian FWHM = 0.2" in calculating the 2.2 µm opacity from Eq. 3 (see text). In cases where a strong point-source or variable background contaminated the 2.2 µm image, the extinction corrected image was derived for 1.6 µm. For the galaxies with strong point-sources, the PSF was fit to the source and then subtracted and replaced by a Gaussian with the proper integrated flux (see text - NGC 7469, IRAS 08572+3915, IRAS 05189-2524, PKS 1345+12, IRAS 07598+6508, Mrk 1014 and 3C48).

Zw049.057

Next Contents Previous