All Figures

Figure 1: A continuous Morlet wavelet transform of the time series data of the flux density for PKS B0048-097 taken at the UMRAO at 8.0 GHz. The panels show the flux density time series ( top), the real part of the transform ( middle) and the modulus (power) of the transform ( bottom). The real part displays clearly the signature of a quasi-periodic component with a slowly varying 1-2 yr period. Power at this dilation extends across the entire series. The horizontal lines in the middle and bottom panel enclose the 95% significance region of the detected periodicity determined by a cross-wavelet transform analysis (see text). The hatched areas of the transform panels show the cone of influence, where edge effects resulting from the finite length of the time series decrease the wavelet coefficient power by more than a factor e2.

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In the text

	Figure 2: Lomb-Scargle periodogram for three different parts of the time series of UMRAO PKS B0048-097 8 GHz monitoring data. The dotted and dashed vertical lines show the 95% and 99.9% significance lines, respectively, derived from the cross wavelet transform of the full light curve.
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In the text

Figure 3: VLBI results of PKS B0048-097 at 15 GHz. Top Panels: naturally weighted images of PKS B0048-097 in 1995.58 ( left) and in 2002.38 ( right) at  cm obtained from VLBA 2 cm Survey observations. Image parameters are given in Table 1. A jet towards the north is visible in the 2002 image while a slight extention to the west is seen in the earlier 1995 image. Best fitting Gaussian-model-component approximations to the (u,v)-data are indicated as ellipses. Middle and bottom panels: the projected visibility along PA and for both epochs. Clear deviations from a flat point-source visibility indicate an elongation of the source along different position angles.

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In the text