Multicolour surface photometry of galaxies : Mrk 35 and Mrk 799

Abstract

Imaging photometry of two peculiar galaxies Mrk 35 and Mrk 799 has been carried out using a CCD camera and broad band filters. Both the galaxies are highly disturbed and the morphologies of the galaxies are quite complex. The images in different filters show interesting structures which are more clearly visible in the high frequency images obtained by substracting the median filtered image from the original image. In Mrk 35 a stellar nucleus is seen on the western side of the galaxy and an elongated bar is visible to its East. A dust lane appears to be present in the central region. The stellar nucleus is bluer compared to the barred structure. A very interesting feature seen in the colour (B-R) map is a U-shaped structure (elongated ring open on one end) situated slightly west of the central nucleus. In Mrk 799 a bright hotspot is seen on one side of the galaxy which is comparable in luminosity to the nucleus but the colour is much bluer which is indicative of the presence of massive young stars.