Resolved structure in the nuclear region of the ultraluminous infrared galaxy Mrk 273

Details Resolved structure in the nuclear region of the ultraluminous infrared galaxy Mrk 273 Resolved structure in the nuclear region of the ultraluminous infrared galaxy Mrk 273

1997-09-24

arxiv.org/abs/astro-ph/9709234v1

Astronomy and Astrophysics

Astrophysics

8 pages, Latex. 4 postscript files. Better quality version of figure 1 available from ftp://star.herts.ac.uk/pub/Knapen/mrk273

Scientific paper

10.1086/311015

We have studied the core morphology of the ultraluminous infrared galaxy Mrk 273 by combining a high-resolution adaptive optics near-infrared image with an optical image from the Hubble Space Telescope and interferometric radio continuum data, all at spatial resolutions of 150 mas or better. The near-infrared image reveals that the nucleus has two main components, both of which have radio counterparts. The strongest component (N) shows very similar extended structure in the radio and near-infrared. It has a flat radio spectrum and is resolved into a double-lobed structure (Ne; Nw), with a separation of 90\pm5 mas (70 parsec). A similar structure is detected in the near-infrared. We identify this component as the location of the active nucleus. The second component (SW), strong in the near-infrared but relatively weak in the radio, is located $\sim1$ arcsecond to the southwest. We interpret this as an obscured starburst region associated with the merger. The radio continuum images show a third, strong, component (SE) which has previously been interpreted as a second nucleus. However, it shows no associated optical or near-infrared emission, suggesting that it is in fact a background source.

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