Imaging and spectroscopic studies of the interacting system Markarian 171

Details Imaging and spectroscopic studies of the interacting system Markarian 171 Imaging and spectroscopic studies of the interacting system Markarian 171

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1480f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Dec. 1987, p. 1480-1486.

Other

17

Astronomical Spectroscopy, Charge Coupled Devices, Emission Spectra, Gravitational Effects, H Alpha Line, Markarian Galaxies, Hot Stars, Spectral Energy Distribution, Star Distribution, Stellar Color

Scientific paper

V, R, and I broadband CCD images, as well as H-alpha spectroscopic observations of Markarian 171, are presented. Two apparently interacting dust-enshrouded galaxies exhibit relatively normal V-R, V-I galactic stellar-population colors in their outer regions, and spatially extended H-alpha emission. However, the dereddened colors imply a hot stellar population. The dual characteristics of narrow H-alpha lines and spatially extended H-alpha emission clearly distinguish this type of activity from that associated with the compact central regions of active galactic nuclei and QSOs. Apparently, in the case of Mk 171 the interaction has induced star formation throughout a significant fraction of the galaxy (kiloparsecs) - not just in the immediate vicinity of the nucleus (parsecs). A peculiar stellar population of hot stars associated with a knot of weak H-alpha emission appears spatially separate from the other emission-line regions. It is possible that this stellar knot is a severed remnant attributable to the gravitational interaction between the two galaxies.

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