Devasthal Fast Optical Telescope observations of Wolf-Rayet dwarf galaxy Mrk 996

Abstract

The Devasthal Fast Optical Telescope (DFOT) is a 1.3 meter aperture optical telescope, recently installed at Devasthal, Nainital. We present here the first results using an \Ha filter with this telescope on a Wolf-Rayet dwarf galaxy Mrk 996. The instrumental response and the \Ha sensitivity obtained with the telescope are $(3.3\pm 0.3)\times 10^{-15}(erg{s}^{-1}c{m}^{-2})/(counts{s}^{-1})$ and $7.5\times 10^{-17}erg{s}^{-1}c{m}^{-2}arcse{c}^{-2}$ respectively. The \Ha flux and the equivalent width for Mrk~996 are estimated as $(132\pm 37)\times 10^{-14}erg{s}^{-1}c{m}^{-2}$ and $\sim$96 $\mathring{A}$ respectively. The star formation rate is estimated as $0.4\pm 0.1M_{\odot }$yr${}^{-1}$. Mrk~996 deviates from the radio-FIR correlation known for normal star forming galaxies with a deficiency in its radio continuum. The ionized gas as traced by \Ha emission is found in a disk shape which is misaligned with respect to the old stellar disk. This misalignment is indicative of a recent tidal interaction in the galaxy. We believe that galaxy-galaxy tidal interaction is the main cause of the WR phase in Mrk~996.

13 pages, 2 figures Accepted for publication in "Journal of Astrophysics and Astronomy"

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Cited by in corpus (6)

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• HI imaging of dwarf star-forming galaxies: Masses, morphologies and gas deficiencies
• Halpha imaging survey of Wolf-Rayet galaxies: morphologies and star formation rates
• Optical spectroscopy of star-forming regions in dwarf Wolf-Rayet galaxies
• Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA
• Pathway to Devasthal Astronomical Observatory, ARIES