Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jkas...41..121s&link_type=abstract
Journal of the Korean Astronomical Society, vol. 41, no. 5, pp. 121-137
Astronomy and Astrophysics
Astronomy
Clusters: Starburst Galaxy: Dwarf Galaxy: Blue Compact Dwarf Galaxy: Mrk 49
Scientific paper
We present optical and near-infrared imaging and long-slit spectroscopy for the blue compact dwarf galaxy (BCD) Mrk 49 in the Virgo Cluster. The surface brightness distribution analysis shows that Mrk 49 consists of an off-centered blue bright compact core of r = 10 arcsec and a red faint outer exponential envelope. The H_{α} image and color difference suggest that these two components have different stellar populations: a high surface brightness population of massive young stars and an underlying low surface brightness population of older stars. The redder near-infrared colors of the inner most region suggest that the near-infrared flux of Mrk 49 originates from evolved massive stars associated with the current star-forming activity. The total apparent magnitude is B_{T} = 14.32 mag and the mean effective surface brightness is μ_{eff}(B) = 21.56 mag arcsec^{-2}. Long-slit spectroscopy shows that Mrk 49 rotates apparently as a solid body within r = 10 arcsec in a plane at position angle 55 degrees with an amplitude of about 20 km sec^{-1}. The measured radial velocity of Mrk 49 was derived as 1,535 km sec^{-1}; and the total mass of stars and gases is in the range of 3 to 6 ×10^{9} M_{sun}. The mass-to-light ratios for the central region of Mrk 49 in I and B band are estimated 1.0 and 0.5, respectively. The upper limit of the dark matter to visible matter ratio seems to be < 5. The oxygen abundance is 12 + log(O/H) = 8.21 ± 0.1 which is about one quarter of the solar value while the relative helium abundance appears to be similar to that of the sun.
Byun Yong-Ik.
KYEONG Jaemann
Sung Eon-Chang
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