Raj Kumar Pradhan (Central Department of Physics, Tribhuvan University)
Classical Cepheids are excellent tracers to estimate the rotation velocity of the galaxies because they provide better distance accuracy with less uncertainty. With stringent radial velocity from the recent Gaia DR3 and proper motion, we estimate the rotation velocity of the Milky Way galaxy for 909 Classical Cepheids. We have used a more accurate distance estimated based on the period-luminosity from a mid-infrared survey. Up to 20 kpc, we find the best-fit rotation velocity of 240.15 ± 1.95 km/s (R − R_0) and a concentration parameter of 17.66 ± 0.09. Also, we obtain the virial mass of (5.73 ± 0.04 × 10^11)M_0.
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Raj Kumar Pradhan (Central Department of Physics, Tribhuvan University) Mr Madhu Sudan Paudel (Tribhuvan University) Mr Prajwal Poudyal (Tri-Chandra Multiple Campus, Tribhuvan University) Mr Anjan Sigdel (Tri-Chandra Multiple Campus, Tribhuvan University)