Tracing the Local Volume galaxy halo-to-stellar mass ratio with satellite kinematics

Abstract

Rapid advance has been made recently in accurate distance measurements for nearby ($D<11$ Mpc) galaxies based on the magnitude of the tip of red giant branch stars resolved with the Hubble Space Telescope. We use observational properties of galaxies presented in the last version of Updated Nearby Galaxy Catalog to derive a halo mass of luminous galaxies via orbital motion of their companions. Our sample contains 298 assumed satellites with known radial velocities around 25 Milky Way-like massive galaxies and 65 assumed satellites around 47 fainter dominant galaxies. The average total mass-to-$K$-band luminosity ratio is $31\pm 6M_{\odot }/L_{\odot }$ for the luminous galaxies, increasing up to $\sim 200M_{\odot }/L_{\odot }$ toward dwarfs. The bulge-dominated luminous galaxies are characterized with $⟨M_T/L_K⟩=73\pm 15M_{\odot }/L_{\odot }$, while the disc-dominated spirals have $⟨M_T/L_K⟩=17.4\pm 2.8M_{\odot }/L_{\odot }$. We draw attention to a particular subsample of luminous spiral galaxies with signs of declining rotation curve, which have a radial velocity dispersion of satellites less than 55 km/s and a poor dark matter halo with $⟨M_T/L_K⟩=5.5\pm 1.1M_{\odot }/L_{\odot }$. We note that a fraction of quenched (dSph, dE) companions around Milky Way-like galaxies decreases with their linear projected separation as $0.75\exp (-R_p/350\mathrm{kpc})$.

arXiv comment20 pages, 8 figures, 7 tables. Accepted for publication in Astronomische Nachrichten

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