Census of Gaseous Satellites around Local Spiral Galaxies

Abstract

We present a search for gas-containing dwarf galaxies as satellite systems around nearby spiral galaxies using 21 cm neutral hydrogen (HI) data from the Arecibo Legacy Fast ALFA (ALFALFA) Survey. We have identified 15 spiral `primary' galaxies in a local volume of 10 Mpc with a range of total masses, and have found 19 gas-containing dwarf satellite candidates within the primaries' virial volumes ($R_{200}$) and 46 candidates within $2R_{200}$. Our sensitivity using ALFALFA data converts to $M_{\mathrm{HI}}\approx 7.4\times 10^6$ $M_{\odot }$ at 10 Mpc, which includes 13 of the 26 gaseous dwarf galaxies in the Local Group, and the HI properties of our sample are overall similar to these 13. We found $0-3$ gaseous satellites per host galaxy within $R_{200}$ and $0-5$ within $2R_{200}$, which agrees with the low numbers present for the Milky Way and M31. There is also agreement with the star-forming satellite numbers per host in the deep optical surveys SAGA and ELVES, and the Auriga cosmological simulations. When scaled to $R_{200}$, the optical surveys do not show a trend of increasing quenched fraction with host mass; there is a slight increase in the total number of gaseous satellites with host mass for our sample. The low numbers of gaseous/star-forming satellites around spiral hosts are consistent with the idea that a universal and effective satellite quenching mechanism, such as ram pressure stripping by the host halo, is likely at play.

18 pages, 13 figures, accepted by MNRAS

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