134 research outputs found
Census of Gaseous Satellites around Local Spiral Galaxies
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 () and 46 candidates within . Our
sensitivity using ALFALFA data converts to 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 gaseous satellites per host galaxy within
and within , 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 , 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.Comment: 18 pages, 13 figures, accepted by MNRA
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