Signatures of inflowing gas in red geyser galaxies hosting radio-AGN

Abstract

We study cool neutral gas traced by NaD absorption in 140 local ($\mathrm{z}<0.1)$ early-type ``red geyser'' galaxies. These galaxies show unique signatures in spatially-resolved strong-line emission maps that have been interpreted as large-scale active galactic nuclei driven ionized winds. To investigate the possible fuel source for these winds, we examine the abundance and kinematics of cool gas ($\mathrm{T}\sim 100-1000K$) inferred from Na I D absorption in red geysers and matched control samples drawn from SDSS-IV MaNGA. We find that red geysers host greater amounts of NaD-associated material. Substantial cool gas components are detected in more than $50\%$ of red geysers (compared to 25\% of the control sample) going up to 78$\%$ for radio-detected red geysers. Our key result is that cool gas in red geysers is predominantly infalling. Among our 30 radio-detected red geysers, 86$\%$ show receding NaD absorption velocities (with respect to the systemic velocity) between $40-50\mathrm{km}{\mathrm{s}}^{-1}$. We verify this result by stacking NaD profiles across each sample which confirms the presence of infalling NaD velocities within red geysers ( $\sim 40\mathrm{km}{\mathrm{s}}^{-1}$) with no velocity offsets detected in the control samples. Interpreting our observations as signatures of inflowing cool neutral clouds, we derive an approximate mass inflow rate of ${\dot{\mathrm{M}}}_{\mathrm{in}}\sim 0.1{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$, similar to that expected from minor merging and internal recycling. Some red geysers show much higher rates (${\dot{\mathrm{M}}}_{\mathrm{in}}\sim 5{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$) that may indicate an ongoing accretion event.

16 pages, 14 figures, 2 tables. Accepted for publication in the Astrophysical journal

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