Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signatures of inflowing gas in red geyser galaxies hosting radio-AGN   We study cool neutral gas traced by NaD absorption in 140 local ($\rm z<0.1)$
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 ($\rm T \sim 100-1000 K$) 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 $\rm 50 \%$ 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 $\rm 40 -
50~km~s^{-1}$. We verify this result by stacking NaD profiles across each
sample which confirms the presence of infalling NaD velocities within red
geysers ( $\sim\rm 40~km~s^{-1}$) 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 $\rm \dot{M}_{in}
\sim 0.1 M_{\odot} yr^{-1}$, similar to that expected from minor merging and
internal recycling. Some red geysers show much higher rates ($\rm \dot{M}_{in}
\sim 5 M_{\odot} yr^{-1}$) that may indicate an ongoing accretion event.

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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: solv-int
3
The categories of this paper are: physics
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The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg