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Galactic Rain: Cool Gas Inflows in Red Geyser Galaxies and Their Connection to Active Galactic Nuclei Activity and Interactions
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DOI：10.3847/1538-4357/ae5f90.png)
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Abstract
En 中文
Red geysers are a population of massive ( logM/M circle dot similar to 10.5 ), quiescent galaxies with large-scale but weak, bisymmetric ionized gas outflows, interpreted as signatures of ongoing, low-level active galactic nucleus (AGN) feedback. We investigate the kinematics and prevalence of cool (T similar to 100-1000 K) neutral gas traced by Na i D absorption, and its connection to galaxy environment and AGN activity. Using 140 red geyser galaxies from the Sloan Digital Sky Survey-IV Mapping Nearby Galaxies at Apache Point Observatory (or MaNGA), we measure spatially resolved velocities and dispersions via double-Gaussian fits to the Na i D doublet. We find that similar to 70% of the cool gas is inflowing, with a median velocity of similar to 47 km s-1 (similar to 10% of the expected freefall velocity), and that it also exhibits kinematically ordered motions with sigma NaD/sigma* similar to 0.4. Additionally, the Na i D absorption is more prevalent in red geysers than in a matched control sample, with a higher detection fraction (63% versus 40%) and reservoir areas similar to 1.6 times larger. Acceleration (similar to 1 Myr) and accretion (similar to 20 Myr) timescales indicate that the Na I D-absorbing clouds are likely young and short-lived. Another intriguing result is that radio-detected red geysers (30% of the sample) show inflowing gas reservoirs similar to 7 times larger than in non-radio systems. Similarly, galaxies subject to environmental effects host inflowing gas reservoirs similar to 2.7 times larger than isolated red geysers. We take this as evidence that galaxy environments play a key role in replenishing the cool gas reservoirs of red geysers, fueling central AGN activity, sustaining radio emission, and regulating long-term quiescence. These findings reveal that quiescent systems are governed by cycles of inflow, feedback, and regulation.
Keywords:
DATA-ANALYSIS PIPELINE
SPECTROSCOPIC DATA
NEARBY GALAXIES
STAR-FORMATION
OUTFLOWS
VELOCITY
SPECTRA
ABSORPTION
SIGNATURES
KINEMATICS
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