The spatially-resolved gas and dust connection in neutral inflows and outflows in nearby AGN. (arXiv:2103.08502v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Rupke_D/0/1/0/all/0/1">David S. N. Rupke</a> (1 and 2), <a href="http://arxiv.org/find/astro-ph/1/au:+Thomas_A/0/1/0/all/0/1">Adam D. Thomas</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Dopita_M/0/1/0/all/0/1">Michael A. Dopita</a> (2) ((1) Rhodes College, (2) Australian National University)

Dusty, neutral outflows and inflows are a common feature of nearby
star-forming galaxies. We characterize these flows in eight galaxies — mostly
AGN — selected for their widespread NaI D signatures from the Siding Spring
Southern Seyfert Spectroscopic Snapshot Survey (S7). This survey employs deep,
wide field-of-view integral field spectroscopy at moderate spectral resolution
(R=7000 at NaI D). We significantly expand the sample of sightlines in external
galaxies in which the spatially-resolved relationship has been studied between
cool, neutral gas properties — N(NaI), Weq(NaI D) — and dust — E(B-V) from
both stars and gas. Our sample shows strong, significant correlations of total
Weq with E(B-V)_stars and g-i colour within individual galaxies; correlations
with E(B-V)_gas are present but weaker. Regressions yield slope variations from
galaxy to galaxy and intrinsic scatter ~1 Angstrom. The sample occupies regions
in the space of N(NaI) and Weq^abs vs. E(B-V)_gas that are consistent with
extrapolations from other studies to higher colour excess [E(B-V)_gas ~ 1]. For
perhaps the first time in external galaxies, we detect inverse P Cygni profiles
in the NaI D line, presumably due to inflowing gas. Via Doppler shifted NaI D
absorption and emission lines, we find ubiquitous flows that differ from
stellar rotation by >100 km/s or have |v,abs – v,em| > 100 km/s. Inflows and
outflows extend toward the edge of the detected stellar disk/FOV, together
subtend 10-40% of the projected disk, and have similar mean N(NaI) and Weq(NaI
D). Outflows are consistent with minor-axis or jet-driven flows, while inflows
tend toward the projected major axis. The inflows may result from
non-axisymmetric potentials, tidal motions, or halo infall.

Dusty, neutral outflows and inflows are a common feature of nearby
star-forming galaxies. We characterize these flows in eight galaxies — mostly
AGN — selected for their widespread NaI D signatures from the Siding Spring
Southern Seyfert Spectroscopic Snapshot Survey (S7). This survey employs deep,
wide field-of-view integral field spectroscopy at moderate spectral resolution
(R=7000 at NaI D). We significantly expand the sample of sightlines in external
galaxies in which the spatially-resolved relationship has been studied between
cool, neutral gas properties — N(NaI), Weq(NaI D) — and dust — E(B-V) from
both stars and gas. Our sample shows strong, significant correlations of total
Weq with E(B-V)_stars and g-i colour within individual galaxies; correlations
with E(B-V)_gas are present but weaker. Regressions yield slope variations from
galaxy to galaxy and intrinsic scatter ~1 Angstrom. The sample occupies regions
in the space of N(NaI) and Weq^abs vs. E(B-V)_gas that are consistent with
extrapolations from other studies to higher colour excess [E(B-V)_gas ~ 1]. For
perhaps the first time in external galaxies, we detect inverse P Cygni profiles
in the NaI D line, presumably due to inflowing gas. Via Doppler shifted NaI D
absorption and emission lines, we find ubiquitous flows that differ from
stellar rotation by >100 km/s or have |v,abs – v,em| > 100 km/s. Inflows and
outflows extend toward the edge of the detected stellar disk/FOV, together
subtend 10-40% of the projected disk, and have similar mean N(NaI) and Weq(NaI
D). Outflows are consistent with minor-axis or jet-driven flows, while inflows
tend toward the projected major axis. The inflows may result from
non-axisymmetric potentials, tidal motions, or halo infall.

http://arxiv.org/icons/sfx.gif