Galaxies with Biconical Ionized Structure in MaNGA - I. Sample Selection and Driven Mechanisms
arxiv(2024)
摘要
Based on the integral field unit (IFU) data from Mapping Nearby Galaxies at
Apache Point Observatory (MaNGA) survey, we develop a new method to select
galaxies with biconical ionized structures, building a sample of 142 edge-on
biconical ionized galaxies. We classify these 142 galaxies into 81 star-forming
galaxies, 31 composite galaxies, and 30 AGNs (consisting of 23 Seyferts and 7
LI(N)ERs) according to the -BPT diagram. The star-forming bicones have
bar-like structures while AGN bicones display hourglass structures, and
composite bicones exhibit transitional morphologies between them due to both
black hole and star-formation activities. Star-forming bicones have intense
star-formation activities in their central regions, and the primary driver of
biconical structures is the central star formation rate surface density. The
lack of difference in the strength of central black hole activities (traced by
dust attenuation corrected λ5007 luminosity and Eddington ratio)
between Seyfert bicones and their control samples can be naturally explained as
that the accretion disk and the galactic disk are not necessarily coplanar.
Additionally, the biconical galaxies with central LI(N)ER-like line ratios are
edge-on disk galaxies that show strong central dust attenuation. The radial
gradients of surface brightness follow the r^-2.35 relation, roughly
consistent with r^-2 profile, which is expected in the case of
photoionization by a central point-like source. These observations indicate
obscured AGNs or AGN echoes as the primary drivers of biconical structures in
LI(N)ERs.
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