Multiphase gas kinematics as a tracer of AGN-driven outflows (and inflows) across different wavelengths
Marina Bianchin
University of California, Irvine, US
Active supermassive black holes can influence the fate of their host galaxies. Gas outflows, frequently triggered by the radiation pressure from the accretion disk, can disturb the kinematics of the gas at different scales, from a few tens to tens of thousands of parsecs. In recent years, AGN-driven outflows have been studied across different wavelength domains. From the optical to the mid-infrared, integral field spectroscopy observations have provided insights into the extent and kinematics of the multiphase outflowing gas, including the classical optical hydrogen recombination and atomic transitions, warm (~700 K) and hot (~2000 K) molecular hydrogen, and high ionization coronal lines. Optically selected QSOs (at z<0.2 and Lbol>1045erg/s) show kinematics of the [OIII]5007A line consistent with the presence of gas outflows at distances up to tens of kiloparsecs. The kinetic power of such outflows decreases to the outer parts of the galaxies, indicating deaccelerating motions. In a sample of hard X-ray-selected nearby Seyfert galaxies, gas motions consistent with outflow, are observed in 55% and 79% of the sample when analyzing the hot molecular and ionized gas species, respectively. However, the observations cover only the central kiloparsec of these objects. At similar scales, the JWST MIRI observation of nearby galaxies is becoming a key tool to disentangle the kinematics of active galaxies. In NGC 7469, an outflow traced by coronal gas has been identified with a mass loss rate up to 100 times larger than the accretion rate. The interaction of the high ionization and high-velocity gas with the ISM creates shocks observed in the hot molecular gas. New results with NIRSpec suggest a gas inflow observed in one of the brightest Near-IR hydrogen recombination lines. This possible feeding mechanism is a missing piece in the connection between the starforming ring and the Sy1 nucleus in NGC 7469. In summary, AGN-driven outflows are ubiquitous among active galaxies and are intrinsically multiphase, multiscale phenomena requiring multi-wavelength and spatially resolved observations to fully characterize them.
Possuo graduação. mestrado e doutorado pela universidade federal de Santa Maria. Durante o doutorado utilizei dados de espectroscopia de campo integral no infravermelho próximo para analisar a cinemática do gás na região central de galáxias ativas como parte do projeto AGNIFS liderado pela Prof. Thaisa Storchi-Bergmann. Atualmente sou pesquisadora de pós-doutorado na Universidade da Califórnia, Irvine, onde estudo galáxias ultra-luminosas no infravermelho com dados do JWST e parte da colaboração GOALS (Great Observatories All-sky LIRG Survey). Além da pesquisa em Astronomia, estive envolvida em algumas iniciativas de divulgação científica como fada madrinha no Astrominas, e voluntária no minicurso de Astronomia realizado pelo PET Física da UFSM.
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