期刊
ASTRONOMY & ASTROPHYSICS
卷 591, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201528037
关键词
quasars: emission lines; galaxies: high-redshift; galaxies: active; galaxies: evolution
资金
- INAF
- Italian Ministry of University and Research
- FP7 Career Integration Grant eEASy [CIG 321913]
- European Research Council under the European Union (FP)/ERC Grant [306476]
- Swiss National Science Foundation (ETH Zurich) [PP00P2_138979/1]
- Grants-in-Aid for Scientific Research [16H03958] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/M001172/1, ST/K003119/1, 1160845] Funding Source: researchfish
- European Research Council (ERC) [306476] Funding Source: European Research Council (ERC)
- STFC [ST/K003119/1, ST/M001172/1] Funding Source: UKRI
Negative feedback from active galactic nuclei (AGN) is considered a key mechanism in shaping galaxy evolution. Fast, extended outflows are frequently detected in the AGN host galaxies at all redshifts and luminosities, both in ionised and molecular gas. However, these outflows are only potentially able to quench star formation, and we are still lacking decisive evidence of negative feedback in action. Here we present observations obtained with the Spectrograph for INtegral Field Observations in the Near Infrared (SINFONI) H- and K-band integral-field of two quasars at z similar to 2.4 that are characterised by fast, extended outflows detected through the [OIII]lambda 5007 line. The high signal-to-noise ratio of our observations allows us to identify faint narrow (FWHM < 500 km s(-1)) and spatially extended components in [OIII]lambda 5007 and H alpha emission associated with star formation in the host galaxy. This star formation powered emission is spatially anti-correlated with the fast outflows. The ionised outflows therefore appear to be able to suppress star formation in the region where the outflow is expanding. However, the detection of narrow spatially extended H alpha emission indicates star formation rates of at least similar to 50-90 M-circle dot yr(-1), suggesting either that AGN feedback does not affect the whole galaxy or that many feedback episodes are required before star formation is completely quenched. On the other hand, the narrow H alpha emission extending along the edges of the outflow cone may also lead also to a positive feedback interpretation. Our results highlight the possible double role of galaxy-wide outflows in host galaxy evolution.
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