Volume 618, October 2018
|Number of page(s)||10|
|Published online||09 October 2018|
The Close AGN Reference Survey (CARS)
No evidence of galaxy-scale hot outflows in two nearby AGN⋆
Yale Center for Astronomy and Astrophysics, and Physics Department, Yale University, PO Box 2018120 New Haven, CT, 06520-8120 USA
2 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
3 Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA, 02138 USA
4 Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
5 Department of Physics & Astronomy, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
6 Carlson Center for Imaging Science, Rochester Institute of Technology, Rochester, NY, 14623, USA
7 I. Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
8 LERMA, Observatoire de Paris, Collège de France, PSL Univ., CNRS, Sorbonne Univ., 75014 Paris, France
9 Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW, 2006, Australia
10 School of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff, CF24 3AA, UK
11 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
12 School of Physics & Astronomy, Rochester Institute of Technology, Rochester, NY, 14623, USA
13 Instituto de Astrofísica de Andalucía, Glorieta de la Astronomía s/n, 18008 Granada, Spain
14 Departamento de Física Teórica, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain
15 Gemini Observatory, Northern Operations Center, 670 N. A’ohoku Pl., Hilo, Hawaii, 96720, USA
Accepted: 30 June 2018
Aims. We probe the radiatively-efficient, hot wind feedback mode in two nearby luminous unobscured (type 1) AGN from the Close AGN Reference Survey (CARS), which show intriguing kpc-scale arc-like features of extended [O III]ionized gas as mapped with VLT-MUSE. We aimed to detect hot gas bubbles that would indicate the existence of powerful, galaxy-scale outflows in our targets, HE 0227–0931 and HE 0351+0240, from deep (200 ks) Chandra observations.
Methods. By measuring the spatial and spectral properties of the extended X-ray emission and comparing with the sub kpc-scale IFU data, we are able to constrain feedback scenarios and directly test if the ionized gas is due to a shocked wind.
Results. No extended hot gas emission on kpc-scales was detected. Unless the ambient medium density is low (n H ∼ 1 cm−3 at 100 pc), the inferred upper limits on the extended X-ray luminosities are well below what is expected from theoretical models at matching AGN luminosities.
Conclusions. We conclude that the highly-ionized gas structures on kpc scales are not inflated by a hot outflow in either target, and instead are likely caused by photoionization of pre-existing gas streams of different origins. Our nondetections suggest that extended X-ray emission from an AGN-driven wind is not universal, and may lead to conflicts with current theoretical predictions.
Key words: galaxies: active / galaxies: evolution
The scientific results reported in this article are based on observations made by the Chandra X-ray Observatory (PI: G. Tremblay, ID: 17700519), and on observations collected at the European Organization for Astronomical Research in the Southern Hemisphere under ESO program(s) 094.B-0345(A) (PI: B. Husemann).
© ESO 2018
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