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Title:
Ionized outflows in luminous type 2 AGNs at z < 0.6: no evidence for significant impact on the host galaxies
Authors:
Villar-Martín, M.; Arribas, S.; Emonts, B.; Humphrey, A.; Tadhunter, C.; Bessiere, P.; Cabrera Lavers, A.; Ramos Almeida, C.
Affiliation:
AA(Centro de Astrobiología (INTA-CSIC), Carretera de Ajalvir, km 4, E-28850 Torrejón de Ardoz, Madrid, Spain; Astro-UAM, UAM, Unidad Asociada CSIC, Facultad de Ciencias, Campus de Cantoblanco, E-28049 Madrid, Spain; ), AB(Centro de Astrobiología (INTA-CSIC), Carretera de Ajalvir, km 4, E-28850 Torrejón de Ardoz, Madrid, Spain; Astro-UAM, UAM, Unidad Asociada CSIC, Facultad de Ciencias, Campus de Cantoblanco, E-28049 Madrid, Spain), AC(Centro de Astrobiología (INTA-CSIC), Carretera de Ajalvir, km 4, E-28850 Torrejón de Ardoz, Madrid, Spain; Astro-UAM, UAM, Unidad Asociada CSIC, Facultad de Ciencias, Campus de Cantoblanco, E-28049 Madrid, Spain), AD(Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal), AE(Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK), AF(Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile), AG(Instituto de Astrofísica de Canarias (IAC), C/ Vía Láctea, s/n, E-38205 La Laguna, Tenerife, Spain), AH(Instituto de Astrofísica de Canarias (IAC), C/ Vía Láctea, s/n, E-38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 1, p.130-162 (MNRAS Homepage)
Publication Date:
07/2016
Origin:
OUP
Astronomy Keywords:
galaxies: active, galaxies: evolution, quasars: emission lines, quasars: general
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw901
Bibliographic Code:
2016MNRAS.460..130V

Abstract

We investigate the presence of extended ionized outflows in 18 luminous type 2 AGNs (11 quasars and 7 high-luminosity Seyfert 2s) at 0.3 < z < 0.6 based on VLT-FORS2 spectroscopy. We infer typical lower limits on the radial sizes of the outflows Ro ≳ several × 100 pc and upper limits Ro ≲ 1-2 kpc. Our results are inconsistent with related studies which suggest that large scale (Ro ˜ several-15 kpc) are ubiquitous in QSO2. We study the possible causes of discrepancy and propose that seeing smearing is the cause of the large inferred sizes. The implications in our understanding of the feedback phenomenon are important since the mass Mo (through the density), mass injection skew3dot{M}_o and energy injection dot{E}_o rates of the outflows become highly uncertain. One conclusion seems unavoidable: Mo, skew3dot{M}_o and dot{E}_o are modest or low compared with previous estimations. We obtain typically Mo ≲ (0.4-22) × 106 M&sun; (median 1.1 × 106 M&sun;) assuming n = 1000 cm-3. These are ˜102-104 times lower than values reported in the literature. Even under the most favourable assumptions, we obtain \dot{M}_o ≲ 10 M&sun; yr-1 in general, 100-1000 times lower than claimed in related studies. Although the uncertainties are large, it is probable that these are lower than typical star-forming rates. In conclusion, no evidence is found supporting that typical outflows can affect the interstellar medium of the host galaxies across spatial scales ≳ 1-2 kpc.
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