The MUSE 3D view of feedback in a high-metallicity radio galaxy at z = 2.9
| Autor: | M. Villar-Martin, Andrew Humphrey, Maiqueli F. da Silva, R. A. E. Fosbury, S. di Serego Alighieri, Roderik Overzier, Luc Binette, S. G. Morais, Joel Vernet, A. Cimatti, P. Lagos |
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| Přispěvatelé: | Silva, M., Humphrey, A., Lagos, P., Villar-Martín, M., Morais, S.G., Alighieri, S. di Serego, Cimatti, A., Fosbury, R., Overzier, R.A., Vernet, J., Binette, L. |
| Rok vydání: | 2017 |
| Předmět: |
Radio galaxy
Astrophysics::High Energy Astrophysical Phenomena Metallicity FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Photoionization Astrophysics 01 natural sciences Ion Ionization 0103 physical sciences Galaxies: individual: MRC 0943-242 Quasars: absorption line Astrophysics::Solar and Stellar Astrophysics Emission spectrum 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics Nebula 010308 nuclear & particles physics Galaxies: high-redshift Quasars: emission line Galaxies: evolution Astronomy and Astrophysics Galaxies: active Astronomy and Astrophysic Astrophysics - Astrophysics of Galaxies Blueshift Galaxies: ISM Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 474:3649-3672 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stx3019 |
| Popis: | We present a detailed study of the kinematic, chemical and excitation properties of the giant Ly$\alpha$ emitting nebula and the giant \ion{H}{I} absorber associated with the $z = 2.92$ radio galaxy MRC 0943--242, using spectroscopic observations from VLT/MUSE, VLT/X-SHOOTER and other instruments. Together, these data provide a wide range of rest-frame wavelength (765 \AA$\,$ -- 6378 \AA$\,$ at $z = 2.92$) and 2D spatial information. We find clear evidence for jet gas interactions affecting the kinematic properties of the nebula, with evidence for both outflows and inflows being induced by radio-mode feedback. We suggest that the regions of relatively lower ionization level, spatially correlated with the radio hotspots, may be due to localised compression of photoionized gas by the expanding radio source, thereby lowering the ionization parameter, or due to a contribution from shock-heating. We find that photoionization of super-solar metallicity gas ($Z/Z_{\odot}$ = 2.1) by an AGN-like continuum ($\alpha$=--1.0) at a moderate ionization parameter ($U$ = 0.018) gives the best overall fit to the complete X-SHOOTER emission line spectrum. We identify a strong degeneracy between column density and Doppler parameter such that it is possible to obtain a reasonable fit to the \ion{H}{I} absorption feature across the range log N(\ion{H}{I}/cm$^{-2}$) = 15.20 and 19.63, with the two best-fitting occurring near the extreme ends of this range. The extended \ion{H}{I} absorber is blueshifted relative to the emission line gas, but shows a systematic decrease in blueshift towards larger radii, consistent with a large scale expanding shell. Comment: 25 pages, 18 figures, 10 tables. Accepted for publication in MNRAS. Published: 23 November 2017 |
| Databáze: | OpenAIRE |
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