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http://hdl.handle.net/20.500.12386/30108
Titolo: | Absorption systems at z∼ 2 as a probe of the circumgalactic medium: a probabilistic approach | Autori: | Mongardi, C. VIEL, MATTEO D'ODORICO, Valentina Kim, T. -S. Barai, P. MURANTE, Giuseppe Monaco, Pierluigi |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 478 | Fascicolo: | 3 | Da pagina:: | 3266 | Abstract: | We characterize the properties of the intergalactic medium (IGM) around a sample of galaxies extracted from state-of-the-art hydrodynamical simulations of structure formation in a cosmological volume of 25 Mpc comoving at z∼ 2. The simulations are based on two different subresolution schemes for star formation and supernova feedback: the Multi-Phase Particle Integrator (MUPPI) scheme and the Effective Model. We develop a quantitative and probabilistic analysis based on the apparent optical depth method of the properties of the absorbers as a function of impact parameter from their nearby galaxies: in such a way, we probe different environments from circumgalactic medium to low-density filaments. Absorbers' properties are then compared with a spectroscopic observational data set obtained from high-resolution quasar spectra. Our main focus is on the N_{C IV}-N_{H I} relation around simulated galaxies: the results obtained with MUPPI and the Effective model are remarkably similar, with small differences only confined to regions at impact parameters b = [1 - 3] × r<SUB>vir</SUB>. Using C IV as a tracer of the metallicity, we obtain evidence that the observed metal absorption systems have the highest probability to be confined in a region of 150-400kpc around galaxies. Near-filament environments have instead metallicities too low to be probed by present-day telescopes, but could be probed by future spectroscopical studies. Finally, we compute C IV covering fractions which are in agreement with observational data. | URI: | http://hdl.handle.net/20.500.12386/30108 | URL: | http://arxiv.org/abs/1706.06123v2 https://academic.oup.com/mnras/article/478/3/3266/4999912 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty1283 | Bibcode ADS: | 2018MNRAS.478.3266M | Fulltext: | open |
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