Journal article
Strongly time-variable ultraviolet metal-line emission from the circum-galactic medium of high-redshift galaxies
Monthly notices of the Royal Astronomical Society, v 463(1), pp 120-133
21 Nov 2016
Abstract
We use cosmological simulations from the Feedback In Realistic Environments project, which implement a comprehensive set of stellar feedback processes, to study ultraviolet (UV) metal-line emission from the circum-galactic medium of high-redshift (z = 2-4) galaxies. Our simulations cover the halo mass range M-h 2 x 10(11)-8.5 x 10(12) M-aS (TM) at z = 2, representative of Lyman break galaxies. Of the transitions we analyse, the low-ionization C iii (977 ) and Si iii (1207 ) emission lines are the most luminous, with C iv (1548 ) and Si iv (1394 ) also showing interesting spatially extended structures. The more massive haloes are on average more UV-luminous. The UV metal-line emission from galactic haloes in our simulations arises primarily from collisionally ionized gas and is strongly time variable, with peak-to-trough variations of up to 2 dex. The peaks of UV metal-line luminosity correspond closely to massive and energetic mass outflow events, which follow bursts of star formation and inject sufficient energy into galactic haloes to power the metal-line emission. The strong time variability implies that even some relatively low-mass haloes may be detectable. Conversely, flux-limited samples will be biased towards haloes whose central galaxy has recently experienced a strong burst of star formation. Spatially extended UV metal-line emission around high-redshift galaxies should be detectable by current and upcoming integral field spectrographs such as the Multi Unit Spectroscopic Explorer on the Very Large Telescope and Keck Cosmic Web Imager.
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Details
- Title
- Strongly time-variable ultraviolet metal-line emission from the circum-galactic medium of high-redshift galaxies
- Creators
- Niharika Sravan - Northwestern UniversityClaude-Andre Faucher-Giguere - Northwestern Univ, CIERA, 2145 Sheridan Rd, Evanston, IL 60208 USAFreeke van de Voort - Institute of Astronomy and Astrophysics, Academia SinicaDusan Keres - UC San Diego Health SystemAlexander L. Muratov - UC San Diego Health SystemPhilip F. Hopkins - California Institute of TechnologyRobert Feldmann - Berkeley CollegeEliot Quataert - Berkeley CollegeNorman Murray - University of Toronto
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 463(1), pp 120-133
- Publisher
- Oxford Univ Press
- Number of pages
- 14
- Grant note
- David and Lucile Packard Foundation; The David & Lucile Packard Foundation 1411920 / Division Of Astronomical Sciences; Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) Thomas Alison Schneider Chair in Physics at UC Berkeley NNX14AH35G; 12-APT12-0183 / NASA ATP grant NNX15AB22G; NAS 5-26555 / NASA; National Aeronautics & Space Administration (NASA) HF-51304.01-A / NASA through Hubble Fellowship - Space Telescope Science Institute University of California, San Diego; University of California System Simons Investigator award from Simons Foundation 1412153; 1412836 / Direct For Mathematical & Physical Scien; Division Of Astronomical Sciences; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) 1450006 / Division Of Graduate Education; Direct For Education and Human Resources; National Science Foundation (NSF); NSF - Directorate for STEM Education (EDU) Northwestern University AST-1412836; AST-1517491; AST-1412153; 1411920; 1455342 / NSF; National Science Foundation (NSF) Alfred P. Sloan Research Fellowship; Alfred P. Sloan Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000386464900010
- Scopus ID
- 2-s2.0-85015693487
- Other Identifier
- 991021877481804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics