The MUSE Extremely Deep Field: a first panoramic view of an Mg II emitting intragroup medium

Abstract

Using the exquisite MUSE eXtremely Deep Field data, we report the discovery of an MgII emission nebula with an area above a 2$\sigma$ significance level of 1000 proper kpc${}^2$, providing the first panoramic view of the spatial distribution of magnesium in the intragroup medium of a low mass group of five star-forming galaxies at z=1.31. The galaxy group members are separated by less than 50 physical kpc in projection and $\approx$120 km/s in velocity space. The most massive galaxy has a stellar mass of 10${}^{9.35}$ M${}_{\odot }$ and shows an MgII P-Cygni line profile indicating the presence of an outflow, which is consistent with the spatially resolved spectral analysis showing $\approx +$120 km/s shift of the MgII emission lines with respect to the systemic redshift. The other galaxies are less massive and only show MgII in emission. The detected MgII nebula has a maximal projected extent of $\approx$70 kpc including a low surface brightness (2 $\times$ 10${}^{-19}$ erg/s/cm${}^2$/arcsec${}^2$) gaseous bridge between two subgroups of galaxies. The presence of absorption features in the spectrum of a background galaxy located at an impact parameter of 19 kpc from the closest galaxy of the group indicates the presence of gas enriched in magnesium even beyond the detected nebula seen in emission, suggesting that we are observing the tip of a larger intragroup medium. The observed MgII velocity gradient suggests an overall rotation of the structure along the major axis of the most massive galaxy. Our MUSE data also reveal extended Fe II* emission in the vicinity of the most massive galaxy, aligned with its minor axis. Extended [OII] emission is found around the galaxy group members and at the location of the MgII bridge. Our results suggest that both tidal stripping effects from galaxy interactions and outflows are enriching the intragroup medium of this system.

Submitted to A&A. Referee's first comments implemented

References in corpus (39)

• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• The MUSE second-generation VLT instrument
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• The Data Processing Pipeline for the MUSE Instrument
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• Scaling Properties of a Complete X-ray Selected Galaxy Group Sample
• Resolving small-scale cold circumgalactic gas in TNG50
• UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field
• The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
• New perspectives on strong z=0.5 MgII absorbers: are halo-mass and equivalent width anti-correlated?
• MusE GAs FLOw and Wind (MEGAFLOW) II. A study of gas accretion around $z\approx 1$ star-forming galaxies with background quasars
• Quasars Probing Galaxies: I. Signatures of Gas Accretion at Redshift Approximately 0.2
• A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
• The SINFONI MgII Program for Line Emitters (SIMPLE): Discovering starbursts near QSO sight-lines
• Simulating Groups and the IntraGroup Medium: The Surprisingly Complex and Rich Middle Ground Between Clusters and Galaxies
• Optically-Thin Spatially-Resolved Mg II Emission Maps the Escape of Ionizing Photons
• Scaling Properties of Galaxy Groups
• On the HI content, dust-to-gas ratio and nature of MgII absorbers
• The MUSE Extremely Deep Field: the Cosmic Web in Emission at High Redshift
• The Clustering of MgII Absorption Systems at z=0.5 and Detection of Cold Gas in Massive Halos
• A Semi-Analytical Line Transfer (SALT) model to interpret the spectra of galaxy outflows
• MusE GAs FLOw and Wind (MEGAFLOW) VIII. Discovery of a MgII emission halo probed by a quasar sightline
• Nature of the Absorbing Gas associated with a Galaxy Group at z~0.4
• Galaxy mergers moulding the circum-galactic medium - I. The impact of a major merger
• Illuminating gas in-/outflows in the MUSE deepest fields: discovery of Ly-alpha nebulae around forming galaxies at z~3.3
• Observational signatures of a warped disk associated with cold-flow accretion
• UV absorption lines and their potential for tracing the Lyman continuum escape fraction
• A collisional origin for the Leo ring
• A Giant Intragroup Nebula Hosting a Damped Lya Absorber at z=0.313
• Ionised gas structure of 100 kpc in an over-dense region of the galaxy group COSMOS-Gr30 at z ~ 0.7
• Deep Chandra observations of the stripped galaxy group falling into Abell 2142
• The MUSE Hubble Ultra Deep Field Survey: VII. FeII* Emission in Star-Forming Galaxies
• ORIGIN: Blind detection of faint emission line galaxies in MUSE datacubes
• Recovery and analysis of rest-frame UV emission lines in 2052 galaxies observed with MUSE at $1.5<z<6.4$
• A VLT/FORS2 Narrowband Imaging Search for MgII Emission Around z ~ 0.7 Galaxies

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