Mapping the Morphology and Kinematics of a Lyman-alpha-selected Nebula at z=3.15 with MUSE

Abstract

Recent wide-field integral field spectroscopy has revealed the detailed properties of high redshift Lyman-alpha (Lya) nebulae, most often targeted due to the presence of an active galactic nucleus (AGN). Here, we use VLT/MUSE to resolve the morphology and kinematics of a nebula initially identified due to strong Lya emission at $z\sim 3.2$ (LABn06; Nilsson et al. 2006). Our observations reveal a two-lobed Lya nebula, at least $\sim$173 pkpc in diameter, with a light-weighted centroid near a mid-infrared source (within $\approx$17.2 pkpc) that appears to host an obscured AGN. The Lya emission near the AGN is also coincident in velocity with the kinematic center of the nebula, suggesting that the nebula is both morphologically and kinematically centered on the AGN. Compared to AGN-selected Lya nebulae, the surface brightness profile of this nebula follows a typical exponential profile at large radii ($>$25 pkpc), although at small radii, the profile shows an unusual dip at the location of the AGN. The kinematics and asymmetry are similar to, and the CIV and HeII upper limits are consistent with other AGN-powered Lya nebulae. Double-peaked and asymmetric line profiles suggest that Lya resonant scattering may be important in this nebula. These results support the picture of the AGN being responsible for powering a Lya nebula that is oriented roughly in the plane of the sky. Further observations will explore whether the central surface brightness depression is indicative of either an unusual gas or dust distribution or variation in the ionizing output of the AGN over time.

19 pages, 9 figures, 2 tables, accepted to ApJ

References in corpus (22)

• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The MUSE second-generation VLT instrument
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• The Data Processing Pipeline for the MUSE Instrument
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• A Population of Faint Extended Line Emitters and the Host Galaxies of Optically Thick QSO Absorption Systems
• Optical spectroscopy and X-ray detections of a sample of quasars and AGN selected in the mid-infrared from two Spitzer wide-area surveys
• Spitzer's Contribution to the AGN Population
• The far-infrared/radio correlation and radio spectral index of galaxies in the SFR-M* plane up to z 2
• Inspiraling Halo Accretion Mapped in Lyman-$\alpha$ Emission around a $z\sim 3$ Quasar
• Extended Lyman alpha emission around bright quasars
• A Keck/DEIMOS Spectroscopy of Lyman Alpha Blobs at Redshift z=3.1
• VIMOS-VLT spectroscopy of the giant Ly-alpha nebulae associated with three z~2.5 radio galaxies
• Illuminating gas in-/outflows in the MUSE deepest fields: discovery of Ly-alpha nebulae around forming galaxies at z~3.3
• Spatially Resolved Gas Kinematics within a Ly$\alpha$ Nebula: Evidence for Large-scale Rotation
• SDSS-IV eBOSS Spectroscopy of X-ray and WISE AGN in Stripe 82X: Overview of the Demographics of X-ray and Mid-Infrared Selected Active Galactic Nuclei
• A Deep Narrowband Imaging Search for CIV and He II Emission from Ly$\alpha$ Blobs
• An obscured AGN population hidden in the VIPERS galaxies: identification through spectral energy distribution decomposition
• Overturning the Case for Gravitational Powering in the Prototypical Cooling Lyman-alpha Nebula
• A Lyα blob and zabs {\approx} zem damped Lyα absorber in the dark matter halo of the binary quasar Q 0151+048
• Probing the AGN Unification Model at redshift z $\sim$ 3 with MUSE observations of giant Ly$\alpha$ nebulae
• MUSE-inspired view of the quasar Q2059-360, its Lyman alpha blob, and its neighborhood

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