The giant Ly<i>α</i> nebula associated with a <i>z</i> = 2.5 radio galaxy

Villar-Martı́n, M.; Sanchez, Sebastian Francisco Sanchez; Peletier, Reynier F.; Vernet, J.; Breuck, C. De; Humphrey, A.; Alighieri, S. Serego Di; Fosbury, R. A. E.; Stern, Daniel

doi:10.1002/asna.200510504

Cited by 4 publications

(4 citation statements)

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“…However, higher σ v values have been reported for CEN around some RQQs and radio-loud sources (B16; Ginolfi et al 2018). For the latter, the high σ v is likely due to the jets mechanical interaction with the Lyα-CEN (van Ojik et al 1997;Villar-Martín et al 2006;Silva et al 2018).…”

Section: Introductionmentioning

confidence: 93%

“…The first circum-galactic medium (CGM) emission nebulae detected in Lyα (Lyα-CEN hereafter) were mostly observed around high redshift radio galaxies with sizes exceeding 100 kpc, through narrow-band (NB) imaging and slit spectroscopy (e.g. Heckman et al 1991;van Ojik et al 1997;Villar-Martín et al 2006, 2007aHumphrey et al 2007Humphrey et al , 2013. Only a minor fraction (∼10%) of them were reported around radio-quiet quasars (RQQs; e.g.…”

Section: Introductionmentioning

confidence: 99%

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The WISSH quasars project

Travascio

Zappacosta

Cantalupo

et al. 2020

A&A

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Context. In recent years, Lyα nebulae have been routinely detected around high redshift, radio-quiet quasars thanks to the advent of the highly sensitive integral field spectrographs. Constraining the physical properties of the Lyα nebulae is crucial for a full understanding of the circum-galactic medium (CGM). The CGM acts both as a repository for intergalactic and galactic baryons as well as a venue of feeding and feedback processes. The most luminous quasars are privileged test-beds to study these processes, given their large ionising fluxes and dense CGM environments in which they are expected to be embedded. Aims. We aim to characterise the rest-frame ultraviolet (UV) emission lines in the CGM around a hyper-luminous, broad emission line, radio-quiet quasar at z ∼ 3.6, which exhibits powerful outflows at both nuclear and host galaxy scales. Methods. We analyse VLT/MUSE observations of the quasar J1538+08 (Lbol = 6 × 1047 erg s−1), and we performed a search for extended UV emission lines to characterise its morphology, emissivity, kinematics, and metal content. Results. We report the discovery of a very luminous (∼2 × 1044 erg s−1), giant Lyα nebula and a likely associated extended (75 kpc) CIV nebula. The Lyα nebula emission exhibits moderate blueshift (∼440 km s−1) compared to the quasar systemic redshift and a large average velocity dispersion (σ¯v ∼ 700 km s−1) across the nebula, while the CIV nebula shows average velocity dispersion of σ¯v ∼ 350 km s−1. The Lyα line profile exhibits a significant asymmetry towards negative velocity values at 20−30 kpc south of the quasar and is well parametrised by the following two Gaussian components: a narrow (σ ∼ 470 km s−1) systemic one plus a broad (σ ∼ 1200 km s−1), blueshifted (∼1500 km s−1) one. Conclusions. Our analysis of the MUSE observation of J1538+08 reveals metal-enriched CGM around this hyper-luminous quasar. Furthermore, our detection of blueshifted emission in the emission profile of the Lyα nebula suggests that powerful nuclear outflows can propagate through the CGM over tens of kiloparsecs.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The WISSH quasars project

Travascio

Zappacosta

Cantalupo

et al. 2020

A&A

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“…Narrow-band surveys for Lyman-α (Lyα) emitting galaxies at high redshift have recently revealed a number of luminous (up to 5 × 10 43 erg s −1 ), very extended (from a few times ten kpc to more than 150 kpc) Lyα-emitting objects, so-called Lyα "blobs" (Fynbo et al 1999;Keel et al 1999;Steidel et al 2000;Francis et al 2001;Matsuda et al 2004;Palunas et al 2004;Dey et al 2005;Villar-Martin et al 2005). At least three mechanisms have been suggested as energy sources for Lyα blobs.…”

Section: Introductionmentioning

confidence: 99%

A Lyman-α blob in the GOODS South field: evidence for cold accretion onto a dark matter halo

Nilsson

Fynbo²,

Møller³

et al. 2006

A&A

146

188

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We report on the discovery of a z = 3.16 Lyman-α emitting blob in the Great Observatories Origins Deep Survey (GOODS) South field. The discovery was made with the VLT, through narrow-band imaging. The blob has a total Lyα luminosity of ∼10 43 erg s −1 and a diameter larger than 60 kpc. The available multi-wavelength data in the GOODS field consists of 13 bands from X-rays (Chandra) to infrared (Spitzer). Unlike other known Lyα blobs, this blob shows no obvious continuum counter-parts in any of the broad-bands. In particular, no optical counter-parts are found in deep HST/ACS imaging. For previously published blobs, AGN (Active Galactic Nuclei) or "superwind" models have been found to provide the best match to the data. We here argue that the most probable origin of the extended Lyα emission from this blob is cold accretion onto a dark matter halo.

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“…Previous IFS studies of EELRs around RLQs have focused on optical emission lines from low redshift objects (e.g. Durret et al 1994;Crawford & Vanderriest 2000;Sánchez et al 2004;Christensen et al 2006), or the analysis of a single radio galaxy (Villar-Martín et al 2005). IFS is well suited for this purpose because of the possibility to create narrow-band images at any suitable wavelength with an adjustable band width, and to simultaneously investigate velocity profiles.…”

Section: Introductionmentioning

confidence: 99%

Extended Lyman-α emission around bright quasars

Christensen

Jahnke

Wisotzki

et al. 2006

A&A

Self Cite

131

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Context. Quasars trace the most massive structures at high redshifts and their presence may influence the evolution of the massive host galaxies. Aims. We study the extended Lyα emission line regions (EELRs) around seven bright, mostly radio-quiet quasars (QSOs) at 2.7 < z < 4.5, and compare luminosities with EELRs around radio-loud QSOs reported in the literature. Methods. Using integral field spectroscopy, we analyse the morphology and kinematics of the quiescent Lyα EELRs around the QSOs. Results. We find evidence for the presence of EELRs around four radio-quiet and one radio-loud QSO. All EELRs appear asymmetric and the optically brightest QSOs also have the brightest Lyα nebulae. For the two brightest nebulae we find velocities between ∼600 km s −1 at the QSO position to ∼200 km s −1 at a distance of 3 − 4 ′′ from the QSO and surface flux densities up to 2-3×10 −16 erg cm −2 s −1 arcsec −2 . The five EELRs have total Lyα luminosities which correspond to ∼0.5% of the luminosities from the QSOs broad Lyα emission lines. This fraction is an order of magnitude smaller than found for EELRs around radio-loud, steep spectrum QSOs reported in the literature. While the nebulae luminosities are correlated with the QSO Lyα luminosities, we find that nebulae luminosities are not correlated with the central QSO ionising fluxes. Conclusions. The presence of gas in the EELRs can be interpreted based on two competing scenarios: either from quasar feedback mechanisms, or from infalling matter. Apart from these two effects, the Lyα flux around radio-loud objects can be enhanced due to interactions with the radio jets. The relatively fainter nebulae around radio-quiet QSOs compared to lobe-dominated radio-loud QSOs can be ascribed to this effect, or to significant differences in the environments between the two classes.

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The giant Lyα nebula associated with a z = 2.5 radio galaxy

Cited by 4 publications

References 16 publications

The WISSH quasars project

The WISSH quasars project

A Lyman-α blob in the GOODS South field: evidence for cold accretion onto a dark matter halo

Extended Lyman-α emission around bright quasars

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