No Ly α emitters detected around a QSO at <i>z</i> = 6.4: Suppressed by the QSO?

Goto, Tomotsugu; Utsumi, Yousuke; Kikuta, Satoshi; Miyazaki, Satoshi; Shiki, Kensei; Hashimoto, Tetsuya

doi:10.1093/mnrasl/slx088

Cited by 23 publications

(30 citation statements)

References 36 publications

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“…The top panel of Figure 10 shows the predictions, which are indistinguishable for a single quasar field. Observations (middle panel; Bañados et al 2013;Mazzucchelli et al 2017;Goto et al 2017;Ota et al 2018) fall within the predicted ranges, which are extremely wide, in part due to Poisson statistics. The only measurement falling outside one of the predicted ranges is that of Goto et al (2017), which did not detect any sources 9 .…”

Section: Environments Of Z ∼ 6 Quasarsmentioning

confidence: 57%

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On the Prevalence of Supermassive Black Holes over Cosmic Time

Buchner

Treister

Bauer

et al. 2019

ApJ

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We investigate the abundance of Super-Massive Black Hole (SMBH) seeds in primordial galaxy halos. We explore the assumption that dark matter halos outgrowing a critical halo mass M c have some probability p of having spawned a SMBH seed. Current observations of local, intermediate-mass galaxies constrain these parameters: For M c = 10 11 M , all halos must be seeded, but when adopting smaller M c masses the seeding can be much less efficient. The constraints also put lower limits on the number density of black holes in the local and high-redshift Universe. Reproducing z ∼ 6 quasar space densities depends on their typical halo mass, which can be constrained by counting nearby Lyman Break Galaxies and Lyman Alpha Emitters. For both observables, our simulations demonstrate that single-field predictions are too diverse to make definitive statements, in agreement with mixed claims in the literature. If quasars are not limited to the most massive host halos, they may represent a tiny fraction (≈ 10 −5 ) of the SMBH population. Finally, we produce a wide range of predictions for gravitational events from SMBH mergers. We define a new diagnostic diagram for LISA to measure both SMBH space density and the typical delay between halo merger and black hole merger. While previous works have explored specific scenarios, our results hold independent of the seed mechanism, seed mass, obscuration, fueling methods and duty cycle.

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Section: Environments Of Z ∼ 6 Quasarsmentioning

confidence: 57%

“…Solid curves show the number of observed LAEs and continue as dotted when the edge of the field is reached. TheGoto et al (2017) field (green downward-pointing triangles) did not show any sources. Bottom panel : If 10 quasar fields are observed, the model predictions start to be distinguishable.…”

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confidence: 97%

On the Prevalence of Supermassive Black Holes over Cosmic Time

Buchner

Treister

Bauer

et al. 2019

ApJ

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“…We are cautious, however, that these results are based on the detection of a single LAE in the proximity of one z∼6.6 QSO. Previous studies (Decarli et al 2012;Bañados et al 2013;Mazzucchelli et al 2017b;Goto et al 2017), even if subjected to larger redshift uncertainties, did not report any evidence for an excess of LAEs in the proximity of z∼6 QSOs (but see Decarli et al 2017 for the detection of [C II] bright galaxies in the proximity of z∼6 QSOs). Measurements of the highredshift QSO-galaxy clustering in a statistical fashion is thus fundamental to discern among different scenarios proposed to explain the rapid formation of SMBHs at the end of cosmic reionization.…”

Section: Comparison To Qso-lae Clusteringmentioning

confidence: 92%

“…Both studies report a number of LAEs consistent with (or even lower than) expectations from a blank field. Goto et al (2017), using the Subaru Prime Focus Camera (Suprime-cam) on the Subaru telescope, similarly reported an underdensity of LAEs around the QSO CFHQSJ2329−0301 (z=6.4). It is worth mentioning that at slightly lower redshift, McGreer et al (2014) discovered an LAE in the immediate proximity (with a separation of only 11.4 kpc) of the z∼4.9 QSO SDSSJ0256+0019.…”

Section: Overdensity Of Laes Around the J0305−3150mentioning

confidence: 97%

Mapping the Lyα Emission around a z ∼ 6.6 QSO with MUSE: Extended Emission and a Companion at a Close Separation

Farina

Venemans

Decarli

et al. 2017

ApJ

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We utilize the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope to search for extended Lyα emission around the z∼6.6 QSO J0305−3150. After carefully subtracting the point spread function, we reach a nominal 5σ surface-brightness limit of SB 5σ =1.9×10−18 ergs −1 cm −2 arcsec −2 over a 1arcsec 2 aperture, collapsing fivewavelength slices centered at the expected location of the redshifted Lyα emission (i.e., at 9256 Å). Current data suggest the presence (5σ accounting for systematics) of a Lyα nebula that extends for 9 kpc around the QSO. This emission is displaced and redshifted by 155 km s −1 with respect to the location of the QSO host galaxy traced by the [C II] 158 μm emission line. The total luminosity is L Lya ( )=(3.0 ± 0.4)× 10 42 ergs −1 . Our analysis suggests that this emission is unlikely to rise from optically thick clouds illuminated by the ionizing radiation of the QSO. It is more plausible that the Lyα emission is due to the fluorescence of the highly ionized optically thin gas. This scenario implies a high hydrogen volume density of n 6 H~c m −3 . In addition, we detect a Lyα emitter (LAE) in the immediate vicinity of the QSO, i.e., with a projected separation of ∼12.5 kpc and a line-of-sight velocity difference of 560 km s . The probability of finding such a close LAE is one order of magnitude above the expectations based on the QSO-galaxy cross-correlation function. This discovery is in agreement with a scenario where dissipative interactions favor the rapid build-up of supermassive black holes at early cosmic times.

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“…′′ 62 and a 3σ limiting magnitude of 25.46 mag in a 1. ′′ 2 aperture (see also Goto et al 2017). The corresponding quantities for the combined N B906 image are 0.…”

Section: Data and Analysismentioning

confidence: 93%

Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly α haloes

Momose

Goto

Utsumi

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We first present new Subaru narrow-band observations of the Lyα halo around the quasi-stellar object (QSO) CFHQ J232908−030158 at z = 6.42, which give a higher luminosity with a larger extent than previous studies. Then, combining these measurements with available data in the literature, we find two different evolutions of QSOs' Lyα halos. First is a possible short-term evolution with QSO age seen in four z > 6 QSOs. We find that the luminosity and extent of Lyα halos anti-correlate with QSOs' IR luminosity, with J2329−0301's halo being the brightest and largest. It indicates that ionizing photons escape more easily out to circum-galactic regions when host galaxies are less dusty. We also find a positive correlation between IR luminosity and black hole mass (M BH ). Considering M BH as an indicator of QSO age, we propose a hypothesis that a large Lyα halo mainly comes into existence around QSOs in the young phase of their activity due to a small amount of dust. The second is an evolution with cosmic time seen over z ∼ 2 − 5. We find that the surface brightness increases toward lower-redshift with a similar growth rate to that of dark matter halos which evolve to M DH = 10 12 − 10 13 M ⊙ at z = 2. The extent of Lyα halos is also found to increase at a rate scaling with the virial radius of growing dark matter halos, r vir ∝ M 1/3 DH (1 + z) −1 . These increases are consistent with a scenario that the CGM around QSOs evolves in mass and size keeping pace with hosting dark matter halos.

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No Ly α emitters detected around a QSO at z = 6.4: Suppressed by the QSO?

Cited by 23 publications

References 36 publications

On the Prevalence of Supermassive Black Holes over Cosmic Time

On the Prevalence of Supermassive Black Holes over Cosmic Time

Mapping the Lyα Emission around a z ∼ 6.6 QSO with MUSE: Extended Emission and a Companion at a Close Separation

Possible evolution of the circum-galactic medium around QSOs with QSO age and cosmic time revealed by Ly α haloes

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