2024ApJ...965..134D

Query : 2024ApJ...965..134D

2024ApJ...965..134D - Astrophys. J., 965, 134 (2024/April-3)

Constraints on the Evolution of the Ionizing Background and Ionizing Photon Mean Free Path at the End of Reionization.

DAVIES F.B., BOSMAN S.E.I., GAIKWAD P., NASIR F., HENNAWI J.F., BECKER G.D., HAEHNELT M.G., D'ODORICO V., BISCHETTI M., EILERS A.-C., KEATING L.C., KULKARNI G., LAI S., MAZZUCCHELLI C., QIN Y., SATYAVOLU S., WANG F., YANG J. and ZHU Y.

Abstract (from CDS):

The variations in Lyα forest opacity observed at z > 5.3 between lines of sight to different background quasars are too strong to be caused by fluctuations in the density field alone. The leading hypothesis for the cause of this excess variance is a late, ongoing reionization process at redshifts below six. Another model proposes strong ionizing background fluctuations coupled to a short, spatially varying mean free path of ionizing photons, without explicitly invoking incomplete reionization. With recent observations suggesting a short mean free path at z ∼ 6, and a dramatic improvement in z > 5 Lyα forest data quality, we revisit this latter possibility. Here, we apply the likelihood-free inference technique of approximate Bayesian computation (ABC) to jointly constrain the hydrogen photoionization rate ΓHI and the mean free path of ionizing photons λmfp from the effective optical depth distributions at z = 5.0-6.1 from XQR-30. We find that the observations are well-described by fluctuating mean free path models with average mean free paths that are consistent with the steep trend implied by independent measurements at z ∼ 5-6, with a concomitant rapid evolution of the photoionization rate.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Intergalactic medium - Reionization

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SDSS J014837.63+060020.0 QSO 01 48 37.639 +06 00 20.01           ~ 86 0

Query : 2024ApJ...965..134D

Basic data :
SDSS J014837.63+060020.0 -- Quasar
Other object types: otypes_help 		QSO (2014AJ,QSO), Opt (PSO,SDSS), NIR (ULAS), MIR (WISE)
ICRS coord. (ep=J2000) : 		01 48 37.639 +06 00 20.01 (Optical) [ 69 68 86 ] C 2012ApJS..203...21A
FK4 coord. (ep=B1950 eq=1950) : 		01 46 00.780 +05 45 25.65 [ 69 68 86 ]
Gal coord. (ep=J2000) : 		147.689882 -54.094185 [ 69 68 86 ]
Radial velocity / Redshift / cz : 		V(km/s) 287538 [~] / z(spectroscopic) 5.923 [~] / cz 1775671 [~]
   (Opt) D 2015AJ....149..188J
Fluxes (8) :
J (AB) 19.114 [0.0216] C 2020MNRAS.494..789R
H (AB) 19.125 [0.0706] C 2020MNRAS.494..789R
K (AB) 19.022 [0.0760] C 2020MNRAS.494..789R
u (AB) 24.9 [0.8] E 2015ApJS..219...12A
g (AB) 24.9 [0.5] E 2015ApJS..219...12A
r (AB) 24.69 [0.59] E 2012ApJS..203...21A
i (AB) 22.35 [0.18] D 2012ApJS..203...21A
z (AB) 19.45 [0.01] C 2016ApJS..227...11B
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Identifiers (5) :
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QSO J0148+0600 SDSS J014837.63+060020.0 WISE J014837.65+060020.5
PSO J027.1568+06.0055 ULAS J014837.63+060020.0

References (86 between 1850 and 2026) (Total 86)
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Velocities : 2   

   

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Data at NED - NASA/IPAC Extragalactic Database : SDSS J014837.63+060020.0

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SDSS J014837.63+060020.0 ULAS J014837.63+060020.0 WISE J014837.65+060020.5

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