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

被引：24

作者：

Davies, Frederick B. ^{[1
]}

Bosman, Sarah E. I. ^{[1
,2
]}

Gaikwad, Prakash ^{[1
]}

Nasir, Fahad ^{[1
]}

Hennawi, Joseph F. ^{[3
,4
]}

Becker, George D. ^{[5
]}

Haehnelt, Martin G. ^{[6
,7
]}

D'Odorico, Valentina ^{[8
,9
,10
]}

Bischetti, Manuela ^{[11
,12
]}

Eilers, Anna-Christina ^{[13
]}

Keating, Laura C. ^{[14
]}

Kulkarni, Girish ^{[15
]}

Lai, Samuel ^{[16
]}

Mazzucchelli, Chiara ^{[17
]}

Qin, Yuxiang ^{[18
,19
]}

Satyavolu, Sindhu ^{[15
]}

Wang, Feige ^{[20
]}

Yang, Jinyi ^{[20
]}

Zhu, Yongda ^{[5
]}

机构：

[1] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[2] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 12, D-69120 Heidelberg, Germany

[3] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[4] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[5] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[6] Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[7] Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[8] INAF Osservatorio Astron Trieste, Via Tiepolo 11, I-34143 Trieste, Italy

[9] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy

[10] IFPU, Via Beirut 2, I-34151 Trieste, Italy

[11] INAF, Osservatorio Astronom Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy

[12] Univ Trieste, Dipartimento Fis, Sez Astron, Via Tiepolo 11, I-34143 Trieste, Italy

[13] MIT Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[14] Univ Edinburgh, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Scotland

[15] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, India

[16] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[17] Univ Diego Portales, Inst Estudios Astrofis, Fac Ingn & Ciencias, Ave Ejercito Libertador 441, Santiago, Chile

[18] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[19] ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Stromlo, Australia

[20] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 965卷 / 02期

关键词：

LY-ALPHA FOREST; COLUMN DENSITY DISTRIBUTION; ACTIVE GALACTIC NUCLEI; EQUATION-OF-STATE; INTERGALACTIC MEDIUM; LYMAN-ALPHA; HYDROGEN REIONIZATION; LUMINOSITY FUNCTION; RADIATIVE-TRANSFER; NEUTRAL FRACTION;

D O I：

10.3847/1538-4357/ad1d5d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The variations in Ly alpha 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 similar to 6, and a dramatic improvement in z > 5 Ly alpha 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 Gamma(HI) and the mean free path of ionizing photons lambda(mfp) 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 similar to 5-6, with a concomitant rapid evolution of the photoionization rate.

引用

页数：17

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