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23 January 2025 |
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Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly$alpha$ emitters and IGM transmission in the COSMOS field at $zsim5$ | | Koki Kakiichi
; Joseph F. Hennawi
; Yoshiaki Ono
; Akio K. Inoue
; Masami Ouchi
; Richard S. Ellis
; Romain A. Meyer
; Sarah I. Bosman
; | | Date: |
1 Jan 2023 | | Abstract: | We present a novel technique called "photometric IGM tomography" to map the
intergalactic medium (IGM) at $zsimeq4.9$ in the COSMOS field. It utilizes
deep narrow-band (NB) imaging to photometrically detect faint Ly$alpha$ forest
transmission in background galaxies across the Subaru/Hyper-Suprime Cam (HSC)’s
$1.8
m,sq.,deg$ field of view and locate Ly$alpha$ emitters (LAEs) in the
same cosmic volume. Using ultra-deep HSC images and Bayesian spectral energy
distribution fitting, we measure the Ly$alpha$ forest transmission at
$zsimeq4.9$ along a large number ($140$) of background galaxies selected from
the DEIMOS10k spectroscopic catalogue at $4.98<z<5.89$ and the SILVERRUSH LAEs
at $zsimeq5.7$. We photometrically measure the mean Ly$alpha$ forest
transmission and achieve a result consistent with previous measurements based
on quasar spectra. We also measure the angular LAE-Ly$alpha$ forest
cross-correlation and Ly$alpha$ forest auto-correlation functions and place an
observational constraint on the large-scale fluctuations of the IGM around LAEs
at $zsimeq4.9$. Finally, we present the reconstructed 2D tomographic map of
the IGM, co-spatial with the large-scale structure of LAEs, at a transverse
resolution of $11 ,h^{-1}
m cMpc$ across $140,h^{-1}
m cMpc$ in the COSMOS
field at $zsimeq4.9$. We discuss the observational requirements and the
potential applications of this new technique for understanding the sources of
reionization, quasar radiative history, and galaxy-IGM correlations across
$zsim3-6$. Our results represent the first proof-of-concept of photometric IGM
tomography, offering a new route to examining early galaxy evolution in the
context of the large-scale cosmic web from the epoch of reionization to cosmic
noon. | | Source: | arXiv, 2301.00373 | | Services: | Forum | Review | PDF | Favorites | |
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