A [C ii] 158 μm emitter associated with an O i absorber at the end of the reionization epoch

Wu, Yican; Cai, Zheng; Neeleman, Marcel; Finlator, Kristian; Prochaska, J. X.; Wang, Ran; Emonts, Bjorn; Fan, Xiaohui; Keating, Laura C.; Wang, Feige; Yang, Jinyi; Wang, Junxian

doi:10.1038/s41550-021-01471-4

“…This observed difference in behavior is of great interest for understanding changes in the CGM that may be linked to the global reionization process. Currently, however, the observational identification of the galaxies associated with the metal absorption systems at these redshifts is very limited (Díaz et al 2021;Wu et al 2021) because of the general difficulty of measuring spectroscopic redshifts of such high-z faint galaxies.…”

Section: Introductionmentioning

confidence: 99%

EIGER. I. A Large Sample of [O iii]-emitting Galaxies at 5.3 < z < 6.9 and Direct Evidence for Local Reionization by Galaxies

Kashino

¹

,

Lilly

²

,

Matthee

³

et al. 2023

ApJ

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We present a first sample of 117 [O iii] λλ4960, 5008–selected star-forming galaxies at 5.33 < z < 6.93 detected in JWST/NIRCam 3.5 μm slitless spectroscopy of a 6 .′ 5 × 3 .′ 4 field centered on the hyperluminous quasar SDSS J0100+2802, obtained as part of the Emission-line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) survey. Three prominent galaxy overdensities are observed, one of them at the redshift of the quasar. Galaxies are found within 200 pkpc and 105 km s−1 of four known metal absorption-line systems. We focus on the role of the galaxies in ionizing the intergalactic medium (IGM) during the later stages of cosmic reionization and construct the mean Lyα and Lyβ transmission as a function of distance from the galaxies. At the lowest redshifts in our study, 5.3 < z < 5.7, the IGM transmission rises monotonically with distance from the galaxies, as seen previously at lower redshifts. In contrast, at 5.7 < z < 6.14, the transmission of both Lyα and Lyβ first increases with distance but then peaks at a distance of 5 cMpc before declining. Finally, in the region 6.15 < z < 6.26, where the additional ionizing radiation from the quasar dominates, the monotonic increase in transmission with distance is reestablished. This result is interpreted to represent evidence that the transmission of the IGM at z ∼ 5.9 toward J0100+2802 results from the “local” ionizing radiation of galaxies that dominates over the much-reduced cosmic background.

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“…

The physical conditions of the circumgalactic medium are probed by intervening absorption-line systems in the spectrum of background quasistellar objects out to the epoch of cosmic reionization [1][2][3][4]. A correlation between the ionization state of the absorbing gas and the nature of the nearby galaxies has been suggested by the sources detected either in Lyα or [C ii] 158 µm near to respectively highly-ionized and neutral absorbers [5,6]. This is also likely linked to the global changes in the incidence of absorption systems of different types and the process of cosmic reionization [7][8][9][10][11][12].

…”

mentioning

confidence: 99%

Compact [C ii] emitters around a C iv absorption complex at redshift 5.7

Kashino

¹

,

Lilly

²

,

Simcoe

³

et al. 2023

Nature

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The physical conditions of the circumgalactic medium are probed by intervening absorption-line systems in the spectrum of background quasistellar objects out to the epoch of cosmic reionization [1][2][3][4]. A correlation between the ionization state of the absorbing gas and the nature of the nearby galaxies has been suggested by the sources detected either in Lyα or [C ii] 158 µm near to respectively highly-ionized and neutral absorbers [5,6]. This is also likely linked to the global changes in the incidence of absorption systems of different types and the process of cosmic reionization [7][8][9][10][11][12]. Here we report the detection of two [C ii]-emitting galaxies at redshift z ≈ 5.7 that are associated with a

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“…Our sample contains five (six) QSO (absorber) fields. Combined with Wu et al (2021), we describe the observations of all five QSO fields in this paper.…”

Section: Survey Descriptionmentioning

confidence: 99%

“…We chose to use ALMA because it also provides us with deep continuum observations, which will allow us to investigate the source densities/environment of these high-z QSOs. Previously, Wu et al (2021) reported the results in the field of QSO J2054−0005. Here, we follow up on work and present observations of the additional four fields.…”

Section: Introductionmentioning

confidence: 99%

Searching for C ii Emission from the First Sample of z ∼ 6 O i Absorption-associated Galaxies with the Atacama Large Millimeter/submillimeter Array

Wu,

Cai,

Li

et al. 2023

ApJ

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3

0

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We report the first statistical analyses of [C ii] and dust continuum observations in six strong O i absorber fields at the end of the reionization epoch obtained by the Atacama Large Millimeter/submillimeter Array (ALMA). Combined with one [C ii] emitter reported in Wu et al., we detect one O i-associated [C ii] emitter in six fields. At redshifts of O i absorbers in nondetection fields, no emitters are brighter than our detection limit within impact parameters of 50 kpc and velocity offsets between ±200 km s−1. The averaged [C ii]-detection upper limit is <0.06 Jy km s−1(3σ), corresponding to the [C ii] luminosity of L [C II]< 5.8 × 107 L ⊙ and the [C ii]-based star formation rate of SFR[C II]<5.5 M ⊙ yr−1. Cosmological simulations suggest that only ∼10−2.5 [C ii] emitters around O i absorbers have comparable SFR to our detection limit. Although the detection in one out of six fields is reported, an order of magnitude number excess of emitters obtained from our ALMA observations supports that the contribution of massive galaxies that caused the metal enrichment cannot be ignored. Further, we also found 14 tentative galaxy candidates with a signal-to-noise ratio of ≈4.3 at large impact parameters (>50 kpc) and having larger outflow velocities within ±600 km s−1. If these detections are confirmed in the future, then the mechanism of pushing metals at larger distances with higher velocities needs to be further explored from the theoretical side.

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A [C ii] 158 μm emitter associated with an O i absorber at the end of the reionization epoch

Cited by 11 publications

References 56 publications

EIGER. I. A Large Sample of [O iii]-emitting Galaxies at 5.3 < z < 6.9 and Direct Evidence for Local Reionization by Galaxies

EIGER. I. A Large Sample of [O iii]-emitting Galaxies at 5.3 < z < 6.9 and Direct Evidence for Local Reionization by Galaxies

Compact [C ii] emitters around a C iv absorption complex at redshift 5.7

Searching for C ii Emission from the First Sample of z ∼ 6 O i Absorption-associated Galaxies with the Atacama Large Millimeter/submillimeter Array

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