2025ApJ...992..191G

Query : 2025ApJ...992..191G

2025ApJ...992..191G - Astrophys. J., 992, 191 (2025/October-3)

Stacking PANCAKEZ: Spectroscopic Analysis with NIRSpec Stacks in the Epoch of Reionization. Weak Interstellar Medium Absorption and Implications for Ionizing Photon Escape at z ∼ 7.

GLAZER K.S., JONES T., CHEN Y., SANDERS R.L., BRADAC M., PAHL A.J., SHAPLEY A.E., ELLIS R.S., TOPPING M.W. and REDDY N.A.

Abstract (from CDS):

We present a spectral stacking analysis of galaxies at z ≥ 6 observed with the James Webb Space Telescope (JWST). We curate a sample of 64 galaxies spanning redshifts zspec = 6.0-9.4, which have NIRSpec medium-resolution data. The stacks achieve sufficient signal-to-noise ratios to measure equivalent widths (EWs) and velocity centroids (vcen) of low-ionization species (LIS) absorption features, transmitted Lyα emission, and nebular emission lines. Overall, we find our sample has weaker LIS absorption lines (EW(LIS) ≈ 1 Å), smaller vcen,LIS ≈ -20 ± 50 km s–1, and significantly suppressed Lyα (EW(Lyα) ≈ 5 Å), compared to similar studies undertaken at lower redshift. The weaker LIS absorption may suggest a lower covering fraction of H I and larger escape fraction of ionizing photons from our sample. Additionally, the smaller blueshifted vcen,LIS indicates less prevalent or weaker outflows in z > 6 galaxies. Stacking our subsample of Lyα emitters (LAEs), we find high EW(Hβ) ≈ 170 ± 4 Å and a detection of nebular C IV emission suggesting higher ξion in LAEs at z > 6. This work showcases the enormous potential for stacked JWST spectra revealing properties of galaxies and their diffuse interstellar medium in the epoch of reionization.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): High-redshift galaxies - Galaxies

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

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 [WDS2025] RUBIES-UDS-QG-z7 G 02 17 43.1082 -05 06 44.266           ~ 6 0

Query : 2025ApJ...992..191G

Basic data :
[WDS2025] RUBIES-UDS-QG-z7 -- Galaxy
Other object types: otypes_help 		G (2025ApJ,[WDS2025])
ICRS coord. (ep=J2000) : 		02 17 43.1082 -05 06 44.266 (Near-IR) [ ] C 2025ApJ...983...11W
FK4 coord. (ep=B1950 eq=1950) : 		02 15 12.7866 -05 20 34.099 [ ]
Gal coord. (ep=J2000) : 		169.7989369 -59.8827031 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 291193 [2998] / z(spectroscopic) 7.29 [0.01] / cz 2185487 [2998]
   (NIR) D 2025ApJ...983...11W
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Identifiers (1) :
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[WDS2025] RUBIES-UDS-QG-z7

References (6 between 1850 and 2026) (Total 6)
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