JADES: Discovery of extremely high equivalent width Lyman-alpha emission from a faint galaxy within an ionized bubble at z = 7.3
/ Authors
A. Saxena, B. Robertson, A. Bunker, R. Endsley, A. Cameron, S. Charlot, C. Simmonds, S. Tacchella, J. Witstok, C. Willott
and 36 more authors
S. Carniani, E. Curtis-Lake, P. Ferruit, P. Jakobsen, S. Arribas, J. Chevallard, M. Curti, F. D’Eugenio, A. D. Graaff, G. Jones, T. Looser, M. Maseda, T. Rawle, H. Rix, B. R. D. Pino, R. Smit, H. Ubler, D. Eisenstein, K. Hainline, R. Hausen, B. Johnson, M. Rieke, C. Williams, C. Willmer, W. Baker, R. Bhatawdekar, R. Bowler, K. Boyett, Zuyi Chen, E. Egami, Z. Ji, E. Nelson, Michele Perna, L. Sandles, J. Scholtz, I. Shivaei
/ Abstract
We report the discovery of a remarkable Ly$\alpha$ emitting galaxy at z = 7.2782, JADES-GS-z7-LA, with EW$_0$(Ly$\alpha$) $= 388.0 \pm 88.8$\AA and UV magnitude -17.0. The spectroscopic redshift is confirmed via rest-frame optical lines [O II], H$\beta$ and [O III] in its JWST/NIRSpec Micro-Shutter Assembly (MSA) spectrum. The Ly$\alpha$ line is detected in both lower resolution PRISM as well as medium resolution G140M grating spectra. The LSF-deconvolved Ly$\alpha$ FWHM in the grating is $383.9 \pm 56.2$ km/s and the Ly$\alpha$ velocity offset compared to the systemic redshift is $113.3 \pm 80.0$ km/s, indicative of very little neutral gas or dust within the galaxy. We estimate the Ly$\alpha$ escape fraction to be>70%. JADES-GS-z7-LA has a O32 ratio of $11.1 \pm 2.2$ and a R23 ratio of $11.2 \pm 2.6$, consistent with low metallicity and high ionization parameters. Deep NIRCam imaging also revealed a close companion source (separated by 0.23"), which exhibits similar photometry to that of JADES-GS-z7-LA, with a photometric excess in the F410M NIRCam image consistent with [O III]+H$\beta$ emission at the same redshift. The spectral energy distribution of JADES-GS-z7-LA indicates a"bursty"star formation history, with a low stellar mass of $\approx 10^7$ $M_\odot$. Assuming that the Ly$\alpha$ transmission through the intergalactic medium is the same as its measured escape fraction, an ionized region of size>1.5 pMpc is needed to explain the high Ly$\alpha$ EW and low velocity offset compared to systemic seen in JADES-GS-z7-LA. Owing to its UV-faintness, we show that it is incapable of single-handedly ionizing a region large enough to explain its Ly$\alpha$ emission. Therefore, we suggest that JADES-GS-z7-LA (and possibly the companion source) may be a part of a larger overdensity, presenting direct evidence of overlapping ionized bubbles at $z>7$.
Journal: Astronomy & Astrophysics