English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present results of the cross-correlation Ly$\alpha$ intensity mapping withSubaru/Hyper Suprime-Cam (HSC) ultra-deep narrowband images and Ly$\alpha$emitters (LAEs) at $z=5.7$ and $6.6$ in a total area of $4$ deg$^2$. Althoughoverwhelming amount of data quality controls have been performed for thenarrowband images, we further conduct extensive analysis evaluating systematicsof large-scale point-spread-function wings, sky subtractions, and unknownerrors based on physically uncorrelated signals and sources found in real HSCimages and object catalogs, respectively. Removing the systematics, wecarefully calculate cross-correlations between Ly$\alpha$ intensity of thenarrowband images and the LAEs. We tentatively identify very diffuse Ly$\alpha$emission with the $\simeq 3\sigma$ ($\simeq 2\sigma$) significance at $\gtrsim$100 comoving kpc (ckpc) far from the LAEs at $z=5.7$ ($6.6$), around andprobably even beyond a virial radius of star-forming galaxies with$M_\mathrm{h}\sim10^{11}M_\odot$. The diffuse Ly$\alpha$ emission possiblyextends up to $1$,$000$ ckpc with the surface brightness of$10^{-20}$-$10^{-19}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$. We confirm that thesmall-scale ($<150$ ckpc) Ly$\alpha$ radial profiles of LAEs are consistentwith those obtained by recent MUSE observations. Comparisons with numericalsimulations suggest that the large-scale ($\sim150$-$1$,$000$ ckpc) Ly$\alpha$emission are not explained by unresolved faint neighboring galaxies includingsatellites, but by a combination of Ly$\alpha$ photons emitted from the centralLAE and other unknown sources, such as cold-gas streams and galactic outflow.We find no evolution in the Ly$\alpha$ radial profiles of our LAEs from $z=5.7$to $6.6$, where theoretical models predict a flattening of the profile slopemade by cosmic reionization, albeit with our moderately large observationalerrors.

astrophysical journal/the astrophysical journal

SILVERRUSH. IX. Lya Intensity Mapping with Star-Forming Galaxies at  z=5.7 and 6.6: A Possible Detection of Extended Lya Emission at $\gtrsim$100  comoving kpc around and beyond the Virial-Radius Scale of Galaxy Dark Matter  Halos