%0 Generic %1 kakuma2019silverrush %A Kakuma, Ryota %A Ouchi, Masami %A Harikane, Yuichi %A Inoue, Akio K %A Komiyama, Yutaka %A Kusakabe, Haruka %A Liu, Chien-Hsiu %A Matsuda, Yuichi %A Matsuoka, Yoshiki %A Mawatari, Ken %A Momose, Rieko %A Ono, Yoshiaki %A Shibuya, Takatoshi %A Taniguchi, Yoshiaki %D 2019 %K library %T SILVERRUSH. IX. Ly$\alpha$ Intensity Mapping with Star-Forming Galaxies at $z=5.7$ and $6.6$: Ly$\alpha$ Emission Extended at $>150$ comoving kpc Beyond the Virial-Radius Scale of Galaxy Dark Matter Halos %U http://arxiv.org/abs/1906.00173 %X We present results of the cross-correlation Lya intensity mapping with Subaru/Hyper Suprime-Cam (HSC) ultra-deep narrowband images and Lya emitters (LAEs) at $z=5.7$ and $6.6$ in a total area of $4$ deg$^2$. Although overwhelming amount of data quality controls have been performed for the narrowband images and the LAE samples, we further conduct extensive analysis evaluating systematics of large-scale point spread function wings, sky subtractions, and unknown errors on the basis of physically uncorrelated signals and sources found in real HSC images and object catalogs, respectively. Removing the systematics, we carefully calculate cross-correlations between Lya intensity of the narrowband images and the LAEs. We identify very diffuse Lya emission with the $3\sigma$ ($2\sigma$) significance at $>150$ comoving kpc (ckpc) far from the LAEs at $z = 5.7$ ($6.6$), beyond a virial radius of star-forming galaxies with $M_h 10^11 M_ødot$. The diffuse Lya emission possibly extends up to $1,000$ ckpc with the surface brightness of $10^-20-10^-19$ erg s$^-1$ cm$^-2$ arcsec$^-2$. We confirm that the small-scale ($<150$ ckpc) Lya radial profiles of LAEs in our Lya intensity maps are consistent with those obtained by recent MUSE observations (Leclercq et al. 2017). Comparisons with numerical simulations suggest that the large-scale ($150-1,000$ ckpc) Lya emission are not explained by unresolved faint sources of neighboring galaxies including satellites, but by a combination of Lya photons emitted from the central LAE and other unknown sources, such as a cold-gas stream and galactic outflow. We find no evolution in the Lya radial profiles of our LAEs from $z=5.7$ to $6.6$, where theoretical models predict a flattening of the profile slope made by cosmic reionization, albeit with our moderately large observational errors.

@misc{kakuma2019silverrush, abstract = {We present results of the cross-correlation Lya intensity mapping with Subaru/Hyper Suprime-Cam (HSC) ultra-deep narrowband images and Lya emitters (LAEs) at $z=5.7$ and $6.6$ in a total area of $4$ deg$^2$. Although overwhelming amount of data quality controls have been performed for the narrowband images and the LAE samples, we further conduct extensive analysis evaluating systematics of large-scale point spread function wings, sky subtractions, and unknown errors on the basis of physically uncorrelated signals and sources found in real HSC images and object catalogs, respectively. Removing the systematics, we carefully calculate cross-correlations between Lya intensity of the narrowband images and the LAEs. We identify very diffuse Lya emission with the $3\sigma$ ($2\sigma$) significance at $>150$ comoving kpc (ckpc) far from the LAEs at $z = 5.7$ ($6.6$), beyond a virial radius of star-forming galaxies with $M_\mathrm{h} \sim 10^{11} M_\odot$. The diffuse Lya emission possibly extends up to $1,000$ ckpc with the surface brightness of $10^{-20}-10^{-19}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$. We confirm that the small-scale ($<150$ ckpc) Lya radial profiles of LAEs in our Lya intensity maps are consistent with those obtained by recent MUSE observations (Leclercq et al. 2017). Comparisons with numerical simulations suggest that the large-scale ($\sim 150-1,000$ ckpc) Lya emission are not explained by unresolved faint sources of neighboring galaxies including satellites, but by a combination of Lya photons emitted from the central LAE and other unknown sources, such as a cold-gas stream and galactic outflow. We find no evolution in the Lya radial profiles of our LAEs from $z=5.7$ to $6.6$, where theoretical models predict a flattening of the profile slope made by cosmic reionization, albeit with our moderately large observational errors.}, added-at = {2019-06-04T03:40:36.000+0200}, author = {Kakuma, Ryota and Ouchi, Masami and Harikane, Yuichi and Inoue, Akio K and Komiyama, Yutaka and Kusakabe, Haruka and Liu, Chien-Hsiu and Matsuda, Yuichi and Matsuoka, Yoshiki and Mawatari, Ken and Momose, Rieko and Ono, Yoshiaki and Shibuya, Takatoshi and Taniguchi, Yoshiaki}, biburl = {https://www.bibsonomy.org/bibtex/2f070658c00283f1a11b1853a825b0195/gpkulkarni}, description = {SILVERRUSH. IX. Ly$\alpha$ Intensity Mapping with Star-Forming Galaxies at $z=5.7$ and $6.6$: Ly$\alpha$ Emission Extended at $>150$ comoving kpc Beyond the Virial-Radius Scale of Galaxy Dark Matter Halos}, interhash = {09ea1ac2acb232eda63f9eab6c590cb9}, intrahash = {f070658c00283f1a11b1853a825b0195}, keywords = {library}, note = {cite arxiv:1906.00173}, timestamp = {2019-06-04T03:40:36.000+0200}, title = {SILVERRUSH. IX. Ly$\alpha$ Intensity Mapping with Star-Forming Galaxies at $z=5.7$ and $6.6$: Ly$\alpha$ Emission Extended at $>150$ comoving kpc Beyond the Virial-Radius Scale of Galaxy Dark Matter Halos}, url = {http://arxiv.org/abs/1906.00173}, year = 2019 }