Astrophys. J., 891, 177-177 (2020/March-2)
CHORUS. III. Photometric and spectroscopic properties of Lyα blobs at z = 4.9-7.0.
ZHANG H., OUCHI M., ITOH R., SHIBUYA T., ONO Y., HARIKANE Y., INOUE A.K., RAUCH M., KIKUCHIHARA S., NAKAJIMA K., YAJIMA H., ARATA S., ABE M., IWATA I., KASHIKAWA N., KAWANOMOTO S., KIKUTA S., KOBAYASHI M.A.R., KUSAKABE H., MAWATARI K., NAGAO T., SHIMASAKU K. and TANIGUCHI Y.
Abstract (from CDS):
We report the Subaru Hyper Suprime-Cam (HSC) discovery of two Lyα blobs (LABs), dubbed z70-1 and z49-1 at z = 6.965 and z = 4.888, respectively, that are Lyα emitters with a bright (logLLyα/[erg s–1]> 43.4) and spatially extended Lyα emission, and present the photometric and spectroscopic properties of a total of seven LABs: the two new LABs and five previously known LABs at z = 5.7-6.6. The z70-1 LAB shows extended Lyα emission with a scale length of 1.4 ± 0.2 kpc, about three times larger than the UV continuum emission, making z70-1 the most distant LAB identified to date. All of the seven LABs, except z49-1, exhibit no active galactic nucleus (AGN) signatures such as X-ray emission, N V λ1240 emission, or Lyα line broadening, while z49-1 has a strong C IV λ1548 emission line indicating an AGN on the basis of the UV-line ratio diagnostics. We carefully model the point-spread functions of the HSC images and conduct two-component exponential profile fitting to the extended Lyα emission of the LABs. The Lyα scale lengths of the core (star-forming region) and halo components are rc = 0.6-1.2 kpc and rh = 2.0-13.8 kpc, respectively. The relations between the scale lengths and galaxy properties (Lyα luminosity LLyα, Lyα rest-frame equivalent width EW0, and UV continuum magnitude MUV) of our LABs are similar to those of Lyα halos (LAHs) identified around star-forming galaxies found previously by the Very Large Telescope/MUSE at similar redshifts, suggesting that our LABs are likely the bright version of high-z LAHs.
© 2020. The American Astronomical Society. All rights reserved.
Galaxy formation - Galaxy evolution - High-redshift galaxies - Observational cosmology
Status at CDS:
Examining the need for a new acronym.
View the reference in ADS
To bookmark this query, right click on this link: simbad:2020ApJ...891..177Z and select 'bookmark this link' or equivalent in the popup menu