SIMBAD references

2017ApJ...846L...8M - Astrophys. J., 846, L8-L8 (2017/September-1)

Discovery of an H I-rich gas reservoir in the outskirts of SZ-effect-selected clusters.


Abstract (from CDS):

We report on the detection of three strong H I absorbers originating in the outskirts (i.e., impact parameter, ρcl ~(1.6-4.7)r500) of three massive (M500∼3×1014M) clusters of galaxies at redshift zcl~0.46, in the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) spectra of three background UV-bright quasars. These clusters were discovered by the 2500 deg2 South Pole Telescope Sunyaev-Zel'dovich (SZ) effect survey. All three COS spectra show a partial Lyman limit absorber with N(H i) > 1016.5 cm–2 near the photometric redshifts (| Δz/(1+z)| ~0.03) of the clusters. The compound probability of the random occurrence of all three absorbers is <0.02%, indicating that the absorbers are most likely related to the targeted clusters. We find that the outskirts of these SZ-selected clusters are remarkably rich in cool gas compared to existing observations of other clusters in the literature. The effective Doppler parameters of the Lyman series lines, obtained using a single-cloud curve-of-growth (COG) analysis, suggest a nonthermal/turbulent velocity of a fewx10 km s–1 in the absorbing gas. We emphasize the need for uniform galaxy surveys around these fields and for more UV observations of quasar-cluster pairs in general in order to improve the statistics and gain further insights into the unexplored territory of the largest collapsed cosmic structures.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: intracluster medium - galaxies: halos - intergalactic medium - quasars: absorption lines - quasars: absorption lines

Simbad objects: 12

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