Direct evidence for Ly\${\textbackslash}alpha\$ depletion in the protocluster core. Shimakawa, R., Kodama, T., Hayashi, M., Tanaka, I., Matsuda, Y., Kashikawa, N., Shibuya, T., Tadaki, K., Koyama, Y., Suzuki, T. L., & Yamamoto, M. Monthly Notices of the Royal Astronomical Society: Letters, 468(1):L21–L25, June, 2017. arXiv: 1702.00100
Direct evidence for Ly\${\textbackslash}alpha\$ depletion in the protocluster core [link]Paper  doi  abstract   bibtex   
We have carried out a panoramic Ly\${\textbackslash}alpha\$ narrowband imaging with Suprime-Cam on Subaru towards the known protocluster USS1558–003 at \$z=2.53\$. Our previous narrowband imaging at near-infrared has identified multiple dense groups of H\${\textbackslash}alpha\$ emitters (HAEs) within the protocluster. We have now identified the large-scale structures across a \${\textbackslash}sim\$50 comoving Mpc scale traced by Ly\${\textbackslash}alpha\$ emitters (LAEs) in which the protocluster traced by the HAEs is embedded. On a smaller scale, however, there are remarkably few LAEs in the regions of HAE overdensities. Moreover, the stacking analyses of the images show that HAEs in higher-density regions show systematically lower escape fractions of Ly\${\textbackslash}alpha\$ photons than those of HAEs in lower-density regions. These phenomena may be driven by the extra depletion of Ly\${\textbackslash}alpha\$ emission lines along our line of sight by more intervening cold circumgalactic/intergalactic medium and/or dust existing in the dense core. We also caution that all the past high-\$z\$ protocluster surveys using LAEs as the tracers would have largely missed galaxies in the very dense cores of the protoclusters where we would expect to see any early environmental effects.
@article{shimakawa_direct_2017,
	title = {Direct evidence for {Ly}\${\textbackslash}alpha\$ depletion in the protocluster core},
	volume = {468},
	issn = {1745-3925, 1745-3933},
	url = {http://arxiv.org/abs/1702.00100},
	doi = {10.1093/mnrasl/slx019},
	abstract = {We have carried out a panoramic Ly\${\textbackslash}alpha\$ narrowband imaging with Suprime-Cam on Subaru towards the known protocluster USS1558--003 at \$z=2.53\$. Our previous narrowband imaging at near-infrared has identified multiple dense groups of H\${\textbackslash}alpha\$ emitters (HAEs) within the protocluster. We have now identified the large-scale structures across a \${\textbackslash}sim\$50 comoving Mpc scale traced by Ly\${\textbackslash}alpha\$ emitters (LAEs) in which the protocluster traced by the HAEs is embedded. On a smaller scale, however, there are remarkably few LAEs in the regions of HAE overdensities. Moreover, the stacking analyses of the images show that HAEs in higher-density regions show systematically lower escape fractions of Ly\${\textbackslash}alpha\$ photons than those of HAEs in lower-density regions. These phenomena may be driven by the extra depletion of Ly\${\textbackslash}alpha\$ emission lines along our line of sight by more intervening cold circumgalactic/intergalactic medium and/or dust existing in the dense core. We also caution that all the past high-\$z\$ protocluster surveys using LAEs as the tracers would have largely missed galaxies in the very dense cores of the protoclusters where we would expect to see any early environmental effects.},
	number = {1},
	journal = {Monthly Notices of the Royal Astronomical Society: Letters},
	author = {Shimakawa, Rhythm and Kodama, Tadayuki and Hayashi, Masao and Tanaka, Ichi and Matsuda, Yuichi and Kashikawa, Nobunari and Shibuya, Takatoshi and Tadaki, Ken-ichi and Koyama, Yusei and Suzuki, Tomoko L. and Yamamoto, Moegi},
	month = jun,
	year = {2017},
	note = {arXiv: 1702.00100},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {L21--L25},
}

Downloads: 0