[Speaker 1]
Rhythm Shimakawa , D2, SOKENDAI, Mitaka(supervisor: Tadayuki Kodama)
[Title]
Rapid dust production in Hα-8μm-selected galaxies at z=2
[Abstract]
I present results on the dust obscuration of star-burst galaxies at z=2 selected by MIPS/Spitzer and MOIRCS/Subaru, towards on-going programs with ALMA. Thanks to our past narrow-band imaging survey (Mahalo-Subaru), we have a large sample of Hα-selected star-forming galaxies. By combining them with MIPS 24um data, we probed ~50 dusty galaxies with IR luminosities above 5E11 Lsun. Since those also have spatially-resolved rest-UV image taken by Hubble Space Telescope, we can study morphological dependence of dust properties (IRX=IR/UV). Our preliminary results show that for a given UV slope, “UV-saturated” galaxies have more heavily-obscured UV structures, which directly indicates that dust covering fraction increase rapidly than intrinsic UV luminosity as suggested by Reddy et al. 2010. Moreover, such highly-obscured galaxies tend to have high equivalent widths of Hα emission, which is also good agreement with dust properties of massive galaxies at low redshift (Koyama et al. 2015).

[Speaker 2]
Masafusa Onoue, D1, SOKENDAI, Mitaka(supervisor: Nobunari Kashikawa)
[Title]
Addressing the Evolution of Super-massive Blackholes with Hyper Suprime-Cam Survey