Rhythm Shimakawa , D2, SOKENDAI, Mitaka(supervisor: Tadayuki Kodama)
Rapid dust production in Hα-8μm-selected galaxies at z=2
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).
Masafusa Onoue, D1, SOKENDAI, Mitaka(supervisor: Nobunari Kashikawa)
Addressing the Evolution of Super-massive Blackholes with Hyper Suprime-Cam Survey