Title:
AKARI extragalactic survey towards the north ecliptic pole: Study of MIR spectral energy distributions of distant infrared galaxies
Author(s):
T.Takagi, H.Matsuhara, T.Wada, S.Oyabu, Y.Ohyama, T.Goto, H.Hanami, H.M.Lee, M.Im, S.Serjeant, G.White
Abstract:
Large area surveys in the infrared wavelengths have revealed a significant evolution of the star formation activity of the universe in the past. The extragalactic survey we have conduced with AKARI towards the north ecliptic pole (NEP) is unique, in terms of a comprehensive wavelength coverage from 2 to 24 micron using all 9 photometric bands of the Infrared Camera (IRC). This includes new wavelength windows for extragalactic surveys, such as 18 micron. We demonstrate that this IRC all-band photometry is capable of tracing a steep rise in the flux at the blue side of the polycyclic aromatic hydrocarbon (PAH) 6.2 micron emission feature of infrared luminous galaxies at z< 1. This indicates that we can estimate PAH luminosity from photometric observations, and identify most luminous starburst galaxies at z<1. Using KeckII/DEIMOS, we conducted spectroscopic follow-up survey of MIR-detected galaxies. We discuss the results of correlations between optical spectral properties and mid-infrared properties.