Far-infrared luminosity function of local star-forming galaxies in the AKARI Deep Field-South

Abstract

We present a far‐infrared galaxy luminosity function for the local universe. We have obtained 389 spectroscopic redshifts for galaxies observed at 90 μm in the AKARI Deep Field‐South, using the AAOmega fibre spectrograph via optical identifications in the digitized sky survey and 4‐m class optical imaging. For the luminosity function presented in this paper, we have used those galaxies which have redshifts 0 < z < 0.25, have optical magnitudes and are not part of a newly discovered cluster of galaxies (giving a total of 130 sources). Infrared and optical completeness functions were estimated using earlier Spitzer data and automated plate measurement (APM) B‐band optical data, respectively, and the luminosity function has been prepared using the 1/Vmax method. We also separate the luminosity function between galaxies which show evidence of predominantly star‐forming activity and predominantly active galactic nucleus (AGN) activity in their optical spectra. Our luminosity function is in good agreement with the previous 90‐μm luminosity function from the European Large Area Infrared Space Observatory (ISO) Survey, and we also present a luminosity function with combined AKARI and ISO data. The result is in reasonable agreement with predictions based on the earlier Infrared Astronomical Satellite (IRAS) m PSCz catalogue, and with a recent backward evolution model.

Dusty star-forming galaxies at high redshift

“…insufficient to detect high-z unlensed galaxies) but conducted a few deep field pointings, including the AKARI deep field South (ADF-S) covering ∼12 deg 2 . The ADF-S hosts several tens of bright 90µm galaxies (the 90µm channel being the most sensitive) yet to be characterized in detail; a number of spectroscopic redshifts for the galaxies have been compiled in Sedgwick et al (2011). The AKARI observatory also hosted the InfraRed Camera (IRC; Onaka et al, 2007) operated at shorter wavelengths, from 2.4-24µm, yet was not focused on deep-field extragalactic work as Spitzer IRAC and MIPS fulfilled that role.…”

Optical Survey With Kmtnet for Dusty Star-Forming Galaxies in the Akari Deep Field South

“…The central part of the ADF-S (inside KMTNet-R2 region in Figure 1) Oliver et al (2012) was also observed by AKARI /IRC, APEX/LABOCA, ASTE/AzTEC and ATCA at 2-24µm, 870µm, 1.1mm and 20cm, respectively. Optical spectroscopic information is available only in this region (Sedgwick et al 2011). Other follow-up multi-wavelength surveys for the central region of the ADF-S are described in Clements (2012).…”

Far Infrared Galaxies in Akari's Eye

“…errors: it can also be real, since our sample of z spec is strongly biased towards low redshifts by the selection made by the observers (Sedgwick et al, 2011). The median value of z CIGALE is closer to those of z spec and equal to 0.06.…”

“…Some of them were collected from public databases (NED and SIMBAD). Additionally, we use redshift measurements of Sedgwick et al (2011).…”