Astronomy and Astrophysics, volume 514, A5-5 (2010/5-1)
Polycyclic aromatic hydrocarbon (PAH) luminous galaxies at z∼1.
TAKAGI T., OHYAMA Y., GOTO T., MATSUHARA H., OYABU S., WADA T., PEARSON C.P., LEE H.M., IM M., LEE M.G., SHIM H., HANAMI H., ISHIGAKI T., IMAI K., WHITE G.J., SERJEANT S. and MALKAN M.
Abstract (from CDS):
The NEP-deep survey, an extragalactic AKARI survey towards the north ecliptic pole (NEP), provides a comprehensive wavelength coverage from 2 to 24µm using all 9 photometric bands of the infrared camera (IRC). It allows us to photometrically identify galaxies whose mid-IR emission is clearly dominated by PAHs. We propose a single-colour selection method to identify such galaxies, using two mid-IR flux ratios at 11-to-7µm and 15-to-9µm (PAH-to-continuum flux ratio in the rest frame), which are useful for identifying starburst galaxies at z∼0.5 and 1, respectively. We perform a fitting of the spectral energy distributions (SEDs) from optical to mid-IR wavelengths, using an evolutionary starburst model with a proper treatment of radiative transfer (SBURT), in order to investigate their nature. The SBURT model reproduces observed optical-to-mid-IR SEDs of more than a half of the PAH-selected galaxies. Based on the 8µm luminosity, we find ultra luminous infrared galaxies (ULIRGs) among PAH-selected galaxies. Their PAH luminosity is higher than local ULIRGs with a similar luminosity, and the PAH-to-total IR luminosity ratio is consistent with that of less luminous starburst galaxies. They are a unique galaxy population at high redshifts, and we call these PAH-selected ULIRGs ``PAH-luminous'' galaxies. Although they are not as massive as submillimetre galaxies at z∼2, they have the stellar mass of >3x1010M☉ and therefore are moderately massive.
galaxies: starburst - infrared: galaxies - galaxies: active - galaxies : evolution
VizieR on-line data:
<Available at CDS (J/A+A/514/A5): tablea1.dat>
Table A.1: [TOG2010] NNNN N=55 among (Nos 1163-6650) = [TOG2010] JHHMMSS.ss+DDMMSS.s N=55.
Status at CDS
All or part of tables of objects could be ingested in SIMBAD with priority 2.
View the references in ADS
To bookmark this query, right click on this link: simbad:2010A&A...514A...5T and select 'bookmark this link' or equivalent in the popup menu