Selection of ULIRGs in infrared and submm surveys

摘要: We examine the selection characteristics of infrared and submm surveys with IRAS, Spitzer, BLAST, Herschel SCUBA, identify range dust temperatures these are sensitive to, for galaxies in ultraluminous IR galaxy (ULIRG) luminosity [12 < log (L_IR/L_sun) 13], between z= 0 4. find that extent redshift over which unbiased is a function wavelength selection, flux density limit ULIRG luminosity. Short (λ≲ 200 μm) Spitzer/MIPS Herschel/PACS to all spectral energy distribution (SED) types large temperature interval (17–87 K), substantial fraction their accessible range. On other hand, long (λ≳ Herschel/SPIRE SCUBA significantly more cold ULIRGs, disfavouring warmer SEDs even at low redshifts. In order evaluate observations context survey effects, we four samples from Spitzer/MIPS, BLAST SCUBA. lack ULIRGs local (z≤ 0.1) Universe not consequence seen locally only subset much larger exists high redshift. demonstrate luminosity–temperature (L–T) relation, indicates luminous sources also hotter, applicable distant when extrapolated regime, because scatter observed too large. Finally, show difference distributions result becoming colder due an L–T relation evolves as Instead, they consistent picture where evolution dependent, i.e. evolve faster rate than warm counterparts.