Mon. Not. R. Astron. Soc., 474, 3866-3874 (2018/March-1)
Total molecular gas masses of Planck - Herschel selected strongly lensed hyper luminous infrared galaxies.
HARRINGTON K.C., YUN M.S., MAGNELLI B., FRAYER D.T., KARIM A., WEISS A., RIECHERS D., JIMENEZ-ANDRADE E.F., BERMAN D., LOWENTHAL J. and BERTOLDI F.
Abstract (from CDS):
We report the detection of CO(1-0) line emission from seven Planck and Herschel selected hyper luminous (L_ IR (8 -1000µm)_ > 1013 L☉ ) infrared galaxies with the Green Bank Telescope (GBT). CO(1-0) measurements are a vital tool to trace the bulk molecular gas mass across all redshifts. Our results place tight constraints on the total gas content of these most apparently luminous high-z star-forming galaxies (apparent IR luminosities of LIR > 10^13 - 14^ L☉), while we confirm their predetermined redshifts measured using the Large Millimeter Telescope, LMT (zCO = 1.33-3.26). The CO(1-0) lines show similar profiles as compared to Jup = 2-4 transitions previously observed with the LMT. We report enhanced infrared to CO line luminosity ratios of <L_ IR_/ L^′^_ CO(1 -0)_ > = 110 ±22 L☉ (K km s–1 pc–2)–1 compared to normal star-forming galaxies, yet similar to those of well-studied IR-luminous galaxies at high-z. We find average brightness temperature ratios of < r21> = 0.93 (2 sources), < r31> = 0.34 (5 sources), and < r41> = 0.18 (1 source). The r31 and r41 values are roughly half the average values for SMGs. We estimate the total gas mass content as µMH2 = (0.9 -27.2) ×1011 (α_ CO_/0.8) M☉, where µ is the magnification factor and αCO is the CO line luminosity to molecular hydrogen gas mass conversion factor. The rapid gas depletion times, <τ_ depl_ >= 80 Myr, reveal vigorous starburst activity, and contrast the Gyr depletion time-scales observed in local, normal star-forming galaxies.
© 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: high-redshift - galaxies: ISM - galaxies: starburst
View the references in ADS
To bookmark this query, right click on this link: simbad:2018MNRAS.474.3866H and select 'bookmark this link' or equivalent in the popup menu