Blind detections of CO J=1-0 IN 11 H-ATLAS Galaxies at z=2.1-3.5 with the GBT/Zpectrometer
We report measurements of the carbon monoxide ground state rotational transition ((CO)-C-12-O-16 J = 1-0) with the Zpectrometer ultrawideband spectrometer on the 100 m diameter Green Bank Telescope. The sample comprises 11 galaxies with redshifts between z = 2.1 and 3.5 from a total sample of 24 targets identified by Herschel-ATLAS photometric colors from the SPIRE instrument. Nine of the CO measurements are new redshift determinations, substantially adding to the number of detections of galaxies with rest-frame peak submillimeter emission near 100 mu m. The CO detections confirm the existence of massive gas reservoirs within these luminous dusty star-forming galaxies (DSFGs). The CO redshift distribution of the 350 mu m selected galaxies is strikingly similar to the optical redshifts of 850 mu m-selected submillimeter galaxies in 2.1 <= z <= 3.5. Spectroscopic redshifts break a temperature-redshift degeneracy; optically thin dust models fit to the far-infrared photometry indicate characteristic dust temperatures near 34 K for most of the galaxies we detect in CO. Detections of two warmer galaxies, and statistically significant nondetections, hint at warmer or molecule-poor DSFGs with redshifts that are difficult to determine from Herschel-SPIRE photometric colors alone. Many of the galaxies identified by H-ATLAS photometry are expected to be amplified by foreground gravitational lenses. Analysis of CO linewidths and luminosities provides a method for finding approximate gravitational lens magnifications mu from spectroscopic data alone, yielding mu similar to 3-20. Corrected for magnification, most galaxy luminosities are consistent with an ultraluminous infrared galaxy classification, but three are candidate hyper-LIRGs with luminosities greater than 10(13) L-circle dot
Item Type | Article |
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Date Deposited | 26 Jul 2024 11:35 |
Last Modified | 26 Jul 2024 11:35 |
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Read more research from the creator(s):
- Harris, A.I.
- Baker, A. J.
- Frayer, D. T.
- Smail, Ian
- Swinbank, A.M.
- Riechers, D. A.
- van der Werf, P. P.
- Auld, R.
- Baes, M.
- Bussmann, R. S.
- Buttiglione, S.
- Cava, A.
- Clements, D. L.
- Cooray, A.
- Dannerbauer, H.
- Dariush, A.
- De Zotti, G.
- Dunne, L.
- Dye, S.
- Eales, S.
- Fritz, J.
- Gonzalez-Nuevo, J.
- Hopwood, R.
- Ibar, E.
- Ivison, R. J.
- Jarvis, M.J.
- Maddox, S.
- Negrello, M.
- Rigby, E.
- Smith, Daniel
- Temi, P.
- Wardlow, J.
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