Advanced search
1 file | 1.21 MB

Blind detections of CO J=1-0 in 11 H-ATLAS galaxies at z=2.1-3.5 with the GBT/Zpectrometer

Author
Organization
Abstract
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
Keywords
galaxies: high-redshift, galaxies: evolution, galaxies: ISM, submillimeter: galaxies, SUBMILLIMETER-SELECTED GALAXIES, SCIENCE DEMONSTRATION PHASE, GREEN-BANK-TELESCOPE, DEEP-FIELD-SOUTH, SPECTRAL ENERGY-DISTRIBUTIONS, MOLECULAR GAS-RESERVOIRS, STRONGLY LENSED GALAXIES, SPITZER-SPACE-TELESCOPE, HIGH-REDSHIFT, HERSCHEL-ATLAS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.21 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Harris, AI, AJ Baker, DT Frayer, I Smail, AM Swinbank, DA Riechers, PP van der Werf, et al. 2012. “Blind Detections of CO J=1-0 in 11 H-ATLAS Galaxies at Z=2.1-3.5 with the GBT/Zpectrometer.” Astrophysical Journal 752 (2).
APA
Harris, A., Baker, A., Frayer, D., Smail, I., Swinbank, A., Riechers, D., van der Werf, P., et al. (2012). Blind detections of CO J=1-0 in 11 H-ATLAS galaxies at z=2.1-3.5 with the GBT/Zpectrometer. ASTROPHYSICAL JOURNAL, 752(2).
Vancouver
1.
Harris A, Baker A, Frayer D, Smail I, Swinbank A, Riechers D, et al. Blind detections of CO J=1-0 in 11 H-ATLAS galaxies at z=2.1-3.5 with the GBT/Zpectrometer. ASTROPHYSICAL JOURNAL. 2012;752(2).
MLA
Harris, AI, AJ Baker, DT Frayer, et al. “Blind Detections of CO J=1-0 in 11 H-ATLAS Galaxies at Z=2.1-3.5 with the GBT/Zpectrometer.” ASTROPHYSICAL JOURNAL 752.2 (2012): n. pag. Print.
@article{3001465,
  abstract     = {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 {\textlangle}= z {\textlangle}= 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},
  articleno    = {152},
  author       = {Harris, AI and Baker, AJ and Frayer, DT and Smail, I and Swinbank, AM and Riechers, DA and van der Werf, PP and Auld, R and Baes, Maarten and Bussmann, RS and Buttiglione, S and Cava, A and Clements, DL and Cooray, A and Dannerbauer, H and Dariush, A and De Zotti, G and Dunne, L and Dye, S and Eales, S and Fritz, Jacopo and Gonz{\'a}lez-Nuevo, J and Hopwood, R and Ibar, E and Ivison, RJ and Jarvis, MJ and Maddox, S and Negrello, M and Rigby, E and Smith, DJB and Temi, P and Wardlow, J},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keyword      = {galaxies: high-redshift,galaxies: evolution,galaxies: ISM,submillimeter: galaxies,SUBMILLIMETER-SELECTED GALAXIES,SCIENCE DEMONSTRATION PHASE,GREEN-BANK-TELESCOPE,DEEP-FIELD-SOUTH,SPECTRAL ENERGY-DISTRIBUTIONS,MOLECULAR GAS-RESERVOIRS,STRONGLY LENSED GALAXIES,SPITZER-SPACE-TELESCOPE,HIGH-REDSHIFT,HERSCHEL-ATLAS},
  language     = {eng},
  number       = {2},
  pages        = {14},
  title        = {Blind detections of CO J=1-0 in 11 H-ATLAS galaxies at z=2.1-3.5 with the GBT/Zpectrometer},
  url          = {http://dx.doi.org/10.1088/0004-637X/752/2/152},
  volume       = {752},
  year         = {2012},
}

Altmetric
View in Altmetric
Web of Science
Times cited: