• DOI:10.3847/1538-4357/aa74c2
• Corpus ID: 119463004

A Radio-to-mm Census of Star-forming Galaxies in Protocluster 4C23.56 at Z = 2.5: Gas Mass and Its Fraction Revealed with ALMA

@article{Lee2017ARC,
  title={A Radio-to-mm Census of Star-forming Galaxies in Protocluster 4C23.56 at Z = 2.5: Gas Mass and Its Fraction Revealed with ALMA},
  author={Minju M. Lee and Ichi Tanaka and Ryohei Kawabe and Kotaro Kohno and Tadayuki Kodama and Masaru Kajisawa and Min Su Yun and Kouichiro Nakanishi and Daisuke Iono and Yoichi Tamura and Bunyo Hatsukade and Hideki Umehata and Toshiki Saito and Takuma Izumi and Itziar Aretxaga and Ken-ichi Tadaki and Milagros Zeballos and Soh Ikarashi and Grant W. Wilson and David H. Hughes and Robert J. Ivison},
  journal={The Astrophysical Journal},
  year={2017},
  volume={842}
}

• Minju M. Lee, I. Tanaka, +18 authors R. Ivison
• Published 29 May 2017
• Physics
• The Astrophysical Journal

We investigate gas contents of star-forming galaxies associated with protocluster 4C23.56 at z = 2.49 by using the redshifted CO (3–2) and 1.1 mm dust continuum with the Atacama Large Millimeter/submillimeter Array. The observations unveil seven CO detections out of 22 targeted Hα emitters (HAEs) and four out of 19 in 1.1 mm dust continuum. They have high stellar mass ( M⊙) and exhibit a specific star-formation rate typical of main-sequence star-forming galaxies at . Different gas-mass estimators from CO (3–2) and 1.1 mm yield consistent values for simultaneous detections. The gas mass ( ) and gas fraction ( ) are comparable to those of field galaxies, with )) , where is the CO-to-H2 conversion factor and A(Z) is the additional correction factor for the metallicity dependence of , and from CO (3–2). Our measurements place a constraint on the cosmic gas density of high-z protoclusters, indicating that the protocluster is characterized by a gas density higher than that of the general fields by an order of magnitude. We found with the CO(3–2) detections. The five ALMA CO detections occur in the region of highest galaxy surface density, where the density positively correlates with global star-forming efficiency (SFE) and stellar mass. Such correlations possibly indicate a critical role of the environment on early galaxy evolution at high-z protoclusters, though future observations are necessary for confirmation.