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• W3100393456 endingPage "171" @default.
• W3100393456 startingPage "171" @default.
• W3100393456 abstract "We combine observations from the Atacama Large Millimeter/submillimeter Array (ALMA) and the NOrthern Extended Millimeter Array (NOEMA) to assess the redshift and to study the star formation conditions in AzTEC2: one of the brightest sub-millimeter galaxies (SMGs) in the COSMOS field ($S_{rm 1.1mm}=10.5pm1.4$mJy). Our high-resolution observations confirm that AzTEC2 splits into two components (namely AzTEC2-A and AzTEC2-B) for which we detect [C$,$II] and $^{12}$CO(5$to$4) line emission, implying a redshift of $4.626pm0.001$ ($4.633pm0.001$) for AzTEC2-A (AzTEC2-B) and ruling out previous associations with a galaxy at $zsim1$. We use the $^{12}$CO(5$to$4) line emission and adopt typical SMG-like gas excitation conditions to estimate the molecular gas mass, which is $M_{rm gas}(alpha_{rm CO}/2.5)=2.1pm0.4 times10^{11}{rm M}_odot$ for AzTEC2-A, and a factor four lower for AzTEC2-B. With the infrared-derived star formation rate of AzTEC2-A ($1920pm100 ,M_odot{rm , yr}^{-1}$) and AzTEC2-B ($710pm 35,M_odot{rm ,yr}^{-1}$), they both will consume their current gas reservoir within $(30-200),$Myr. We find evidence of a rotation-dominated [C$,$II] disk in AzTEC2-A, with a de-projected rotational velocity of $v_{rm rot}(i=39^circ)=660pm130{rm ,km,s}^{-1}$, velocity dispersion $lesssim100{rm ,km,s}^{-1}$, and dynamical mass of $M_{rm dyn}(i=39^circ)=2.6^{+1.2}_{-0.9}times10^{11},M_odot$. We propose that an elevated gas accretion rate from the cosmic web might be the main driver of the intense levels of star formation in AzTEC2-A, which might be further enhanced by gravitational torques induced by its minor companion (AzTEC2-B). These results strengthen the picture whereby the population of single-dish selected SMGs is rather heterogeneous, including a population of pairs of massive, highly-active galaxies in a pre-coalescence phase." @default.
• W3100393456 created "2020-11-23" @default.
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• W3100393456 date "2020-02-26" @default.
• W3100393456 modified "2023-10-16" @default.
• W3100393456 title "The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at <i>z</i> = 4.63" @default.
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