Kavli Affiliate: John D. Silverman
| First 5 Authors: Shenli Tang, John D. Silverman, Zhaoxuan Liu, Manda Banerji, Tomoko Suzuki
| Summary:
We present a study of the molecular gas in five closely-spaced
($R_{perp}<20$ kpc) dual quasars ($L_{rm
bol}gtrsim10^{44}~mathrm{erg~s}^{-1}$) at redshifts $0.4<z<0.8$ with the
Atacama Large Millimeter/submillimeter Array. The dual quasar phase represents
a distinctive stage during the interaction between two galaxies for
investigating quasar fueling and feedback effects on the gas reservoir. The
dual quasars were selected from the Sloan Digital Sky Survey and Subaru/Hyper
Suprime-Cam Subaru Strategic Program, with confirmatory spectroscopic
validation. Based on the detection of the CO J=2–1 emission line with Band 4,
we derived key properties including CO luminosities, line widths, and molecular
gas masses for these systems. Among the ten quasars of the five pairs, eight
have line detections exceeding $5sigma$. The detected sources prominently
harbor substantial molecular gas reservoirs, with molecular gas masses
($M_{text{molgas}}$) between $10^{9.6-10.5}~mathrm{M_{odot}}$, and molecular
gas-to-stellar mass ratios ($mu_{text{molgas}}$) spanning $18-97%$. The
overall $mu_{text{molgas}}$ of these dual quasars agrees with that of
inactive star-forming main-sequence galaxies at comparable redshifts,
indicating no clear evidence of quenching. However, intriguing features in each
individual system show possible evidence of AGN feedback, matter transfer, and
compaction processes.
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