Nobeyama 45-m CO J=1-0 Observations of Luminous Type 1 AGNs at $z\approx0.3$

Tomonari Michiyama; Ming-Yang Zhuang; Jinyi Shangguan; Hassen M. Yesuf; Hiroyuki Kaneko; Luis C. Ho

doi:10.1093/pasj/psad039

paper

Nobeyama 45-m CO J=1-0 Observations of Luminous Type 1 AGNs at $z \approx 0.3$

arXiv:2306.00411 · doi:10.1093/pasj/psad039

Abstract

We have performed CO J =1-0 observations of ten galaxies hosting luminous ( $L_{bol} > 1 0^{46} erg s^{- 1}$ ) type 1 active galactic nuclei (AGNs) with the Nobeyama 45-m radio telescope. The targets are selected because they are expected to be rich in molecular gas based on their high nebular dust extinction ( $A_{V}$ ). However, no significant CO emission lines were detected in any of the targets. The upper limits of the CO J=1-0 luminosities are lower than expected given the molecular gas mass inferred from the nebular $A_{V}$ . This inconsistency may be due to overestimated $A_{V}$ values due to the lack of stellar absorption correction. Considering more reliable $A_{V}$ values, the CO J=1-0 non-detections by Nobeyama 45-m are natural. This suggests that our results do not contradict the conversion methods from $A_{V}$ to molecular gas mass proposed in the literature. This survey suggests that careful $A_{V}$ measurements as well as CO observations are still needed to improve the measurements or estimates of the molecular gas content of galaxies hosting luminous AGNs.

arXiv comment8 pages, 6 figures, Accepted for publication in PASJ

Nobeyama 45-m CO J=1-0 Observations of Luminous Type 1 AGNs at z≈0.3

Abstract

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Nobeyama 45-m CO J=1-0 Observations of Luminous Type 1 AGNs at $z \approx 0.3$