Dense Gas in Local Galaxies Revealed by Multiple Tracers
MNRAS 000,1–18 (2020) Preprint 9 March 2021 Compiled using MNRAS LATEX style file v3.0 Dense gas in local galaxies revealed by multiple tracers Fei Li1, Junzhi Wang1,2¢, Feng Gao3, Shu Liu4, Zhi-Yu Zhang5, Shanghuo Li1,6 Yan Gong7, Juan Li1,2 and Yong Shi5 1Shanghai Astronomical Observatory, Chinese Academy of Sciences,80 Nandan Road, Shanghai, 200030, China 2Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing, JiangSu 210033, China 3Max-Planck-Institut für Extraterrestrische Physik, Gießenbachstrasse 1, D-85741 Garching bei München, Germany 4CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 5School of Astronomy and Space Science, Nanjing University, Nanjing, 210093, China 6Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 7Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany Accepted XXX. Received YYY; in original form ZZZ ABSTRACT We present 3 mm and 2 mm band simultaneously spectroscopic observations of HCN 1- 0, HCO¸ 1-0, HNC 1-0, and CS 3-2 with the IRAM 30 meter telescope, toward a sample 5 of 70 sources as nearby galaxies with infrared luminosities ranging from several 10 ! to 12 ¸ more than 10 ! . After combining HCN 1-0, HCO 1-0 and HNC 1-0 data from literature with our detections, relations between luminosities of dense gas tracers (HCN 1-0, HCO¸ 1-0 and HNC 1-0) and infrared luminosities are derived, with tight linear correlations for all tracers. Luminosities of CS 3-2 with only our observations also show tight linear correlation with infrared luminosities.
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