NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T08:05:22 PDT
Help | Comment | NED Home

For refcode 2016PASJ...68...96M:
Retrieve 102 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Astronomical Society of Japan. 2016PASJ...68...96M Investigating the relation between CO (3-2) and far-infrared luminosities for nearby merging galaxies using ASTE Michiyama, Tomonari; Iono, Daisuke; Nakanishi, Kouichiro; Ueda, Junko; Saito, Toshiki; Ando, Misaki; Kaneko, Hiroyuki; Yamashita, Takuji; Matsuda, Yuichi; Hatsukade, Bunyo; Kikuchi, Kenichi; Komugi, Shinya; Muto, Takayuki Abstract. We present the new single-dish CO (3-2) emission data obtained toward 19 early-stage and 7 late-stage nearby merging galaxies using the Atacama Submillimeter Telescope Experiment (ASTE). Combining with the single-dish and interferometric data of galaxies observed in previous studies, we investigate the relation between the CO (3-2) luminosity (L^'}_CO(3-2)) and the far-infrared luminosity (L_FIR_) in a sample of 29 early-stage and 31 late-stage merging galaxies, and 28 nearby isolated spiral galaxies. We find that normal isolated spiral galaxies and merging galaxies have different slopes ({alpha}) in the log L^'}_CO(3-2)-log L_FIR_ plane ({alpha} ~ 0.79 for spirals and ~1.12 for mergers). The large slope ({alpha} > 1) for merging galaxies can be interpreted as evidence for increasing star formation efficiency (SFE = L_FIR/L^'}_CO(3-2)) as a function of L_FIR_. Comparing our results with sub-kpc-scale local star formation and global starburst activity in the high-z universe, we find deviations from the linear relationship in the log L^'}_CO(3-2)-log L_FIR_ plane for the late-stage mergers and high-z star-forming galaxies. Finally, we find that the average SFE gradually increases from isolated galaxies to merging galaxies and to high-z submillimeter galaxies/quasi-stellar objects. By comparing our findings with results from numerical simulations, we suggest that: (1) inefficient starbursts triggered by disk-wide dense clumps occur in the early stage of interaction, and (2) efficient starbursts triggered by central concentration of gas occur in the final stage. A systematic high spatial resolution survey of diffuse- and dense-gas tracers is the key to confirming this scenario. Key words: galaxies: evolution, galaxies: interactions, galaxies: starburst
Retrieve 102 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home