LoTSS Jellyfish Galaxies. IV. Enhanced Star Formation on the Leading Half of Cluster Galaxies and Gas Compression in IC3949

被引：20

作者：

Roberts, Ian D. ^{[1
]}

Lang, Maojin ^{[1
]}

Trotsenko, Daria ^{[1
]}

Bemis, Ashley R. ^{[1
]}

Ellison, Sara L. ^{[2
]}

Lin, Lihwai ^{[3
]}

Pan, Hsi-An ^{[4
]}

Ignesti, Alessandro ^{[5
]}

Leslie, Sarah ^{[1
]}

van Weeren, Reinout J. ^{[1
]}

机构：

[1] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[2] Univ Victoria, Dept Phys & Astron, Finnerty Rd, Victoria, BC V8P 1A1, Canada

[3] Acad Sinica, Inst Astron & Astrophys, Sect 4,1 Roosevelt Rd, Taipei 10617, Taiwan

[4] Tamkang Univ, Dept Phys, New Taipei City 251301, Taiwan

[5] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, IT-35122 Padua, Italy

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 941卷 / 01期

关键词：

RAM-PRESSURE; MOLECULAR GAS; IRREGULAR GALAXIES; IONIZED-GAS; DENSE GAS; EVOLUTION; I; SPECTROSCOPY; ENVIRONMENT; CONVERSION;

D O I：

10.3847/1538-4357/ac9e9f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With Mapping Nearby Galaxies at APO integral field spectroscopy, we present a resolved analysis of star formation for 29 jellyfish galaxies in nearby clusters, identified from radio continuum imaging taken by the Low Frequency Array. Simulations predict enhanced star formation on the "leading half" (LH) of galaxies undergoing ram pressure stripping, and in this work we report observational evidence for this elevated star formation. The dividing line (through the galaxy center) that maximizes this star formation enhancement is systematically tied to the observed direction of the ram-pressure-stripped tail, suggesting a physical connection between ram pressure and this star formation enhancement. We also present a case study on the distribution of molecular gas in one jellyfish galaxy from our sample, IC3949, using Atacama Large Millimeter/submillimeter Array CO J = 1 - 0, HCN J = 1 - 0, and HCO+ J = 1 - 0 observations from the ALMA MaNGA Quenching and Star Formation Survey. The H-2 depletion time (as traced by CO) in IC3949 ranges from similar to 1 Gyr in the outskirts of the molecular gas disk to similar to 11 Gyr near the galaxy center. IC3949 shows a clear region of enhanced star formation on the LH of the galaxy where the average depletion time is similar to 2.7 Gyr, in line with the median value for the galaxy on the whole. Dense gas tracers, HCN and HCO+, are only detected at the galaxy center and on the LH of IC3949. Our results favor a scenario in which ram pressure compresses the interstellar medium, promoting the formation of molecular gas that in turn fuels a localized increase of star formation.

引用

页数：14

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