2022ApJ...941...77R

Query : 2022ApJ...941...77R

2022ApJ...941...77R - Astrophys. J., 941, 77 (2022/December-2)

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

ROBERTS I.D., LANG M., TROTSENKO D., BEMIS A.R., ELLISON S.L., LIN L., PAN H.-A., IGNESTI A., LESLIE S. and VAN WEEREN R.J.

Abstract (from CDS):

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 H2 depletion time (as traced by CO) in IC3949 ranges from ∼1 Gyr in the outskirts of the molecular gas disk 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 ∼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.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy clusters - Star formation - Ram pressure stripped tails - Galaxy quenching - Molecular gas

Simbad objects: 38

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Number of rows : 38
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 2276 AG? 07 27 14.485 +85 45 16.20   12.3       ~ 393 0
2 NGC 2300 AG? 07 32 20.486 +85 42 31.90   12.2       ~ 346 0
3 NGC 4402 GiC 12 26 07.65312 +13 06 47.9376   12.55       ~ 421 2
4 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
5 Z 159-101 EmG 12 52 48.8919914064 +27 24 06.741104220   15.3   14.95   ~ 49 0
6 Z 160-20 AGN 12 56 06.097 +27 40 41.17   15.5 13.65 14.92   ~ 125 0
7 IC 3913 EmG 12 56 28.5817741560 +27 17 28.501401516   15.82 14.94 14.97   ~ 105 0
8 IC 837 EmG 12 57 31.168 +26 30 42.86   15.4       ~ 69 0
9 TT 33 AGN 12 58 18.6318954144 +27 18 38.983019940   16.95 15.94 15.69   ~ 83 0
10 Z 160-64 EmG 12 58 35.335 +27 15 52.92   15.4 15.18 15.14   ~ 106 0
11 Z 160-67 AGN 12 58 37.27827 +27 10 35.7420   15.88 14.71 14.50   ~ 129 1
12 IC 3949 AGN 12 58 55.952 +27 50 00.40 15.31 15.10 14.26 14.781 14.083 ~ 148 1
13 LEDA 44586 EmG 12 59 23.1503980152 +28 29 19.019855220   16 15.73 15.65   ~ 38 0
14 LEDA 44643 EmG 12 59 39.8152735224 +27 34 35.193798804   16.53 15.56 15.42   ~ 55 0
15 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
16 LEDA 83749 EmG 13 00 33.5444273400 +27 30 14.898517781   16 15.53 15.50   ~ 37 0
17 Z 160-86 EmG 13 00 33.732 +27 38 15.64   15.4 14.54 14.23   ~ 117 0
18 NGC 4926A EmG 13 02 07.91760 +27 38 53.9770   15.1       ~ 122 0
19 Z 160-108 EmG 13 02 12.774 +28 12 53.47   15.5       ~ 67 0
20 Z 160-127 EmG 13 04 26.5545655056 +27 18 15.399934452   15.5   15.38   ~ 80 0
21 LEDA 2017338 G 13 18 42.2166078504 +32 55 07.316784084   18.172       ~ 22 0
22 NAME NGC 5098 Group GrG 13 20 14.4 +33 08 38           ~ 65 0
23 LEDA 2168096 GiC 16 21 41.5899541656 +40 35 28.030073640           ~ 23 0
24 LEDA 2175783 GiC 16 23 40.474 +41 06 15.75           ~ 15 0
25 Z 224-16 EmG 16 24 57.2737895712 +39 31 52.427052588   15.6       ~ 38 0
26 Z 224-21 AGN 16 25 49.25712 +40 20 42.8204   15.3       ~ 75 0
27 LEDA 2156782 GiC 16 26 36.6560501640 +39 51 31.170472308           ~ 29 0
28 ACO 2197 ClG 16 27 48.01 +40 58 04.5           ~ 290 0
29 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
30 Z 224-44 GiG 16 28 50.1670995120 +39 50 06.304797384   15.5       ~ 60 0
31 ZW IV 62 rG 16 28 58.0087730880 +39 19 08.826831264   16.9       ~ 49 0
32 LEDA 58307 GiC 16 29 01.5835566000 +40 32 05.481836484   15.8       ~ 36 0
33 Z 224-57 Sy2 16 30 33.2875467696 +39 49 50.548850652   15.3       ~ 49 0
34 LEDA 2568088 G 17 14 50.71154 +57 34 13.0890           ~ 20 0
35 NAME NGC 6338 Group GrG 17 15 32.47 +57 25 19.0           ~ 95 0
36 LEDA 2566358 G 17 16 57.72082 +57 28 48.0235           ~ 15 0
37 LEDA 1479719 EmG 23 23 36.9014892696 +15 15 32.312734308           ~ 13 0
38 ACO 2593 ClG 23 24 27.15 +14 33 40.2           ~ 231 0

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