TY - JOUR
T1 - GASP XXV
T2 - Neutral hydrogen gas in the striking jellyfish galaxy JO204
AU - Deb, Tirna
AU - Verheijen, Marc
AU - Gullieuszik, Marco
AU - Poggianti, Bianca M.
AU - Gorkom ,van, Jacqueline
AU - Ramatsoku, Mpati
AU - Serra, Paolo
AU - Moretti, Alessia
AU - Vulcani, Benedetta
AU - Bettoni, Daniela
AU - Jaffé, Yara L.
AU - Tonneson, Stephanie
AU - Fritz, Jacopo
N1 - Funding Information:
YLJ acknowledges financial support from CONICYT PAI (Concurso Nacional de Insercion en la Academia 2017) No. 79170132 and FONDECYT (the National Fund for Scientific and Technological Development) Iniciacion 2018 No. 11180558.
Publisher Copyright:
© 2020 The Author(s).
PY - 2020/6/1
Y1 - 2020/6/1
N2 - We present JVLA-C observations of the H I gas in JO204, one of the most striking jellyfish galaxies from the GASP survey. JO204 is a massive galaxy in the low-mass cluster Abell 957 at z=0.04243. The H I map reveals an extended 90 kpc long ram pressure stripped tail of neutral gas, stretching beyond the 30 kpc long ionized gas tail and pointing away from the cluster center. The H I mass seen in emission is (1.32 ±0.13) × 10^9 M_solar, mostly located in the tail. The northern part of the galaxy disk has retained some H I gas, while the southern part has already been completely stripped and displaced into an extended unilateral tail. Comparing the distribution and kinematics of the neutral and ionized gas in the tail indicates a highly turbulent medium. Moreover, we observe associated H I absorption against the 11 mJy central radio continuum source with an estimated H I absorption column density of 3.2 ×10^20 cm^−2. The absorption profile is significantly asymmetric with a wing towards higher velocities. We modelled the H I absorption by assuming that the H I and ionized gas disks have the same kinematics in front of the central continuum source, and deduced a wider absorption profile than observed. The observed asymmetric absorption profile can therefore be explained by a clumpy, rotating H I gas disk seen partially in front of the central continuum source, or by ram-pressure pushing the neutral gas towards the center of the continuum source, triggering the AGN activity.
AB - We present JVLA-C observations of the H I gas in JO204, one of the most striking jellyfish galaxies from the GASP survey. JO204 is a massive galaxy in the low-mass cluster Abell 957 at z=0.04243. The H I map reveals an extended 90 kpc long ram pressure stripped tail of neutral gas, stretching beyond the 30 kpc long ionized gas tail and pointing away from the cluster center. The H I mass seen in emission is (1.32 ±0.13) × 10^9 M_solar, mostly located in the tail. The northern part of the galaxy disk has retained some H I gas, while the southern part has already been completely stripped and displaced into an extended unilateral tail. Comparing the distribution and kinematics of the neutral and ionized gas in the tail indicates a highly turbulent medium. Moreover, we observe associated H I absorption against the 11 mJy central radio continuum source with an estimated H I absorption column density of 3.2 ×10^20 cm^−2. The absorption profile is significantly asymmetric with a wing towards higher velocities. We modelled the H I absorption by assuming that the H I and ionized gas disks have the same kinematics in front of the central continuum source, and deduced a wider absorption profile than observed. The observed asymmetric absorption profile can therefore be explained by a clumpy, rotating H I gas disk seen partially in front of the central continuum source, or by ram-pressure pushing the neutral gas towards the center of the continuum source, triggering the AGN activity.
KW - galaxies: clusters: intracluster medium
KW - galaxies: evolution
KW - galaxies: ISM
UR - https://academic.oup.com/mnras/article-abstract/494/4/5029/5824170?redirectedFrom=PDF
U2 - 10.1093/mnras/staa968
DO - 10.1093/mnras/staa968
M3 - Article
SN - 0035-8711
VL - 494
SP - 5029
EP - 5043
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -