GASP. IV. A Muse View of Extreme Ram-pressure-stripping in the Plane of the Sky: The Case of Jellyfish Galaxy JO204

Journal Article · Fri Sep 01 04:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA8322· OSTI ID:22875867

Gullieuszik, Marco; Poggianti, Bianca M.; Moretti, Alessia; Bettoni, Daniela; Fasano, Giovanni; Vulcani, Benedetta ^[1]; Fritz, Jacopo ^[2]; Jaffé, Yara L.; Hau, George; Bellhouse, Callum ^[3]; Bischko, Jan C. ^[4]; D’Onofrio, Mauro ^[5]; Biviano, Andrea ^[6]

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1. INAF—Astronomical Observatory of Padova, vicolo dell’Osservatorio 5, I-35122 Padova (Italy)
2. Instituto de Radioastronomía y Astrofísica, IRyA, UNAM, Campus Morelia, A.P. 3-72, C.P. 58089 (Mexico)
3. European Southern Observatory, Alonso de Córdova 3107, Santiago (Chile)
4. Institute of Astro- and Particle Physics, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck (Austria)
5. Department of Physics and Astronomy, University of Padova, Vicolo Osservatorio 3, I-35122 Padova (Italy)
6. INAF–Astronomical Observatory of Trieste, via G.B. Tiepolo 11, I-34131 Trieste (Italy)

In the context of the GAs Stripping Phenomena in galaxies with Muse (GASP) survey, we present the characterization of JO204, a jellyfish galaxy in A957, a relatively low-mass cluster with M=4.4×10{sup 14} M{sub ⊙}. This galaxy shows a tail of ionized gas that extends up to 30 kpc from the main body in the opposite direction of the cluster center. No gas emission is detected in the galaxy outer disk, suggesting that gas-stripping is proceeding outside-in. The stellar component is distributed as a regular disk galaxy; the stellar kinematics shows a symmetric rotation curve with a maximum radial velocity of 200 km s{sup −1} out to 20 kpc from the galaxy center. The radial velocity of the gas component in the central part of the disk follows the distribution of the stellar component; the gas kinematics in the tail retains the rotation of the galaxy disk, indicating that JO204 is moving at high speed in the intracluster medium. Both the emission and radial-velocity maps of the gas and stellar components indicate ram-pressure as the most likely primary mechanism for gas-stripping, as expected given that JO204 is close to the cluster center and it is likely at the first infall in the cluster. The spatially resolved star formation history of JO204 provides evidence that the onset of ram-pressure-stripping occurred in the last 500 Myr, quenching the star formation activity in the outer disk, where the gas has been already completely stripped. Our conclusions are supported by a set of hydrodynamic simulations.

• OSTI ID: 22875867
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 846; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPUTERIZED SIMULATION
DISTRIBUTION
EMISSION
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
HYDRODYNAMICS
MASS
RADIAL VELOCITY
ROTATION
STARS
STRIPPING
SYMMETRY