GASP. XV. A MUSE view of extreme ram-pressure stripping along the line of sight: physical properties of the Jellyfish Galaxy JO201

Callum Bellhouse, Y. L. Jaffe, Sean L. McGee, B. M. Poggianti, Roy Smith, S. Tonnesen, J. Fritz, G. K. T. Hau, M. Gullieuszik, B. Vulcani, G. Fasano, A. Moretti, K. George, D. Bettoni, M. D'Onofrio, A. Omizzolo, Y. -K. Sheen

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Abstract

We present a study of the physical properties of JO201, a unique disk galaxy with extended tails undergoing extreme ram-pressure stripping as it moves through the massive cluster Abell 85 at supersonic speeds mostly along the line of sight. JO201 was observed with MUSE as part of the GASP programme. In a previous paper (GASP II) we studied the stellar and gas kinematics. In this paper we present emission-line ratios, gas-phase metallicities and ages of the stellar populations across the galaxy disk and tails. We find that while the emission at the core of the galaxy is dominated by an active galactic nucleus (AGN), the disk is composed of star-forming knots surrounded by excited diffuse gas. The collection of star-forming knots presents a metallicity gradient steadily decreasing from the centre of the galaxy outwards, and the ages of the stars across the galaxy show that the tails formed
Original languageEnglish
Pages (from-to)1157-1170
JournalMonthly Notices of the Royal Astronomical Society
Volume485
Issue number1
Early online date17 Feb 2019
DOIs
Publication statusPublished - 1 May 2019

Bibliographical note

17 pages, 12 figures

Keywords

  • astro-ph.GA
  • galaxies: clusters: intracluster medium
  • galaxies: interactions
  • galaxies: ISM

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