Discovery of Ram-pressure Stripped Gas around an Elliptical Galaxy in Abell 2670
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Fecha
2017-05
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
IOP Publishing
Nombre de Curso
Licencia CC
Licencia CC
Resumen
Studies of cluster galaxies are increasingly finding galaxies with spectacular one-sided tails of gas and young stars, suggestive of intense ram-pressure stripping. These so-called "jellyfish" galaxies typically have late-type morphology. In this paper, we present Multi Unit Spectroscopic Explorer (MUSE) observations of an elliptical galaxy in Abell 2670 with long tails of material visible in the optical spectra, as well as blobs with tadpole-like morphology. The spectra in the central part of the galaxy reveal a stellar component as well as ionized gas. The stellar component does not have significant rotation, while the ionized gas defines a clear star-forming gas disk. We argue, based on deep optical images of the galaxy, that the gas was most likely acquired during a past wet merger. It is possible that the star-forming blobs are also remnants of the merger. In addition, the direction and kinematics of the one-sided ionized tails, combined with the tadpole morphology of the star-forming blobs, strongly suggests that the system is undergoing ram pressure from the intracluster medium. In summary, this paper presents the discovery of a post-merger elliptical galaxy undergoing ram-pressure stripping
Notas
Indexación: Scopus.
Palabras clave
Galaxies: clusters: individual (Abell 2670), Galaxies: clusters: intracluster medium, Galaxies: elliptical and lenticular, cD, Galaxies: kinematics and dynamics, Galaxies: star formation
Citación
Astrophysical Journal Letters Volume 840, Issue 1, 1 May 2017, Article number L7