Bibcode
Gadotti, D. A.; Seidel, M. K.; Sánchez-Blázquez, Patricia; Falcón-Barroso, J.; Husemann, Bernd; Coelho, Paula; Pérez, Isabel
Bibliographical reference
Astronomy and Astrophysics, Volume 584, id.A90, 19 pp.
Advertised on:
12
2015
Journal
Citations
58
Refereed citations
52
Description
We use data from the Multi-Unit Spectroscopic Explorer (MUSE), recently
commissioned at the Very Large Telescope (VLT), to study the kinematics
and stellar population content of NGC 4371, an early-type massive barred
galaxy in the core of the Virgo cluster. We integrate this study with a
detailed structural analysis using imaging data from the Hubble and
Spitzer Space Telescopes, which allows us to perform a thorough
investigation of the physical properties of the galaxy. We show that the
rotationally supported inner components in NGC 4371, i.e. an inner disc
and a nuclear ring - which, according to the predominant scenario, are
built with stars formed from gas brought to the inner region by the bar
- are vastly dominated by stars older than 10 Gyr. Our results thus
indicate that the formation of the bar occurred at a redshift of about
z=1.8+0.5-0.4 (error bars are derived from 100 Monte
Carlo realisations). NGC 4371 thus testifies to the robustness of bars.
In addition, the mean stellar age of the portion of the major disc of
the galaxy that is covered by our MUSE data is above 7 Gyr with a small
contribution from younger stars. This suggests that the quenching of
star formation in NGC 4371, which is very likely an environmental
effect, was already occurring at a redshift of about
z=0.8+0.2-0.1. Our results suggest that bar-driven
secular evolution processes may have an extended impact on the evolution
of galaxies, and thus on the properties of galaxies as observed today,
and not necessarily be restricted to more recent cosmic epochs.
Related projects
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro