Internal Kinematics and Stellar Populations of the Poststarburst+AGN Galaxy SDSS J230743.41+152558.4

Abstract

We present the first 3D spectroscopic observations of a nearby HI detected poststarburst, or E+A, galaxy, SDSS J230743.41+152558.4, obtained with the VIMOS IFU spectrograph at ESO VLT. Using the NBursts full spectral fitting technique, we derive maps of stellar kinematics, age, and metallicity out to 2-3 half-light radii. Our analysis reveals a large-scale rapidly rotating disc (v_circ = 300km/s) with a positive age gradient (0.6 to 1.5 Gyr), and a very metal-rich central region ([Fe/H]=+0.25 dex). If a merger or interaction is responsible for triggering the starburst, the presence of this undisturbed disc suggests a minor merger with a gas-rich satellite as the most plausible option, rather than a disruptive major merger. We find spectroscopic evidence for the presence of a LINER or AGN. This is an important clue to the feedback mechanism that truncated the starburst. The presently observed quiescent phase may well be a temporary episode in the galaxy's life. SDSS J230743.41+152558.4 is gas-rich and may restart forming stars, again becoming blue before finally settling at the red sequence.

accepted for publication by Astrophysical Journal Letters, 9 pages, 4 figures

References in corpus (13)

• The Host Galaxies and Classification of Active Galactic Nuclei
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• Star formation efficiency in galaxy interactions and mergers: a statistical study
• On the frequency, intensity and duration of starburst episodes triggered by galaxy interactions and mergers
• The Detailed Evolution of E+A Galaxies into Early Types
• The UV properties of E+A galaxies: constraints on feedback-driven quenching of star formation
• The Tully-Fisher relation for S0 galaxies
• Kinematics and stellar populations of the dwarf elliptical galaxy IC 3653
• Kinematics and Stellar Populations of Low-Luminosity Early-Type Galaxies in the Abell 496 Cluster
• The Color Magnitude Distribution of Field Galaxies to z~3: the evolution and modeling of the blue sequence
• The HI content of E+A galaxies
• G515, Revisited. I. Stellar Populations And Evidence Of Nuclear Activity In A Luminous "E+A" Galaxy
• EA01A/B : high-resolution HI imaging of an interacting pair of post-starburst (E+A) galaxies

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• Analytical approximations of K-corrections in optical and near-infrared bands
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• GASP XXIV. The history of abruptly quenched galaxies in clusters
• Data Reduction Pipeline for the MMT and Magellan Infrared Spectrograph
• AGN feedback in elliptical galaxies: numerical simulations
• Stellar population gradients in the cores of nearby field E+A galaxies
• Stellar population gradients and spatially resolved kinematics in luminous post-starburst galaxies
• Discovery of Nine Intermediate Redshift Compact Quiescent Galaxies in the Sloan Digital Sky Survey
• NBursts+phot: parametric recovery of galaxy star formation histories from the simultaneous fitting of spectra and broad-band spectral energy distributions