Gemini GMOS/IFU spectroscopy of NGC 1569 - I: Mapping the properties of a young star cluster and its environment

Abstract

[Abridged] We present Gemini-North GMOS/IFU observations of a young star cluster (cluster 10) and its environment near the centre of the dwarf irregular starburst galaxy NGC 1569. This forms part of a larger and on-going study of the formation and collimation mechanisms of galactic winds, including three additional IFU pointings in NGC 1569 covering the base of the galactic wind which are analysed in a companion paper. The good spatial- and spectral-resolution of these GMOS/IFU observations, covering 4740-6860 A, allow us to probe the interactions between clusters and their environments on small scales. Combining our GMOS spectrum with HST imaging, we find that cluster 10 is composed of two very close components with ages of 5-7 Myr and <5 Myr, and a combined mass of 7 +/- 5 x 10^3 Msun. A detailed analysis of the H_alpha emission line profile shapes across the whole field-of-view shows them to be composed of a bright narrow feature (intrinsic FWHM ~ 50 km/s) superimposed on a fainter broad component (FWHM < 300 km/s). By mapping the properties of each individual component, we investigate the small-scale structure and properties of the ionized ISM, including reddening, excitation and electron densities, and for the first time find spatial correlations between the line component properties. We discuss in detail the possible mechanisms that could give rise to the two components and these correlations, and conclude that the most likely explanation for the broad emission is that it is produced in a turbulent mixing layer on the surface of the cool gas clumps embedded within the hot, fast-flowing cluster winds. We conclude we are sampling well within the outer bounding shocks of the expanding superbubbles and within the outflow 'energy injection zone'.

arXiv comment22 pages, 14 figures, 4 tables, accepted to MNRAS

References in corpus (36)

• Stellar population synthesis at the resolution of 2003
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• Theoretical Modeling of Starburst Galaxies
• Cosmic-Ray Rejection by Laplacian Edge Detection
• The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
• Drizzle: A Method for the Linear Reconstruction of Undersampled Images
• The Metal Content of Dwarf Starburst Winds: Results from Chandra Observations of NGC 1569
• Young massive star clusters in nearby galaxies. II.Software tools, data reductions and cluster sizes
• The Impact of Star Formation on the Interstellar Medium in Dwarf Galaxies: II. The Formation of Galactic Winds
• The Asymmetric Wind in M82
• ISM Properties in Low-Metallicity Environments II. The Dust Spectral Energy Distribution of NGC 1569
• Reduced Wolf-Rayet Line Luminosities at Low Metallicity
• FUSE Observations of Outflowing OVI in the Dwarf Starburst Galaxy NGC1705
• The Resolved Stellar Population of the Post-Starburst Galaxy NGC 1569
• The Star Clusters in the Starburst Irregular Galaxy NGC 1569
• (Sub)millimetre emission from NGC 1569: an abundance of very small grains
• Star Cluster Formation and Evolution in the Dwarf Starburst Galaxy NGC 1569
• HI distribution and kinematics of NGC 1569
• The dynamics and high-energy emission of conductive gas clouds in supernova-driven galactic superwinds
• Dynamical and Pressure Structures in Winds with Multiple Embedded Evaporating Clumps I. 2D Numerical Simulations
• The Detection of the Diffuse Interstellar Bands in Dusty Starburst Galaxies
• The ionising cluster of 30 Doradus.IV. Stellar kinematics
• The stellar content of the super star clusters in NGC 1569
• On the feedback from super stellar clusters. I. The structure of giant HII regions and HII galaxies
• Triggering and Feedback: The Relation between the HI Gas and the Starburst in the Dwarf Galaxy NGC 1569
• Kinematics and Structure of the Starburst Galaxy NGC 7673
• The Massive Star Population in the Giant HII Region Tol89 in NGC5398
• E3D, The Euro3D Visualization Tool I: Description of the program and its capabilities
• Multifrequency radio continuum observations of NGC 1569: Evidence for a convective wind
• A search for radio supernovae and supernova remnants in the region of NGC1569's super star clusters
• 3D Spectroscopy of Blue Compact Galaxies. Diagnostic Diagrams
• The Super Star Cluster NGC 1569-A Resolved on Sub-Parsec Scales with Hubble Space Telescope Spectroscopy
• Unresolved Wind-Driven Shells and the Supersonic Velocity Dispersion in Giant HII Regions
• The Starburst-Interstellar Medium Interaction of NGC 1569 I. Location and Nature of He II Sources Using Hubble Space Telescope WFPC2 Imagery
• The Starburst-Interstellar Medium Interaction in NGC 1569 II. Small-Scale Examination of Nebular Emission, H II Region Size Distribution, and H II Region Luminosity Function
• Distribution of extinction and star formation in NGC1569

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