A Chandra X-ray survey of nearby dwarf starburst galaxies: II. Starburst properties and outflows

Abstract

(abridged) We present a comprehensive comparison of the X-ray properties of a sample of eight dwarf starburst galaxies observed with Chandra (I Zw 18, VII Zw 403, NGC 1569, NGC 3077, NGC 4214, NGC 4449, NGC 5253, He 2-10). In Paper I we presented in detail the data reduction and analysis of the individual galaxies. For the unresolved X-ray sources we find the following: point sources are in general located close to bright HII regions, rims of superbubbles, or young stellar clusters. The number of X-ray point sources appears to be a function of the current star formation rate and the blue luminosity of the hosts. Ultraluminous X-ray sources are only found in those dwarf galaxies which are currently interacting. The power law index of the combined cumulative X-ray point source luminosity function is alpha=0.24+/-0.06, shallower than that of more massive starburst galaxies (alpha=0.4-0.8) and of non-starburst galaxies (alpha~1.2). For those galaxies showing extended X-ray emission (6 out of the 8 galaxies), we derive the following: Superwinds develop along the steepest gradient of the HI distribution with volume densities of 0.02-0.06 cm^-3, pressures of 1-3x10^5 K cm^-3, thermal energies of 2-30x10^54 erg, and hot gas masses of 2-20x10^6 Mo (~1 per cent of the HI masses). The mechanical luminosities of the developing superwinds are energetic enough to overcome the gravitational potentials of their host galaxies. This scenario is supported by the overpressures of the hot gas compared to the ambient ISM. Extended HI envelopes such as tidal tails, however, may delay outflows on timescales exceeding those of the cooling time of the hot gas.

arXiv comment22 pages, 14 figures, accepted for publication in MNRAS, high resolution version available from ftp://ftp.atnf.csiro.au/pub/people/jott/down/ott_chandra_dwarfs2.pdf

References in corpus (36)

• The Global Schmidt Law in Star Forming Galaxies
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• The Neutral Atomic Phases of the ISM in the Galaxy
• Starburst-driven Mass Loss from Dwarf Galaxies: Efficiency and Metal Ejection
• The Molecular Interstellar Medium in Ultraluminous Infrared Galaxies
• High Mass X-ray Binaries as a Star Formation Rate Indicator in Distant Galaxies
• Starburst-driven galactic winds: I. Energetics and intrinsic X-ray emission
• The Metal Content of Dwarf Starburst Winds: Results from Chandra Observations of NGC 1569
• On Measuring Chemical Abundances in Distant Galaxies Using Global Emission Line Spectra
• The Impact of Star Formation on the Interstellar Medium in Dwarf Galaxies: II. The Formation of Galactic Winds
• On the typical timescale for the chemical enrichment from SNeIa in Galaxies
• The Role of Stellar Feedback and Dark Matter in the Evolution of Dwarf Galaxies
• Chandra observations of NGC 253. II: On the origin of diffuse X-ray emission in the halos of starburst galaxies
• A Spectroscopic Study of a Large Sample of Wolf-Rayet Galaxies
• A Catalog of Candidate Intermediate-luminosity X-ray Objects
• A Catalog of Digital Images of 113 Nearby Galaxies
• The HST Key Project on the Extragalactic Distance Scale XXV. A Recalibration of Cepheid Distances to Type Ia Supernovae and the Value of the Hubble Constant
• Extragalactic database. VII Reduction of astrophysical parameters
• The Complex Kinematics of the Neutral Hydrogen Associated with IZw18
• The X-ray Luminosity Function of "The Antennae" Galaxies (NGC4038/39) and the Nature of Ultra-Luminous X-ray Sources
• Galactic winds and circulation of the ISM in dwarf galaxies
• A Mini-survey of X-ray Point Sources in Starburst and Non-Starburst Galaxies
• Kinematic Evidence for Superbubbles in I Zw 18: Constraints on the Star Formation History and Chemical Evolution
• On the Energy Required to Eject Processed Matter from Galaxies
• Displacement of X-Ray Sources from Star Clusters in Starburst Galaxies
• On the Fate of Processed Matter in Dwarf Galaxies
• Ultraluminous X-ray Sources and Star Formation
• Dust In I Zw 18 From Hubble Space Telescope Narrow Band Imaging
• The Interacting Dwarf Galaxy NGC 3077: The Interplay of Atomic and Molecular Gas with Violent Star Formation
• Chandra Observation of NGC4449. Analysis of the X-ray Emission from a Dwarf Starburst Galaxy
• Tip of the Red Giant Branch Distances to NGC 4214, UGC 685, and UGC 5456
• Multi-method-modeling of interacting galaxies. I. A unique scenario for NGC 4449?
• The Interaction between the ISM and Star Formation in the Dwarf Starburst Galaxy NGC 4214
• Evolution of the X-ray luminosity and metallicity of starburst blown superbubbles
• Chandra Observations of Expanding Shells in the Dwarf Starburst Galaxy NGC 3077
• On the recent history of star formation in the BCD galaxy VII Zw403

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• Bulgeless Giant Galaxies Challenge our Picture of Galaxy Formation by Hierarchical Clustering
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• Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
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