Haro 11: Where is the Lyman continuum source?

Abstract

Identifying the mechanism by which high energy Lyman continuum (LyC) photons escaped from early galaxies is one of the most pressing questions in cosmic evolution. Haro 11 is the best known local LyC leaking galaxy, providing an important opportunity to test our understanding of LyC escape. The observed LyC emission in this galaxy presumably originates from one of the three bright, photoionizing knots known as A, B, and C. It is known that Knot C has strong Ly$\alpha$ emission, and Knot B hosts an unusually bright ultraluminous X-ray source, which may be a low-luminosity AGN. To clarify the LyC source, we carry out ionization-parameter mapping (IPM) by obtaining narrow-band imaging from the Hubble Space Telescope WFC3 and ACS cameras to construct spatially resolved ratio maps of [OIII]/[OII] emission from the galaxy. IPM traces the ionization structure of the interstellar medium and allows us to identify optically thin regions. To optimize the continuum subtraction, we introduce a new method for determining the best continuum scale factor derived from the mode of the continuum-subtracted, image flux distribution. We find no conclusive evidence of LyC escape from Knots B or C, but instead, we identify a high-ionization region extending over at least 1 kpc from Knot A. Knot A shows evidence of an extremely young age ($\lesssim 1$ Myr), perhaps containing very massive stars ($>100$ M${}_{\odot }$). It is weak in Ly$\alpha$, so if it is confirmed as the LyC source, our results imply that LyC emission may be independent of Ly$\alpha$ emission.

arXiv comment12 pages, 6 Figures, Submitted to ApJ

References in corpus (38)

• The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 Msun stellar mass limit
• Dwarf Galaxies with Optical Signatures of Active Massive Black Holes
• Cosmic Reionization after Planck: Could Quasars Do It All?
• Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
• Faint AGNs at z>4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe
• Using Lyman-alpha to detect galaxies that leak Lyman continuum
• Lyman continuum leaking from the compact star-forming dwarf galaxy J0925+1403
• The Origin and Optical Depth of Ionizing Radiation in the "Green Pea" Galaxies
• The R136 star cluster dissected with Hubble Space Telescope/STIS. I. Far-ultraviolet spectroscopic census and the origin of HeII 1640 in young star clusters
• A ~50,000 solar mass black hole in the nucleus of RGG 118
• The Optical Depth of H II Regions in the Magellanic Clouds
• Escape of Lyman continuum radiation from local galaxies - Detection of leakage from the young starburst Tol 1247-232
• Massive stars and the energy balance of the ISM. I. The impact of an isolated 60 Msun star
• Dynamics of blue compact galaxies, as revealed by their H$\alpha$ velocity fields II. Mass models and the starburst triggering mechanism
• The Lyman alpha morphology of local starburst galaxies: release of calibrated images
• Super star clusters in Haro 11: Properties of a very young starburst and evidence for a near-infrared flux excess
• The Influence of Supershells and Galactic Outflows on the Escape of Ionizing Radiation from Dwarf Starburst Galaxies
• A Deep Hubble and Keck Search for Definitive Identification of Lyman Continuum Emitters at z~3.1
• Galactic porosity and a star formation threshold for the escape of ionising radiation from galaxies
• An X-ray Selected Sample of Candidate Black Holes in Dwarf Galaxies
• On the relative Contribution of high-redshift Galaxies and Active Galactic Nuclei to Reionization
• The First Deep ACS Lyman alpha Images of Local Starburst Galaxies
• Reducing low signal-to-noise FUSE spectra: confirmation of Lyman continuum escape from Haro 11
• Lyman alpha Emitting Galaxies in the Nearby Universe
• The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1
• The Very Massive Star Content of the Nuclear Star Clusters in NGC 5253
• The Brightest Young Star Clusters in NGC 5253
• On the Evolution of the Cosmic Ionizing Background
• The Lyman break analogue Haro 11: spatially resolved chemodynamics with VLT FLAMES
• Mrk 71/NGC 2366: The nearest Green Pea analog
• New Constraints on the Escape of Ionizing Photons From Starburst Galaxies Using Ionization-Parameter Mapping
• An Ionization Cone in the Dwarf Starburst Galaxy NGC 5253
• Kinematics of Haro11 - the miniature Antennae
• Continuum subtracting Lyman-alpha images: Low redshift studies using the Solar Blind Channel of HST/ACS
• Neutral ISM, Lyman-Alpha and Lyman-continuum in the nearby starburst Haro 11
• Ultra-Luminous X-ray Sources in Haro 11 and the Role of X-ray Binaries in Feedback in Lyman-alpha Emitting Galaxies
• Resolving Ionisation and Metallicity on Parsec Scales Across Mrk 71 with HST-WFC3
• Quantitative Method for the Optimal Subtraction of Continuum Emission from Narrow-band Images : Skewness Transition Analysis

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