The Nature of the Young Supernova Remnant S8 in the Dwarf Galaxy IC 1613

Abstract

We present sub-arcsecond optical images and low- to moderate-resolution spectra of the compact, X-ray and optically bright supernova remnant known as S8 in the nearby dwarf galaxy IC 1613. Deep H$\alpha$ images of the remnant show a sharply defined crescent shaped nebula, while narrow passband images reveal a coincident and unexpectedly bright continuum nebulosity exhibiting a size and morphology like that seen for the remnant's line emissions. Low-dispersion spectra covering 3600 - 9000 A show numerous low-ionization line emissions such as [O I] and [Fe II], along with higher-ionization emission lines including He II and optical coronal lines [Fe VII], [Fe X], [Fe XI], and [Fe XIV]. This suggests the presence of a wide range of shock velocities from $\sim$ 50 to over 350 km s${}^{-1}$, corresponding to preshock densities of $\sim 1-30$ cm${}^{-3}$. Higher resolution spectra indicate an expansion velocity around 180 km s${}^{-1}$ with a $\sim 45$ km s${}^{-1}$ wide central cavity. H$\alpha$ emission spans rest frame velocities of $+120$ to $-240$ km s${}^{-1}$ and we estimate a total nebula mass of $119\pm 34$ M${}_{\odot }$. We conclude S8 is a relatively young supernova remnant ($\simeq 2700-4400$ yr) exhibiting properties remarkably like those seen in the young LMC remnant N49, including age, physical size, shock velocities, filament densities, optical line strengths, X-ray and optical luminosities, and coronal line and continuum emissions.

arXiv comment19 pages, 6 figures, and 5 tables. Accepted for publication in ApJ

References in corpus (40)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Cosmic-Ray Rejection by Laplacian Edge Detection
• New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies
• Young core collapse supernova remnants and their supernovae
• ASCA X-Ray Spectroscopy of LMC Supernova Remnants and the Metal Abundances of the LMC
• Deep Hubble Space Telescope Imaging of IC 1613 II. The Star Formation History
• The population of X-ray supernova remnants in the Large Magellanic Cloud
• The Chandra ACIS Survey of M33: X-ray, Optical and Radio Properties of the Supernova Remnants
• Statistical Analysis of Supernova Remnants in the Large Magellanic Cloud
• Nebular Abundances of Nearby Southern Dwarf Galaxies
• Upgrading electron temperature and electron density diagnostic diagrams of forbidden line emission
• Theoretical ISM pressure and electron density diagnostics for local and high-redshift galaxies
• Physical Conditions of the Coronal Line Region in Seyfert Galaxies
• The Araucaria Project. The Distance to the Local Group Galaxy IC 1613 from Near-Infrared Photometry of Cepheid Variables
• The Carnegie-Chicago Hubble Program. II. The Distance to IC 1613: The Tip of the Red Giant Branch and RR Lyrae Period-Luminosity Relations
• An X-Ray Study of Supernova Remnant N49 and Soft Gamma-Ray Repeater 0526-66 in the Large Magellanic Cloud
• Winds of low-metallicity OB-type stars: HST-COS spectroscopy in IC1613
• Revealing New Physical Structures in the Supernova Remnant N63A through Chandra Imaging Spectroscopy
• A multi-wavelength study of Supernova Remnants in six nearby galaxies. II. New optically selected Supernova Remnants
• An Expanded HST/WFC3 Survey of M83: Project Overview and Targeted Supernova Remnant Search
• Ejecta Knot Flickering, Mass Ablation, and Fragmentation in Cassiopeia A
• Calibrating Interstellar Abundances using SNR Radiative Shocks
• Optical Structure and Proper-Motion Age of the Oxygen-rich Supernova Remnant 1E 0102-7219 in the Small Magellanic Cloud
• The Crab Nebula's Composition and Precursor Star Mass
• MMT Spectroscopy of Supernova Remnant Candidates in M33
• Forbidden Iron Lines and Dust Destruction in Supernova Remnant Shocks: The Case of N49 in the Large Magellanic Cloud
• X-ray emission from the Sculptor galaxy NGC 300
• Element Distributions In The Crab Nebula
• [Fe XIV] and [Fe XI] reveal the forward shock in SNR 1E0102.2-7219
• Carbon, Helium and Proton Kinetic Temperatures in a Cygnus Loop Shock Wave
• Quantitative Spectroscopy of Supergiants in the Local Group Dwarf Galaxy IC 1613: Metallicity and Distance
• X-Ray Luminosity and Size Relationship of Supernova Remnants in the LMC
• The influence of massive stars in the interstellar medium of IC 1613: the supernova remnant S8 and the nebula S3 associated with a WO star
• Optical Spectra of SNR Candidates in NGC 300
• Interstellar Medium Surrounding the WO Star in the Galaxy IC 1613: New Optical and Radio Observations
• Multiwavelength Study of the X-Ray Bright Supernova Remnant N300-S26 in NGC 300
• The X-ray-Resolved Supernova Remnant S8 in the Dwarf Irregular Galaxy IC 1613
• New Results of Observations of the Only Supernova Remnant in the IC1613 Galaxy

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