CHANDRA ACIS Spectroscopy of N157B -- A Young Composite Supernova Remnant in a Superbubble

Abstract

We present Chandra ACIS observations of N157B, a young supernova remnant located in the 30 Doradus star-formation region of the LMC. This remnant contains the most energetic pulsar known (PSR J0537-6910), which is surrounded by a bright nonthermal nebula that likely represents a toroidal pulsar wind terminal shock observed edge-on. We confirm the non-thermal nature of the comet-shaped X-ray emission feature and show that the spectral steepening of this feature away from the pulsar is quantitatively consistent with synchrotron cooling of shocked pulsar wind particles flowing downstream at a bulk velocity close to the speed of light. Around the cometary nebula we unambiguously detect a thermal component, which accounts for about 1/3 of the total 0.5 - 10 keV flux from the remnant. This thermal component is distributed among various clumps of metal-enriched plasma embedded in the low surface brightness X-ray-emitting diffuse gas. The relative metal enrichment pattern suggests that the mass of the supernova progenitor is >~ 20M_sun. A comparison of the X-ray data with HST optical images suggests that the explosion site is close to a dense cloud, against which a reflection shock is launched. The interaction between this reflection shock and the nebula has likely produced both its cometary shape and the surrounding thermal emission enhancement. SNR N157B is apparently expanding into the hot low-density interior of a surrounding superbubble formed by the young OB association LH99, as revealed by Spitzer mid-infrared images. This scenario naturally explains the exceptionally large sizes of both the thermal and nonthermal components as well as the lack of an outer shell of the SNR. These results provide a rare glimpse into the SNR structure and evolution in a region of recent star-formation.

Slightly revised to match the ApJ version. Fig.1 of high resolution available at http://astronomy.nju.edu.cn/~ygchen/paper/N157B/f1.eps.gz

References in corpus (43)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• How Massive Single Stars End their Life
• Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission
• Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula
• The Vela Pulsar and its Synchrotron Nebula
• X-ray emitting young stars in the Orion Nebula
• Fitting Pulsar Wind Tori
• Discovery of an Ultra-fast X-ray Pulsar in the Supernova Remnant N157B
• A Bow Shock Nebula Around a Compact X-Ray Source in the Supernova Remnant IC443
• Mapping the X-ray Emitting Ejecta in Cassiopeia A with Chandra
• The origin of peculiar jet-torus structure in the Crab nebula
• Spatial Variation of the X-ray spectrum of the Crab Nebula
• Evolution of X-ray emission from young massive star clusters
• Chandra Observation of SNR G54.1+0.3 -- a Close Cousin of the Crab Nebula
• A Chandra/ACIS Study of 30 Doradus I. Superbubbles and Supernova Remnants
• Chandra Observations of the Crab-like Supernova Remnant G21.5-0.9
• Relativistic MHD simulations of pulsar bow-shock nebulae
• An evolutionary model for pulsar-driven supernova remnants
• X-ray Spectra of Young Pulsars and Their Wind Nebulae: Dependence on Spin-down Energy
• The Pulsar Wind Nebula Around PSR B1853+01 in the Supernova Remnant W44
• Interaction of High-Velocity Pulsars with Supernova Remnant Shells
• X-ray Detection of Pulsar PSR B1757-24 and its Nebular Tail
• Supernova Blastwaves in Low-density Hot Media: a Mechanism for Spatially Distributed Heating
• X-Ray Observations of the supernova remnant G21.5-0.9
• ROSAT and ASCA observations of the Crab-Like Supernova Remnant N157B in the Large Magellanic Cloud
• The Structure of the Oxygen-rich Supernova Remnant G292.0+1.8 from Chandra X-ray Images: Shocked Ejecta and Circumstellar Medium
• The plerion nebula in IC 443: the XMM-Newton view
• The X-ray Structure of the Pulsar Bow Shock G189.22+2.90 in the Supernova Remnant IC 443
• The X-ray Structure and Spectrum of the Pulsar Wind Nebula Surrounding PSR B1853+01 in W44
• A spatially resolved plerionic X-ray nebula around PSR B0540-69
• Detection of an X-ray Pulsar Wind Nebula and Tail in SNR N157B
• ASCA Observation of the Crab-Like Supernova Remnant 3C58
• Revealing New Physical Structures in the Supernova Remnant N63A through Chandra Imaging Spectroscopy
• Correction for the Flux Measurement Bias in X-ray Source Detection
• The Plerionic Supernova Remnant G21.5-0.9: In and Out
• The Extended X-ray Halo of the Crab-like SNR G21.5-0.9
• The first broad-band X-ray images and spectra of the 30 Doradus region in the LMC
• Confronting the Superbubble Model with X-ray Observations of 30 Dor C
• X-ray Observation and Analysis of The Composite Supernova Remnant G327.1-1.1
• Radio Properties of the Supernova Remnant N157B
• A Search for Radio Emission from the Young 16-ms X-ray Pulsar PSR J0537-6910
• Search for the elusive optical counterpart of PSR J0537-6910 with the HST Advanced Camera for Surveys
• Do we really observe a bow shock in N157B...?

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