The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant

Abstract

HST ACS images of the young SN remnant Cas A are used to explore the expansion and spatial distribution of its highest velocity debris. Proper motions of over 1800 outlying ejecta knots are reported. The distribution of transverse expansion velocities for these knots shows a striking bipolar asymmetry with the highest velocity knots confined to nearly opposing northeast and southwest `jets'. The jets appear kinematically and chemically distinct with respect to the remnant's highest velocity debris seen in other directions. Significant gaps in the spatial distribution of outlying ejecta lie in directions which are approximately perpendicular to the jets. Extrapolations of 9 month proper motions for all outer ejecta knots and a subsample of 72 bright and compact knots suggest explosion dates (assuming no knot deceleration) of 1662 +/- 27 and 1672 +/- 18, respectively. We find some evidence for non-uniform deceleration in different directions with knots located along the northwestern limb among the least decelerated ejecta suggesting a convergence date of 1681 +/-19. The remnant's central X-ray point source lies some $7^{\prime \prime }$ to the southeast of the estimated expansion center (PA = 169 deg) indicating a projected motion of ~350 km/s toward the middle of the broad southern outer ejecta knot gap.

13 pages, 5 figures, ApJ, in press

References in corpus (2)

• Getting Its Kicks: A VLBA Parallax for the Hyperfast Pulsar B1508+55
• Infrared Echoes near the Supernova Remnant Cassiopeia A

Cited by in corpus (109)

• Rapid Cooling of the Neutron Star in Cassiopeia A Triggered by Neutron Superfluidity in Dense Matter
• The Cassiopeia A Supernova was of Type IIB
• From Shock Breakout to Peak and Beyond: Extensive Panchromatic Observations of the Type Ib Supernova 2008D associated with Swift X-ray Transient 080109
• Asymmetries in core-collapse supernovae from maps of radioactive ${}^{44}$Ti in CassiopeiaA
• The dust mass in Cassiopeia A from a spatially resolved Herschel analysis
• Evolution of a buried magnetic field in the central compact object neutron stars
• The distribution of radioactive ${}^{44}$Ti in Cassiopeia A
• Searches for Continuous-Wave Gravitational Radiation
• Tests of the nuclear equation of state and superfluid and superconducting gaps using the Cassiopeia A neutron star
• Searching for gravitational waves from Cassiopeia A with LIGO
• Aspherical Properties of Hydrodynamics and Nucleosynthesis in Jet-induced Supernovae
• Upper Limit on the QCD Axion Mass from Isolated Neutron Star Cooling
• Thermal luminosities of cooling neutron stars
• Cooling rates of neutron stars and the young neutron star in the Cassiopeia A supernova remnant
• Astrophysical Axion Bounds: The 2024 Edition
• The Bubble-like Interior of the Core-Collapse Supernova Remnant Cassiopeia A
• The Science of the Einstein Telescope
• The Broad-Lined Type Ic SN 2012ap and the Nature of Relativistic Supernovae Lacking a Gamma-ray Burst Detection
• Observations of the shell-type SNR Cassiopeia A at TeV energies with VERITAS
• Spectropolarimetry of the Type Ib/c SN 2005bf
• Comparing Neutron Star Kicks to Supernova Remnant Asymmetries
• Interstellar and Ejecta Dust in the Cas A Supernova Remnant
• The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg
• Dust masses for SN 1980K, SN1993J and Cassiopeia A from red-blue emission line asymmetries
• Unified model for the gamma-ray emission of supernova remnants
• Evidence for proton acceleration up to TeV energies based on VERITAS and Fermi-LAT observations of the Cas A SNR
• Diffusive nuclear burning in cooling simulations and application to new temperature data of the Cassiopeia A neutron star
• Small-Scale X-ray Variability in the Cassiopeia A Supernova Remnant
• Constraints on the symmetry energy from observational probes of the neutron star crust
• A JWST Survey of the Supernova Remnant Cassiopeia A
• Evidence for past interaction with an asymmetric circumstellar shell in the young SNR Cassiopeia A
• Constraints on explosive silicon burning in core-collapse supernovae from measured Ni/Fe ratios
• The Kinematic and Plasma Properties of X-ray Knots in Cassiopeia A from the Chandra HETGS
• Modeling the X-rays from the Central Compact Object PSR J1852+0040 in Kesteven 79: Evidence for a Strongly Magnetized Neutron Star
• Superfluid phases of triplet pairing and rapid cooling of the neutron star in Cassiopeia A
• Jets as diagnostics of the circumstellar medium and the explosion energetics of supernovae: the case of Cas A
• Do Central Compact Objects have Carbon Atmospheres?
• Search of the Early O3 LIGO Data for Continuous Gravitational Waves from the Cassiopeia A and Vela Jr. Supernova Remnants
• The Shape of Cas A
• The mass, location and heating of the dust in the Cassiopeia A supernova remnant
• High-entropy ejecta plumes in Cassiopeia A from neutrino-driven convection
• A Comparison of X-ray and Optical Emission in Cassiopeia A
• Search for Continuous Gravitational Waves from the Central Compact Objects in Supernova Remnants Cassiopeia A, Vela Jr. and G347.3-0.5
• An Einstein@home search for continuous gravitational waves from Cassiopeia A
• The Three-Dimensional Expansion of the Ejecta from Tycho's Supernova Remnant
• Supernova remnants with magnetars: clues to magnetar formation
• Comparing supernova remnants around strongly magnetized and canonical pulsars
• Cosmic nucleosynthesis: a multi-messenger challenge
• Properties of gamma-ray decay lines in 3D core-collapse supernova models, with application to SN 1987A and Cas A
• Three-Dimensional Kinematic Reconstruction of the Optically-Emitting, High-Velocity, Oxygen-Rich Ejecta of Supernova Remnant N132D
• Isolated X-ray -- infrared sources in the region of interaction of the supernova remnant IC 443 with a molecular cloud
• Search for gravitational waves from twelve young supernova remnants with a hidden Markov model in Advanced LIGO's second observing run
• X-ray bounds on cooling, composition, and magnetic field of the Cassiopeia A neutron star and young central compact objects
• A 20 Year Radio Light Curve for the Young Supernova Remnant G1.9+0.3
• Dust survival rates in clumps passing through the Cas A reverse shock -- II. The impact of magnetic fields
• Quantitative Age Estimation of Supernova Remnants and Associated Pulsars
• Magnetohydrodynamic turbulence in supernova remnants
• 3D mapping of the Crab Nebula with SITELLE. I. Deconvolution and kinematic reconstruction
• The properties of non-thermal X-ray filaments in young supernova remnants
• A Sub-Solar Metallicity Progenitor for Cassiopeia A, the remnant of a Type IIb Supernova
• Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide -- TiO
• The dust mass in Cassiopeia A from infrared and optical line flux differences
• Near-Infrared Knots and Dense Fe Ejecta in the Cassiopeia A Supernova Remnant
• Model-independent constraints on superfluidity from the cooling neutron star in Cassiopeia A
• Three-dimensional morphological asymmetries in the ejecta of Cassiopeia A using a component separation method in X-rays
• Impact of axions on the Cassiopea A neutron star cooling
• Capture of free-floating planets by stellar systems
• X-ray Fading and Expansion in the "Miniature Supernova Remnant" of GK Persei
• Hydrodynamic simulations of the interaction of supernova shock waves with a clumpy environment: the case of the RX J0852.0-4622 (Vela Jr) supernova remnant
• Modelling supernova nebular lines in 3D with $\text{ExTraSS}$
• On the continuum radio-spectrum of Cas A: possible evidence of the non-linear particle acceleration
• Multi-Year X-ray Variations of Iron-K and Continuum Emissions in the Young Supernova Remnant Cassiopeia A
• Is Supernova Remnant Cassiopeia A a PeVatron?
• VLA and ATCA Search for Natal Star Clusters in Nearby Star-Forming Galaxies
• Light Curves and Spectra from a Unimodal Core-Collapse SuperNova
• From Supernova to Remnant: Tracking the Evolution of the Oldest Known X-ray Supernovae
• The Center of Expansion and Age of the Oxygen-rich Supernova Remnant 1E 0102.2-7219
• Cataclysmic variables as possible counterparts of ancient Far Eastern guest stars
• Astrophysics in 2006
• Filamentary Ejecta Network in Cassiopeia~A Reveals Fingerprints of the Supernova Explosion Mechanism
• Discovery of Stable Titanium at the Northeastern Jet of Cassiopeia A: Need for a Weak Jet Mechanism?
• A Large-field J=1-0 Survey of CO and Its Isotopologues Toward the Cassiopeia A Supernova Remnant
• Witnessing History: Rates and Detectability of Naked-Eye Milky-Way Supernovae
• New estimation of the nuclear de-excitation line emission from the supernova remnant Cassiopeia A
• Probing Interstellar Dust with Infrared Echoes from the Cas A Supernova
• The auto and cross angular power spectrum of the Cas A supernova remnant in radio and X-ray
• Hybrid cooling of the Cassiopeia A neutron star
• X-ray counterpart detection and gamma-ray analysis of the SNR G279.0+01.1 with eROSITA and Fermi-LAT
• ATCA Study of Small Magellanic Cloud Supernova Remnant 1E 0102.2-7219
• Searching for continuous gravitational waves from slowly spinning neutron stars with DECIGO, Big Bang Observer, Einstein Telescope and Cosmic Explorer
• On the origin of the asymmetry of the ejecta structure and explosion of G350.1$-$0.3
• HST Proper Motion Measurements of Supernova Remnant N132D: Center of Expansion and Age
• Cooling of the Cassiopeia A neutron star and the effect of diffusive nuclear burning
• Near-Infrared Spectroscopy of Dense Ejecta Knots in the Outer Eastern Area of the Cassiopeia A Supernova Remnant
• Probing Strong Field $f(R)$ Gravity and Ultra-Dense Matter with the Structure and Thermal Evolution of Neutron Stars
• The Korean 1592--1593 Record of a Guest Star: An `impostor' of the Cassiopeia A Supernova?
• Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool
• XRISM Observations of Cassiopeia A: Overview, Atomic Data, and Spectral Models
• Searches for continuous gravitational waves from young supernova remnants in the early third observing run of Advanced LIGO and Virgo
• Far-infrared Polarization of the Supernova Remnant Cassiopeia A with SOFIA HAWC+
• Radioactive Decay
• Results from an Einstein@Home search for continuous gravitational waves from Cassiopeia A and Vela Jr. using LIGO O2 data
• A Study of Radio Knots within Supernova Remnant Cassiopeia A
• Thermal Evolution of Neutron Stars as a Probe of Physics beyond the Standard Model
• On the formation of over-ionized plasma in evolved supernova remnants
• Radiative-transfer modeling of supernovae in the nebular-phase. A novel treatment of chemical mixing in spherical symmetry
• The forward and reverse shock dynamics of Cassiopeia A
• A New Versatile Code for Gamma-Ray Monte-Carlo Radiative Transfer
• An Asymmetrical Model for High Energy Radiation of Cassiopeia A