The 3-D X-ray Ejecta Structure of Tycho's Supernova Remnant

Abstract

We present our velocity measurements of 59 clumpy, metal-rich ejecta knots in the supernova remnant (SNR) of SN 1572 (Tycho). We use our 450 ks Chandra High Energy Transmission Grating Spectrometer observation to measure the Doppler shift of the He-like Si K$\alpha$ line-center wavelength emitted from these knots to find their line-of-sight (radial) velocities ($v_r$). We find $v_r$ up to $\sim$ 5500 km s${}^{-1}$, with roughly consistent speeds between blueshifted and redshifted ejecta knots. We also measure the proper motions (PMs) for our sample based on archival Chandra Advanced CCD Imaging Spectrometer data taken from 2003, 2009, and 2015. We estimate PMs up to 0$"$.35 yr${}^{-1}$, which corresponds to a transverse velocity of about 5800 km s${}^{-1}$ for the distance of 3.5 kpc to Tycho. Our $v_r$ and transverse velocity measurements imply space velocities of $\sim$ 1900 - 6000 km s${}^{-1}$ for the ejecta knots in Tycho. We estimate a new expansion center of R.A.(J2000) = 00${}^h$25${}^m$18${}^s$.725 $\pm$ 1${}^s$.157 and decl.(J2000) = +64${}^{\circ }$08${}^{\prime }$02$"$.5 $\pm$ 11$"$.2 from our PM measurements, consistent to within $\sim$ 13$"$ of the geometric center. The distribution of space velocities throughout the remnant suggests that the southeast quadrant generally expands faster than the rest of the SNR. We find that blueshifted knots are projected more in the northern shell, while redshifted knots are more in the southern shell. The previously estimated reverse shock position is consistent with most of our estimated ejecta distribution, however some ejecta show deviations from the 1-D picture of the reverse shock.

arXiv comment16 pages, 7 figures, 3 tables, accepted for publication in ApJ

References in corpus (38)

• On the Absorption of X-rays in the Interstellar Medium
• Three-dimensional delayed-detonation models with nucleosynthesis for Type Ia supernovae
• Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission
• Spectropolarimetry of Supernovae
• UBVRI Light Curves of 44 Type Ia Supernovae
• The Cassiopeia A Supernova was of Type IIB
• Cosmic Ray Acceleration at the Forward Shock in Tycho's Supernova Remnant: Evidence from Chandra X-ray Observations
• Three-dimensional pure deflagration models with nucleosynthesis and synthetic observables for Type Ia supernovae
• The binary progenitor of Tycho Brahe's 1572 supernova
• Constraints on the Physics of Type Ia Supernovae from the X-Ray Spectrum of the Tycho Supernova Remnant
• Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum
• Instabilities and Clumping in Type Ia Supernova Remnants
• Probing X-ray Absorption and Optical Extinction in the Interstellar Medium Using Chandra Observations of Supernova Remnants
• XMM-Newton observation of the Tycho Supernova Remnant
• Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission
• X-Ray Measured Dynamics of Tycho's Supernova Remnant
• Effects of Explosion Asymmetry and Viewing Angle on the Type Ia Supernova Color and Luminosity Calibration
• New Evidence for Efficient Collisionless Heating of Electrons at the Reverse Shock of a Young Supernova Remnant
• Azimuthal Density Variations Around the Rim of Tycho's Supernova Remnant
• Searching for a Companion Star of Tycho's Type Ia Supernova with Optical Spectroscopic Observations
• A High-Resolution Spectroscopic Search for the Remaining Donor for Tycho's Supernova
• The X-ray Iron Emission from Tycho's Supernova Remnant
• X-ray Measurements of the Particle Acceleration Properties at Inward Shocks in Cassiopeia A
• From the supernova to the supernova remnant: the three-dimensional imprint of a thermonuclear explosion
• The Origin of the Iron-Rich Knot in Tycho's Supernova Remnant
• Direct Ejecta Velocity Measurements of Tycho's Supernova Remnant
• The Three-Dimensional Expansion of the Ejecta from Tycho's Supernova Remnant
• Chandra/HETGS Observations of the Capella System: the Primary as a Dominating X-ray Source
• From supernova to supernova remnant: comparison of thermonuclear explosion models
• Tycho-B: an unlikely companion for SN 1572
• Freely Expanding Knots of X-ray Emitting Ejecta in Kepler's Supernova Remnant
• In-Flight Calibration of the Chandra High Energy Transmission Grating Spectrometer
• Rapid Deceleration of Blast Waves Witnessed in Tycho's Supernova Remnant
• A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant
• An Ejecta Kinematics Study of Kepler's Supernova Remnant with High-Resolution $Chandra$ HETG Spectroscopy
• Genus Statistic Applied to the X-ray Remnant of SN 1572: Clues to the Clumpy Ejecta Structure of Type Ia Supernovae
• An explanation of the formation of the peculiar periphery of Tycho's supernova remnant
• RGS Observations of Ejecta Knots in Tycho's Supernova Remnant

Cited by in corpus (3)

• A fresh perspective on the 3D dynamics of Tycho's supernova remnant: Ejecta asymmetries in the X-ray band
• Bayesian insights in Tycho supernova remnant : a detailed mapping of ejecta properties
• Estimating Global Ejecta Mass Ratios in Tycho's SNR