Comparing the three-dimensional morphological asymmetries in the ejecta of Kepler and Tycho in X-rays

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Volume 687 (July 2024)

A&A, 687 (2024) A28

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Table 4

Results of fitting the spectral components retrieved by pGMCA.

Parameter	Redshifted	Other 1	Other 2	Blueshifted
Kepler

τ_Si–Ca (s cm⁻³)	$5.3 e 10_{- 1.3 e 10}^{+ 4.3 e 10}$ $5.3{\rm{e}}10_{ - 1.3e10}^{ + 4.3e10}$	$1.2 e 11_{- 3.8 e 10}^{+ 7.4 e 10}$ $1.2{\rm{e}}11_{ - 3.8e10}^{ + 7.4e10}$	–	$1.7 e 11_{- 1.7 e 10}^{8.5 e 9}$ $1.7{\rm{e}}11_{ - 1.7e10}^{8.5e9}$
τ_Fe (s cm⁻³)	$1.1 e 10_{- 4.7 e - 9}^{+ 1.9 e 10}$ $1.1{\rm{e}}10_{ - 4.7e - 9}^{ + 1.9e10}$	–	–	$2.3 e 10_{- 2.6 e 9}^{+ 3.4 e 9}$ $2.3{\rm{e}}10_{ - 2.6e9}^{ + 3.4e9}$
redshift_Si–Ca	$2.3 e- 2_{- 6.3 e - 4}^{+ 1.4 e - 3}$ $2.3{\rm{e - }}2_{ - 6.3e - 4}^{ + 1.4e - 3}$	$1.4 e- 3_{- 7 e - 5}^{5 e - 4}$ $1.4{\rm{e - }}3_{ - 7e - 5}^{5e - 4}$	–	$2.2 e- 4_{- 2.2 e - 3}^{+ 1 e - 4}$ $2.2{\rm{e - }}4_{ - 2.2e - 3}^{ + 1e - 4}$
redshift_Fe	$9.9 e- 3_{- 2.5 e - 3}^{+ 1.9 e - 3}$ $9.9{\rm{e - }}3_{ - 2.5e - 3}^{ + 1.9e - 3}$	–	–	−1.6e-3 to 2.2e-3
V_Si–Ca (km s⁻¹)	$6900_{- 190}^{+ 420}$ $6900_{ - 190}^{ + 420}$	$420_{- 20}^{+ 150}$ $420_{ - 20}^{ + 150}$	–	$66_{- 660}^{+ 30}$ $66_{ - 660}^{ + 30}$
V_Fe (km s⁻¹)	$3000_{750}^{+ 570}$ $3000_{750}^{ + 570}$	–	–	−480 to 660

Tycho

τ_Si–Ca (s cm⁻³)	8e10± 3e10	$4.3 e 10_{- 5.5 e 9}^{+ 8.8 e 9}$ $4.3{\rm{e}}10_{ - 5.5e9}^{ + 8.8e9}$	5e10 to 7e10	$1.07 e 11_{- 1.0 e 10}^{+ 1.2 e 10}$ $1.07{\rm{e}}11_{ - 1.0e10}^{ + 1.2e10}$
τ_Fe (s cm⁻³ )	–	$6.3 e 9_{- 3 e 9}^{+ 6.3 e 9}$ $6.3{\rm{e}}9_{ - 3e9}^{ + 6.3e9}$	6e8 to 7e9	$1.77 e 10_{- 5.3 e 9}^{+ 5.1 e 9}$ $1.77{\rm{e}}10_{ - 5.3e9}^{ + 5.1e9}$
redshift_Si–Ca	$2.9 e- 2_{- 1.2 e - 2}^{+ 2.8 e - 3}$ $2.9{\rm{e - }}2_{ - 1.2e - 2}^{ + 2.8e - 3}$	$2.8 e- 3_{- 2.0 e - 4}^{+ 2.3 e - 3}$ $2.8{\rm{e - }}3_{ - 2.0e - 4}^{ + 2.3e - 3}$	−1.4e-2 to 7e-3	$- 5.2 e- 3_{- 3.5 e - 4}^{+ 2.2 e - 4}$ $- 5.2{\rm{e - }}3_{ - 3.5e - 4}^{ + 2.2e - 4}$
redshift_Fe	–	$- 2.4 e- 3_{- 3.1 e - 3}^{+ 2.7 e - 3}$ $- 2.4{\rm{e - }}3_{ - 3.1e - 3}^{ + 2.7e - 3}$	−2e-3 to 8e-3	$- 8.2 e- 3_{- 3.4 e - 3}^{+ 3.9 e - 3}$ $- 8.2{\rm{e - }}3_{ - 3.4e - 3}^{ + 3.9e - 3}$
V_Si–Ca (km s⁻¹)	$8700_{- 4200}^{+ 840}$ $8700_{ - 4200}^{ + 840}$	$840_{- 60}^{+ 690}$ $840_{ - 60}^{ + 690}$	−3600 to 2100	$- 1560_{- 105}^{+ 66}$ $- 1560_{ - 105}^{ + 66}$
V_Fe (km s⁻¹)	–	$- 720_{- 810}^{+ 930}$ $- 720_{ - 810}^{ + 930}$	−600 to 2400	$- 2460_{- 1020}^{+ 1170}$ $- 2460_{ - 1020}^{ + 1170}$

Notes. In Kepler, we see that the measured Doppler shifts are all consistent with positive (redshifted) velocities. Our “red” component is highly redshifted, while the other components have small velocities. For the Fe velocity in the “blue” component, multiple equally-valid fits returned different best-fit Doppler shifts; we report the spread between these models. In Tycho, we see that our measured Doppler shifts span large positive and negative velocities. Our “red” component is highly redshifted, our “blue” component is moderately blueshifted, and our “other 1” component shows a mix of both slight redshifts and blueshifts. As noted in Sect. 3.2, the apprent cut-off of the Fe K-α line in this component suggest that this “other 1” Fe emission might actually be part of the “blue” component. As for the “other 2” Tycho component, multiple equally valid fits returned different best-fit parameters; we report the spread between these models instead of the 90% CI from a single model.

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