J/ApJ/938/121 HST Ha obs. of SNR B0509-67.5 in 2006 & 2016 (Arunachalam+, 2022)
A hydro-based MCMC analysis of SNR 0509-67.5: revealing the explosion properties
from fluid discontinuities alone.
Arunachalam P., Hughes J.P., Hovey L., Eriksen K.
<Astrophys. J., 938, 121 (2022)>
=2022ApJ...938..121A 2022ApJ...938..121A
ADC_Keywords: Supernova remnants; Interstellar medium; Proper motions; Optical;
Photometry, H-alpha
Keywords: Supernova remnants ; Interstellar medium ; Shocks
Abstract:
Using Hubble Space Telescope/ACS Hα images of SNR 0509-67.5
taken ∼10yr apart, we measure the forward shock (FS) proper motions
(PMs) at 231 rim locations. The average shock radius and velocity are
3.66±0.036pc and 6315±310km/s. Hydrodynamic simulations, recast as
similarity solutions, provide models for the supernova remnant's
expansion into a uniform ambient medium. These are coupled to a Markov
chain Monte Carlo (MCMC) analysis to determine explosion parameters,
constrained by the FS measurements. For our baseline model, the MCMC
posteriors yield an age of 315.5±1.8yr, a dynamical explosion center
at 5:09:31.16,-67:31:17.1 and ambient medium densities at each azimuth
ranging over 3.7-8.0x10-25g/cm3. The age uncertainty can be an
order of magnitude larger when considering other models, or subsets of
the data. We detect stellar PMs corresponding to speeds in the Large
Magellanic Cloud ≥770km/s. Five stars in the remnant show measurable
PMs but none are moving radially from the dynamical center. There are
four stars 1.4" from the center, including three faint, previously
unidentified ones. Using coronal [FeXIV]λ5303 emission as a
proxy for the reverse shock location, we constrain the explosion
energy (for a compression factor of 4) to a value of
E=(1.30±0.41)x1051erg for the first time from shock kinematics
alone. Higher compression factors (7 or more) are strongly disfavored
based on multiple criteria, arguing for inefficient particle
acceleration in the Balmer shocks of SNR 0509-67.5.
Description:
For our analysis, we use two HST narrow-band Hα images of
SNR0509-67.5, which were observed with the F658N filter on the
Advanced Camera for Surveys (ACS). The first observation (epoch-1) was
taken on 2006 October 28 for an exposure time of 4620s under HST
program 11015 (PI: Hughes). The second observation (epoch-2) was taken
on 2016 November 13 with an exposure of 5331s under HST program 14733
(PI: Hovey). SNR 0509-67.5, approximately 30" in diameter, was
centered on CCD-2 of the WFC channel, which has a field of view of
202"x202".
Objects:
-----------------------------------------------------------
RA (ICRS) DE Designation(s)
-----------------------------------------------------------
05 09 30.99 -67 31 17.9 SNR 0509-67.5 = SNR B0509-67.5
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 231 The forward shock (FS) kinematic measurements and
derived results for SNR 0509-67.5
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AJ/117/238 : LMC extended catalog (Bica+, 1999)
J/other/Sci/340.45 : Fast shocks around SN 1006 (Nikolic+, 2013)
J/A+A/585/A162 : X-ray supernova remnants in LMC (Maggi+, 2016)
J/ApJ/950/L10 : SNR 0509-67.5 surviving companion search (Shields+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.6 deg RAdeg [77.36/77.4] Right Ascension (J2000) (1)
11- 20 F10.6 deg DEdeg [-67.6/-67.5] Declination (J2000) (1)
22- 25 F4.2 arcsec Raderr [0.04/0.8] Forward shock radius uncertainty
27- 30 F4.2 pix pm [3.79/7.73] Proper motion in shock-normal
direction (2)
32- 35 F4.2 pix e_pm [0.05/1.7] Uncertainty in pm (2)
37- 40 F4.1 --- chisq [3.2/56.3] Chi-square for profile comparison
42- 43 I2 --- dof [14/20] Degrees of freedom
45- 50 F6.2 deg PA Position Angle (3)
52- 54 F3.1 deg PAwidth [1/5] Position Angle bin width
56- 60 F5.2 arcsec Rad [14.45/17.9] Forward shock radius in 2011 (4)
62- 65 I4 km/s Vel [4406/8983] Forward shock velocity (5)
67- 70 F4.2 10-25g/cm3 rho [3.7/8.1]? MCMC Density value if in golden
sample
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Note (1): of forward shock in 2011.
Note (2): 1 HST pixel = 50 mas
Note (3): Position angles measured with respect to
geometric center (77.379833,-67.521422).
Note (4): Radii measured with respect to geometric center.
Note (5): Proper motion converted to velocities using an
LMC distance of 49.27kpc.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Aug-2024