J/ApJS/265/53 A statistical analysis of Galactic radio SNRs (Ranasinghe+, 2023)
A statistical analysis of Galactic radio supernova remnants.
Ranasinghe S., Leahy D.
<Astrophys. J. Suppl. Ser., 265, 53 (2023)>
=2023ApJS..265...53R 2023ApJS..265...53R
ADC_Keywords: Supernova remnants; Radio sources; Stars, ages; Stars, diameters;
Stars, distances
Keywords: Supernova remnants ; Radio astronomy
Abstract:
We present a revised table of 390 Galactic radio supernova remnants
(SNRs) and their basic parameters. Statistical analyses are performed
on SNR diameters, ages, spectral indices, Galactic heights, and
spherical symmetries. Furthermore, the accuracy of distances estimated
using the Σ-D relation is examined. The arithmetic mean of the
Galactic SNR diameters is 30.5pc with standard error 1.7pc and
standard deviation 25.4pc. The geometric mean and geometric standard
deviation factor of Galactic SNR diameters is 21.9pc and 2.4,
respectively. We estimate ages of 97 SNRs and find a supernova (SN)
birth rate lower than, but within 2σ of, currently accepted
values for the SN birth rate. The mean spectral index of shell-type
SNRs is -0.51±0.01 and no correlations are found between spectral
indices and the SNR parameters of molecular cloud association, SN
type, diameter, Galactic height, and surface brightness. The Galactic
height distribution of SNRs is best described by an exponential
distribution with a scale height of 48±4pc. The spherical symmetry
measured by the ovality of radio SNRs is not correlated to any other
SNR parameters considered here or to explosion type.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 295 390 Galactic SNRs and their parameters
--------------------------------------------------------------------------------
See also:
VII/15 : Galactic Supernova Remnants Catalogue (Ilovaisky+ 1972)
VII/14 : Galactic Supernova Remnants Catalogue (Clark+ 1976)
VII/187 : A Catalogue of Galactic Supernova Remnants (Green 1995)
VII/284 : A Catalogue of Galactic Supernova Remnants (Green, 2019)
J/ApJS/73/781 : X-ray obs. of galactic Supernova Remnants (Seward, 1990)
J/AJ/104/704 : VLA Search for Young Galactic SNRs (Sramek+, 1992)
J/other/BSAO/46.62 : RATAN observations of Galactic SNRs (Trushkin+, 1998)
J/A+A/508/1331 : CO maps of 3 galactic supernova remnants (Liszt, 2009)
J/ApJS/187/495 : SNRs in M33 from optical and X-ray (Long+, 2010)
J/ApJ/786/130 : Catalog of M31 SNR candidates (Lee+, 2014)
J/MNRAS/437/1791 : RMS survey: molecular observations (Urquhart+, 2014)
J/A+A/612/A3 : HESS Galactic supernova remnants (Hess+, 2018)
J/A+A/651/A86 : GLOSTAR Galactic plane survey. II. SNR. (Dokara+, 2021)
http://snrcat.physics.umanitoba.ca/ : SNRcat; high-energy catalog of SNRs
http://www.mrao.cam.ac.uk/surveys/snrs/ : Online Green's catalog of Gal. SNRs
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 I1 --- Set [1/3] Set (1)
3- 5 I3 --- Seq [1/390] Running sequence number
7- 19 A13 --- SNR Position-based Supernova remnant
name (6)
21- 27 F7.2 arcmin Size1 [0.17/1440]? Size, major axis
29- 35 F7.2 arcmin Size2 [0.17/1440]? Size, minor axis
37- 38 A2 --- Type Supernova remnant Type (2)
39 A1 --- l_S1GHz [<> ] Limit flag on S1GHz
40- 46 F7.2 Jy S1GHz [0.07/2300]? 1GHz Flux density
48 A1 --- q_S1GHz [? ] Quality flag on S1GHz
50- 54 F5.2 --- alpha [-1/0.6]? Spectral index, α
56 A1 --- u_alpha [? ] Quality flag on alpha
58- 61 F4.2 --- e_alpha [0.01/0.6]? Lower Uncertainty on alpha
63- 67 F5.3 --- E_alpha [0.01/0.6]? Upper Uncertainty on alpha
69- 87 A19 --- r_alpha Reference for alpha (bibcode)
89 A1 --- l_X [<> ] Limit flag on X
90- 95 F6.3 kpc X [0.2/20]? Heliocentric distance
97 A1 --- f_X Flag on X (3)
99- 104 F6.3 kpc e_X [0.02/4.5]? Lower Uncertainty on X
106- 110 F5.3 kpc E_X [0.02/4.5]? Upper Uncertainty on X
112 A1 --- l_Y [<> ] Limit flag on Y
113- 118 F6.2 kpc Y [0/17.5]? Galactocentric distance
120 A1 --- f_Y Flag on Y (3)
122- 125 F4.2 kpc e_Y [0.1/8.4]? Lower Uncertainty on Y
127- 131 F5.2 kpc E_Y [0.1/13.3]? Upper Uncertainty on Y
133 A1 --- l_Z [<> ] Limit flag on Z
134- 139 F6.1 pc Z [-342.3/608.1]? Height above Galaxy
mid-plane
141- 145 F5.1 pc e_Z [0.2/223.6]? Lower Uncertainty on Z
147- 151 F5.1 pc E_Z [0.2/410]? Upper Uncertainty on Z
153- 156 A4 --- MCInt Molecular Cloud Interactions
158- 176 A19 --- r_MCInt Reference for MCInt (bibcode)
181 A1 --- l_Age [<> ] Limit flag on Age
183- 190 F8.3 kyr Age [0.057/1900]? Age
192 A1 --- f_Age Flag on Age (3)
194- 199 F6.3 kyr e_Age [0.01/70]? Lower Uncertainty on Age
201- 207 F7.3 kyr E_Age [0.01/200]? Upper Uncertainty on Age
209 A1 --- n_Age [*] *=new or revised (97 occurrences)
211- 229 A19 --- r_Age Reference for Age (bibcode)
231- 239 A9 --- SN Supernova type
241- 259 A19 --- r_SN Reference for SN (bibcode)
264 A1 --- l_Rad [<> ] Limit flag on Rad
265- 269 F5.1 pc Rad [0.1/85.9]? Average radius (4)
271- 274 F4.1 pc e_Rad [0.1/49.8]? Lower Uncertainty on Rad
276- 279 F4.1 pc E_Rad [0.1/49.8]? Upper Uncertainty on Rad
281- 289 F9.3 10-21W/m2/Hz/sr SB [0.03/13844]? Surface brightness
291 A1 --- u_SB [? ] Quality flag on SB
293- 295 I3 % Oval [0/143]? Ovality (5)
--------------------------------------------------------------------------------
Note (1): Set as follows:
1 = Green's SNR Catalog (2019, VII/284)
2 = UManitoba Catalog (http://snrcat.physics.umanitoba.ca/)
3 = Newly identified SNRs in literature search (7 occurrences).
Note (2): SNR Type as follows:
S = Shell (239 + 40"?" occurrences)
F = Filled center (34 + 17"?" occurrences)
C = Composite (25 + 20"?" occurrences)
? = 15 occurrences
Note (3): When the flag is set to "R" the uncertainties are a range of
values instead of a range of uncertainties.
Note (4): The average radius, Rad=(rmaj*rmin)0.5, where rmaj
is the semi-major axis and rmin is the semi-minor axis.
Note (5): Here the ovality is estimated as defined by
Bozzetto+ 2017ApJS..230....2B 2017ApJS..230....2B in their Equation (9):
Ovality(%)=(2(Dmaj-Dmin))/(Dmaj+Dmin) where
Dmaj and Dmin are the major and minor axes, respectively.
Note (6): Declination signs for G008.3+00.0, G009.7+00.0, G010.5+00.0,
G011.0+00.0, G012.7+00.0, G012.8+00.0, G017.0+00.0, G066.0+00.0,
G294.1+00.0, G298.6+00.0, G315.9+00.0, G316.3+00.0, G338.3+00.0,
G348.5+00.0, G355.6+00.0, G322.9+00.0 and G359.9+00.0 have been changed
by CDS to minus signs as in SNRCat and Green.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-May-2023