J/ApJ/940/63 Reliable distances of Galactic SNRs (Ranasinghe+, 2022)
Distances, radial distribution, and total number of Galactic supernova remnants.
Ranasinghe S., Leahy D.
<Astrophys. J., 940, 63 (2022)>
=2022ApJ...940...63R 2022ApJ...940...63R
ADC_Keywords: Supernova remnants; Stars, distances; Space velocities
Keywords: Supernova remnants ; Radio astronomy ; H I line emission ;
Galaxy structure
Abstract:
We present a table of 215 supernova remnants (SNRs) with distances.
New distances are found to SNR G51.26+0.11 of 6.6±1.7kpc using HI
absorption spectra and to five other SNRs using maser/molecular cloud
associations. We recalculate the distances and errors to all SNRs
using a consistent rotation curve and provide errors where they were
not previously estimated. This results in a significant distance
revisions for 20 SNRs. Because of observational constraints and
selection effects, there is an apparent deficit of observed number of
Galactic SNRs. To investigate this, we employ two methods. The first
method applies correction factors for the selection effects to derive
the radial density distribution. The second method compares functional
forms for the SNR surface density and selection function against the
data to find which functions are consistent with the data. The total
number of SNRs in the Galaxy is ∼3500 (Method 1) or in the range from
∼2400 to ∼5600 (Method 2). We conclude that the current observed
number of SNRs is not yet complete enough to give a well-determined
total SNR number or radial density function.
Description:
To obtain the source list, we use the catalog presented by
Green (2019, VII/284). Apart from this catalog, we use the catalog
presented by Ferrand & Safi-Harb (2012AdSpR..49.1313F 2012AdSpR..49.1313F) to search for
remnants with reliable distances. Furthermore, we performed a
literature search for newly identified SNRs.
For supernova remnants (SNRs) with no published distances, if there
are molecular cloud (MC) or maser associations, we infer the distances
from those. The literature distances have been estimated using
different rotation curves, with the distance to the Galactic center
(GC), R0, ranging from 7.6 to 8.5kpc and the orbital velocity of the
Sun, V0, ranging from 200 to 245km/s. In this work, for consistency
we recalculate the distances using the values presented by
Reid+ (2014, J/ApJ/783/130) of R0=8.34±0.16 and V0=241±8km/s,
along with their "Univ" parameters, to estimate a distance where an
associated velocity is given.
See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 145 215 Galactic supernova remnants (SNRs) with reliable
distances
refs.dat 102 145 References
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See also:
VII/284 : A Catalogue of Galactic Supernova Remnants (Green, 2019)
J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)
J/ApJ/690/706 : Distances of Galactic HII regions (Anderson+, 2009)
J/A+A/508/1331 : CO maps of 3 galactic supernova remnants (Liszt, 2009)
J/ApJ/754/62 : HRDS III. HII region kinematic distances (Anderson+, 2012)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/A+A/627/A75 : VRO 42.05.01 CO datacubes (Arias+, 2019)
J/A+A/634/A83 : THOR DR2 source list (Wang+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/215] Running sequence number
5- 17 A13 --- SNR SNR name (GLLL.ll+BB.bb)
19 A1 --- f_SNR Flag on SNR (1)
21- 22 A2 --- l_Distl1 [<≥∼ ] Limit flag on Distl1
24- 29 F6.3 kpc Distl1 [0.2/20]? Literature distance or lower range of
literature distance if Distl2 is filled
31- 34 F4.1 kpc Distl2 [2.5/13]? Upper range of literature distance
36- 40 F5.3 kpc e_Distl1 [0.02/4.5]? Lower uncertainty on Distl1
42- 46 F5.3 kpc E_Distl1 [0.02/4.5]? Upper uncertainty on Distl1
48- 50 A3 kpc Distl3 Other literature distance
52- 77 A26 --- Method Method
79- 85 F7.2 km/s Vlsr1 [-115/104]? LSR velocity or lower range of LSR
velocity if Vlsr2 is filled
87- 90 I4 km/s Vlsr2 [-145/-45]? Upper range of LSR velocity
92 I1 km/s e_Vlsr1 [5/6]? Vlsr1 uncertainty
94- 99 A6 --- n_Vlsr1 Note on VLSR (2)
101- 108 A8 --- Ref Reference(s) (see refs.dat file)
110 A1 --- l_Dist Limit flag on Dist
112- 116 F5.2 kpc Dist [0.5/16.7]? Revised distance (3)
118- 121 F4.2 kpc e_Dist [0.16/1.8]? Dist uncertainty (4)
123- 124 A2 --- l_Rgc1 [≥ ] Limit flag on Rgc1
126- 130 F5.2 kpc Rgc1 [0/16.5]? Galactocentric distance or lower
range of Galactocentric distance if Rgc2 is
filled
132- 135 F4.1 kpc Rgc2 [13.3]? Upper range of Galactocentric distance
137- 140 F4.2 kpc e_Rgc1 [0.05/3.8]? Lower uncertainty on Rgc1
142- 145 F4.2 kpc E_Rgc1 [0.05/4.1]? Upper uncertainty on Rgc1
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Note (1): Flag as follows:
d = new SNRs that are not in the catalog presented by Green (2019, VII/284)
D = uncertain SNRs (i.e., more observational evidence is needed)
Note (2): Flag as follows:
c = The VLSR is from Hewitt & Yusef-Zadeh (2009ApJ...694L..16H 2009ApJ...694L..16H).
d = The VLSR is from Koralesky+ (1998AJ....116.1323K 1998AJ....116.1323K).
Note (3): The distances for most SNRs and the errors are recalculated using the
rotation curve parameters presented by Reid+ (2014ApJ...783..130R 2014ApJ...783..130R).
Note (4): The errors of the distances were recalculated as described by
Ranasinghe & Leahy (2018MNRAS.477.2243R 2018MNRAS.477.2243R).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference code
5- 28 A24 --- Auth Author's name(s)
30- 48 A19 --- BibCode Bibcode of the reference
50- 102 A53 --- Comm Comment
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 18-Oct-2024