VII/253 A Catalogue of Galactic Supernova Remnants (Green, 2009)
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A Catalogue of Galactic Supernova Remnants, 2009 March version.
Green D.A.
<Cavendish Laboratory, Cambridge, United Kingdom (2009)>
<Bull. Astron. Soc. India, 37, 45 (2009)>
=2009BASI...37...45G
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ADC_Keywords: Supernova remnants ; Milky Way ; Nonstellar objects
Abstract:
This catalogue of known Galactic supernova remnants (SNRs) is an
updated version of the catalogues of Galactic SNRs presented in detail
in Green (1984, 1988), in summary form in Green (1991, 1996, 2004),
and on the Web (versions of 1995 July, 1996 August, 1998 September,
2000 August, 2001 December, 2004 January and 2006 April). (Note that
version published in Green (1996) was produced in 1993.)
This the 2009 March version of the catalogue contains 274 SNRs, and is
based on results published in the literature up to the end of 2008.
The basic summary data included in this catalogue for each SNR are its
Galactic coordinates, RA and Dec (J2000.0), angular size, type, flux
density at 1 GHz, spectral index, and any other names. Notes on these
parameters, on possible remnants not included, and questionable SNRs
listed in the catalogue are given in the full version of the catalogue
on the Web. It should be noted that there are selection effects which
apply to the identification of Galactic SNRs (e.g., Green 1991, 2004,
2005, 2009), so that care should be taken if these data are used in
any statistical studies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
snrs.dat 88 274 Supernova Remnant catalogue
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See also:
VII/187 : the 1995 July version which was superseded by this catalogue
VII/210 : the 1996 August version which was superseded by this catalogue
VII/211 : the 1998 September version which was superseded by this catalogue
VII/227 : the 2001 December version which was superseded by this catalogue
http://www.mrao.cam.ac.uk/surveys/snrs/ : the on-line version
Byte-by-byte Description of file: snrs.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- SNR *SuperNova Remnant designation
14- 15 I2 h RAh *Right Ascension J2000 hours
17- 18 I2 min RAm *Right Ascension J2000 minutes
20- 21 I2 s RAs *Right Ascension J2000 seconds
24 A1 --- DE- *Declination sign
25- 26 I2 deg DEd *Declination J2000 degrees
28- 29 I2 arcmin DEm *Declination J2000 arcminutes
31- 35 F5.1 arcmin MajDiam *Major Angular Size of remnant
36 A1 --- --- [x]
37- 41 F5.1 arcmin MinDiam *? Minor Angular Size of remnant
42 A1 --- u_MinDiam [?] Uncertainty flag on Angular Size
44- 45 A2 --- type *[CFS? ] Type of remnant
47 A1 --- l_S(1GHz) [>] Limit flag on S(1GHz)
48- 53 F6.1 Jy S(1GHz) *? Flux Density at 1 GHz
54 A1 --- u_S(1GHz) [?] Uncertainty flag on S(1GHz)
56- 59 F4.2 --- Sp-Index *? Spectral Index of integrated radio emission
60- 61 A2 --- u_Sp-Index *[?v ] Uncertainty and variability flag on SI
63- 88 A26 --- Names *Other names commonly used
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Note on SNR:
This designation is based on the galactic longitude and latitude of
the source centroid quoted to the nearest tenth of a degree.
Note on RAh, RAm, RAs, DE-, DEd, DEm:
The accuracy of the quoted values depends on the size of the
remnant. For small remnants they are to the nearest few seconds of
time and the nearest minute of arc for RA and DEC respectively. For
the larger remnants they are rounded to coarser values. They are in
every case sufficient to specify a point within the boundary of the
remnant. These coordinates are generally deduced from radio maps
rather than from X-ray or optical observations, and are J2000.0.
Note on MajDiam, MinDiam:
Usually taken from the highest resolution radio map available. The
boundary of most remnants approximates reasonably well to a circle or
an ellipse; a single value is quoted for the angular size of the more
nearly circular remnants, which is the diameter of a circle with an area
equal to that of the remnant, but for elongated remnants the product of
two values is quoted, and these are the major and minor axes of the
remnant boundary modeled as an ellipse. In a few cases an ellipse is not
a satisfactory description of the boundary of the object (refer to the
description of the individual object given the detailed catalogue entry
on the Web), although an angular size is still quoted for information.
For "filled-centre" remnants the size quoted is for the largest extent
of the observed radio emission, not, as at times has been used, the
half-width of the centrally brightened peak.
Note on S(1GHz):
The flux density of the remnant at 1 GHz in jansky. This is not a
measured value, but that deduced from the observed radio frequency
spectrum of the source. The frequency of 1 GHz is chosen because flux
density measurements at frequencies both above and below this value
are usually available.
Note on Sp-Index, u_Sp-Index:
The spectral index is of the integrated radio emission from the
remnant, {alpha} where S({nu}) {prop.to} {v}^-{alpha}^.
This is either a value quoted from the literature, or one deduced from the
available integrated flux densities of the remnant. For several SNRs a
simple spectral model is not adequate to describe their radio emission
because the spectral index varies across the face of the remnant or
that the integrated spectrum is curved, and in these cases the spectral
index includes the 'v' in u_SI. In some cases, for example where the
remnant is highly confused with thermal emission, the spectral index
is given as '?' since no value can be deduced with any confidence.
Note on type:
S = remnant shows a shell radio structure
F = remnant shows a filled center ('plerion') radio structure
C = remnant shows a composite (or combination) radio structure
S?, C?, F? = there is some uncertainty
? = object is conventionally considered a SNR although its nature is
poorly known or not well understood.
Note on Names:
Other names commonly used for the object. These are given in
parentheses if the remnant is only part of the source. For some
objects, notably the Crab Nebula, not all other names are given.
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Remarks:
The on-line version on the World-Wide-Web at
http://www.mrao.cam.ac.uk/surveys/snrs/
contains much more information on the individual objects,
including many references, plus discussion of possible and
probable remnants that have been reported in the literature
but which are not included in the catalogue.
History:
* 09-Jun-2009: Prepared by Dave Green
References:
Green, D.A., 1984, MNRAS, 209, 449 =1984MNRAS.209..449G
Green, D.A., 1988, Ap&SS, 148, 3 =1988Ap&SS.148....3G
Green, D.A., 1991, PASP, 103, 209 =1991PASP..103..209G
Green, D.A., 1996, in Supernovae and Supernova Remnants, (the
proceedings IAU Colloquium 145), eds McCray R. & Wang Z.,
(Cambridge University Press), p419. =1996ssr..conf..419G
Green, D.A., 2004, BASI, 32, 335 =2004BASI...32..335G
Green, D.A., 2005, MmSAI, 76, 534G =2005MmSAI..76..534G
Green, D.A., 2009, BASI, 37, in press =2009arXiv0905.3699G
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(End) Dave Green 09-Jun-2009