VII/187 A Catalogue of Galactic Supernova Remnants (Green 1995)
A Catalogue of Galactic Supernova Remnants, 1995 July version Green D.A. <in Supernovae and Supernova Remnants, the proceedings IAU Colloquium 145, eds McCray R. & Wang Z., Cambridge University Press, p419 (1996)> =1996IAUCo.145..419G
ADC_Keywords: Supernova remnants ; Milky Way ; Nonstellar objects Abstract: This catalog lists all galactic supernova remnants known and is the July 1995 updated version of the catalogues of Galactic SNRs presented in detail in Green (1984, 1988) and in summary form in Green (1991,1996). The basic parameters of the 194 SNRs included in this (1995 July) version of the catalogue are, for each SNR, its Galactic coordinates, RA and Dec (B1950.0), angular size (in arcmin), 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 documentation. It should be noted that there are serious selection effects which apply to the identification of Galactic SNRs (see Green 1991), so that great care should be taken if these data are used in statistical studies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file snrs.doc 79 432 original documentation to the catalog snrs.dat 87 194 Supernova remnants catalog
See also: VII/163 : the 1994 version which was superseded by this catalog http://www.mrao.cam.ac.uk/surveys/snrs/ : the on-line version Byte-by-byte Description of file: snrs.dat
Bytes Format Units Label Explanations
2- 6 F5.1 deg GLON *Galactic longitude l 8- 12 F5.1 deg GLAT *Galactic latitude b 15- 16 I2 h RAh *Right Ascension B1950 hours 18- 19 I2 min RAm *Right Ascension B1950 minutes 21- 22 I2 s RAs *Right Ascension B1950 seconds 25 A1 --- DE- *Declination sign 26- 27 I2 deg DEd *Declination B1950 degrees 29- 30 I2 arcmin DEm *Declination B1950 arcminutes 33- 39 A7 arcmin2 Ang_Size *[0-9.x? ] Angular Size of remnant 42- 43 A2 --- type *[CFS? ] Type of remnant 46- 49 A4 Jy S(1GHz) *[0-9.? ] Flux Density at 1 GHx 53- 59 A7 --- SI *[ 0-9.?varies] Spectral Index of integrated radio emission 62- 87 A26 --- alt *Other names commonly used
Note on GLON, GLAT: Galactic Coordinates are 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 deduced from radio maps rather than from X-ray or optical observations, and are B1950.0. Note on Ang_Size: Usually taken from the highest resolution radio map available, although for some barely resolved sources that are thought to be SNRs the only available size is that from Gaussian models after deconvolution with the observed beam size. 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 in its catalogue entry), 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 1GHz in Jansky. This is not a measured value, but that deduced from the observed radio frequency spectrum of the source. The frequency of 1GHz is chosen because flux density measurements at frequencies both above and below this value are usually available. Note on SI: The spectral index of the integrated radio emission from the remnant 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 is given as 'varies'. In some cases 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 F remnant shows a filled center C remnant shows a composite or combination radio structure S?, C?, F? if there is some uncertainty ? object is conventionally considered a SNR although its nature is poorly known or not well understood. Note on alt: 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 common names are given.
Remarks: The on-line version on the WWW is searchable and contains much more information on the individual objects. References: Green, D.A., MNRAS, 209, 449 (1984) =1984MNRAS.209..449G Green, D.A., ApSS, 148, 3, (1988) =1988APSS..148....3G Green, D.A., PASP, 103, 209 (1991) =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 (Paper IV).
(End) N. Paul M. Kuin [NASA/ADC] 2-Jul-1996
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