VII/253 A Catalogue of Galactic Supernova Remnants (Green, 2009) ================================================================================ A Catalogue of Galactic Supernova Remnants, 2009 March version. Green D.A. =2009BASI...37...45G ================================================================================ 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file snrs.dat 88 274 Supernova Remnant catalogue -------------------------------------------------------------------------------- See also: VII/187 : the 1995 July version which was superseded by this catalogue VII/210 : the 1996 August version which was superseded by this catalogue VII/211 : the 1998 September version which was superseded by this catalogue VII/227 : the 2001 December version which was superseded by this catalogue http://www.mrao.cam.ac.uk/surveys/snrs/ : the on-line version Byte-by-byte Description of file: snrs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------- 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 ================================================================================ (End) Dave Green 09-Jun-2009