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J/ApJS/174/379        Optical imaging and spectra of 3C 58        (Fesen+, 2008)
Optical imaging and spectroscopy of the galactic supernova remnant 3C 58
(G130.7+3.1).
    Fesen R., Rudie G., Hurford A., Soto A.
   <Astrophys. J. Suppl. Ser., 174, 379-395 (2008)>
   =2008ApJS..174..379F
ADC_Keywords: Spectroscopy ; Supernova remnants ; Interstellar medium

Keywords: ISM: individual (3C 58) - ISM: kinematics and dynamics
          supernova remnants

Abstract:
    We present a comprehensive imaging and spectroscopic survey of optical
    emission knots associated with the young Galactic supernova remnant
    3C 58. Hα images show hundreds of clumpy filaments and knots
    arranged in a complex structure covering a nearly circular area
    roughly 400" in diameter. A quite different emission structure is seen
    in [OIII], where the brightest features are less clumpy and largely
    confined to the remnant's northwest quadrant. Measured radial
    velocities of over 450 knots reveal two distinct kinematic
    populations; one with average and peak expansion velocities of 770 and
    1100km/s, respectively, forming a thick shell, and the other showing
    |v|≤250km/s. High-velocity knots (|v|≥500km/s) exhibit a strong
    bipolar expansion pattern with redshifted and blueshifted knots
    located in northeastern and southwestern regions, respectively. These
    knots also show strong [NII]/Hα line emission ratios, suggesting
    enhanced N/H. In contrast, the slower expanding knot population shows
    much lower [NII]/Hα line ratios and likely represents
    circumstellar mass loss material from the 3C 58 progenitor.
    Proper-motion estimates using images spanning a 28yr time interval
    suggest positional shifts of between 0.5" and 2.0", implying proper
    motions of 0.02-0.07"/yr. These values agree with previous
    estimates but are much less than the ∼0.2"/yr expected if 3C 58
    were associated with historic guest star of 1181 CE.

Description:
    Interference filter images of 3C 58 were obtained in 1994 September
    using the McGraw-Hill 1.3m telescope at the MDM Observatory at Kitt
    Peak. Low-dispersion, long-slit optical spectra of 3C 58 were 
    obtained on 1995 October 16-23 using the MDM 2.4m telescope.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE         Designation(s)
    ----------------------------------------------------------
    02 05 37.92  +64 49 42.8    3C 58 = SNR G130.7+03.1 
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        82      461   Observed emission knots in 3C 58


See also:
         VII/15 : Galactic Supernova Remnants Catalogue (Ilovaisky+ 1972)
         VII/14 : Galactic Supernova Remnants Catalogue (Clark+ 1976)
        VII/253 : A Catalogue of Galactic Supernova Remnants (Green, 2009)
 J/ApJS/179/195 : A catalogue of outer ejecta knots in Cas A (Hammell+, 2008)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  4  A4    ---    [FRH2008]  Knot identification (NAaa)
       6  I1    h       RAh       Hour of Right Ascension (J2000)
   8-  9  I2    min     RAm       Minute of Right Ascension (J2000)
  11- 15  F5.2  s       RAs       Second of Right Ascension (J2000)
      17  A1    ---     DE-       Declination sign (J2000)
  18- 19  I2    deg     DEd       Degree of Declination (J2000)
  21- 22  I2    arcmin  DEm       Arcminute of Declination (J2000)
  24- 27  F4.1  arcsec  DEs       Arcsecond of Declination (J2000)
  29- 34  F6.1  arcsec  x         Relative x offset (1)
  36- 41  F6.1  arcsec  y         Relative y offset (1)
  43- 47  F5.1  arcsec  r         Radial distance (1)
  49- 53  I5    km/s    RV        Radial velocity
  55- 61  E7.1  mW/m2   FHa       ? Integrated Hα flux
  63- 66  F4.1  ---     NII/Ha    ? [NII]/Hα ratio
  68- 70  F3.1  ---     SIIr      ? [SII]λ6716/S[II]λ6731 ratio
  72- 74  F3.1  ---     OI/Ha     ? [OI]λ6300/Hα ratio
  76- 78  F3.1  ---     SII/Ha    ? [SII]/Hα ratio
  80- 82  F3.1  ---     OIII/Ha   ? [OIII]λ5007/Hα ratio

Note (1): From PSR J0205+6449, 02:05:37.92+64:49:42.8 (J2000.0).



History:
    From electronic version of the journal
(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    17-Sep-2009