Access to Astronomical Catalogues

J/MNRAS/329/775     330MHz flux of 4 SNR near Galactic Centre       (Roy+, 2002)
GMRT observations of four suspected supernova remnants near the Galactic Centre.
    Roy S., Rao A.P.
   <Mon. Not. R. Astron. Soc. 329, 775 (2002)>
   =2002MNRAS.329..775R
ADC_Keywords: Supernova remnants ; Radio sources

Keywords: ISM: individual: G3.1-0.6 - ISM: individual: G356.3-0.3 -
          ISM: individual: G356.6+0.1 - ISM: individual: G357.1-0.2 -
          supernova remnants - Galaxy centre

Abstract:
    We have observed two fields - Field I (l=3.2°, b=1.0°) and
    Field II (l=356.8°, b=-0.1°) - with the Giant Metrewave Radio
    Telescope (GMRT) at 330MHz. In the first field, we have studied the
    candidate supernova remnant (SNR) G3.1-0.6 and, based on its observed
    morphology, spectral index and polarization, confirmed it to be an
    SNR. We find this supernova to have a double ring appearance with a
    strip of emission on its western side passing through its centre. We
    have discovered two extended curved objects in the second field, which
    appears to be part of a large shell-like structure. It is possibly the
    remains of an old supernova in the region. Three suspected SNRs,
    G356.3-0.3, G356.6+0.1 and G357.1-0.2, detected in the MOST 843-MHz
    survey of the GC region appear to be located on this shell-like
    structure. While both G356.3-0.3 and G356.6+0.1 seem to be parts of
    this shell, G357.1-0.2, which has a steeper spectrum above 1GHz, could
    be a background SNR seen through the region. Our Hi absorption
    observation towards the candidate SNR G357.1-0.2 indicates that it is
    at a distance of more than 6kpc from us.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table4.dat        78       44   Compact sources in the field centred on G3.2-1.0
table5.dat        84       23   Compact sources in the field centred on G356.8-0.1


Table 1: Details of our observations
--------------------------------------------------------------------------------
 Galactic coord.     RA  (J2000)  DE   Frequency     Date     Obs.     Available
 pointing center                         (MHz)               Time (h)  antennas
--------------------------------------------------------------------------------
 003.2-0.1        17 57 00.1  -26 40 01   330     1999 Jun 25     6         27
 356.8-0.1        17 38 11.4  -31 42 26   330     1999 Aug 01     3.5       24
 357.2-0.2        17 39 40.6  -31 28 01  1420.6   2000 Feb 26     3.5       15
 356.9+0.1        17 37 44.2  -31 31 15  1420.3   2000 Oct 07     0.5       26

Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label     Explanations

   1- 13  A13   ---     [RR2002]  Object Galactic coordinates
  15- 16  I2    h       RAh       Right ascension (J2000.0)
  18- 19  I2    min     RAm       Right ascension (J2000.0)
  21- 24  F4.1  s       RAs       Right ascension (J2000.0)
      26  A1    ---     DE-       Declination sign (J2000.0)
  27- 28  I2    deg     DEd       Declination (J2000.0)
  30- 31  I2    arcmin  DEm       Declination (J2000.0)
  33- 34  I2    arcsec  DEs       Declination (J2000.0)
  36- 40  F5.3  Jy      Peak      Peak flux at 330MHz (in Jy/beam)
  42- 46  F5.3  Jy      S0.33GHz  Total flux density at 330MHz
      48  A1    ---    l_S1.4GHz  Limit flag on S1.4GHz
  49- 54  F6.4  Jy      S1.4GHz   Total flux density at 1.4GHz
  57- 61  F5.2  arcmin  Dist      Distance from center (G3.2-1.0)
  63- 78  A16   ---     Com       Comments (G1)


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1- 13  A13   ---     [RR2002]  Object Galactic coordinates
  15- 16  I2    h       RAh       Right ascension (J2000.0)
  18- 19  I2    min     RAm       Right ascension (J2000.0)
  21- 24  F4.1  s       RAs       Right ascension (J2000.0)
      26  A1    ---     DE-       Declination sign (J2000.0)
  27- 28  I2    deg     DEd       Declination (J2000.0)
  30- 31  I2    arcmin  DEm       Declination (J2000.0)
  33- 34  I2    arcsec  DEs       Declination (J2000.0)
  36- 40  F5.3  Jy      Peak      Peak flux at 330MHz (in Jy/beam)
  42- 46  F5.3  Jy      S0.33GHz  Total flux density at 330MHz
      48  A1    ---    l_S1.4GHz  Limit flag on 1.4GHz
  49- 54  F6.4  Jy      S1.4GHz   Total flux density at 1.4GHz
  55- 58  A4    ---    n_S1.4GHz  [(NV) ] NV: 1.4-GHz flux quoted from the NVSS
  61- 67  F7.4  Jy      S5GHz     ? Flux density at 5GHz (G356.8-0.1)
  69- 73  F5.2  arcmin  Dist      Distance from center
  75- 84  A10   ---     Com       Comments (G1)


Global notes:

Note (G1): TX denotes flux as measured by the Texas Survey at 365MHz.
           NV denotes flux at 1.4GHz from the NVSS


History:
    From electronic version of the journal
(End)                         James Marcout, Patricia Bauer [CDS]    22-Mar-2002