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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 78 44 Compact sources in the field centred on G3.2-1.0
table5.dat 82 23 Compact sources in the field centred on G356.8-0.1
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Table 1: Details of our observations
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Galactic coord. RA (J2000) DE Frequency Date Obs. Available
pointing center (MHz) Time (h) antennas
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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
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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)
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Global notes:
Note (G1): TX denotes flux as measured by the Texas Survey at 365MHz.
NV denotes flux at 1.4GHz from the NVSS
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 22-Mar-2002