G54.1+0.3
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| Supernova remnant | |
|---|---|
 | |
| Observation data: J2000 epoch | |
| Right ascension | 19h 30m 10.6s[1] |
| Declination | +18° 50′ 22″[1] |
| Designations | PSR J1930+1852 |
SNR G054.1+00.3, also called G54.1+0.3, 2E 4258 and 2E 1928.3+1846[1] is a supernova remnant located in the constellation Sagitta. It was identified as a supernova remnant in a study of the galactic plane in the radio continuum at wavelengths of 21 and 11 cm.[2]
SNR G054.1+00.3 is identified as a supernova remnant by its non-thermal radio emission with strong linear polarization. It has a small angular radius (1.5 arcminutes) in radio and X-ray images. Its X-ray emission has been detected with the Einstein, ASCA, ROSAT and Chandra telescopes. In this region of the electromagnetic spectrum it presents different structures that include a ring, an outer nebula and a pulsar, called PSR J1930+1852.[3] The period of this pulsar is 136 ms and it emits very high energy gamma rays. There is a nebula caused by the stellar wind coming from it (PWN).[3]
CO observations show that there is no interaction between SNR G054.1+00.3 and the surrounding clouds and that it instead appears to be located within a bubble. Likewise, in a study carried out in the infrared region at 21 μm, features similar to those observed in Cassiopeia A appear, probably attributable to SiO2 grains. Recently formed cold dust (with a temperature of only 27 - 44 K) has also been detected.[3]
Various models that consider the amount of dust and its composition suggest that the progenitor star was part of a massive star cluster and had a mass of 15 - 20 solar masses[4] or 16 - 27 solar masses.[5]