NGC 4993
| NGC 4993 | |
|---|---|
| Observation data | |
| Constellation | Hydra |
| Right ascension | 13h 09m 47.2s |
| Declination | −23° 23′ 4″ |
| Characteristics | |
| Type | galaxy, E/S0 |
NGC 4993 (also catalogued as NGC 4994) is an elliptical galaxy in the constellation Hydra, discovered in 1789 by Wilhelm Herschel[1]. In August 2017, astronomers reported[2] that a gamma-ray burst, named GRB 170817A, that may have been emitted in the collision of two neutron stars, was detected and observed in this galaxy; a rumored[3] possible new kind of gravitational wave[4], tentatively named GW170817, might also have been detected, which could have been a result of this collision.
References
- ^ "NGC 4993". Deep Sky Observer's Companion. Retrieved 28 August 2017.
- ^ Drake, Nadia (25 August 2017). "Strange Stars Caught Wrinkling Spacetime? Get the Facts". National Geographic (magazine). Retrieved 28 August 2017.
- ^ Casttelvecchi, Davide (25 August 2017). "Rumours swell over new kind of gravitational-wave sighting". Nature. doi:10.1038/nature.2017.22482. Retrieved 27 August 2017.
- ^ McKinnon, Mika (23 August 2017). "Exclusive: We may have detected a new kind of gravitational wave". New Scientist. Retrieved 28 August 2017.
External links
- "NGC 4993". SIMBAD. Retrieved 28 August 2017.
{{cite web}}: Cite has empty unknown parameters:|trans_title=,|day=,|month=, and|deadurl=(help) - "NGC 4993". DSO Browser. Retrieved 28 August 2017.
{{cite web}}: Cite has empty unknown parameters:|trans_title=,|day=,|month=, and|deadurl=(help) - Courtney Seligman. "New General Catalog Objects: NGC 4950 - 4999". Retrieved 28 August 2017.
{{cite web}}: Cite has empty unknown parameters:|trans_title=,|day=,|month=, and|deadurl=(help) - Hartmut Frommert. "Revised NGC Data for NGC 4993". SEDS. Retrieved 28 August 2017.
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