期刊
SCIENCE
卷 358, 期 6370, 页码 1565-1569出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aap9580
关键词
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资金
- UK Space Agency
- Leverhulme Trust Early Career Fellowship
- NASA [NAS5-00136, NNG08FD60C]
- ASI-INAF [I/004/11/3]
- Swedish Research Council (VR) [2016-03657_3]
- Swedish National Space Board [107/16]
- research environment grant Gravitational Radiation and Electromagnetic Astrophysical Transients (GREAT) - Swedish Research council (VR) [2016-06012]
- U.S. Department of Energy National Nuclear Security Administration [DE-AC52-06NA25396]
- European Southern Observatory program [099.D-0668]
- European Research Council under the European Union [725246]
- National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396]
- Science and Technology Facilities Council studentship
- STFC [ST/N000757/1, ST/H001972/1, ST/P000495/1, ST/L000733/1, ST/N000811/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/P000495/1, ST/L000733/1] Funding Source: researchfish
- UK Space Agency [ST/P002196/1] Funding Source: researchfish
- European Research Council (ERC) [725246] Funding Source: European Research Council (ERC)
With the first direct detection of merging black holes in 2015, the era of gravitational wave (GW) astrophysics began. A complete picture of compact object mergers, however, requires the detection of an electromagnetic (EM) counterpart. We report ultraviolet (UV) and x-ray observations by Swift and the Nuclear Spectroscopic Telescope Array of the EM counter part of the binary neutron star merger GW170817. The bright, rapidly fading UV emission indicates a high mass (approximate to 0.03 solar masses) wind-driven outflow with moderate electron fraction (Y-e approximate to 0.27). Combined with the x-ray limits, we favor an observer viewing angle of approximate to 30 degrees away from the orbital rotation axis, which avoids both obscuration from the heaviest elements in the orbital plane and a direct view of any ultrarelativistic, highly collimated ejecta (a gamma-ray burst afterglow).
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