First Measurement of the Hubble Constant from a Dark Standard Siren using the Dark Energy Survey Galaxies and the LIGO/Virgo Binary-Black-hole Merger GW170814
- 주제(키워드) catalogs , cosmology: observations , gravitational waves , surveys
- 주제(기타) Astronomy & Astrophysics
- 설명문(일반) [Soares-Santos, M.; Pereira, M. E. S.; Garcia, A.] Brandeis Univ, Dept Phys, Waltham, MA 02453 USA; [Palmese, A.; Annis, J.; Lin, H.; Herner, K.; Allam, S.; Diehl, H. T.; Tucker, D. L.; Buckley-Geer, E.; Drlica-Wagner, A.; Flaugher, B.; Frieman, J.; Gutie
- 등재 SCIE, SCOPUS
- OA유형 Green Published, Green Accepted, Green Submitted
- 발행기관 IOP PUBLISHING LTD
- 발행년도 2019
- URI http://www.dcollection.net/handler/ewha/000000160537
- 본문언어 영어
- Published As http://dx.doi.org/10.3847/2041-8213/ab14f1
초록/요약
We present a multi-messenger measurement of the Hubble constant H-0 using the binary-black-hole merger GW170814 as a standard siren, combined with a photometric redshift catalog from the Dark Energy Survey (DES). The luminosity distance is obtained from the gravitational wave signal detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO)/Virgo Collaboration (LVC) on 2017 August 14, and the redshift information is provided by the DES Year 3 data. Black hole mergers such as GW170814 are expected to lack bright electromagnetic emission to uniquely identify their host galaxies and build an object-by-object Hubble diagram. However, they are suitable for a statistical measurement, provided that a galaxy catalog of adequate depth and redshift completion is available. Here we present the first Hubble parameter measurement using a black hole merger. Our analysis results in H-0 = 75(-32)(+40) km s(-1) Mpc(-1) , which is consistent with both SN Ia and cosmic microwave background measurements of the Hubble constant. The quoted 68% credible region comprises 60% of the uniform prior range [20, 140] km s(-1) Mpc(-1) , and it depends on the assumed prior range. If we take a broader prior of [10, 220] km s(-1) Mpc(-1) , we find H-0 = 78(-24)(+96) km s(-1) Mpc(-1) (57% of the prior range). Although a weak constraint on the Hubble constant from a single event is expected using the dark siren method, a multifold increase in the LVC event rate is anticipated in the coming years and combinations of many sirens will lead to improved constraints on H-0.
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