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- · arXiv e-print (arXiv:1307.2638)
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| Title: |
| Determining the Hubble constant from gravitational wave observations of merging compact binaries |
| Authors: |
| Nissanke, Samaya; Holz, Daniel E.; Dalal, Neal; Hughes, Scott A.; Sievers, Jonathan L.; Hirata, Christopher M. |
| Publication: |
| eprint arXiv:1307.2638 |
| Publication Date: |
| 07/2013 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics
- Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy
Astrophysical Phenomena, General Relativity and Quantum Cosmology |
| Comment: |
| To be submitted to ApJ, 8 pages in emulateapj format, 1 table, 2 figures |
| Bibliographic Code: |
| 2013arXiv1307.2638N |
Abstract
Recent observations have accumulated compelling evidence that some short
gamma-ray bursts (SGRBs) are associated with the mergers of neutron star
(NS) binaries. This would indicate that the SGRB event is associated
with a gravitational-wave (GW) signal corresponding to the final
inspiral of the compact binary. In addition, the radioactive decay of
elements produced in NS binary mergers may result in transients visible
in the optical and infrared with peak luminosities on hours-days
timescales. Simultaneous observations of the
inspiral GWs and signatures
in the electromagnetic band may allow us to directly and independently
determine both the luminosity distance and
redshift to a binary. These
standard sirens (the GW analog of standard candles) have the potential
to provide an accurate measurement of the low-
redshift Hubble flow. In
addition, these systems are absolutely calibrated by general relativity,
and therefore do not experience the same set of astrophysical
systematics found in traditional standard candles, nor do the
measurements rely on a distance ladder. We show that 15 observable GW
and EM events should allow the Hubble constant to be measured with 5%
precision using a network of detectors that includes
advanced LIGO and
Virgo. Measuring 30 beamed GW-SGRB events could constrain H_0 to better
than 1%. When
comparing to standard Gaussian likelihood analysis, we
find that each event's non-Gaussian posterior in H_0 helps reduce the
overall measurement errors in H_0 for an ensemble of NS binary mergers.
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