Detecting a stochastic gravitational wave background in the presence of a galactic foreground and instrument noise

被引：109

作者：

Adams, Matthew R. ^{[1
]}

Cornish, Neil J. ^{[1
]}

机构：

[1] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA

来源：

PHYSICAL REVIEW D | 2014年 / 89卷 / 02期

关键词：

BLACK-HOLE BINARIES; DOUBLE WHITE-DWARFS; POPULATION SYNTHESIS; LISA; COALESCENCE; SIGNAL;

D O I：

10.1103/PhysRevD.89.022001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Detecting a stochastic gravitational wave background requires that we first understand and model any astrophysical foregrounds. In the millihertz frequency band, the predominate foreground signal will be from unresolved white dwarf binaries in the galaxy. We build on our previous work to show that a stochastic gravitational wave background can be detected in the presence of both instrument noise and a galactic confusion foreground. The key to our approach is accurately modeling the spectra for each of the various signal components. We simulate data for a gigameter Laser Interferometer Space Antenna operating in the millihertz frequency band with both six and four links. We obtain posterior distribution functions for the instrument noise parameters, the galaxy level and modulation parameters, and the stochastic background energy density. We find that we are able to detect a scale-invariant stochastic background with energy density as low as Omega(gw) = 2 x 10(-13) for a six-link interferometer and Omega(gw) = 5 x 10(-13) for a four-link interferometer with one year of data.

引用

页数：10

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