Numerical simulation of sky localization for LISA-TAIJI joint observation
Numerical simulation of sky localization for LISA-TAIJI joint observation
复制标题
LISA-TAIJI联合观测天空定位数值模拟
DOI：
10.1103/physrevd.102.024089
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发表时间：
2020-07-31
影响因子：
5
通讯作者：
Zhong, Xing-Yu
中科院分区：
文献类型：
--
作者：
Wang, Gang;Ni, Wei-Tou;Zhong, Xing-Yu
LISA is considered to be launched alongside the Athena to probe the energetic astrophysical processes. LISA can determine the direction of sources for Athena's follow-up observation. As another space gravitational wave mission, TAIJI is expected to be launched in the 2030s. The LISA-TAIJI network would provide abundant merits for sources understanding. In this work, we simulate the joint LISA-TAIJI observations for gravitational waves from coalescing supermassive black hole binaries and monochromatic sources. By using the numerical mission orbits, we evaluate the performances of sky localization for various time-delay interferometry channels. For 30 days observation until coalescence, the LISA-TAIJI network in optimal operation can localize all simulated binary sources, $({10}^{7},3.3\ifmmode\times\else\texttimes\fi{}{10}^{6}){M}_{\ensuremath{\bigodot}}$, $({10}^{6},3.3\ifmmode\times\else\texttimes\fi{}{10}^{5}){M}_{\ensuremath{\bigodot}}$, and $({10}^{5},3.3\ifmmode\times\else\texttimes\fi{}{10}^{4}){M}_{\ensuremath{\bigodot}}$ at redshift $z=2$, in $0.4\text{ }\text{ }{\mathrm{deg}}^{2}$ (field of view of Wide Field Imager on Athena). The angular resolution can be improved by more than ten times comparing to LISA or TAIJI single detector at a given percentage of population. The improvements for monochromatic sources at 3 and 10 mHz are relatively moderate in one year observation. The precision of sky localization could be improved by a factor of 2 to 4 comparing to single LISA at a given percentage of sources. For a simulated 90 days observation for monochromatic waves, the LISA-TAIJI network still represents a considerable localization advantage which could be more than ten times better.
LISA is considered to be launched alongside the Athena to probe the energetic astrophysical processes. LISA can determine the direction of sources for Athena's follow-up observation. As another space gravitational wave mission, TAIJI is expected to be launched in the 2030s. The LISA-TAIJI network would provide abundant merits for sources understanding. In this work, we simulate the joint LISA-TAIJI observations for gravitational waves from coalescing supermassive black hole binaries and monochromatic sources. By using the numerical mission orbits, we evaluate the performances of sky localization for various time-delay interferometry channels. For 30 days observation until coalescence, the LISA-TAIJI network in optimal operation can localize all simulated binary sources, $({10}^{7},3.3\ifmmode\times\else\texttimes\fi{}{10}^{6}){M}_{\ensuremath{\bigodot}}$, $({10}^{6},3.3\ifmmode\times\else\texttimes\fi{}{10}^{5}){M}_{\ensuremath{\bigodot}}$, and $({10}^{5},3.3\ifmmode\times\else\texttimes\fi{}{10}^{4}){M}_{\ensuremath{\bigodot}}$ at redshift $z=2$, in $0.4\text{ }\text{ }{\mathrm{deg}}^{2}$ (field of view of Wide Field Imager on Athena). The angular resolution can be improved by more than ten times comparing to LISA or TAIJI single detector at a given percentage of population. The improvements for monochromatic sources at 3 and 10 mHz are relatively moderate in one year observation. The precision of sky localization could be improved by a factor of 2 to 4 comparing to single LISA at a given percentage of sources. For a simulated 90 days observation for monochromatic waves, the LISA-TAIJI network still represents a considerable localization advantage which could be more than ten times better.