Abstract
As a generalization of our previous work [Phys. Rev. D 95 (2017) 043528], in which an analytic model for the galaxy bispectrum in redshift space was developed on the basis of the halo approach, we here investigate its higher multipoles that have not been known so far. The redshift-space bispectrum includes the two variables ω and φ for the line-of-sight direction, and the higher multipole bispectra are defined by the coefficients in the expansion of the redshift-space bispectrum using the spherical harmonics. We find 6 new nonvanishing components out of 25 total components up to ℓ=4, in addition to 3 components discussed in the previous work (monopole, quadruple, and hexadecapole of m=0). The characteristic behaviors of the new nonvanishing multipoles are compared with the results of galaxy mock catalogs that match the halo occupation distribution of the Sloan Digital Sky Survey Baryonic Oscillation Spectroscopic Survey low-redshift sample. We find that the multipoles with m≠ 0 are also sensitive to redshift-space distortion (RSD) as well as those with m=0 and thus are key ingredients in the RSD analysis using the galaxy bispectrum. Analytic approximation formulas for these nonzero components are also presented; these are useful for understanding the characteristic behaviors.
| Original language | English |
|---|---|
| Article number | 038 |
| Journal | Journal of Cosmology and Astroparticle Physics |
| Volume | 2018 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 17 2018 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
Cite this
Higher multipoles of the galaxy bispectrum in redshift space. / Nan, Yue; Yamamoto, Kazuhiro; Hikage, Chiaki.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2018, No. 7, 038, 17.07.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Higher multipoles of the galaxy bispectrum in redshift space
AU - Nan, Yue
AU - Yamamoto, Kazuhiro
AU - Hikage, Chiaki
PY - 2018/7/17
Y1 - 2018/7/17
N2 - As a generalization of our previous work [Phys. Rev. D 95 (2017) 043528], in which an analytic model for the galaxy bispectrum in redshift space was developed on the basis of the halo approach, we here investigate its higher multipoles that have not been known so far. The redshift-space bispectrum includes the two variables ω and φ for the line-of-sight direction, and the higher multipole bispectra are defined by the coefficients in the expansion of the redshift-space bispectrum using the spherical harmonics. We find 6 new nonvanishing components out of 25 total components up to ℓ=4, in addition to 3 components discussed in the previous work (monopole, quadruple, and hexadecapole of m=0). The characteristic behaviors of the new nonvanishing multipoles are compared with the results of galaxy mock catalogs that match the halo occupation distribution of the Sloan Digital Sky Survey Baryonic Oscillation Spectroscopic Survey low-redshift sample. We find that the multipoles with m≠ 0 are also sensitive to redshift-space distortion (RSD) as well as those with m=0 and thus are key ingredients in the RSD analysis using the galaxy bispectrum. Analytic approximation formulas for these nonzero components are also presented; these are useful for understanding the characteristic behaviors.
AB - As a generalization of our previous work [Phys. Rev. D 95 (2017) 043528], in which an analytic model for the galaxy bispectrum in redshift space was developed on the basis of the halo approach, we here investigate its higher multipoles that have not been known so far. The redshift-space bispectrum includes the two variables ω and φ for the line-of-sight direction, and the higher multipole bispectra are defined by the coefficients in the expansion of the redshift-space bispectrum using the spherical harmonics. We find 6 new nonvanishing components out of 25 total components up to ℓ=4, in addition to 3 components discussed in the previous work (monopole, quadruple, and hexadecapole of m=0). The characteristic behaviors of the new nonvanishing multipoles are compared with the results of galaxy mock catalogs that match the halo occupation distribution of the Sloan Digital Sky Survey Baryonic Oscillation Spectroscopic Survey low-redshift sample. We find that the multipoles with m≠ 0 are also sensitive to redshift-space distortion (RSD) as well as those with m=0 and thus are key ingredients in the RSD analysis using the galaxy bispectrum. Analytic approximation formulas for these nonzero components are also presented; these are useful for understanding the characteristic behaviors.
UR - http://www.scopus.com/inward/record.url?scp=85051745771&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051745771&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2018/07/038
DO - 10.1088/1475-7516/2018/07/038
M3 - Article
AN - SCOPUS:85051745771
VL - 2018
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 7
M1 - 038
ER -