TY - JOUR
T1 - Antisymmetric cross-correlation of line-intensity maps as a probe of reionization
AU - Sato-Polito, Gabriela
AU - Bernal, José Luis
AU - Kovetz, Ely D.
AU - Kamionkowski, Marc
N1 - Funding Information:
We acknowledge Yi Mao for suggesting the 21-cm–CO antisymmetric cross-correlation as an EoR probe in his talk at the 2019 LIM conference held at the CCA, NYC. We thank Patrick C. Breysse and Dongwoo T. Chung for useful discussions. This work was supported at Johns Hopkins by NASA Grant No. NNX17AK38G, NSF Grant No. 1818899, and the Simons Foundation. J. L. B. was supported by the Allan C. and Dorothy H. Davis Fellowship. E. D. K. was supported by a Faculty Fellowship from the Azrieli Foundation.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/8/15
Y1 - 2020/8/15
N2 - We present a new estimator for the cross-correlation signal between line-intensity maps to probe the epoch of reionization. The proposed estimator is the hitherto neglected antisymmetric component of the cross-correlation, under the exchange of line-of-sight positions. We consider the cross-correlation between neutral hydrogen and carbon monoxide fluctuations and forecast the improvement in precision on reionization parameters when the antisymmetric contribution is accounted for. As a way to break the degeneracy between astrophysics and cosmology in the intensity mapping power spectrum, we study the ratio between the antisymmetric and symmetric components. While our results depend on the highly uncertain astrophysical modeling, we show that in most standard scenarios including the antisymmetric contribution as a complementary probe can lead to a significant gain in information.
AB - We present a new estimator for the cross-correlation signal between line-intensity maps to probe the epoch of reionization. The proposed estimator is the hitherto neglected antisymmetric component of the cross-correlation, under the exchange of line-of-sight positions. We consider the cross-correlation between neutral hydrogen and carbon monoxide fluctuations and forecast the improvement in precision on reionization parameters when the antisymmetric contribution is accounted for. As a way to break the degeneracy between astrophysics and cosmology in the intensity mapping power spectrum, we study the ratio between the antisymmetric and symmetric components. While our results depend on the highly uncertain astrophysical modeling, we show that in most standard scenarios including the antisymmetric contribution as a complementary probe can lead to a significant gain in information.
UR - http://www.scopus.com/inward/record.url?scp=85092481333&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.102.043519
DO - 10.1103/PhysRevD.102.043519
M3 - Article
AN - SCOPUS:85092481333
VL - 102
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 4
M1 - 043519
ER -