TY - JOUR
T1 - The kinetic Sunyaev-Zel'dovich effect due to the electrons of our galaxy
AU - Hajian, Amir
AU - Hernández-Monteagudo, Carlos
AU - Jimenez, Raul
AU - Spergel, David
AU - Verde, Licia
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2007/12/20
Y1 - 2007/12/20
N2 - We compute the effect of local electrons on the CMB temperature anisotropics. The number density and distribution of free electrons in our Galaxy has been accurately measured from pulsar dispersion measurements. Because of their distribution, the dynamics of our Galaxy, and the Galaxy peculiar velocity with respect to the Hubble flow, these free electrons leave a frequency-independent imprint on the cosmic microwave background (CMB). In particular, the coherent motion of the free electrons with respect to us and to the CMB rest frame produce a kinetic Sunyaev-Zel'dovich signal. We compute this effect and we note that the large-scale antisymmetry of the signal gives it an angular power spectrum with a sawtooth pattern, where even multipoles are suppressed with respect to the odd ones. We find the signal to be small (&slim2 μK) and subdominant compared to the primary CMB and other foreground signals. However, since the parameters of this model are constrained by other independent astrophysical observations, it can be taken into account if more precise measurements of the primordial signal are required.
AB - We compute the effect of local electrons on the CMB temperature anisotropics. The number density and distribution of free electrons in our Galaxy has been accurately measured from pulsar dispersion measurements. Because of their distribution, the dynamics of our Galaxy, and the Galaxy peculiar velocity with respect to the Hubble flow, these free electrons leave a frequency-independent imprint on the cosmic microwave background (CMB). In particular, the coherent motion of the free electrons with respect to us and to the CMB rest frame produce a kinetic Sunyaev-Zel'dovich signal. We compute this effect and we note that the large-scale antisymmetry of the signal gives it an angular power spectrum with a sawtooth pattern, where even multipoles are suppressed with respect to the odd ones. We find the signal to be small (&slim2 μK) and subdominant compared to the primary CMB and other foreground signals. However, since the parameters of this model are constrained by other independent astrophysical observations, it can be taken into account if more precise measurements of the primordial signal are required.
KW - Cosmic microwave background
KW - Galaxy: kinematics and dynamics
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U2 - 10.1086/522582
DO - 10.1086/522582
M3 - Article
AN - SCOPUS:40249089830
VL - 671
SP - 1079
EP - 1083
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
ER -