The kinetic Sunyaev-Zel'dovich effect due to the electrons of our Galaxy

被引:5
作者
Hajian, Amir [1 ,2 ]
Hernandez-Monteagudo, Carlos [3 ]
Jimenez, Raul [3 ]
Spergel, David [2 ]
Verder, Licia [3 ]
机构
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[3] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
关键词
cosmic microwave background; Galaxy : kinematics and dynamics;
D O I
10.1086/522582
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We compute the effect of local electrons on the CMB temperature anisotropies. 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 (similar to 2 mu K) 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.
引用
收藏
页码:1079 / 1083
页数:5
相关论文
共 12 条
[1]   The outer rotation curve of the Milky Way [J].
Binney, J ;
Dehnen, W .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 287 (01) :L5-L7
[2]  
Binney J., 1998, PR S ASTROP
[3]  
BRAND J, 1993, ASTRON ASTROPHYS, V275, P67
[4]  
CORDES JM, 2002, ASTROPH0207156
[5]   HEALPix:: A framework for high-resolution discretization and fast analysis of data distributed on the sphere [J].
Górski, KM ;
Hivon, E ;
Banday, AJ ;
Wandelt, BD ;
Hansen, FK ;
Reinecke, M ;
Bartelmann, M .
ASTROPHYSICAL JOURNAL, 2005, 622 (02) :759-771
[6]  
Hajian A., 2007, ASTROPH0702723
[7]   Three-year Wilkinson Microwave Anisotropy Probe (WMAP1) observations:: Temperature analysis [J].
Hinshaw, G. ;
Nolta, M. R. ;
Bennett, C. L. ;
Bean, R. ;
Dore, O. ;
Greason, M. R. ;
Halpern, M. ;
Hill, R. S. ;
Jarosik, N. ;
Kogut, A. ;
Komatsu, E. ;
Limon, M. ;
Odegard, N. ;
Meyer, S. S. ;
Page, L. ;
Peiris, H. V. ;
Spergel, D. N. ;
Tucker, G. S. ;
Verde, L. ;
Weiland, J. L. ;
Wollack, E. ;
Wright, E. L. .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2007, 170 (02) :288-334
[8]   CMB B-mode polarization from Thomson scattering in the local universe -: art. no. 063531 [J].
Hirata, CM ;
Loeb, A ;
Afshordi, N .
PHYSICAL REVIEW D, 2005, 71 (06) :1-10
[9]   COBE ANISOTROPY FROM SUPERCLUSTER GAS [J].
HOGAN, CJ .
ASTROPHYSICAL JOURNAL, 1992, 398 (02) :L77-L80