A MILLIMETER-WAVE GALACTIC PLANE SURVEY WITH THE BICEP POLARIMETER

被引：18

作者：

Bierman, E. M. ^{[1
]}

Matsumura, T. ^{[2
]}

Dowell, C. D. ^{[2
]}

Keating, B. G. ^{[1
]}

Ade, P. ^{[3
]}

Barkats, D.

Barron, D. ^{[1
]}

Battle, J. O.

Bock, J. J. ^{[2
]}

Chiang, H. C. ^{[2
,4
]}

Culverhouse, T. L. ^{[2
]}

Duband, L.

Hivon, E. F. ^{[5
]}

Holzapfel, W. L. ^{[6
]}

Hristov, V. V. ^{[2
]}

Kaufman, J. P. ^{[1
]}

Kovac, J. M. ^{[2
,7
]}

Kuo, C. L. ^{[8
]}

Lange, A. E. ^{[2
]}

Leitch, E. M.

Mason, P. V. ^{[2
]}

Miller, N. J. ^{[1
]}

Nguyen, H. T.

Pryke, C. ^{[9
]}

Richter, S. ^{[2
]}

Rocha, G. M. ^{[2
]}

Sheehy, C. ^{[9
]}

Takahashi, Y. D. ^{[6
]}

Yoon, K. W.

机构：

[1] Univ Calif San Diego, San Diego, CA 92103 USA

[2] CALTECH, Pasadena, CA 91125 USA

[3] Univ Wales Coll Cardiff, Cardiff CF1 3NS, S Glam, Wales

[4] Princeton Univ, Princeton, NJ 08544 USA

[5] Inst Astrophys Paris, Paris, France

[6] Univ Calif Berkeley, Berkeley, CA 94720 USA

[7] Harvard Univ, Cambridge, MA 02138 USA

[8] Stanford Univ, Stanford, CA 94305 USA

[9] Univ Chicago, Chicago, IL 60637 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 741卷 / 02期

关键词：

cosmology: observations; Galaxy: structure; instrumentation: polarimeters; radio continuum: ISM; submillimeter: diffuse background; submillimeter: ISM; PROBE WMAP OBSERVATIONS; MICROWAVE BACKGROUND POLARIZATION; MAGNETIC-FIELDS; COMPONENT SEPARATION; DUST EMISSION; POWER SPECTRA; STATISTICAL PROPERTIES; INFRARED POLARIMETRY; INTERSTELLAR DUST; CLOUDS;

D O I：

10.1088/0004-637X/741/2/81

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In order to study inflationary cosmology and the Milky Way Galaxy's composition and magnetic field structure, Stokes I, Q, and U maps of the Galactic plane covering the Galactic longitude range 260 degrees < l < 340 degrees in three atmospheric transmission windows centered on 100, 150, and 220 GHz are presented. The maps sample an optical depth 1 less than or similar to A(V) <= 30, and are consistent with previous characterizations of the Galactic millimeter-wave frequency spectrum and the large-scale magnetic field structure permeating the interstellar medium. The polarization angles in all three bands are generally perpendicular to those measured by starlight polarimetry as expected and show changes in the structure of the Galactic magnetic field on the scale of 60 degrees. The frequency spectrum of degree-scale Galactic emission is plotted between 23 and 220 GHz (including WMAP data) and is fit to a two-component (synchrotron and dust) model showing that the higher frequency BICEP data are necessary to tightly constrain the amplitude and spectral index of Galactic dust. Polarized emission is detected over the entire region within two degrees of the Galactic plane, indicating the large-scale magnetic field is oriented parallel to the plane of the Galaxy. A trend of decreasing polarization fraction with increasing total intensity is observed, ruling out the simplest model of a constant Galactic magnetic field orientation along the line of sight in the Galactic plane. A generally increasing trend of polarization fraction with electromagnetic frequency is found, varying from 0.5%-1.5% at frequencies below 50 GHz to 2.5%-3.5% above 90 GHz. The effort to extend the capabilities of BICEP by installing 220 GHz band hardware is described along with analysis of the new band.

引用

页数：21

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