ANALYSIS OF WMAP 7 YEAR TEMPERATURE DATA: ASTROPHYSICS OF THE GALACTIC HAZE

Journal Article · Fri Aug 10 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/755/1/69· OSTI ID:22039140

Pietrobon, Davide; Gorski, Krzysztof M; Bartlett, James; Colombo, Loris P. L.; Jewell, Jeffrey B; Pagano, Luca; Rocha, Graca; Lawrence, Charles R ^[1]; Banday, A J ^[2]; Dobler, Gregory ^[3]; Hildebrandt, Sergi R ^[4]; Eriksen, Hans Kristian ^[5]; Saha, Rajib ^[6]

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1. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 (United States)
2. Universie de Toulouse, UPS-OMP, IRAP, Toulouse (France)
3. Kavli Institute for Theoretical Physics, University of California, Santa Barbara Kohn Hall, Santa Barbara, CA 93106 (United States)
4. Division of Physics, Mathematics and Astronomy, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
5. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, N-0315 Oslo (Norway)
6. Physics Department, Indian Institute of Science Education and Research Bhopal, Bhopal, MP 462023 (India)

We perform a joint analysis of the cosmic microwave background (CMB) and Galactic emission from the WMAP 7 year temperature data. Using the Commander code, based on Gibbs sampling, we simultaneously derive the CMB and Galactic components on scales larger than 1 Degree-Sign with improved sensitivity over previous work. We conduct a detailed study of the low-frequency Galactic foreground, focusing on the 'microwave haze' emission around the Galactic center. We demonstrate improved performance in quantifying the diffuse Galactic emission when including Haslam 408 MHz data and when jointly modeling the spinning and thermal dust emission. We examine whether the hypothetical Galactic haze can be explained by a spatial variation of the synchrotron spectral index, and find that the excess of emission around the Galactic center is stable with respect to variations of the foreground model. Our results demonstrate that the new Galactic foreground component-the microwave haze-is indeed present.

• OSTI ID: 22039140
• Journal Information: Astrophysical Journal, Vol. 755, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COMPUTERIZED SIMULATION
COSMIC DUST
COSMOLOGY
DATA ANALYSIS
INDEXES
MHZ RANGE
MILKY WAY
PERFORMANCE
PHOTON EMISSION
RELICT RADIATION
SAMPLING
SENSITIVITY
VARIATIONS