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High-Latitude Galactic Emission in the COBE Differential Microwave Radiometer 2 Year Sky Maps
Abstract
We cross-correlate the COBE6 DMR 2 year sky maps with spatial templates from long-wavelength radio surveys and the far-infrared COBE DIRBE maps. We place an upper limit on the spectral index of synchrotron radiation βsynch < -2.9 between 408 MHz and 31.5 GHz. We obtain a statistically significant cross-correlation with the DIRBE maps, whose dependence on the DMR frequencies indicates a superposition of dust and free-free emission. The high-latitude dust emission (|b| > 30°) is well fitted by a single dust component with temperature T = 18+3-7 K and emissivity ν ∝ (υ/ν0)β with β = 1.9+3.0-0.5. The free-free emission is spatially correlated with the dust on angular scales larger than the 70 DMR beam, with rms variations 5.3±1.8 μK at 53 GHz and angular power spectrum p ∝ l-3. If this correlation persists to smaller angular scales, free-free emission should not be a significant contaminant to measurements of the cosmic microwave anisotropy at degree angular scales for frequencies above 20 GHz.
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Cited by
Schlegel, D. J., Finkbeiner, D. P., & Davis, M. (1998) · The Astrophysical Journal · doi:10.1086/305772 · Cited by 15,126
Draine, B. T. (2003) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.41.011802.094840 · Cited by 2,389
Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Polarization Analysis
Page, L., Hinshaw, G., Komatsu, E., Nolta, M. R., Spergel, D. N., Bennett, C. L., Barnes, C., Bean, R., Dore, O., Dunkley, J., et al. (2007) · The Astrophysical Journal Supplement Series · doi:10.1086/513699 · Cited by 1,380
Self-citationDunne, L., Eales, S., Edmunds, M., Ivison, R., Alexander, P., & Clements, D. L. (2000) · Monthly Notices of the Royal Astronomical Society · doi:10.1046/j.1365-8711.2000.03386.x · Cited by 532
Le Fèvre, O., Cassata, P., Cucciati, O., Garilli, B., Ilbert, O., Le Brun, V., Maccagni, D., Moreau, C., Scodeggio, M., Tresse, L., et al. (2013) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201322179 · Cited by 408
Metadata
- Authors
- Kogut, A., Banday, A. J., Bennett, C. L., Gorski, K. M., Hinshaw, G., & Reach, W. T.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1996-03
- Volume
- 460
- Pages
- 1
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2050115492
- Cited by
- 371
- References
- 0
- FWCI
- 23.93
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: High-Latitude Galactic Emission in the COBE Differential Microwave Radiometer 2 Year Sky Maps. https://app.cochat.ai/papers/10.1086/176947
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- Kogut, A., Banday, A. J., Bennett, C. L., Gorski, K. M., Hinshaw, G., & Reach, W. T. (1996). High-Latitude Galactic Emission in the COBE Differential Microwave Radiometer 2 Year Sky Maps. The Astrophysical Journal. https://doi.org/10.1086/176947
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