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Mapping the Galactic Free-Free Foreground via Interstellar Hα Emission

Published online by Cambridge University Press:  26 May 2016

R. J. Reynolds  and
L. M. Haffner
R. J. Reynolds
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706, USA
L. M. Haffner
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706, USA

Abstract

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Recently completed Hα surveys of large portions of the sky can be used to create maps of the free-free intensity distribution at high Galactic latitude that are independent of the spectral fits to the CMB data. This provides an opportunity to test the accuracy of the spectral fitting procedures and to search for other sources of Galactic forground contamination that could be confused spectrally with the free-free, such as spinning dust grains. The Wisconsin Hα Mapper (WHAM) survey has sampled the sky north of declination −30° at about one degree angular resolution and has revealed that, except for a few isolated regions of enhanced emission, δTff (30 GHz) ≲ 30 μK at Galactic latitudes near 15°, decreasing to δTff(30 GHz) ≲ 4 μK at latitudes above 50°. Also in progress are Hα surveys that sample the sky at higher angular resolution.

Type
Part IV: Interpreting CMB Observations
Information
Symposium - International Astronomical Union , Volume 201: New Cosmological Data and the Values of the Fundamental Parameters , 2005 , pp. 116 - 125
Copyright
Copyright © Astronomical Society of the Pacific 2005 

References

Arendt, R. G., et al. 1998, ApJ, 508, 74.Google Scholar
Bennett, C. L. et al. 1992, ApJ, 396, L7.Google Scholar
de Oliveira-Costa, A., Tegmark, M., Devlin, M. J., Haffner, L. M., Herbig, T., Miller, A. D., Page, L. A., Reynolds, R. J. & Tufte, S. L. 2000, ApJ, 542, L5.Google Scholar
Dennison, B., Simonetti, J. H., & Topasna, G. A. 1998, Publ. Astr. Soc. Australia, 15, 147.Google Scholar
Draine, B. T. & Lazarian, A. 1998, ApJ, 494, L19.Google Scholar
Ferrara, A. & Dettmar, R.-J. 1994, ApJ, 427, 155.Google Scholar
Gaustad, J. E., McCullough, P. M. & Van Buren, D. 1996, PASP, 108, 351.CrossRefGoogle Scholar
Gaustad, J. E., Rosing, W. McCullough, P. M. & Van Buren, D. 1998, in IAU Symp. No. 190, 58.Google Scholar
Haffner, L. M. 2000, in Fourth Tetons Summer Conference , eds, Bicay, M. D. & Woodward, C. E., ASP Conference Series, in press.Google Scholar
Haffner, L. M., Reynolds, R. J. & Tufte, S. L. 1998, ApJ, 501, L83.Google Scholar
Haffner, L. M., Reynolds, R. J. & Tufte, S. L. 1999, ApJ, 523, 223.CrossRefGoogle Scholar
Heiles, C., Haffner, L. M. & Reynolds, R. J. 1999, in New Perspectives on the Interstellar Medium , ASP Confreence Series 168, eds., Taylor, A. R., Landecker, T. O. & Joncas, G. (San Francisco:ASP), 211.Google Scholar
Kogut, A. 1997, AJ, 114, 1127.Google Scholar
Lagache, G., Haffner, L. M., Reynolds, R. J. & Tufte, S. L. 2000, A&A, 354, 247.Google Scholar
Marcelin, M., Amram, P., Bartlett, J. G., Valls-Gabaud, D. & Blanchard, A. 1998, A&A, 338, 1.Google Scholar
McCullough, P. R., Gaustad, J. E., Rosing, W. & Van Buren, D. 1999 in Proceedings of The Sloan Summit on Microwave Foregrounds , eds., de Oliveira-Costa, A. & Tegmark, M. (ASP, San Francisco, 1999)Google Scholar
Rand, R. J. 1997, ApJ, 474, 129.CrossRefGoogle Scholar
Reynolds, R. J. 1985, ApJ, 294, 256.Google Scholar
Reynolds, R. J. 1991, in The Interstellar Disk-Halo Connection in Galaxies , IAU Symp. No. 144, ed. Bloemen, H. (Dordrecht:Kluwer), p.67.CrossRefGoogle Scholar
Reynolds, R. J. & Ogden, P. M. 1979, ApJ 229, 942.Google Scholar
Reynolds, R. J. & Tufte, S. L. 1995, ApJ, 439, L17.Google Scholar
Reynolds, R. J., Tufte, S. L., Kung, D. T., McCullough, P. R. & Heiles, C. 1995, ApJ, 448, 715.Google Scholar
Scherb, F. 1981 ApJ, 243, 644.Google Scholar
Schlegel, D. J., Finkbeiner, D. P. & Davis, M. 1998, ApJ, 500, 525.Google Scholar
Tufte, S. L. 1997, PhD Thesis, University of Wisconsin-Madison.Google Scholar
Tufte, S. L., Reynolds, R. J. & Haffner, L. M. 1998, ApJ, 504, 773.Google Scholar
Valls-Gabaud, D. 1998, Publ. Astron. Soc. Australia, 15, 111.Google Scholar
Wakker, B. P. & van Woerden, H. 1997, ARA&A, 35, 217.Google Scholar