Background:

Understanding diffuse Galactic emission is interesting both in its own right and for minimizing foreground contamination of cosmological measurements. The Cosmic Microwave Background experiments have focused on frequencies greater than 10 GHz, whereas 21 cm tomography of the high redshift universe will mainly focus on frequencies lower than 0.2 GHz, where less is currently known about Galactic emission.

Motivated by this, we present a Global Sky Model (GSM) derived from all publicly available unpolarized large-area radio surveys, digitized with optical character recognition when necessary and compiled into a uniform format. Both our data compilation and our software returning a predicted all-sky map at any frequency from 10 MHz to 100 GHz can be downloaded below.

GSM:

Please click here to download the (114 MB) data and software for a global sky model that predicts the diffuse Galactic emission an any frequency of your choice between 10 MHz and 100 GHz. The model is based in a principal component analysis of the 5 WMAP maps and radio maps at 6 frequencies between 10 MHz and 2326 MHz, and is typically accurate to between 1% and 10% depending on frequency and sky region. The output map is in Galactic coordinates, pixelized using the Healpix RING scheme with resolution nside=512, in antenna temperature and at 5.1 degree resolution. At lower frequencies, one can get a higher resolution (1 degree) maps by using the GSM version locked to the Haslam map; while for applications at CMB frequencies, using the version locked to the WMAP 23 GHz map gives maps at 2 degree resolution. Details are presented in arXiv:0802.1525

Data used in our analysis:

When using any of the files listed below, please cite the correspondent reference listed in Table 1. In order to access the data, just click on the map and/or the book figure. If you want the HEALPix version of the tabulated data, please send us an email with your request. Some of these surveys can also be found in the MPIfR's Survey Sampler.

Data		Frequency	FWHM	RA	DEC	Observatory	References
		[GHz]	[deg]	[h]	[deg]
		0.010	2.6x1.9	00 - 16	-06,+74	DRAO, CAN	Caswell 1976
		0.013	53x12	00 - 24	16;35;52;69	ENG	Bridle 1967
		0.017	12x17	00 - 24	16;35;52;69	ENG	Bridle 1967
		0.022	1.1x1.7	00 - 24	-28,+80	DRAO, CAN	Roger et al. 1999
		0.026	15x44	00 - 24	20;40;60	ENG	Turtle et al. 1962
		0.035	0.4x0.7	00 - 24	-30,+60	GEETEE, IND	Dwarakanath et al. 1990
		0.038	15x44	00 - 24	20;40;60	ENG	Turtle et al. 1962
		0.045	5.0	00 - 24	-90,+65	CHL, JPN	Alvarez et al. 1997; Maeda et al. 1999
		0.081	12x17	00 - 24	16;25;30;35;40;52;69	ENG	Bridle 1967
		0.085	3.8x3.5	00 - 24	-25,+25	Parkes, AUS	Landecker & Wielebinski 1970
		0.150	2.2	00 - 24	-25,+25	Parkes, AUS	Landecker & Wielebinski 1970
		0.176	15x44	00 - 24	20;40;60	ENG	Turtle et al. 1962
		0.400	8.5x6.5	00 - 24	20;40;60	ENG	Turtle et al. 1962
		0.404	7.5	00 - 24	-20,+90	ENG	Pauliny-Toth & Shakeshaft 1962
		0.408	0.8	00 - 24	-90,+90	GER, AUS, ENG	Haslam et al. 1982
		0.820	1.2	00 - 24	-07,+85	Dwingeloo, NLD	Berkhuijsen 1972
		1.420	0.6	00 - 24	-90,+90	Stockert, GER	Reich & Reich 1986; Reich et al. 2001
		2.326	0.3	00 - 24	-83,+32	Hartebeesthoek, ZAF	Jonas et al. 1998
		23	0.88	00 - 24	-90,+90	WMAP 3yr	de Oliveira-Costa & Tegmark 2006
		33	0.66	00 - 24	-90,+90	WMAP 3yr	de Oliveira-Costa & Tegmark 2006
		41	0.51	00 - 24	-90,+90	WMAP 3yr	de Oliveira-Costa & Tegmark 2006
		61	0.35	00 - 24	-90,+90	WMAP 3yr	de Oliveira-Costa & Tegmark 2006
		94	0.22	00 - 24	-90,+90	WMAP 3yr	de Oliveira-Costa & Tegmark 2006
		23	0.88	00 - 24	-90,+90	WMAP 5yr	WMAP 5yr Foreground Map
		33	0.66	00 - 24	-90,+90	WMAP 5yr	WMAP 5yr Foreground Map
		41	0.51	00 - 24	-90,+90	WMAP 5yr	WMAP 5yr Foreground Map
		61	0.35	00 - 24	-90,+90	WMAP 5yr	WMAP 5yr Foreground Map
		94	0.22	00 - 24	-90,+90	WMAP 5yr	WMAP 5yr Foreground Map
			0.22	00 - 24	-90,+90	WMAP 5yr	WMAP 5yr Cleaned Map