Foreground: LWA1

LWA1 Radio Maps

This is a survey of the radio sky done using the first station of the Long Wavelength Array at nine frequencies between 35 and 80 MHz with spatial resolutions ranging from 4.7° to 2.0°, respectively. The maps cover the sky north of a declination of -40°. A conservative estimate of the calibration accuracy of these maps is in the 15–25 per cent range, in terms of both the resolved structure and the sky-averaged temperature.

Survey Parameters
Frequency (MHz)	Centre frequency (MHz)	Bandwidth (kHz)	Beam sizea (degrees)	Confusion noiseb (Jy beam−1)	Thermal noisec (Jy beam−1)
35	34.979	957	4.8 × 4.5	163	38
38	38.042	957	4.5 × 4.1	130	31
40	40.052	957	4.3 × 3.9	114	27
45	44.933	957	3.8 × 3.5	82	20
50	50.005	957	3.4 × 3.1	62	16
60	59.985	957	2.8 × 2.6	38	10
70	70.007	957	2.4 × 2.2	25	7
74	73.931	957	2.3 × 2.1	22	6
80	79.960	957	2.1 × 2.0	18	5

Notes.^aAssuming natural weighting.

^bCalculated from source counts at 1.49 GHz (Condon 1974; Mitchell & Condon 1985) and scaled to these frequencies using a spectral index of −0.7 (Lane et al. 2014).

^cCalculated assuming a 61-ms integration time and a sky temperature of 2000 K at 74 MHz with a spectral index of −2.5.

More details can be found in:

"The LWA1 Low Frequency Sky Survey", Dowell, J., et al. 2017, MNRAS, 469, 4537, ADS

The LWA1 Low Frequency Sky Survey