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We carried out a large program with the Karl G. Jansky Very Large Array(VLA): "THOR: The HI, OH, Recombination line survey of the Milky Way". Weobserved a significant portion of the Galactic plane in the first quadrant ofthe Milky Way in the 21cm HI line, 4 OH transitions, 19 radio recombinationlines, and continuum from 1 to 2 GHz. In this paper we present a catalog of thecontinuum sources in the first half of the survey (l=14.0-37.9deg andl=47.1-51.2deg, |b|<1.1deg) at a spatial resolution of 10-25", with a spatiallyvarying noise level of ~0.3-1 mJy/beam. The catalog contains ~4400 sources.Around 1200 of these are spatially resolved, and ~1000 are possible artifacts,given their low signal-to-noise ratios. Since the spatial distribution of theunresolved objects is evenly distributed and not confined to the Galacticplane, most of them are extragalactic. Thanks to the broad bandwidth of theobservations from 1 to 2 GHz, we are able to determine a reliable spectralindex for ~1800 sources. The spectral index distribution reveals adouble-peaked profile with maxima at spectral indices of alpha = -1 and alpha =0 , corresponding to steep declining and flat spectra, respectively. Thisallows us to distinguish between thermal and non-thermal emission, which can beused to determine the nature of each source. We examine the spectral index of~300 known HII regions, for which we find thermal emission with spectralindices around alpha = 0. In contrast, supernova remnants (SNR) shownon-thermal emission with alpha = -0.5 and extragalactic objects generally havea steeper spectral index of alpha = -1. Using the spectral index information ofthe THOR survey, we investigate potential SNR candidates. We classify theradiation of four SNR candidates as non-thermal, and for the first time, weprovide strong evidence for the SNR origin of these candidates.

Continuum sources from the THOR survey between 1 and 2 GHz