The AstroSat UV Deep Field North: the far and near ultraviolet photometric catalog by Chayan Mondal et al. on Wednesday 30 November

We present deep UV imaging observations of the Great Observatories Origins

Survey Northern (GOODS-N) field with AstroSat/UVIT (AstroSat UV Deep Field

north - AUDFn), using one far-UV (F154W, 34.0 kilosec) and two near-UV filters

(N242W, 19.2 kilosec; N245M, 15.5 kilosec). The nature of the UV sky background

was explored across the UVIT field and a global mean and rms was estimated for

each filter. We reach 3$\sigma$ detection limits of $m_{\rm AB}$ $\sim$ 27.35

mag, 27.28 mag and 27.02 mag for a point source in the F154W, N242W and N245M

bands respectively. The 50\% completeness limits of the FUV and NUV images are

$m_{\rm AB}=$ 26.40 mag and 27.05 mag respectively. We constructed PSFs for

each band and estimated their FWHM, which were found to be almost the same:

1.18" in F154W, 1.11" in N242W, and 1.24" in N245M. We used SExtractor to

separately identify sources in the FUV and NUV filters and produce the UV

source catalog of the entire AUDFn field. The source count slope estimated in

FUV and NUV is 0.57 dex mag$^{-1}$ (between 19 - 25 mag) and 0.44 dex

mag$^{-1}$ (between 18 - 25 mag), respectively. The catalog contains 6839 and

16171 sources (brighter than the 50\% completeness limit) in the FUV and NUV,

respectively. Our FUV and NUV flux measurements of the identified sources

complement existing multi-band data in the GOODS-N field, and enable us to

probe rest-frame FUV properties of galaxies at redshift $z < 1$ and search for

candidate Lyman continuum leakers at redshift $z > 0.97$.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.16923v1