Rest-frame UV Colors for Faint Galaxies at z 916 with the JWST NGDEEP Survey uri icon

abstract

  • Abstract We present measurements of the rest-frame UV spectral slope, , for a sample of 36 faint star-forming galaxies at z 916 discovered in one of the deepest JWST NIRCam surveys to date, the Next Generation Deep Extragalactic Exploratory Public Survey. We use robust photometric measurements for UV-faint galaxies (down to M UV 16), originally published in Leung et al., and measure values of the UV spectral slope via photometric power-law fitting to both the observed photometry and stellar population models obtained through spectral energy distribution (SED) fitting with Bagpipes. We obtain a median and 68% confidence interval for from photometric power-law fitting of PL = 2.7 0.5 + 0.5 and from SED fitting, SED = 2.3 0.1 + 0.2 for the full sample. We show that when only two to three photometric detections are available, SED fitting has a lower scatter and reduced biases than photometric power-law fitting. We quantify this bias and find that after correction the median SED , corr = 2.5 0.2 + 0.2 . We measure physical properties for our galaxies with Bagpipes and find that our faint ( M

published proceedings

  • The Astrophysical Journal Letters

author list (cited authors)

  • Morales, A. M., Finkelstein, S. L., Leung, G., Bagley, M. B., Cleri, N. J., Dave, R., ... Yung, L.

complete list of authors

  • Morales, Alexa M||Finkelstein, Steven L||Leung, Gene CK||Bagley, Micaela B||Cleri, Nikko J||Dave, Romeel||Dickinson, Mark||Ferguson, Henry C||Hathi, Nimish P||Jones, Ewan||Koekemoer, Anton M||Papovich, Casey||Pérez-González, Pablo G||Pirzkal, Nor||Smith, Britton||Wilkins, Stephen M||Yung, LY Aaron