2025ApJ...994..212M

Query : 2025ApJ...994..212M

2025ApJ...994..212M - Astrophys. J., 994, 212 (2025/December-1)

Testing Photometric Techniques for Measuring the Rest-frame UV Spectral Slope against JWST PRISM Spectroscopy.

MORALES A.M., FINKELSTEIN S.L., ARRABAL HARO P., BAGLEY M.B., CALABRO A., CHAVEZ ORTIZ O.A., DAVIS K., DICKINSON M., GAWISER E., GIAVALISCO M., HATHI N.P., HIRSCHMANN M., KARTALTEPE J.S., KOEKEMOER A.M., LONG A.S., LUCAS R.A., PACUCCI F., PAPOVICH C., PAUTASSO B., PIRZKAL N., TAYLOR A.J., DE LA VEGA A., WILKINS S.M. and YUNG L.Y.A.

Abstract (from CDS):

We present a sample of 53 galaxy spectra at zSPEC ∼ 5-12 from the JWST CEERS and RUBIES surveys, combining NIRSpec PRISM spectroscopy with NIRCam photometry. We aim to use these data to establish best practices for measuring the UV spectral slope (β) in the era of JWST. We adopt power-law fits to the rest-frame UV continuum from the spectroscopic data as our fiducial, or “true,” β values, and compare them to photometric estimates derived through three methods: (1) photometric power-law fitting, (2) power-law fitting to a spectral energy distribution (SED) model fitted to the photometry, (3) single-color fitting near the Lyman break, and (4) single-color fitting at fixed rest-frame wavelengths. We find that photometric power-law fitting and SED fitting are comparable and most closely recover the spectroscopic slopes, with minimal bias and scatter. Single-color estimates, while commonly used in past studies, show the most significant deviations and are not recommended when more than a single color is available. Our results highlight the limitations and strengths of each approach and provide practical guidance for measuring β from photometry when spectra are unavailable or are of insufficient quality.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Early universe - Galaxy formation - Galaxy evolution - Astronomical methods - Ultraviolet spectroscopy

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Extended Groth Strip reg 14 19 +52.8           ~ 1023 0

Query : 2025ApJ...994..212M

Basic data :
NAME Extended Groth Strip -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		14 19 00.0 +52 48 00 [ ] E ~
FK4 coord. (ep=B1950 eq=1950) : 		14 17 16.3 +53 01 45 [ ]
Gal coord. (ep=J2000) : 		096.4814 +59.5977 [ ]
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NAME EGS NAME Extended Groth Strip

References (1023 between 1850 and 2026) (Total 1023)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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