Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

JEMS: A deep medium-band imaging survey in the Hubble Ultra-Deep Field with JWST NIRCam & NIRISS

Christina C. Williams, Sandro Tacchella, Michael V. Maseda, Brant E. Robertson, Benjamin D. Johnson, Chris J. Willott, Daniel J. Eisenstein, Christopher N. A. Willmer, Zhiyuan Ji, Kevin N. Hainline, Jakob M. Helton, Stacey Alberts, Stefi Baum, Rachana Bhatawdekar, Kristan Boyett, Andrew J. Bunker, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Emma Curtis-Lake, Anna de Graaf, Eiichi Egami, Marijn Franx, Nimisha Kumari, Roberto Maiolino, Erica J. Nelson, Marcia J. Rieke, Lester Sandles, Irene Shivaei, Charlotte Simmonds, Renske Smit, Katherine A. Suess, Fengwu Sun, Hannah Ubler, Joris Witstok

TL;DR

JEMS presents the first public, medium-band JWST imaging survey in the Hubble Ultra Deep Field, enabling high-resolution spectral sampling of distant galaxies. The survey employs five NIRCam medium-band filters F182M, F210M, F430M, F460M, F480M and parallel NIRISS F430M/F480M to densely sample galaxy SEDs from the rest-frame UV to optical, enabling robust emission-line measurements and refined photometric redshifts. A key result is that medium-band colors with a >1 magnitude excess efficiently identify strong line emitters across $1.5<z<9.3$, notably H$\alpha$+[NII] and [OIII]+H$\beta$, with Paschen-$\alpha$ also accessible. The paper presents the first data release of science-ready mosaics and discusses future data releases, illustrating how JWST medium-band imaging can guide future extragalactic survey strategies.

Abstract

We present JEMS (JWST Extragalactic Medium-band Survey), the first public medium-band imaging survey carried out using JWST/NIRCam and NIRISS. These observations use $\sim2μ$m and $\sim4μ$m medium-band filters (NIRCam F182M, F210M, F430M, F460M, F480M; and NIRISS F430M & F480M in parallel) over 15.6 square arcminutes in the Hubble Ultra Deep Field (UDF), thereby building on the deepest multi-wavelength public datasets available anywhere on the sky. We describe our science goals, survey design, NIRCam and NIRISS image reduction methods, and describe our first data release of the science-ready mosaics. Our chosen filters create a JWST imaging survey in the UDF that enables novel analysis of a range of spectral features potentially across the redshift range of $0.3<z<20$, including Paschen-$α$, H$α$+[NII], and [OIII]+H$β$ emission at high spatial resolution. We find that our JWST medium-band imaging efficiently identifies strong line emitters (medium-band colors $>1$ magnitude) across redshifts $1.5<z<9.3$, most prominently H$α$+[NII] and [OIII]+H$β$. We present our first data release including science-ready mosaics of each medium-band image available to the community, adding to the legacy value of past and future surveys in the UDF. We also describe future data releases. This survey demonstrates the power of medium-band imaging with JWST, informing future extragalactic survey strategies using JWST observations.

JEMS: A deep medium-band imaging survey in the Hubble Ultra-Deep Field with JWST NIRCam & NIRISS

TL;DR

JEMS presents the first public, medium-band JWST imaging survey in the Hubble Ultra Deep Field, enabling high-resolution spectral sampling of distant galaxies. The survey employs five NIRCam medium-band filters F182M, F210M, F430M, F460M, F480M and parallel NIRISS F430M/F480M to densely sample galaxy SEDs from the rest-frame UV to optical, enabling robust emission-line measurements and refined photometric redshifts. A key result is that medium-band colors with a >1 magnitude excess efficiently identify strong line emitters across , notably H+[NII] and [OIII]+H, with Paschen- also accessible. The paper presents the first data release of science-ready mosaics and discusses future data releases, illustrating how JWST medium-band imaging can guide future extragalactic survey strategies.

Abstract

We present JEMS (JWST Extragalactic Medium-band Survey), the first public medium-band imaging survey carried out using JWST/NIRCam and NIRISS. These observations use m and m medium-band filters (NIRCam F182M, F210M, F430M, F460M, F480M; and NIRISS F430M & F480M in parallel) over 15.6 square arcminutes in the Hubble Ultra Deep Field (UDF), thereby building on the deepest multi-wavelength public datasets available anywhere on the sky. We describe our science goals, survey design, NIRCam and NIRISS image reduction methods, and describe our first data release of the science-ready mosaics. Our chosen filters create a JWST imaging survey in the UDF that enables novel analysis of a range of spectral features potentially across the redshift range of , including Paschen-, H+[NII], and [OIII]+H emission at high spatial resolution. We find that our JWST medium-band imaging efficiently identifies strong line emitters (medium-band colors magnitude) across redshifts , most prominently H+[NII] and [OIII]+H. We present our first data release including science-ready mosaics of each medium-band image available to the community, adding to the legacy value of past and future surveys in the UDF. We also describe future data releases. This survey demonstrates the power of medium-band imaging with JWST, informing future extragalactic survey strategies using JWST observations.
Paper Structure (1 section, 3 figures)

This paper contains 1 section, 3 figures.

Table of Contents

  1. Introduction

Figures (3)

  • Figure 1: Key spectral features as a function of redshift in the five medium-band filters (F182M, F210M, F430M, F460M, and F480M). Indicated are the Lyman break and Balmer break as dashed lines, the UV continuum ($1200-2800~\mathrm{\AA}$) as hatched band, and the various emission lines probed by our data.
  • Figure 2: Layout of our NIRCam and NIRISS pointings in the GOODS-S field (HLF WFC3/F160W imaging, inverted grayscale, corrected to the GAIA astrometry). Colored regions indicate the footprint of various legacy data in the HUDF, covered by our NIRCam Module A: HUDF WFC3/IR (orange), and MUSE MXDF (blue). RGB mosaics of our JWST footprints are B:F430M G:F460M R:F480M for NIRCam, and B:F430M, G:F430M+F480M, R:F480M for NIRISS.
  • Figure 3: Left: RGB images for our three JWST pointings (as in Figure \ref{['fig:RGB']}. Right: image cutouts of spectroscopically confirmed galaxies at various redshifts whose colors trace emission line features (in order of increasing redshift). Blue: WFC3/160W; Red:F480M; Green:JWST filter where the corresponding emission line is. For F480M line emitters we use the F460M as green in the RGB.