Other red dots: A possible GLIMPSE of normal AGB stars at Cosmic Noon through extreme lensing

TL;DR

This paper reports the discovery of extremely faint, highly magnified red stars near critical curves in JWST images of a galaxy cluster, revealing low-mass stellar populations at high redshift.

Contribution

First detection of low-mass, highly magnified AGB and supergiant stars at cosmological distances using extreme lensing and deep JWST imaging.

Findings

Detected three likely AGB stars with temperatures 3200-3750 K.

Identified one yellow super-giant star around 6750 K.

Demonstrated potential to use lensed stars as standard candles at high redshift.

Abstract

We report the discovery of four extremely faint ($m_{\mathrm{F444W}}\gtrsim29$) red point sources in recent ultra-deep JWST/NIRCam images of the strong lensing galaxy cluster Abell S1063. All four sources sit in lensed arcs, on the symmetry points very close to the critical curves for their host-galaxies' redshifts ($z\sim1-4$). Remarkably, these point sources appear in most arcs that are sufficiently faint close to the critical curve's position ($<21\,\mathrm{nJy}\,\mathrm{arcsec}^{-2}$ in F115W). This suggests that -- unlike previous caustic-crossing events or lensed stars -- thanks to the unprecedented depth of the GLIMPSE observations paired with the extreme lensing magnification (up to $\mu\sim10^4$) we might be resolving the lower-mass ($M\sim1-11\,\mathrm{M}_{\odot}$) red stellar population. Concretely, we detect three likely extremely magnified asymptotic giant branch (AGB) stars ($T_{\mathrm{eff}}\sim3200-3750$ K), and one yellow super-giant star ($T_{\mathrm{eff}}\sim6750$ K) -- possibly a yellow hyper-giant or a Cepheid. In addition to offering the first glimpse at low-mass extremely magnified stars, these detections open a possible window into stellar populations, evolution, and chemical enrichment at high redshifts, and could pave the way for using lensed stars such as these as standard candles to populate the distance ladder at cosmological redshifts.