2022ApJ...940L...1W

Query : 2022ApJ...940L...1W

2022ApJ...940L...1W - Astrophys. J., 940, L1-L12 (2022/November-3)

JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z = 6.2.

WELCH B., COE D., ZACKRISSON E., DE MINK S.E., RAVINDRANATH S., ANDERSON J., BRAMMER G., BRADLEY L., YOON J., KELLY P., DIEGO J.M., WINDHORST R., ZITRIN A., DIMAURO P., JIMENEZ-TEJA Y., ABDURRO'UF, NONINO M., ACEBRON A., ANDRADE-SANTOS F., AVILA R.J., BAYLISS M.B., BENITEZ A., BROADHURST T., BHATAWDEKAR R., BRADAC M., CAMINHA G.B., CHEN W., ELDRIDGE J., FARAG E., FLORIAN M., FRYE B., FUJIMOTO S., GOMEZ S., HENRY A., HSIAO T.Y.-Y., HUTCHISON T.A., JAMES B.L., JOYCE M., JUNG I., KHULLAR G., LARSON R.L., MAHLER G., MANDELKER N., McCANDLISS S., MORISHITA T., NEWSHORE R., NORMAN C., O'CONNOR K., OESCH P.A., OGURI M., OUCHI M., POSTMAN M., RIGBY J.R., RYAN R.E.Jr, SHARMA S., SHARON K., STRAIT V., STROLGER L.-G., TIMMES F.X., TOFT S., TRENTI M., VANZELLA E. and VIKAEUS A.

Abstract (from CDS):

The gravitationally lensed star WHL 0137-LS, nicknamed Earendel, was identified with a photometric redshift zphot = 6.2 ± 0.1 based on images taken with the Hubble Space Telescope. Here we present James Webb Space Telescope (JWST) Near Infrared Camera images of Earendel in eight filters spanning 0.8-5.0 μm. In these higher-resolution images, Earendel remains a single unresolved point source on the lensing critical curve, increasing the lower limit on the lensing magnification to μ > 4000 and restricting the source plane radius further to r < 0.02 pc, or ∼4000 au. These new observations strengthen the conclusion that Earendel is best explained by an individual star or multiple star system and support the previous photometric redshift estimate. Fitting grids of stellar spectra to our photometry yields a stellar temperature of Teff ≃ 13,000-16,000 K, assuming the light is dominated by a single star. The delensed bolometric luminosity in this case ranges from $\mathrm{log}(L)=5.8$ to 6.6 L⊙, which is in the range where one expects luminous blue variable stars. Follow-up observations, including JWST NIRSpec scheduled for late 2022, are needed to further unravel the nature of this object, which presents a unique opportunity to study massive stars in the first billion years of the universe.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational lensing - Strong gravitational lensing - Massive stars

Simbad objects: 4

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Number of rows : 4
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 [WCD2022] WHL0137-LS LeI 01 37 00 +23 13.9           ~ 13 0
2 ACT-CL J0137.4-0827 ClG 01 37 24.9 -08 27 22           ~ 50 0
3 NAME Sunrise Arc G 01 37 25.1882 -08 28 14.437         28.4977 ~ 25 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0

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