@article{10902/31551,
year = {2023},
url = {https://hdl.handle.net/10902/31551},
abstract = {We identify 71 distant stars in James Webb Space Telescope/NIRCam early release observations (ERO) images of the field of galaxy cluster SMACS J0723.3-7327 (SMACS 0723). Given the relatively small (∼10°) angular separation between SMACS 0723 and the Large Magellanic Cloud (LMC), it is likely that these stars are associated with the LMC outskirts or the Leading Arm. This is further bolstered by a spectral energy distribution (SED) analysis, which suggests an excess of stars at a physical distance of 40–100 kpc, consistent with being associated with or located behind the Magellanic system. In particular, we find that the overall surface density of stars brighter than 27.0 mag in the field of SMACS 0723 is ∼2.3 times that of stars in a blank field with similar Galactic latitude (the North Ecliptic Pole Time Domain Field), and that the density of stars in the SMACS 0723 field with SED-derived distances consistent with the Magellanic system is ∼6.1 times larger than that of the blank field. The candidate stars at these distances are consistent with a stellar population at the same distance modulus with [Fe/H] = −1.0 and an age of ∼5.0 Gyr. On the assumption that all of the 71 stars are associated with the LMC, then the stellar density of the LMC at the location of the SMACS 0723 field is ∼740 stars kpc−3 , which helps trace the density of stars in the LMC outskirts.},
organization = {We thank Ian Smail for helpful suggestions regarding the source-detection methods. We also thank Steven Willner and the referee for helpful suggestions that improved the submitted manuscript. J.S. acknowledges support from an undergraduate Arizona NASA Space Grant, Cooperative Agreement 80NSSC20M0041. R.A.W., S.H.C., and R.A.J. acknowledge support from NASA JWST Interdisciplinary Scientist grants NAG5-12460, NNX14AN10G and 80NSSC18K0200 from GSFC. C.J.C. and N.J.A. acknowledge support from the European Research Council (ERC) Advanced Investigator Grant EPOCHS (788113). M.A.M. acknowledges the support of a National Research Council of Canada Plaskett Fellowship, and the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE17010001. C.N.A.W. acknowledges fund ing from the JWST/NIRCam contract NASS-0215 to the University of Arizona. We also acknowledge the indigenous peoples of Arizona, including the Akimel O’odham (Pima) and Pee Posh (Maricopa) Indian Communities, whose care and keeping of the land has enabled us to be at ASU’s Tempe campus in the Salt River Valley, where much of our work was conducted. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with JWST programs 1176, 2736, and 2738. All of the JWST data used in this paper can be found on doi:10.17909/b7hf-he53. This work is based on observations taken by the RELICS Treasury Program (Coe 2016, GO 14096) with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), pro cessed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. We also acknowledge the JWST ERO team responsible for providing these products.18},
publisher = {Institute of Physics Publishing},
publisher = {Astrophysical Journal, 2023, 958(108)},
title = {Magellanic system stars Identified in SMACS J0723.3-7327 James webb space telescope early release observations images},
author = {Summers, Jake and Windhorst, Rogier A. and Cohen, Seth H. and Jansen, Rolf A. and Carleton, Timothy and Kamieneski, Patrick S. and Holwerda, Benne W. and Conselice, Christopher J. and Adams, Nathan J. and Frye, Brenda L. and Diego Rodríguez, José María and Willmer, Christopher N. A. and Ortiz, Rafael and Cheng, Cheng and Pigarelli, Alex and Robotham, Aaron and D'Silva, Jordan C. J. and Tompkins, Scott and Driver, Simon P. and Yan, Haojing},
}