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Sökning: WFRF:(Teja D) > (2020-2023) > Two Lensed Star Can...

Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015

Meena, Ashish Kumar (författare)
Ben Gurion Univ Negev, Phys Dept, POB 653, IL-84105 Beer Sheva, Israel.
Zitrin, Adi (författare)
Ben Gurion Univ Negev, Phys Dept, POB 653, IL-84105 Beer Sheva, Israel.
Jimenez-Teja, Yolanda (författare)
Inst Astrofis Andalucia, Glorieta Astron S N, E-18008 Granada, Spain.;Observ Nacl MCTI ON, Rua Gal Jose Cristino 77, BR-20921400 Sao Cristovao, RJ, Brazil.
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Zackrisson, Erik (författare)
Uppsala universitet,Observationell astrofysik
Wenlei, Chen (författare)
Coe, Dan (författare)
Space Telescope Sci Inst STScI, 3700 San Martin Dr, Baltimore, MD 21218 USA.;ESA, STScI, AURA, Baltimore, MD USA.;Johns Hopkins Univ, Ctr Astrophys Sci, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA.
Diego, Jose M. (författare)
Inst Fis Cantabria CSIC UC, Ave Castros S-N, E-39005 Santander, Spain.
Dimauro, Paola (författare)
INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy.
Furtak, Lukas J. (författare)
Ben Gurion Univ Negev, Phys Dept, POB 653, IL-84105 Beer Sheva, Israel.
Kelly, Patrick L. (författare)
Univ Minnesota, Sch Phys & Astron, 116 Church St SE, Minneapolis, MN 55455 USA.
Oguri, Masamune (författare)
Chiba Univ, Ctr Frontier Sci, 1-33 Yayoi Cho,Inage Ku, Chiba 2638522, Japan.;Chiba Univ, Grad Sch Sci, Dept Phys, 1-33 Yayoi Cho,Inage Ku, Chiba 2638522, Japan.
Welch, Brian (författare)
Univ Maryland, Dept Astron, College Pk, MD 20742 USA.;NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 USA.;NASA, Ctr Res & Explorat Space Sci & Technol, GSFC, Greenbelt, MD 20771 USA.
Abdurro'uf, Abdurro'uf (författare)
Space Telescope Sci Inst STScI, 3700 San Martin Dr, Baltimore, MD 21218 USA.;Johns Hopkins Univ, Ctr Astrophys Sci, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA.
Andrade-Santos, Felipe (författare)
Berklee Coll Mus, Dept Liberal Arts & Sci, 7 Haviland St, Boston, MA 02215 USA.;Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA.
Adamo, Angela (författare)
Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
Bhatawdekar, Rachana (författare)
ESA, ESTEC, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
Bradac, Marusa (författare)
Univ Ljubljana, Dept Math & Phys, Jadranska Ulica 19, SI-1000 Ljubljana, Slovenia.;Univ Calif Davis, Dept Phys & Astron, 1 Shields Ave, Davis, CA 95616 USA.
Bradley, Larry D. (författare)
Space Telescope Sci Inst STScI, 3700 San Martin Dr, Baltimore, MD 21218 USA.
Broadhurst, Tom (författare)
Univ Basque Country UPV EHU, Dept Theoret Phys, Bilbao, Spain.;DIPC, E-20018 Donostia San Sebastian, Spain.;Ikerbasque, Basque Fdn Sci, Bilbao, Spain.
Conselice, Christopher J. (författare)
Univ Manchester, Jodrell Bank Ctr Astrophys, Oxford Rd, Manchester, Lancs, England.
Dayal, Pratika (författare)
Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands.
Donahue, Megan (författare)
Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
Frye, Brenda L. (författare)
Univ Arizona, Dept Astron, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA.
Fujimoto, Seiji (författare)
Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA.
Hsiao, Tiger Yu-Yang (författare)
Johns Hopkins Univ, Ctr Astrophys Sci, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA.
Kokorev, Vasily (författare)
Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands.
Mahler, Guillaume (författare)
Univ Durham, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England.;Univ Durham, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England.
Vanzella, Eros (författare)
INAF OAS, Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.
Windhorst, Rogier A. (författare)
Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA.
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Ben Gurion Univ Negev, Phys Dept, POB 653, IL-84105 Beer Sheva, Israel Inst Astrofis Andalucia, Glorieta Astron S N, E-18008 Granada, Spain.;Observ Nacl MCTI ON, Rua Gal Jose Cristino 77, BR-20921400 Sao Cristovao, RJ, Brazil. (creator_code:org_t)
2023-02-09
2023
Engelska.
Ingår i: Astrophysical Journal Letters. - : Institute of Physics (IOP). - 2041-8205 .- 2041-8213. ; 944:1
Relaterad länk:
https://doi.org/10.3...
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https://uu.diva-port... (primary) (Raw object)
https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • We report the discovery of two extremely magnified lensed star candidates behind the galaxy cluster MACS J0647.7+015 using recent multiband James Webb Space Telescope (JWST) NIRCam observations. The star candidates are seen in a previously known, z (phot) similar or equal to 4.8 dropout giant arc that straddles the critical curve. The candidates lie near the expected critical curve position, but lack clear counter-images on the other side of it, suggesting these are possibly stars undergoing caustic crossings. We present revised lensing models for the cluster, including multiply imaged galaxies newly identified in the JWST data, and use them to estimate background macro-magnifications of at least greater than or similar to 90 and greater than or similar to 50 at the positions of the two candidates, respectively. With these values, we expect effective, caustic-crossing magnifications of similar to[10(3)-10(5)] for the two star candidates. The spectral energy distributions of the two candidates match well the spectra of B-type stars with best-fit surface temperatures of similar to 10,000 K, and similar to 12,000 K, respectively, and we show that such stars with masses greater than or similar to 20 M (circle dot) and greater than or similar to 50 M (circle dot), respectively, can become sufficiently magnified to be observable. We briefly discuss other alternative explanations and conclude that these objects are likely lensed stars, but also acknowledge that the less-magnified candidate may alternatively reside in a star cluster. These star candidates constitute the second highest-redshift examples to date after Earendel at z (phot) similar or equal to 6.2, establishing further the potential of studying extremely magnified stars at high redshifts with JWST. Planned future observations, including with NIRSpec, will enable a more detailed view of these candidates in the near future.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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