RELICS: A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc

Brett Salmon, Dan Coe, Larry Bradley, Marusa Bradač, Victoria Strait, Rachel Paterno-Mahler, Kuang Han Huang, Pascal A. Oesch, Adi Zitrin, Ana Acebron, Nathália Cibirka, Shotaro Kikuchihara, Masamune Oguri, Gabriel B. Brammer, Keren Sharon, Michele Trenti, Roberto J. Avila, Sara Ogaz, Felipe Andrade-Santos, Daniela CarrascoCatherine Cerny, William Dawson, Brenda Louise Frye, Austin Hoag, Christine Jones, Ramesh Mainali, Masami Ouchi, Steven A. Rodney, Daniel P Stark, Keiichi Umetsu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The most distant galaxies known are at z ∼ 10-11, observed 400-500 Myr after the Big Bang. The few z ∼ 10-11 candidates discovered to date have been exceptionally small, barely resolved, if at all, by the Hubble Space Telescope. Here we present the discovery of SPT0615-JD1, a fortuitous z ∼ 10 (z phot = ) galaxy candidate stretched into an arc over ∼2.″5 by the effects of strong gravitational lensing. Discovered in the Reionization Lensing Cluster Survey (RELICS) Hubble Treasury program and companion S-RELICS Spitzer program, this candidate has a lensed H-band magnitude of 24.6 ± 0.1 AB mag. With a magnification of μ ∼ 4-7 estimated from our lens models, the delensed intrinsic magnitude is 26.7 ± 0.1 AB mag, and the half-light radius is r e < 0.8 kpc, both consistent with other z > 9 candidates. The inferred stellar mass () and star formation rate () indicate that this candidate is a typical star-forming galaxy on the z > 6 SFR-M relation. We note that three independent lens models predict two counter images, at least one of which should be of a similar magnitude to the arc, but these counter images are not yet detected. Counter images would not be expected if the arc were at lower redshift. The relatively large physical size could be due to a merger or accretion event, while the unprecedented lensed size of this z ∼ 10 candidate offers the potential for ALMA and the James Webb Space Telescope to study the geometric and kinematic properties of a galaxy observed 500 Myr after the Big Bang.

Original languageEnglish (US)
Article numberL22
JournalAstrophysical Journal Letters
Volume864
Issue number1
DOIs
StatePublished - Sep 1 2018

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arcs
galaxies
counters
lenses
James Webb Space Telescope
merger
star formation rate
kinematics
magnification
stellar mass
accretion
Hubble Space Telescope
stars
radii
programme
rate
effect

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Salmon, B., Coe, D., Bradley, L., Bradač, M., Strait, V., Paterno-Mahler, R., ... Umetsu, K. (2018). RELICS: A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc. Astrophysical Journal Letters, 864(1), [L22]. https://doi.org/10.3847/2041-8213/aadc10

RELICS : A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc. / Salmon, Brett; Coe, Dan; Bradley, Larry; Bradač, Marusa; Strait, Victoria; Paterno-Mahler, Rachel; Huang, Kuang Han; Oesch, Pascal A.; Zitrin, Adi; Acebron, Ana; Cibirka, Nathália; Kikuchihara, Shotaro; Oguri, Masamune; Brammer, Gabriel B.; Sharon, Keren; Trenti, Michele; Avila, Roberto J.; Ogaz, Sara; Andrade-Santos, Felipe; Carrasco, Daniela; Cerny, Catherine; Dawson, William; Frye, Brenda Louise; Hoag, Austin; Jones, Christine; Mainali, Ramesh; Ouchi, Masami; Rodney, Steven A.; Stark, Daniel P; Umetsu, Keiichi.

In: Astrophysical Journal Letters, Vol. 864, No. 1, L22, 01.09.2018.

Research output: Contribution to journalArticle

Salmon, B, Coe, D, Bradley, L, Bradač, M, Strait, V, Paterno-Mahler, R, Huang, KH, Oesch, PA, Zitrin, A, Acebron, A, Cibirka, N, Kikuchihara, S, Oguri, M, Brammer, GB, Sharon, K, Trenti, M, Avila, RJ, Ogaz, S, Andrade-Santos, F, Carrasco, D, Cerny, C, Dawson, W, Frye, BL, Hoag, A, Jones, C, Mainali, R, Ouchi, M, Rodney, SA, Stark, DP & Umetsu, K 2018, 'RELICS: A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc', Astrophysical Journal Letters, vol. 864, no. 1, L22. https://doi.org/10.3847/2041-8213/aadc10
Salmon B, Coe D, Bradley L, Bradač M, Strait V, Paterno-Mahler R et al. RELICS: A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc. Astrophysical Journal Letters. 2018 Sep 1;864(1). L22. https://doi.org/10.3847/2041-8213/aadc10
Salmon, Brett ; Coe, Dan ; Bradley, Larry ; Bradač, Marusa ; Strait, Victoria ; Paterno-Mahler, Rachel ; Huang, Kuang Han ; Oesch, Pascal A. ; Zitrin, Adi ; Acebron, Ana ; Cibirka, Nathália ; Kikuchihara, Shotaro ; Oguri, Masamune ; Brammer, Gabriel B. ; Sharon, Keren ; Trenti, Michele ; Avila, Roberto J. ; Ogaz, Sara ; Andrade-Santos, Felipe ; Carrasco, Daniela ; Cerny, Catherine ; Dawson, William ; Frye, Brenda Louise ; Hoag, Austin ; Jones, Christine ; Mainali, Ramesh ; Ouchi, Masami ; Rodney, Steven A. ; Stark, Daniel P ; Umetsu, Keiichi. / RELICS : A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc. In: Astrophysical Journal Letters. 2018 ; Vol. 864, No. 1.
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abstract = "The most distant galaxies known are at z ∼ 10-11, observed 400-500 Myr after the Big Bang. The few z ∼ 10-11 candidates discovered to date have been exceptionally small, barely resolved, if at all, by the Hubble Space Telescope. Here we present the discovery of SPT0615-JD1, a fortuitous z ∼ 10 (z phot = ) galaxy candidate stretched into an arc over ∼2.″5 by the effects of strong gravitational lensing. Discovered in the Reionization Lensing Cluster Survey (RELICS) Hubble Treasury program and companion S-RELICS Spitzer program, this candidate has a lensed H-band magnitude of 24.6 ± 0.1 AB mag. With a magnification of μ ∼ 4-7 estimated from our lens models, the delensed intrinsic magnitude is 26.7 ± 0.1 AB mag, and the half-light radius is r e < 0.8 kpc, both consistent with other z > 9 candidates. The inferred stellar mass () and star formation rate () indicate that this candidate is a typical star-forming galaxy on the z > 6 SFR-M ∗ relation. We note that three independent lens models predict two counter images, at least one of which should be of a similar magnitude to the arc, but these counter images are not yet detected. Counter images would not be expected if the arc were at lower redshift. The relatively large physical size could be due to a merger or accretion event, while the unprecedented lensed size of this z ∼ 10 candidate offers the potential for ALMA and the James Webb Space Telescope to study the geometric and kinematic properties of a galaxy observed 500 Myr after the Big Bang.",
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AU - Oesch, Pascal A.

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