TY - JOUR
T1 - A Strong-lensing Model for the WMDF JWST/GTO Very Rich Cluster A1489
AU - Zitrin, Adi
AU - Acebron, Ana
AU - Coe, Dan
AU - Kelly, Patrick L.
AU - Koekemoer, Anton M.
AU - Nonino, Mario
AU - Windhorst, Rogier A.
AU - Frye, Brenda
AU - Pascale, Massimo
AU - Broadhurst, Tom
AU - Cohen, Seth H.
AU - Diego, Jose M.
AU - Finkelstein, Steven L.
AU - Jansen, Rolf A.
AU - Larson, Rebecca L.
AU - Yan, Haojing
AU - Alpaslan, Mehmet
AU - Bhatawdekar, Rachana
AU - Conselice, Christopher J.
AU - Griffiths, Alex
AU - Strolger, Louis Gregory
AU - B. Wyithe, J. Stuart
N1 - Publisher Copyright:
© 2020. The American Astronomical Society. All rights reserved.
PY - 2020/11/10
Y1 - 2020/11/10
N2 - We present a first strong-lensing model for the galaxy cluster RM J121218.5+273255.1 (z = 0.35; hereafter RMJ1212; also known as A1489). This cluster is among the top 0.1% richest clusters in the redMaPPer catalog; it is significantly detected in X-ray and through the Sunyaev-Zel'dovich effect in ROSAT and Planck data, respectively, and its optical luminosity distribution implies a very large lens, following mass-to-light scaling relations. Based on these properties it was chosen for the Webb Medium Deep Fields (WMDF) James Webb Space Telescope/Guaranteed Time Observations program. In preparation for this program, RMJ1212 was recently imaged with Gemini Multi-Object Spectrograph (GMOS) on Gemini North and in seven optical and near-infrared bands with the Hubble Space Telescope (HST). We use these data to map the inner mass distribution of the cluster, uncovering various sets of multiple images. We also search for high-redshift candidates in the data, as well as for transient sources. We find over a dozen high-redshift (z ⪆ 6) candidates based on both photometric redshift and the dropout technique. No prominent (⪆5σ) transients were found in the data between the two HST visits. Our lensing analysis reveals a relatively large lens with an effective Einstein radius of θ E ≃ 32 3″ (z s = 2), in broad agreement with the scaling-relation expectations. RMJ1212 demonstrates that powerful lensing clusters can be selected in a robust and automated way following the light-traces-mass assumption.
AB - We present a first strong-lensing model for the galaxy cluster RM J121218.5+273255.1 (z = 0.35; hereafter RMJ1212; also known as A1489). This cluster is among the top 0.1% richest clusters in the redMaPPer catalog; it is significantly detected in X-ray and through the Sunyaev-Zel'dovich effect in ROSAT and Planck data, respectively, and its optical luminosity distribution implies a very large lens, following mass-to-light scaling relations. Based on these properties it was chosen for the Webb Medium Deep Fields (WMDF) James Webb Space Telescope/Guaranteed Time Observations program. In preparation for this program, RMJ1212 was recently imaged with Gemini Multi-Object Spectrograph (GMOS) on Gemini North and in seven optical and near-infrared bands with the Hubble Space Telescope (HST). We use these data to map the inner mass distribution of the cluster, uncovering various sets of multiple images. We also search for high-redshift candidates in the data, as well as for transient sources. We find over a dozen high-redshift (z ⪆ 6) candidates based on both photometric redshift and the dropout technique. No prominent (⪆5σ) transients were found in the data between the two HST visits. Our lensing analysis reveals a relatively large lens with an effective Einstein radius of θ E ≃ 32 3″ (z s = 2), in broad agreement with the scaling-relation expectations. RMJ1212 demonstrates that powerful lensing clusters can be selected in a robust and automated way following the light-traces-mass assumption.
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U2 - 10.3847/1538-4357/abb8dd
DO - 10.3847/1538-4357/abb8dd
M3 - Article
AN - SCOPUS:85096520998
SN - 0004-637X
VL - 903
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 137
ER -