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  A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48

Pignataro, G. V., Bergamini, P., Meneghetti, M., Vanzella, E., Calura, F., Grillo, C., et al. (2021). A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48. Astronomy and Astrophysics, 655: A81. doi:10.1051/0004-6361/202141586.

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Pignataro, G. V., Autor
Bergamini, P., Autor
Meneghetti, M., Autor
Vanzella, E., Autor
Calura, F., Autor
Grillo, C., Autor
Rosati, P., Autor
Angora, G., Autor
Brammer, G., Autor
Caminha, G. B.1, Autor           
Mercurio, A., Autor
Nonino, M., Autor
Tozzi, P., Autor
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Zusammenfassung: We present a strong lensing analysis of the galaxy cluster PSZ1 G311.65-18.48 (z = 0.443) using multi-band observations with Hubble Space Telescope complemented with VLT/MUSE spectroscopic data. The MUSE observations provide redshift estimates for the lensed sources and help to reduce misidentification of the multiple images. Spectroscopic data are also used to measure the inner velocity dispersions of 15 cluster galaxies and calibrate the scaling relations to model the subhalo cluster component. The model is based on 62 multiple images grouped in 17 families belonging to four different sources. The majority of them are multiple images of compact stellar knots belonging to a single star-forming galaxy at z = 2.3702. This source is strongly lensed by the cluster to form the Sunburst Arc system. To accurately reproduce all the multiple images, we built a parametric mass model, which includes both cluster-scale and galaxy-scale components. The resulting model has a rms separation between the model-predicted and the observed positions of the multiple images of only 0.14″. We conclude that PSZ1 G311.65-18.48 has a relatively round projected shape and a large Einstein radius (29″ for zs = 2.3702), which could indicate that the cluster is elongated along the line of sight. The Sunburst Arc source is located at the intersection of a complex network of caustics, which explains why parts of the arc are imaged with unprecedented multiplicity (up to 12 times).

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Sprache(n): eng - English
 Datum: 2021-06-18
 Publikationsstatus: Online veröffentlicht
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 Identifikatoren: DOI: 10.1051/0004-6361/202141586
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Titel: Astronomy and Astrophysics
  Andere : Astron. Astrophys.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: France : EDP Sciences S A
Seiten: - Band / Heft: 655 Artikelnummer: A81 Start- / Endseite: - Identifikator: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1