Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/28442
Titolo: | MACS J0416.1-2403: Impact of line-of-sight structures on strong gravitational lensing modelling of galaxy clusters | Autori: | Chirivì, G. Suyu, S. H. Grillo, C. Halkola, A. Balestra, I. Caminha, G. B. MERCURIO, AMATA Rosati, P. |
Data pubblicazione: | 2018 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 614 | Da pagina:: | A8 | Abstract: | Exploiting the powerful tool of strong gravitational lensing by galaxy clusters to study the highest-redshift Universe and cluster mass distributions relies on precise lens mass modelling. In this work, we aim to present the first attempt at modelling line-of-sight (LOS) mass distribution in addition to that of the cluster, extending previous modelling techniques that assume mass distributions to be on a single lens plane. We have focussed on the Hubble Frontier Field cluster MACS J0416.1-2403, and our multi-plane model reproduces the observed image positions with a rms offset of 0.''53. Starting from this best-fitting model, we simulated a mock cluster that resembles MACS J0416.1-2403 in order to explore the effects of LOS structures on cluster mass modelling. By systematically analysing the mock cluster under different model assumptions, we find that neglecting the lensing environment has a significant impact on the reconstruction of image positions (rms 0.''3); accounting for LOS galaxies as if they were at the cluster redshift can partially reduce this offset. Moreover, foreground galaxies are more important to include into the model than the background ones. While the magnification factor of the lensed multiple images are recovered within 10% for 95% of them, those 5% that lie near critical curves can be significantly affected by the exclusion of the lensing environment in the models. In addition, LOS galaxies cannot explain the apparent discrepancy in the properties of massive sub-halos between MACS J0416.1-2403 and N-body simulated clusters. Since our model of MACS J0416.1-2403 with LOS galaxies only reduced modestly the rms offset in the image positions, we conclude that additional complexities would be needed in future models of MACS J0416.1-2403. | URI: | http://hdl.handle.net/20.500.12386/28442 | URL: | https://www.aanda.org/articles/aa/abs/2018/06/aa31433-17/aa31433-17.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201731433 | Bibcode ADS: | 2018A&A...614A...8C | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
1706.07815.pdf | 759.25 kB | Adobe PDF | Visualizza/apri | |
aa31433-17.pdf | Pdf editoriale | 3.19 MB | Adobe PDF | Visualizza/apri |
Page view(s)
39
controllato il 24-apr-2024
Download(s)
17
controllato il 24-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.