期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 762, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/762/2/L30
关键词
dark matter; galaxies: clusters: general; galaxies: clusters: individual (MACS J0416.1-2403); galaxies: high-redshift; gravitational lensing: strong
资金
- Baden Wurttemberg Stiftung [II/2-6]
- DFG cluster of excellence Origin and Structure of the Universe
- National Science Council of Taiwan [NSC100-2112-M-001-008-MY3]
- Academia Sinica Career Development Award
- NASA [NAS 5-32865, NAS 5-26555]
We perform a strong lensing analysis of the merging galaxy cluster MACS J0416.1-2403 (M0416; z = 0.42) in recent CLASH/HST observations. We identify 70 new multiple images and candidates of 23 background sources in the range 0.7 less than or similar to z(phot) less than or similar to 6.14 including two probable high-redshift dropouts, revealing a highly elongated lens with axis ratio similar or equal to 5:1, and a major axis of similar to 100 '' (z(s) similar to 2). Compared to other well-studied clusters, M0416 shows an enhanced lensing efficiency. Although the critical area is not particularly large (similar or equal to 0.6 square'; z(s) similar to 2), the number of multiple images, per critical area, is anomalously high. We calculate that the observed elongation boosts the number of multiple images, per critical area, by a factor of similar to 2.5x, due to the increased ratio of the caustic area relative to the critical area. Additionally, we find that the observed separation between the two main mass components enlarges the critical area by a factor of similar to 2. These geometrical effects can account for the high number (density) of multiple images observed. We find in numerical simulations that only similar to 4% of the clusters (with M-vir >= 6 x 10(14) h(-1) M-circle dot) exhibit critical curves as elongated as in M0416.
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