Hubble Space Telescope and Hyper-Suprime-Cam Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408
Abstract
A dissociative merger is formed by the interplay of ram pressure and gravitational forces, which can lead to a spatial displacement of the dark matter and baryonic components of the recently collided subclusters. CIZA J0107.7+5408 is a nearby (z = 0.105) dissociative merger that hosts two X-ray brightness peaks and a bimodal galaxy distribution. Analyzing MMT/Hectospec observations, we investigate the line-of-sight and spatial distribution of cluster galaxies. Utilizing deep, high-resolution Hubble Space Telescope Advanced Camera for Surveys imaging and large field-of-view Subaru Hyper-Suprime-Cam observations, we perform a weak-lensing analysis of CIZA J0107.7+5408. Our weak-lensing analysis detects a bimodal mass distribution that is spatially consistent with the cluster galaxies but significantly offset from the X-ray brightness peaks. Fitting two Navarro–Frenk–White halos to the lensing signal, we find an equal-mass merger with subcluster masses of M_(200,NE) = 2.8^(1.1)_(-1.1) x 10¹⁴ M_⊙ and M_(200,SW) = 3.1^(1.2)_(-1.2) x 10¹⁴ M_⊙. Moreover, the mass-to-light ratios of the subclusters, (M/L)_(NE) = 571^(+89)_(-91) M_⊙/L_(⊙,B) and (M/L)_(SW) = 564^(+87)_(-89) M_⊙/L_(⊙,B), are found to be consistent with each other and within the range of mass-to-light ratios found for galaxy clusters.
Additional Information
We would like to thank the anonymous referee for comments that helped to improve the manuscript. We thank Tony Mroczkowski for useful discussions. This work is partly funded by NASA/Euclid grant 1484822. Partial support was also provided through an archival research grant from STScI under NASA contract NAS5-26555. Support for S.W.R. was provided by the Chandra X-ray Center through NASA contract NAS8-03060, and the Smithsonian Institution. M.J.J. acknowledges support for the current research from the National Research Foundation of Korea under the program 2022R1A2C1003130. H.C. acknowledges support from the Brain Korea 21 FOUR Program. R.J.v.W. acknowledges support from the ERC Starting Grant ClusterWeb 804208. This work was supported by the K-GMT Science Program (PID: GEMINI-KR-2020B-011) of the Korea Astronomy and Space Science Institute (KASI). This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555. These observations are associated with program 15610. Observations reported here were obtained at the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona. Based [in part] on data collected at the Subaru Telescope, via the time exchange program between Subaru and the international Gemini Observatory, a program of NSFs NOIRLab. The Subaru Telescope is operated by the National Astronomical Observatory of Japan. We are honored and grateful for the opportunity of observing the Universe from Maunakea, which has the cultural, historical, and natural significance in Hawaii. Basic research in radio astronomy at the Naval Research Laboratory is supported by 6.1 base funding.Additional details
- Eprint ID
- 118828
- Resolver ID
- CaltechAUTHORS:20230117-370770100.23
- 1484822
- NASA
- NAS5-26555
- NASA
- NAS8-03060
- NASA
- Smithsonian Institution
- 2022R1A2C1003130
- National Research Foundation of Korea
- Brain Korea 21 FOUR Program
- 804208
- European Research Council (ERC)
- Korea Astronomy and Space Science Institute (KASI)
- 6.1 Base funding
- Naval Research Laboratory
- Created
-
2023-02-10Created from EPrint's datestamp field
- Updated
-
2023-02-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)