A Likely Supermassive Black Hole Revealed by Its Einstein Radius in Hubble Frontier Fields Images

DOI: 
10.3847/1538-4357/aad17b
Publication date: 
04/09/2018
Main author: 
Chen M.C.
IAA authors: 
Benitez, N.
Authors: 
Chen M.C., Broadhurst T., Lim J., Diego J.M., Ohyama Y., Ford H., Benitez N.
Journal: 
Astrophysical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
863
Pages: 
135
Number: 
135
Abstract: 
At cosmological distances, gravitational lensing can in principle provide direct mass measurements of supermassive black holes (SMBHs). Here, we directly estimate the mass of a SMBH in the brightest cluster galaxy (BCG) of MACS J1149.5+2223 at z = 0.54 using one of the multiply lensed images of a background spiral galaxy at z = 1.49 projected close to the BCG. A lensed arc is curved toward the BCG center, corresponding to an intrinsically compact region in one of the spiral arms. This arc has a radius of curvature of only ∼0.″6, betraying the presence of a local compact deflector. Its curvature is most simply reproduced by a point-like object with a mass of , similar to SMBH masses in local elliptical galaxies having comparable luminosities. The SMBH is noticeably offset by 4.4 ± 0.3 kpc from the BCG light center, which is plausibly the result of a kick imparted ∼2.0 ×107 years ago during the merger of two SMBHs, placing it just beyond the stellar core. A similar curvature can be produced by replacing the offset SMBH with a compact galaxy having a mass of ∼2 ×1010 M o within a cutoff radius of <4 kpc, and an unusually large to make it undetectable in the deep Hubble Frontiers Fields image, at or close to the cluster redshift. However, such a lensing galaxy perturbs the adjacent lensed images in an undesirable way. © 2018. The American Astronomical Society. All rights reserved..
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2018ApJ...863..135C/abstract
ADS Bibcode: 
2018ApJ...863..135C
Keywords: 
galaxies: clusters: individual (MACS J1149.5+2223); galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: nuclei; gravitational lensing: strong