LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method | Zendy

Sylvanie Wallington | Zendy; C. S. Kochanek | Zendy; Ramesh Narayan | Zendy

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LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method

Author(s) -

Sylvanie Wallington,

C. S. Kochanek,

Ramesh Narayan

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/177401

Subject(s) - gravitational lens , dimensionless quantity , physics , lens (geology) , gravitation , principle of maximum entropy , algorithm , computer science , astrophysics , optics , classical mechanics , artificial intelligence , mechanics , redshift , galaxy

We present a new algorithm for inverting poorly resolved gravitational lenssystems using the maximum entropy method (MEM). We test the method withsimulations and then apply it to an 8 GHz VLA map of the radio ring lensMG1654+134. We model the lens as a singular isothermal sphere embedded in anexternal shear field and find the critical radius of the lens is$b=0\parcs9820$, the dimensionless shear is $\gamma=0.0771$, and the positionangle of the shear is $\theta=100\pdeg8$. These results are consistent with theresults obtained by Kochanek (1995) using a complementary inversion algorithmbased on Clean.Comment: 27 pages, uuencoded, gzip compressed postscrip

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