NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Infrared observations of the dark matter lens candidate Q2345+007Deep K-band observations are presented of the double image quasar Q2345+007. This has the largest separation (7.1 sec) of any quasar image pair considered as gravitationally lensed, so the required lens is massive (10(exp 13) solar masses). No lens has been detected in previous deep images at visible wavelengths, and we find no lens to limiting K magnitude 20.0 in the infrared image. This constrains any lens to being much less luminous than brightest cluster galaxies, while the lens must be much more massive than such galaxies to produce the observed separation. Because spectral data indicate exceptional intrinsic similarity in the quasar image components, this pair remains as the most intriguing example of an observed configuration requiring the presence of massive, concentrated dark matter acting as a gravitational lens.
Document ID
19950040852
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mcleod, Brian (University of Arizona, Tucson, AZ United States)
Rieke, Marcia (University of Arizona, Tucson, AZ United States)
Weedman, Daniel (Pennsylvania State University State College, PA, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 433
Issue: 2
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-3136
Distribution Limits
Public
Copyright
Other