Open AccessScalar field haloes as gravitational lenses
Author(s) -
Schunck Franz E.,
Fuchs Burkhard,
Mielke Eckehard W.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10330.x
Subject(s) - physics , gravitational lens , flattening , astrophysics , dark matter , scalar field , scalar (mathematics) , strong gravitational lensing , gravitation , gravitational field , classical mechanics , astronomy , galaxy , redshift , geometry , mathematics
A non‐topological soliton model with a repulsive scalar self‐interaction of the Emden type provides a constant‐density core, similarly as the empirical Burkert profile of dark matter (DM) haloes. As a further test, we derive the gravitational lens properties of our model, in particular, the demarcation curves between ‘weak’ and ‘strong’ lensing. Accordingly, strong lensing with typically three images is almost three times more probable for our solitonic model than for the Burkert fit. Moreover, some prospective consequences of a possible flattening of DM haloes are indicated.