9 papers
On what scales does strong lensing robustly constrain the mass profile of low-mass perturbers?
Maryam Tajalli, Simona Vegetti
Galaxy-galaxy strong gravitational lensing is an established method to detect and characterise low-mass haloes, which are otherwise too faint to be directly observed. Recent analys…
A possible challenge for Cold and Warm Dark Matter
S. Vegetti, S. D. M. White, J. P. McKean +5
Measuring the density profile and mass concentration of dark-matter haloes is a key test of the standard cold dark matter paradigm. Such objects are dark and thus challenging to ch…
An extended and extremely thin gravitational arc from a lensed compact symmetric object at redshift 2.059
J. P. McKean, C. Spingola, D. M. Powell +1
Compact symmetric objects (CSOs) are thought to be short-lived radio sources with two lobes of emission that are separated by less than a kpc in projection. However, studies of suc…
A million-solar-mass object detected at cosmological distance using gravitational imaging
D. M. Powell, J. P. McKean, S. Vegetti +3
Structure on sub-galactic scales provides important tests of galaxy formation models and the nature of dark matter. However, such objects are typically too faint to provide robust…
Investigation of mass substructure in gravitational lens system SDP.81 with ALMA long-baseline observations
H. R. Stacey, D. M. Powell, S. Vegetti +2
The prevalence and properties of low-mass dark matter haloes serve as a crucial test for understanding the nature of dark matter, and may be constrained through the gravitational d…
SHARP -- IX. The dense, low-mass perturbers in B1938+666 and J0946+1006: implications for cold and self-interacting dark matter
Maryam Tajalli, Simona Vegetti, Conor M. O'Riordan +5
We present an extended analysis of the gravitational lens systems SDSS J0946+1006 and JVAS B1938+666. We focus on the properties of two low-mass dark matter haloes previously detec…