On the density profile of dark matter substructure in gravitational lens galaxies
We consider three extensions of the Navarro, Frenk and White (NFW) profile and investigate the intrinsic degeneracies among the density profile parameters on the gravitational lensing effect of satellite galaxies on highly magnified Einstein rings. In particular, we find that the gravitational imagi...
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| Format: | Article |
| Language: | en_US |
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Oxford University Press
2015
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| Online Access: | http://hdl.handle.net/1721.1/98447 https://orcid.org/0000-0001-8593-7692 |
| _version_ | 1811080853528248320 |
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| author | Vegetti, Simona Vogelsberger, Mark |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Vegetti, Simona Vogelsberger, Mark |
| author_sort | Vegetti, Simona |
| collection | MIT |
| description | We consider three extensions of the Navarro, Frenk and White (NFW) profile and investigate the intrinsic degeneracies among the density profile parameters on the gravitational lensing effect of satellite galaxies on highly magnified Einstein rings. In particular, we find that the gravitational imaging technique can be used to exclude specific regions of the considered parameter space, and therefore, models that predict a large number of satellites in those regions. By comparing the lensing degeneracy with the intrinsic density profile degeneracies, we show that theoretical predictions based on fits that are dominated by the density profile at larger radii may significantly over- or under-estimate the number of satellites that are detectable with gravitational lensing. Finally, using the previously reported detection of a satellite in the gravitational lens system JVAS B1938+666 as an example, we derive for this detected satellite values of r[subscript max] and v[subscript max] that are, for each considered profile, consistent within 1σ with the parameters found for the luminous dwarf satellites of the Milky Way and with a mass density slope γ < 1.6. We also find that the mass of the satellite within the Einstein radius as measured using gravitational lensing is stable against assumptions on the substructure profile. In the future thanks to the increased angular resolution of very long baseline interferometry at radio wavelengths and of the E-ELT in the optical we will be able to set tighter constraints on the number of allowed substructure profiles. |
| first_indexed | 2024-09-23T11:37:57Z |
| format | Article |
| id | mit-1721.1/98447 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:37:57Z |
| publishDate | 2015 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | mit-1721.1/984472022-09-27T20:50:29Z On the density profile of dark matter substructure in gravitational lens galaxies Vegetti, Simona Vogelsberger, Mark Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Vegetti, Simona Vogelsberger, Mark We consider three extensions of the Navarro, Frenk and White (NFW) profile and investigate the intrinsic degeneracies among the density profile parameters on the gravitational lensing effect of satellite galaxies on highly magnified Einstein rings. In particular, we find that the gravitational imaging technique can be used to exclude specific regions of the considered parameter space, and therefore, models that predict a large number of satellites in those regions. By comparing the lensing degeneracy with the intrinsic density profile degeneracies, we show that theoretical predictions based on fits that are dominated by the density profile at larger radii may significantly over- or under-estimate the number of satellites that are detectable with gravitational lensing. Finally, using the previously reported detection of a satellite in the gravitational lens system JVAS B1938+666 as an example, we derive for this detected satellite values of r[subscript max] and v[subscript max] that are, for each considered profile, consistent within 1σ with the parameters found for the luminous dwarf satellites of the Milky Way and with a mass density slope γ < 1.6. We also find that the mass of the satellite within the Einstein radius as measured using gravitational lensing is stable against assumptions on the substructure profile. In the future thanks to the increased angular resolution of very long baseline interferometry at radio wavelengths and of the E-ELT in the optical we will be able to set tighter constraints on the number of allowed substructure profiles. 2015-09-10T17:08:50Z 2015-09-10T17:08:50Z 2014-07 2014-06 Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 http://hdl.handle.net/1721.1/98447 Vegetti, S., and M. Vogelsberger. “On the Density Profile of Dark Matter Substructure in Gravitational Lens Galaxies.” Monthly Notices of the Royal Astronomical Society 442, no. 4 (July 3, 2014): 3598–3603. https://orcid.org/0000-0001-8593-7692 en_US http://dx.doi.org/10.1093/mnras/stu1284 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press arXiv |
| spellingShingle | Vegetti, Simona Vogelsberger, Mark On the density profile of dark matter substructure in gravitational lens galaxies |
| title | On the density profile of dark matter substructure in gravitational lens galaxies |
| title_full | On the density profile of dark matter substructure in gravitational lens galaxies |
| title_fullStr | On the density profile of dark matter substructure in gravitational lens galaxies |
| title_full_unstemmed | On the density profile of dark matter substructure in gravitational lens galaxies |
| title_short | On the density profile of dark matter substructure in gravitational lens galaxies |
| title_sort | on the density profile of dark matter substructure in gravitational lens galaxies |
| url | http://hdl.handle.net/1721.1/98447 https://orcid.org/0000-0001-8593-7692 |
| work_keys_str_mv | AT vegettisimona onthedensityprofileofdarkmattersubstructureingravitationallensgalaxies AT vogelsbergermark onthedensityprofileofdarkmattersubstructureingravitationallensgalaxies |