Quantifying the line-of-sight halo contribution to the dark matter convergence power spectrum from strong gravitational lenses
Abstract
Galaxy-galaxy strong gravitational lenses have become a popular probe of dark matter (DM) by providing a window into structure formation on the smallest scales. In particular, the convergence power spectrum of subhalos within lensing galaxies has been suggested as a promising observable to study DM. However, the distances involved in strong-lensing systems are vast, and we expect the relevant volume to contain line-of-sight (LOS) halos that are not associated with the main lens. We develop a formalism to calculate the effect of LOS halos as an effective convergence power spectrum. Here, the multilens plane equation couples the angular deflections of consecutive lens planes, but by assuming that the perturbations due to the LOS halos are small, we show that they can be projected onto the main-lens plane as effective subhalos. We test our formalism by simulating lensing systems using the full multiplane lens equation and find excellent agreement. We show how the relative contribution of LOS halos and subhalos depends on the source and lens redshift, as well as the assumed halo and subhalo mass functions. For a fiducial system with fraction of DM halo mass in substructure fsub = 0.4% for subhalo masses [105–108]M⊙, the interloper contribution to themore »
- Authors:
-
[1];
[1];
[1];
[2];
- Harvard Univ., Cambridge, MA (United States)
- Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Harvard Univ., Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1774906
- Alternate Identifier(s):
- OSTI ID: 1906357
- Grant/Contract Number:
- SC0020223
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 6; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Dark matter; Gravitational lenses; Particle dark matter
Citation Formats
Şengül, Atınç Çaǧan, Tsang, Arthur, Rivero, Ana Diaz, Dvorkin, Cora, Zhu, Hong-Ming, and Seljak, Uroš. Quantifying the line-of-sight halo contribution to the dark matter convergence power spectrum from strong gravitational lenses. United States: N. p., 2020.
Web. doi:10.1103/physrevd.102.063502.
Şengül, Atınç Çaǧan, Tsang, Arthur, Rivero, Ana Diaz, Dvorkin, Cora, Zhu, Hong-Ming, & Seljak, Uroš. Quantifying the line-of-sight halo contribution to the dark matter convergence power spectrum from strong gravitational lenses. United States. https://doi.org/10.1103/physrevd.102.063502
Şengül, Atınç Çaǧan, Tsang, Arthur, Rivero, Ana Diaz, Dvorkin, Cora, Zhu, Hong-Ming, and Seljak, Uroš. Thu .
"Quantifying the line-of-sight halo contribution to the dark matter convergence power spectrum from strong gravitational lenses". United States. https://doi.org/10.1103/physrevd.102.063502. https://www.osti.gov/servlets/purl/1774906.
@article{osti_1774906,
title = {Quantifying the line-of-sight halo contribution to the dark matter convergence power spectrum from strong gravitational lenses},
author = {Şengül, Atınç Çaǧan and Tsang, Arthur and Rivero, Ana Diaz and Dvorkin, Cora and Zhu, Hong-Ming and Seljak, Uroš},
abstractNote = {Galaxy-galaxy strong gravitational lenses have become a popular probe of dark matter (DM) by providing a window into structure formation on the smallest scales. In particular, the convergence power spectrum of subhalos within lensing galaxies has been suggested as a promising observable to study DM. However, the distances involved in strong-lensing systems are vast, and we expect the relevant volume to contain line-of-sight (LOS) halos that are not associated with the main lens. We develop a formalism to calculate the effect of LOS halos as an effective convergence power spectrum. Here, the multilens plane equation couples the angular deflections of consecutive lens planes, but by assuming that the perturbations due to the LOS halos are small, we show that they can be projected onto the main-lens plane as effective subhalos. We test our formalism by simulating lensing systems using the full multiplane lens equation and find excellent agreement. We show how the relative contribution of LOS halos and subhalos depends on the source and lens redshift, as well as the assumed halo and subhalo mass functions. For a fiducial system with fraction of DM halo mass in substructure fsub = 0.4% for subhalo masses [105–108]M⊙, the interloper contribution to the power spectrum is at least several times greater than that of subhalos for source redshifts zs ≳ 0.5. Furthermore, it is likely that for the SLACS and BELLS lenses the interloper contribution dominates: fsub ≳ 2% (4%) is needed for subhalos to dominate in SLACS (BELLS), which is higher than current upper bounds on fsub for our mass range. Since the halo mass function is better understood from first principles, the dominance of interlopers in galaxy-galaxy lenses with high-quality imaging can be seen as a significant advantage when translating this observable into a constraint on DM.},
doi = {10.1103/physrevd.102.063502},
journal = {Physical Review. D.},
number = 6,
volume = 102,
place = {United States},
year = {Thu Sep 10 00:00:00 EDT 2020},
month = {Thu Sep 10 00:00:00 EDT 2020}
}
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