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Title: Halometry from astrometry

Abstract

Halometry—mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo—can be realized via variable weak gravitational lensing of the apparent motions of stars and other luminous background sources. Additionally, modern astrometric surveys provide unprecedented positional precision along with a leap in the number of cataloged objects. Astrometry thus offers a new and sensitive probe of collapsed dark matter structures over a wide mass range, from one millionth to several million solar masses. It opens up a window into the spectrum of primordial curvature fluctuations with comoving wavenumbers between 5 Mpc -1 and 10 5 Mpc -1, scales hitherto poorly constrained. We outline detection strategies based on three classes of observables—multi-blips, templates, and correlations—that take advantage of correlated effects in the motion of many background light sources that are produced through time-domain gravitational lensing. While existing techniques based on single-source observables such as outliers and mono-blips are best suited for point-like lens targets, our methods offer parametric improvements for extended lens targets such as dark matter subhalos. Lastly, multi-blip lensing events may also unveil the existence, location, and mass of planets in the outer reaches of the Solar System, where they would likely have escaped detection bymore » direct imaging.« less

Authors:
 [1];  [2];  [3]
  1. New York Univ. (NYU), NY (United States). Center for Cosmology and Particle Physics and Department of Physics; Inst. for Advanced Study, Princeton, NJ (United States). School of Natural Sciences
  2. New York Univ. (NYU), NY (United States). Center for Cosmology and Particle Physics and Department of Physics
  3. New York Univ. (NYU), NY (United States). Center for Cosmology and Particle Physics and Department of Physics; Flatiron Inst., New York, NY (United States). Center for Computational Astrophysics
Publication Date:
Research Org.:
Inst. for Advanced Study, Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1597003
Grant/Contract Number:  
[SC0009988; PHY-1748958; PHY-1620727]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
[ Journal Volume: 2018; Journal Issue: 07]; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; dark matter theory; galaxy morphology; power spectrum; weak gravitational lensing

Citation Formats

Tilburg, Ken Van, Taki, Anna-Maria, and Weiner, Neal. Halometry from astrometry. United States: N. p., 2018. Web. doi:10.1088/1475-7516/2018/07/041.
Tilburg, Ken Van, Taki, Anna-Maria, & Weiner, Neal. Halometry from astrometry. United States. doi:10.1088/1475-7516/2018/07/041.
Tilburg, Ken Van, Taki, Anna-Maria, and Weiner, Neal. Fri . "Halometry from astrometry". United States. doi:10.1088/1475-7516/2018/07/041. https://www.osti.gov/servlets/purl/1597003.
@article{osti_1597003,
title = {Halometry from astrometry},
author = {Tilburg, Ken Van and Taki, Anna-Maria and Weiner, Neal},
abstractNote = {Halometry—mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo—can be realized via variable weak gravitational lensing of the apparent motions of stars and other luminous background sources. Additionally, modern astrometric surveys provide unprecedented positional precision along with a leap in the number of cataloged objects. Astrometry thus offers a new and sensitive probe of collapsed dark matter structures over a wide mass range, from one millionth to several million solar masses. It opens up a window into the spectrum of primordial curvature fluctuations with comoving wavenumbers between 5 Mpc-1 and 105 Mpc-1, scales hitherto poorly constrained. We outline detection strategies based on three classes of observables—multi-blips, templates, and correlations—that take advantage of correlated effects in the motion of many background light sources that are produced through time-domain gravitational lensing. While existing techniques based on single-source observables such as outliers and mono-blips are best suited for point-like lens targets, our methods offer parametric improvements for extended lens targets such as dark matter subhalos. Lastly, multi-blip lensing events may also unveil the existence, location, and mass of planets in the outer reaches of the Solar System, where they would likely have escaped detection by direct imaging.},
doi = {10.1088/1475-7516/2018/07/041},
journal = {Journal of Cosmology and Astroparticle Physics},
number = [07],
volume = [2018],
place = {United States},
year = {2018},
month = {7}
}

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    Works referencing / citing this record:

    The Spur and the Gap in GD-1: Dynamical Evidence for a Dark Substructure in the Milky Way Halo
    journal, July 2019

    • Bonaca, Ana; Hogg, David W.; Price-Whelan, Adrian M.
    • The Astrophysical Journal, Vol. 880, Issue 1
    • DOI: 10.3847/1538-4357/ab2873