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Measurement of Substructure from the Kinematics of the GD-1 Stellar Stream
Jacob Nibauer, Ana Bonaca, Adrian M. Price-Whelan +2
Stellar streams are sensitive tracers of low-mass dark matter subhalos and provide a means to test the Cold Dark Matter (CDM) paradigm on small scales. In this work, we connect the…
Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT
Bernardita Ried Guachalla, Emmanuel Schaan, Boryana Hadzhiyska +58
The gas density profile around galaxies, shaped by feedback and affecting the galaxy lensing signal, is imprinted on the cosmic microwave background (CMB) by the kinematic Sunyaev-…
The Optical and Infrared Are Connected
Christian K. Jespersen, Peter Melchior, David N. Spergel +3
Galaxies are often modelled as composites of separable components with distinct spectral signatures, implying that different wavelength ranges are only weakly correlated. They are…
: Hamiltonian Perturbation Theory for Stellar Streams in Flexible Potentials with Differentiable Simulations
Jacob Nibauer, Ana Bonaca, David N. Spergel +4
Stellar streams retain a memory of their gravitational interactions with small-scale perturbations. While perturbative models for streams have been formulated in action-angle coord…
Weighing the Milky Way and Andromeda with Artificial Intelligence
Pablo Villanueva-Domingo, Francisco Villaescusa-Navarro, Shy Genel +6
We present new constraints on the masses of the halos hosting the Milky Way and Andromeda galaxies derived using graph neural networks. Our models, trained on thousands of state-of…
An Ultra Deep Field survey with WFIRST
Anton M. Koekemoer, R. J. Foley, D. N. Spergel +69
Studying the formation and evolution of galaxies at the earliest cosmic times, and their role in reionization, requires the deepest imaging possible. Ultra-deep surveys like the HU…
Photometric Selection of a Massive Galaxy Catalog with
Carolina Núñez, David N. Spergel, Shirley Ho
We present the development of a photometrically selected massive galaxy catalog, targeting Luminous Red Galaxies (LRGs) and massive blue galaxies at redshifts . Massive…
Signatures of Kinematic Substructure in the Galactic Stellar Halo
Mariangela Lisanti, David N. Spergel, Piero Madau
Tidal debris from infalling satellites can leave observable structure in the phase-space distribution of the Galactic halo. Such substructure can be manifest in the spatial and/or…
The Gaia inertial reference frame and the tilting of the Milky Way disk
Michael Perryman, David N. Spergel, Lennart Lindegren
While the precise relationship between the Milky Way disk and the symmetry planes of the dark matter halo remains somewhat uncertain, a time-varying disk orientation with respect t…
Direct Detection of Dark Matter Debris Flows
Michael Kuhlen, Mariangela Lisanti, David N. Spergel
Tidal stripping of dark matter from subhalos falling into the Milky Way produces narrow, cold tidal streams as well as more spatially extended "debris flows" in the form of shells,…
Evidence Against Dark Matter Halos Surrounding the Globular Clusters MGC1 and NGC 2419
Charlie Conroy, Abraham Loeb, David Spergel
The conjecture that the ancient globular clusters (GCs) formed at the center of their own dark matter halos was first proposed by Peebles (1984), and has recently been revived to e…
On the Formation of Multiple Stellar Populations in Globular Clusters
Charlie Conroy, David N. Spergel
Nearly all globular clusters (GCs) studied to date show evidence for multiple stellar populations, in stark contrast to the conventional view that GCs are a mono-metallic, coeval p…
Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
B. Gold, N. Odegard, J. L. Weiland +19
[Abridged] We present updated estimates of Galactic foreground emission using seven years of WMAP data. Using the power spectrum of differences between multi-frequency template-cle…
Probing the Galactic Potential with Next-Generation Observations of Disk Stars
T. Sumi, K. V. Johnston, S. Tremaine +2
Near-future surveys promise a dramatic improvement in the number and precision of astrometric, photometric and spectroscopic measurements of stars in the Milky Way's disk. We exami…