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Galactic Archaeology with the Subaru `Ōnohi`ula Prime Focus Spectrograph Strategic Program
Masashi Chiba, Rosemary F. G. Wyse, Evan N. Kirby +48
The recently commissioned Subaru `Ōnohi`ula Prime Focus Spectrograph (PFS) will obtain spectra from nearly 2,400 fibers that cover 1.24 square degrees. The 360 night Subaru Strateg…
A Chemodynamical Census of the Milky Way's Ultra-Faint Compact Satellites. I. A First Population-Level Look at the Internal Kinematics and Metallicities of 19 Extremely-Low-Mass Halo Stellar Systems
William Cerny, Ting S. Li, Andrew B. Pace +13
Deep, wide-area photometric surveys have uncovered a population of compact ( 1-15 pc), extremely-low-mass ( 20-4000 ) stellar systems in th…
The M31-M33 Interaction: Impact on M31's Center of Mass Motion and Satellite Orbits
Ekta Patel, Nicolas Garavito-Camargo, Ivanna Escala
Inspired by recent studies of the Milky Way--LMC interaction and its implications for the Milky Way's global dynamical history, we investigate how the massive satellite galaxy M33…
Kinematical Modeling of the Resolved Stellar Outskirts of M32: Constraints on Tidal Stripping Scenarios
Ivanna Escala, Douglas Grion Filho, Puragra Guhathakurta +8
As the only compact elliptical close enough to resolve into individual stars, the satellite dwarf galaxy M32 provides a unique opportunity for exploring the origins of such rare ga…
IFUM Integrated Field Spectroscopy of Ten M104 Satellite Galaxy Candidates
Ethan Crosby, Mario Mateo, Ivanna Escala +3
We report the spectroscopic analysis of ten satellite galaxy candidates in the sphere of influence of the Sombrero galaxy (M104, NGC4594), based on data obtained with IFUM (Integra…
Eridanus III and DELVE 1: Carbon-rich Primordial Star Clusters or the Smallest Dwarf Galaxies?
Joshua D. Simon, Ting S. Li, Alexander P. Ji +8
We present spectroscopy of the ultra-faint Milky Way satellites Eridanus III (Eri III) and DELVE 1. We identify eight member stars in each satellite and place non-constraining uppe…
Elemental Abundances in And XIX From Coadded Spectra
L. R. Cullinane, Karoline M. Gilbert, Ivanna Escala +6
With a luminosity similar to that of Milky Way dwarf spheroidal (dSph) systems like Sextans, but a spatial extent similar to that of ultradiffuse galaxies (UDGs), Andromeda (And) X…
The structure of the stellar halo of the Andromeda galaxy explored with the NB515 for Subaru/HSC. I.: New Insights on the stellar halo up to 120 kpc
Itsuki Ogami, Mikito Tanaka, Yutaka Komiyama +16
We analyse the M31 halo and its substructure within a projected radius of 120 kpc using a combination of Subaru/HSC and CFHT/MegaCam - \& -…
TREX: Kinematic Characterisation of a High-Dispersion Intermediate-Age Stellar Component in M33
L. R. Cullinane, Karoline M. Gilbert, Puragra Guhathakurta +7
The dwarf galaxy Triangulum (M33) presents an interesting testbed for studying stellar halo formation: it is sufficiently massive so as to have likely accreted smaller satellites,…
Chemical Cartography of the Sagittarius Stream with Gaia
Emily C. Cunningham, Jason A. S. Hunt, Adrian M. Price-Whelan +5
The stellar stream connected to the Sagittarius (Sgr) dwarf galaxy is the most massive tidal stream that has been mapped in the Galaxy, and is the dominant contributor to the outer…
RomAndromeda: The Roman Survey of the Andromeda Halo
Arjun Dey, Joan Najita, Carrie Filion +50
As our nearest large neighbor, the Andromeda Galaxy provides a unique laboratory for investigating galaxy formation and the distribution and substructure properties of dark matter…
Optimizing Roman's High Latitude Wide Area Survey for Low Surface Brightness Astronomy
Mireia Montes, Francesca Annibali, Michele Bellazzini +20
One of the last remaining frontiers in optical/near-infrared observational astronomy is the low surface brightness regime (LSB, V-band surface brightness, 27 AB mag/arcsec$^…
The Prevalence of the -bimodality: First JWST -abundance Results in M31
David L. Nidever, Karoline Gilbert, Erik Tollerud +8
We present initial results from our JWST NIRSpec program to study the -abundances in the M31 disk. The Milky Way has two chemically-defined disks, the low- and high- disks…
HALO7D III: Chemical Abundances of Milky Way Halo Stars from Medium Resolution Spectra
Kevin A. McKinnon, Emily C. Cunningham, Constance M. Rockosi +4
The Halo Assembly in Lambda Cold Dark Matter: Observations in 7 Dimensions (HALO7D) survey measures the kinematics and chemical properties of stars in the Milky Way (MW) stellar ha…
Elemental abundances in M31: Individual and Coadded Spectroscopic [Fe/H] and [α/Fe] throughout the M31 Halo with SPLASH
J. Leigh Wojno, Karoline M. Gilbert, Evan N. Kirby +6
We present spectroscopic chemical abundances of red giant branch (RGB) stars in Andromeda (M31), using medium resolution () spectra obtained via the Spectroscopic and Ph…
Spiral Arms are Metal Freeways: Azimuthal Gas-Phase Metallicity Variations in Simulated Cosmological Zoom-in Flocculent Disks
Matthew E. Orr, Blakesley Burkhart, Andrew Wetzel +7
We examine the azimuthal variations in gas-phase metallicity profiles in simulated Milky Way mass disk galaxies from the Feedback in Realistic Environments (FIRE-2) cosmological zo…
Resolved SPLASH Chemodynamics in Andromeda's PHAT Stellar Halo and Disk: On the Nature of the Inner Halo Along the Major Axis
Ivanna Escala, Amanda C. N. Quirk, Puragra Guhathakurta +5
Stellar kinematics and metallicity are key to exploring formation scenarios for galactic disks and halos. In this work, we characterized the relationship between kinematics and pho…
Kinematics and Metallicity of Red Giant Branch Stars in the Northeast Shelf of M31
Ivanna Escala, Karoline M. Gilbert, Mark Fardal +4
We obtained Keck/DEIMOS spectra of 556 individual red giant branch stars in 4 spectroscopic fields spanning projected kpc along the Northeast (NE) shelf of M31. We present…
Reading the CARDs: the Imprint of Accretion History in the Chemical Abundances of the Milky Way's Stellar Halo
Emily C. Cunningham, Robyn E. Sanderson, Kathryn V. Johnston +7
In the era of large-scale spectroscopic surveys in the Local Group (LG), we can explore using chemical abundances of halo stars to study the star formation and chemical enrichment…
Elemental Abundances in M31: Gradients in the Giant Stellar Stream
Ivanna Escala, Karoline M. Gilbert, Jennifer Wojno +2
We analyze existing measurements of [Fe/H] and [/Fe] for individual red giant branch (RGB) stars in the Giant Stellar Stream (GSS) of M31 to determine whether spatial abundance…
Gas infall and radial transport in cosmological simulations of Milky Way-mass disks
Cameron Trapp, Dusan Keres, T. K. Chan +7
Observations indicate that a continuous supply of gas is needed to maintain observed star formation rates in large, disky galaxies. To fuel star formation, gas must reach the inner…
Elemental Abundances in M31: Properties of the Inner Stellar Halo
Ivanna Escala, Evan N. Kirby, Karoline M. Gilbert +3
We present measurements of [Fe/H] and [/Fe] for 128 individual red giant branch stars (RGB) in the stellar halo of M31, including its Giant Stellar Stream (GSS), obtained using…
Elemental Abundances in the Local Group: Tracing the Formation History of the Great Andromeda Galaxy
Ivanna A. Escala
The Local Group (LG) is an environment accessible to detailed studies of galaxy formation, providing a complement to the early universe. In particular, spectroscopy of resolved ste…
Elemental Abundances in M31: Iron and Alpha Element Abundances in M31's Outer Halo
Karoline M. Gilbert, Jennifer Wojno, Evan N. Kirby +4
We present [Fe/H] and [/Fe] abundances, derived using spectral synthesis techniques, for stars in M31's outer stellar halo. The 21 [Fe/H] measurements and 7 [/Fe] measurement…