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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…
On the Metallicities and Kinematics of the Circumgalactic Media of Damped Ly Systems at
Stephanie M. Urbano Stawinski, Kate H. R. Rubin, J. Xavier Prochaska +7
We use medium- and high-resolution spectroscopy of close pairs of quasars to analyze the circumgalactic medium (CGM) surrounding 32 damped Ly absorption systems (DLAs). The prim…
The Hubble Space Telescope Survey of M31 Satellite Galaxies II. The Star Formation Histories of Ultra-Faint Dwarf Galaxies
A. Savino, D. R. Weisz, E. D. Skillman +34
We present the lifetime star formation histories (SFHs) for six ultra-faint dwarf (UFD; , ) satellite galaxies of M31 based on…
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…
The JWST Resolved Stellar Populations Early Release Science Program II. Survey Overview
Daniel R. Weisz, Kristen B. W. McQuinn, Alessandro Savino +39
We present the JWST Resolved Stellar Populations Early Release Science (ERS) science program. We obtained 27.5 hours of NIRCam and NIRISS imaging of three targets in the Local Grou…
The Stellar Kinematics of Void Dwarf Galaxies Using KCWI
Mithi A. C. de los Reyes, Evan N. Kirby, Zhuyun Zhuang +3
Dwarf galaxies located in extremely under-dense cosmic voids are excellent test-beds for disentangling the effects of large-scale environment on galaxy formation and evolution. We…
A Comprehensive Investigation of Metals in the Circumgalactic Medium of Nearby Dwarf Galaxies
Yong Zheng, Yakov Faerman, Benjamin D. Oppenheimer +7
Dwarf galaxies are found to have lost most of their metals via feedback processes; however, there still lacks consistent assessment on the retention rate of metals in their circumg…
A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at with Keck Deep Spectroscopy
Zhuyun Zhuang, Nicha Leethochawalit, Evan N. Kirby +13
Gravitational lenses can magnify distant galaxies, allowing us to discover and characterize the stellar populations of intrinsically faint, quiescent galaxies that are otherwise ex…
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…
A non-interacting Galactic black hole candidate in a binary system with a main-sequence star
Sukanya Chakrabarti, Joshua D. Simon, Peter A. Craig +10
We describe the discovery of a solar neighborhood (d=468 pc) binary system with a main-sequence sunlike star and a massive non-interacting black hole candidate. The spectral energy…
The Hubble Space Telescope Survey of M31 Satellite Galaxies I. RR Lyrae-based Distances and Refined 3D Geometric Structure
Alessandro Savino, Daniel R. Weisz, Evan D. Skillman +33
We measure homogeneous distances to M31 and 38 associated stellar systems (16.8 6.0), using time-series observations of RR Lyrae stars taken as part of the Hubbl…
Structural parameters and possible association of the Ultra-Faint Dwarfs Pegasus III and Pisces II from deep Hubble Space Telescope photometry
Hannah Richstein, Ekta Patel, Nitya Kallivayalil +17
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf (UFD) galaxies Pegasus III (Peg III) and Pisces II (Psc II), two of the most distant satellites in…
Simultaneous Constraints on the Star Formation History and Nucleosynthesis of Sculptor dSph
Mithi A. C. de los Reyes, Evan N. Kirby, Alexander P. Ji +1
We demonstrate that using up to seven stellar abundance ratios can place observational constraints on the star formation histories (SFHs) of Local Group dSphs, using the Sculptor d…
Star Formation Histories of Ultra-Faint Dwarf Galaxies: environmental differences between Magellanic and non-Magellanic satellites?
Elena Sacchi, Hannah Richstein, Nitya Kallivayalil +18
We present the color-magnitude diagrams and star formation histories (SFHs) of seven ultra-faint dwarf galaxies: Horologium 1, Hydra 2, Phoenix 2, Reticulum 2, Sagittarius 2, Trian…
Stellar kinematics of dwarf galaxies from multi-epoch spectroscopy: application to Triangulum II
Rachel Buttry, Andrew B. Pace, Sergey E. Koposov +9
We present new MMT/Hectochelle spectroscopic measurements for 257 stars observed along the line of sight to the ultra-faint dwarf galaxy Triangulum II. Combining with results from…
NGC 147 Corroborates the Break in the Stellar Mass-Stellar Metallicity Relation for Galaxies
Zhuyun Zhuang, Evan N. Kirby, Nicha Leethochawalit +1
The stellar mass-stellar metallicity relation (MZR) is an essential approach to probe the chemical evolution of galaxies. It reflects the balance between galactic feedback and grav…
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…
Characterizing the Circumgalactic Medium of the Lowest-Mass Galaxies: A Case Study of IC 1613
Yong Zheng, Andrew Emerick, Mary E. Putman +3
Using 10 sightlines observed with the Hubble Space Telescope/Cosmic Origins Spectrograph, we study the circumgalactic medium (CGM) and outflows of IC1613, which is a low-mass ($M_*…
NGC 6822 as a probe of dwarf galactic evolution
Brent Belland, Evan Kirby, Michael Boylan-Kolchin +1
NGC 6822 is the closest isolated dwarf irregular galaxy to the Milky Way. Its proximity and stellar mass (, large for a dwarf galaxy) allow for a detailed study of it…
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 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…
Elemental abundances in M31: [Fe/H] and [α/Fe] in M31 Dwarf Galaxies Using Coadded Spectra
Jennifer Wojno, Karoline M. Gilbert, Evan N. Kirby +5
We present chemical abundances of red giant branch (RGB) stars in the dwarf spheroidal (dSph) satellite system of Andromeda (M31), using spectral synthesis of medium resolution (R…
Multiple Chemodynamic Stellar Populations of the Ursa Minor Dwarf Spheroidal Galaxy
Andrew B. Pace, Manoj Kaplinghat, Evan Kirby +6
We present a Bayesian method to identify multiple (chemodynamic) stellar populations in dwarf spheroidal galaxies (dSphs) using velocity, metallicity, and positional stellar data w…
Elemental Abundances in M31: The Kinematics and Chemical Evolution of Dwarf Spheroidal Satellite Galaxies
Evan N. Kirby, Karoline M. Gilbert, Ivanna Escala +4
We present deep spectroscopy from Keck/DEIMOS of Andromeda I, III, V, VII, and X, all of which are dwarf spheroidal satellites of M31. The sample includes 256 spectroscopic members…