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New Velocity Measurements of NGC 5128 Globular Clusters out to 130 kpc: Outer Halo Kinematics, Substructure and Dynamics
A. K. Hughes, D. J. Sand, A. Seth +11
We present new radial velocity measurements from the Magellan and the Anglo-Australian Telescopes for 174 previously known and 122 newly confirmed globular clusters (GCs) around NG…
The survey of planetary nebulae in Andromeda (M 31) V. Chemical enrichment of the thin and thicker discs of Andromeda. Oxygen to argon abundance ratios for planetary nebulae and H II regions
Magda Arnaboldi, Souradeep Bhattacharya, Ortwin Gerhard +6
We use oxygen and argon abundances for planetary nebulae (PNe) with low internal extinction (progenitor ages of (>4.5 Gyr) and high extinction (progenitor ages <2.5 Gyr), as well a…
A Ghost in Boötes: The Least Luminous Disrupted Dwarf Galaxy
Vedant Chandra, Charlie Conroy, Nelson Caldwell +9
We report the discovery of Specter, a disrupted ultrafaint dwarf galaxy revealed by the H3 Spectroscopic Survey. We detected this structure via a pair of comoving metal-poor stars…
Young, blue, and isolated stellar systems in the Virgo Cluster. I. 2-D Optical spectroscopy
M. Bellazzini, L. Magrini, M. G. Jones +20
We use panoramic optical spectroscopy obtained with MUSE@VLT to investigate the nature of five candidate extremely isolated low-mass star forming regions (Blue Candidates, BCs here…
Young, blue, and isolated stellar systems in the Virgo Cluster. II. A new class of stellar system
Michael G. Jones, David J. Sand, Michele Bellazzini +21
We discuss five blue stellar systems in the direction of the Virgo cluster, analogous to the enigmatic object SECCO 1 (AGC 226067). These objects were identified based on their opt…
Milky Way's eccentric constituents with , APOGEE GALAH
G. C. Myeong, Vasily Belokurov, David S. Aguado +3
We report the results of an unsupervised decomposition of the local stellar halo in the chemo-dynamical space spanned by the abundance measurements from APOGEE DR17 and GALAH DR3.…