The colours of satellite galaxies in the Illustris simulation by Sales, Laura V., Vogelsberger, Mark, Genel, Shy, Nelson, Dylan, Rodriguez-Gomez, Vicente, Wang, Wenting, Pillepich, Annalisa, Sijacki, Debora, Springel, Volker, Hernquist, Lars, Torrey, Paul A.

“…Observationally, the fraction of blue satellite galaxies decreases steeply with host halo mass, and their radial distribution around central galaxies is significantly shallower in massive (M[subscript *] ≥ 10[superscript 11] M[subscript ⊙]) than in Milky Way-like systems. …”
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The Formation History of Subhalos and the Evolution of Satellite Galaxies by Shi, Jingjing, Wang, Huiyuan, Mo, Houjun, Vogelsberger, Mark, Ho, Luis C, Du, Min, Nelson, Dylan, Pillepich, Annalisa, Hernquist, Lars

“…We use a scaled formation time (anf) to characterize the mass assembly histories of the subhalos before they are accreted by massive host halos. We find that satellite galaxies in young subhalos ((lownf) are less massive and more gas-rich and have stronger star formation and a higher fraction of ex situ stellar mass than satellites in old subhalos (high anf). …”
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The Formation History of Subhalos and the Evolution of Satellite Galaxies by Shi, Jingjing, Wang, Huiyuan, Mo, Houjun, Vogelsberger, Mark, Ho, Luis C., Du, Min, Nelson, Dylan, Pillepich, Annalisa, Hernquist, Lars

“…We use a scaled formation time (anf) to characterize the mass assembly histories of the subhalos before they are accreted by massive host halos. We find that satellite galaxies in young subhalos ((lownf) are less massive and more gas-rich and have stronger star formation and a higher fraction of ex situ stellar mass than satellites in old subhalos (high anf). …”
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Phase-Space Correlations among Systems of Satellite Galaxies by Marcel S. Pawlowski

“…At the same time, other kinds of correlations have been found to be more in line with cosmological expectations—specifically, lopsided satellite galaxy systems and the accretion of groups of satellite galaxies. …”
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Resolved Star Formation in TNG100 Central and Satellite Galaxies by Bryanne McDonough, Olivia Curtis, Tereasa G. Brainerd

“…We find that, on average, high-mass central and satellite galaxies quench from the inside out, while low-mass central and satellite galaxies have similar, flatter profiles. …”
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Evidence for a Massive Andromeda Galaxy Using Satellite Galaxy Proper Motions by Ekta Patel, Kaisey S. Mandel

“…We present new mass estimates for Andromeda (M31) using the orbital angular momenta of four satellite galaxies (M33, NGC 185, NGC 147, and IC 10) derived from existing proper motions, distances, and line-of-sight velocities. …”
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Anisotropic Satellite Galaxy Quenching: A Unique Signature of Energetic Feedback by Supermassive Black Holes? by Juliana S. M. Karp, Johannes U. Lange, Risa H. Wechsler

“…This effect, called anisotropic satellite galaxy quenching (ASGQ), has been found in observational data and cosmological simulations. …”
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When and How Ram Pressure Stripping in Low-mass Satellite Galaxies Enhances Star Formation by Jingyao Zhu, Stephanie Tonnesen, Greg L. Bryan

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SDSS-IV MaNGA: The Effect of Stellar Mass and Halo Mass on the Assembly Histories of Satellite Galaxies by Grecco A. Oyarzún, Kevin Bundy, Kyle B. Westfall, Ivan Lacerna, Renbin Yan, J. R. Brownstein, Niv Drory, Richard R. Lane

“…These signals lend support to environmentally driven processes that quench satellite galaxies, although variations in the merger histories of central and satellite galaxies also emerge as a viable explanation.…”
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The Hubble Space Telescope Survey of M31 Satellite Galaxies. II. The Star Formation Histories of Ultrafaint Dwarf Galaxies by Alessandro Savino, Daniel R. Weisz, Evan D. Skillman, Andrew Dolphin, Andrew A. Cole, Nitya Kallivayalil, Andrew Wetzel, Jay Anderson, Gurtina Besla, Michael Boylan-Kolchin, Thomas M. Brown, James S. Bullock, Michelle L. M. Collins, M. C. Cooper, Alis J. Deason, Aaron L. Dotter, Mark Fardal, Annette M. N. Ferguson, Tobias K. Fritz, Marla C. Geha, Karoline M. Gilbert, Puragra Guhathakurta, Rodrigo Ibata, Michael J. Irwin, Myoungwon Jeon, Evan N. Kirby, Geraint F. Lewis, Dougal Mackey, Steven R. Majewski, Nicolas Martin, Alan McConnachie, Ekta Patel, R. Michael Rich, Joshua D. Simon, Sangmo Tony Sohn, Erik J. Tollerud, Roeland P. van der Marel

“…We present the lifetime star formation histories (SFHs) for six ultrafaint dwarf (UFD; M _V > − 7.0, $4.9\lt {\mathrm{log}}_{10}({M}_{* }(z=0)/{M}_{\odot })\lt 5.5$ ) satellite galaxies of M31 based on deep color–magnitude diagrams constructed from Hubble Space Telescope imaging. …”
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The AGORA High-resolution Galaxy Simulations Comparison Project. V. Satellite Galaxy Populations in a Cosmological Zoom-in Simulation of a Milky Way–Mass Halo by Minyong Jung, Santi Roca-Fàbrega, Ji-hoon Kim, Anna Genina, Loic Hausammann, Hyeonyong Kim, Alessandro Lupi, Kentaro Nagamine, Johnny W. Powell, Yves Revaz, Ikkoh Shimizu, Héctor Velázquez, Daniel Ceverino, Joel R. Primack, Thomas R. Quinn, Clayton Strawn, Tom Abel, Avishai Dekel, Bili Dong, Boon Kiat Oh, Romain Teyssier, The AGORA Collaboration

“…When we consider only the halos containing stellar particles at z ∼ 2, the number of satellite galaxies is significantly fewer than that of dark matter halos in all participating AGORA simulations and is comparable to the number of present-day satellites near the Milky Way or M31. …”
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Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension by Gillian D. Beltz-Mohrmann, Adam O. Szewciw, Andreas A. Berlind, Manodeep Sinha

“…In addition, we find evidence for satellite galaxy velocity bias at the 99.9% confidence level. …”
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Machine Learning the Dark Matter Halo Mass of Milky Way-Like Systems by Elaheh Hayati, Peter Behroozi, Ekta Patel

“…This method uses only observable information including satellite orbits, distances to nearby larger halos, and the maximum circular velocity of the largest satellite galaxy. In this paper, we demonstrate a proof-of-concept method on simulated dark matter halos; in future papers in this series, we will apply neural networks to estimate the masses of the Milky Way's and M31's dark matter halos, and we will train variations of these networks to estimate other halo properties including concentration, assembly history, and spin axis.…”
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Simulations of Neutrino and Gamma-Ray Production from Relativistic Black-Hole Microquasar Jets by Theodora Papavasileiou, Odysseas Kosmas, Ioannis Sinatkas

“…After assessing the suitability and sensitivity of the derived (for this purpose) algorithms on the Galactic MQs SS 433 and Cyg X-1, as a concrete extragalactic binary system, we examine the LMC X-1 located in the Large Magellanic Cloud, a satellite galaxy of our Milky Way Galaxy. It is worth mentioning that, for the companion O star (and its extended nebula structure) of the LMC X-1 system, new observations using spectroscopic data from VLT/UVES have been published a few years ago.…”
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The missing satellite problem in 3D by Nierenberg, A. M., Treu, T., Menci, N., Lu, Y., Torrey, Paul A., Vogelsberger, Mark

“…It is widely believed that the large discrepancy between the observed number of satellite galaxies and the predicted number of dark subhaloes can be resolved via a variety of baryonic effects which suppress star formation in low-mass haloes. …”
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Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy by Chiti, Anirudh, Frebel, Anna, Jerjen, Helmut, Kim, Dongwon, Norris, John E

“…We present a study of the ultra-faint Milky Way dwarf satellite galaxy Tucana II using deep photometry from the 1.3 m SkyMapper telescope at Siding Spring Observatory, Australia. …”
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The Hestia project: simulations of the Local Group by Libeskind, Noam I, Carlesi, Edoardo, Grand, Robert JJ, Khalatyan, Arman, Knebe, Alexander, Pakmor, Ruediger, Pilipenko, Sergey, Pawlowski, Marcel S, Sparre, Martin, Tempel, Elmo, Wang, Peng, Courtois, Hélène M, Gottlöber, Stefan, Hoffman, Yehuda, Minchev, Ivan, Pfrommer, Christoph, Sorce, Jenny G, Springel, Volker, Steinmetz, Matthias, Tully, R Brent, Vogelsberger, Mark, Yepes, Gustavo

“…The simulated Local Group galaxies resemble the Milky Way and Andromeda in terms of their halo mass, mass ratio, stellar disc mass, morphology separation, relative velocity, rotation curves, bulge-disc morphology, satellite galaxy stellar mass function, satellite radial distribution, and in some cases, the presence of a Magellanic cloud like object. …”
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THE 300 km s[superscript –1] STELLAR STREAM NEAR SEGUE 1: INSIGHTS FROM HIGH-RESOLUTION SPECTROSCOPY OF ITS BRIGHTEST STAR by Lunnan, Ragnhild, Casey, Andrew R., Norris, John E., Wyse, Rosemary F. G., Gilmore, Gerard, Frebel, Anna L.

“…We present a chemical abundance analysis of 300S-1, the brightest likely member star of the 300 km s[superscript –1] stream near the faint satellite galaxy Segue 1. From a high-resolution Magellan/MIKE spectrum, we determine a metallicity of [Fe/H] = –1.46 ± 0.05 ± 0.23 (random and systematic uncertainties) for star 300S-1, and find an abundance pattern similar to typical halo stars at this metallicity. …”
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Massive Hypervelocity Runaway Stars in the Large Magellanic Cloud by Zehao Lin, Ye Xu, Chaojie Hao, Yingjie Li, Dejian Liu, Shuaibo Bian

“…As the largest and closest face-on satellite galaxy of the Milky Way, the Large Magellanic Cloud (LMC) serves as a good target, allowing us to study this issue. …”
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Systematically Measuring Ultradiffuse Galaxies (SMUDGes). IV. Ultradiffuse Satellites of Milky Way Analogs by Hina Goto, Dennis Zaritsky, Ananthan Karunakaran, Richard Donnerstein, David J. Sand

“…We find that: (1) the projected radial distribution of UDG satellites (projected surface density ∝ r ^−0.84±0.06 ) is consistent with that of normal satellite galaxies; (2) the number of UDG satellites per MWA ( S _UDG ) is ∼0.5 ± 0.1 over projected radii from 20 to 250 kpc and −17 < M _r < −13.5; (3) S _UDG is consistent with a linear extrapolation of the relationship between the number of UDGs per halo versus halo mass obtained over galaxy group and cluster scales; (4) red UDG satellites dominate the population of UDG satellites (∼80%); (5) over the range of satellite magnitudes studied, UDG satellites comprise ∼10% of the satellite galaxy population of MWAs; and (6) a significant fraction of these (∼13%) have estimated total masses >10 ^10.9 M _⊙ or, equivalently, at least half the halo mass of the LMC, and populate a large fraction (∼18%) of the expected subhalos down to these masses. …”
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