Galaxy formation and evolution

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EDGE: from quiescent to gas-rich to star-forming low-mass dwarf galaxies

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 497:2 (2020) 1508-1520

Authors:

Martin P Rey, Andrew Pontzen, Oscar Agertz, Matthew DA Orkney, Justin I Read, Joakim Rosdahl

Abstract:

ABSTRACT We study how star formation is regulated in low-mass field dwarf galaxies ($10^5 \le M_{\star } \le 10^6 \, \mbox{M}_\mathrm{\odot }$), using cosmological high-resolution ($3 \, \mathrm{pc}$) hydrodynamical simulations. Cosmic reionization quenches star formation in all our simulated dwarfs, but three galaxies with final dynamical masses of $3 \times 10^{9} \, \mbox{M}_\mathrm{\odot }$ are subsequently able to replenish their interstellar medium by slowly accreting gas. Two of these galaxies reignite and sustain star formation until the present day at an average rate of $10^{-5} \, \mbox{M}_\mathrm{\odot } \, \text{yr}^{-1}$, highly reminiscent of observed low-mass star-forming dwarf irregulars such as Leo T. The resumption of star formation is delayed by several billion years due to residual feedback from stellar winds and Type Ia supernovae; even at z = 0, the third galaxy remains in a temporary equilibrium with a large gas content but without any ongoing star formation. Using the ‘genetic modification’ approach, we create an alternative mass growth history for this gas-rich quiescent dwarf and show how a small $(0.2\, \mathrm{dex})$ increase in dynamical mass can overcome residual stellar feedback, reigniting star formation. The interaction between feedback and mass build-up produces a diversity in the stellar ages and gas content of low-mass dwarfs, which will be probed by combining next-generation H i and imaging surveys.
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Simulating gas kinematic studies of high-redshift galaxies with the HARMONI Integral Field Spectrograph

(2020)

Authors:

Mark LA Richardson, Laurence Routledge, Niranjan Thatte, Matthias Tecza, Ryan CW Houghton, Miguel Pereira-Santaella, Dimitra Rigopoulou
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Extinction in the 11.2 micron PAH band and the low L_11.2/L_IR in ULIRGs

(2020)

Authors:

Antonio Hernan-Caballero, Henrik WW Spoon, Almudena Alonso-Herrero, Evanthia Hatziminaoglou, Georgios E Magdis, Pablo G Perez-Gonzalez, Miguel Pereira-Santaella, Santiago Arribas, Isabella Cortzen, Alvaro Labiano, Javier Piqueras, Dimitra Rigopoulou
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Instability in a magnetised collisional plasma driven by a heat flow or a current

Plasma Physics and Controlled Fusion IOP Publishing 62:9 (2020) 095026

Authors:

AR Bell, RJ Kingham, HC Watkins, JH Matthews
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The ALPINE–ALMA [C ii] Survey: Size of Individual Star-forming Galaxies at z = 4–6 and Their Extended Halo Structure

The Astrophysical Journal American Astronomical Society 900:1 (2020) 1

Authors:

Seiji Fujimoto, John D Silverman, Matthieu Bethermin, Michele Ginolfi, Gareth C Jones, Olivier Le Fèvre, Miroslava Dessauges-Zavadsky, Wiphu Rujopakarn, Andreas L Faisst, Yoshinobu Fudamoto, Paolo Cassata, Laura Morselli, Roberto Maiolino, Daniel Schaerer, Peter Capak, Lin Yan, Livia Vallini, Sune Toft, Federica Loiacono, Gianni Zamorani, Margherita Talia, Desika Narayanan, Nimish P Hathi, Brian C Lemaux, Médéric Boquien, Ricardo Amorin, Edo Ibar, Anton M Koekemoer, Hugo Méndez-Hernández, Sandro Bardelli, Daniela Vergani, Elena Zucca, Michael Romano, Andrea Cimatti
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