ABSTRACT The cosmological inflow of a galaxy is speculated to be able to enter the galaxy and enhance the star formation rate (SFR) and black hole accretion rate (BHAR). In this paper, by performing high-resolution hydrodynamic simulations in the framework of macer, we investigate the fate of the inflow and its impacts on the evolution of a massive elliptical galaxy. The inflow properties are adopted from the cosmological simulation IllustrisTNG. We find that the inflow gas hardly enters but is blocked beyond ∼20 kpc from the central galaxy and becomes part of the circumgalactic medium (CGM). The gas pressure gradient, mainly contributed by the thermalized stellar wind and subdominant contributed by the energy input from the active galactic nuclei (AGNs), balances gravity and prevents the inflow from entering the galaxy. The SFR and BHAR are almost not affected by the normal inflow. However, if the rate of cosmological inflow were increased by a factor of 3, a small fraction of the inflow would enter the galaxy and contribute about 10 per cent of the gas in the galaxy. In this case, the gas density in the galaxy would increase by a factor of $\gtrsim$20. This increase is not because of the additional gas supply by the inflow but due to the increase of gas density and pressure in the CGM caused by the inflow. Consequently, the SFR and BHAR would increase by a factor of ∼5 and ∼1000, respectively. Finally, AGN feedback can perturb the motion of the inflow and heat the CGM through its intermittent outbursts.

More from our Archive

• DOI: 10.1093/mnras/stad1984 2023

  Analysing the large-scale bulk flow using cosmicflows4: increasing tension with the standard cosmological model

  Richard Watkins, Trey Allen, Collin James Bradford, Albert Ramon, Alexandra Walker, Hume A Feldman, Rachel Cionitti, Yara Al-Shorman, Ehsan Kourkchi, R Brent Tully

• DOI: 10.1093/mnras/stad2032 2023

  <i>JWST</i> early Universe observations and ΛCDM cosmology

  Rajendra P Gupta

• DOI: 10.1093/mnras/stad2046 2023

  Feedback reshapes the baryon distribution within haloes, in halo outskirts, and beyond: the closure radius from dwarfs to massive clusters

  Mohammadreza Ayromlou, Dylan Nelson, Annalisa Pillepich

• DOI: 10.1029/2022je007612 2023

  Mineralogy, Morphology, and Emplacement History of the Maaz Formation on the Jezero Crater Floor From Orbital and Rover Observations

  Briony Horgan, Arya Udry, Melissa Rice, Sanna Alwmark, Hans E. F. Amundsen, James F. Bell, Larry Crumpler, Brad Garczynski, Jeff Johnson, Kjartan Kinch, Lucia Mandon, Marco Merusi, Chase Million, Jorge I. Núñez, Patrick Russell, Justin I. Simon, Michael St. Clair, Kathryn M. Stack, Alicia Vaughan, Brittan Wogsland, Andrew Annex, Andreas Bechtold, Tor Berger, Olivier Beyssac, Adrian Brown, Ed Cloutis, Barbara A. Cohen, Sarah Fagents, Linda Kah, Ken Farley, David Flannery, Sanjeev Gupta, Svein‐Erik Hamran, Yang Liu, Gerhard Paar, Cathy Quantin‐Nataf, Nicolas Randazzo, Eleni Ravanis, Steven Sholes, David Shuster, Vivian Sun, Christian Tate, Nick Tosca, Meenakshi Wadhwa, Roger C. Wiens

• DOI: 10.1093/mnras/stad2013 2023

  The Dark Energy Survey Year 3 and eBOSS: constraining galaxy intrinsic alignments across luminosity and colour space

  S Samuroff, R Mandelbaum, J Blazek, A Campos, N MacCrann, G Zacharegkas, A Amon, J Prat, S Singh, J Elvin-Poole, A J Ross, A Alarcon, E Baxter, K Bechtol, M R Becker, G M Bernstein, A Carnero Rosell, M Carrasco Kind, R Cawthon, C Chang, R Chen, A Choi, M Crocce, C Davis, J DeRose, S Dodelson, C Doux, A Drlica-Wagner, K Eckert, S Everett, A Ferté, M Gatti, G Giannini, D Gruen, R A Gruendl, I Harrison, K Herner, E M Huff, M Jarvis, N Kuropatkin, P-F Leget, P Lemos, J McCullough, J Myles, A Navarro-Alsina, S Pandey, A Porredon, M Raveri, M Rodriguez-Monroy, R P Rollins, A Roodman, G Rossi, E S Rykoff, C Sánchez, L F Secco, I Sevilla-Noarbe, E Sheldon, T Shin, M A Troxel, I Tutusaus, N Weaverdyck, B Yanny, B Yin, Y Zhang, J Zuntz, M Aguena, O Alves, J Annis, D Bacon, E Bertin, S Bocquet, D Brooks, D L Burke, J Carretero, M Costanzi, L N da Costa, M E S Pereira, J De Vicente, S Desai, H T Diehl, J P Dietrich, P Doel, I Ferrero, B Flaugher, J Frieman, J García-Bellido, S R Hinton, D L Hollowood, K Honscheid, D J James, K Kuehn, O Lahav, J L Marshall, P Melchior, J Mena-Fernández, F Menanteau, R Miquel, J Newman, A Palmese, A Pieres, A A Plazas Malagón, E Sanchez, V Scarpine, M Smith, E Suchyta, M E C Swanson, G Tarle, C To,

• DOI: 10.3390/life13071472 2023

  Exploring the Frontiers of Neuroimaging: A Review of Recent Advances in Understanding Brain Functioning and Disorders

  Chiahui Yen, Chia-Li Lin, Ming-Chang Chiang

• DOI: 10.1093/mnras/stad2101 2023

  Jellyfish galaxies with the IllustrisTNG simulations – when, where, and for how long does ram pressure stripping of cold gas occur?

  Eric Rohr, Annalisa Pillepich, Dylan Nelson, Elad Zinger, Gandhali D Joshi, Mohammadreza Ayromlou

• DOI: 10.1093/mnras/stad2087 2023

  MUSE Analysis of Gas around Galaxies (MAGG) – V. Linking ionized gas traced by C <scp>iv</scp> and Si <scp>iv</scp> absorbers to Ly α emitting galaxies at <i>z</i> ≈ 3.0–4.5

  Marta Galbiati, Michele Fumagalli, Matteo Fossati, Emma K Lofthouse, Rajeshwari Dutta, J Xavier Prochaska, Michael T Murphy, Sebastiano Cantalupo

• DOI: 10.1093/mnras/stad2001 2023

  Identifying the SN 2022acko progenitor with <i>JWST</i>

  Schuyler D Van Dyk, K Azalee Bostroem, WeiKang Zheng, Thomas G Brink, Ori D Fox, Jennifer E Andrews, Alexei V Filippenko, Yize Dong, Emily Hoang, Griffin Hosseinzadeh, Daryl Janzen, Jacob E Jencson, Michael J Lundquist, Nicolas Meza, Dan Milisavljevic, Jeniveve Pearson, David J Sand, Manisha Shrestha, Stefano Valenti, D Andrew Howell

• DOI: 10.1093/mnras/stad2031 2023

  The halo mass function and filaments in full cosmological simulations with fuzzy dark matter

  Simon May, Volker Springel