Extremely Red Objects in a Hierarchical Universe

Baugh, C.M.; Lacey, C.G.; Almeida, C.; Gonzalez-Perez, V.

Abstract

We analyse whether hierarchical formation models based on Λ Cold Dark Matter Cosmology can produce enough massive red galaxies to match observations. For this purpose, we compare observations with the predictions from two published models for the abundance and redshift distribution of Extremely Red Objects (EROs; red, massive, galaxies observed at z ≥ 1). One of the models invokes superwinds to regulate star formation in massive haloes, whilst the other suppresses cooling through radio-mode AGN feedback. The first one underestimates the number counts of EROs by an order of magnitude, whereas the radio-mode AGN feedback model gives excellent agreement with the number counts of EROs and redshift distribution of K-selected galaxies. This study highlights the need to consider AGN feedback in order to understand the formation and evolution of massive galaxies at z ≥ 1.

Citation

Baugh, C., Lacey, C., Almeida, C., & Gonzalez-Perez, V. (2010, December). Extremely Red Objects in a Hierarchical Universe. Presented at Highlights of Spanish Astrophysics V, Santander

• Presentation Conference Type: Conference Paper (published)
• Conference Name: Highlights of Spanish Astrophysics V
• Online Publication Date: Feb 25, 2010
• Publication Date: 2010
• Deposit Date: Jan 31, 2012
• Publisher: Springer Verlag
• Series Title: Astrophysics and Space Science Proceedings
• Book Title: Highlights of Spanish Astrophysics V
• ISBN: 9783642112492
• DOI: https://doi.org/10.1007/978-3-642-11250-8_48
• Public URL: https://durham-repository.worktribe.com/output/1158328
• Related Public URLs: http://adsabs.harvard.edu/abs/2010hsa5.conf..297G