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Euclid preparation. LXXXVI. Cosmic Dawn Survey: Evolution of the galaxy stellar mass function across 0.2 < z łeq 6.5 measured over 10 square degrees

Euclid Collaboration L. Zalesky J. Weaver C. McPartland G. Murphree I. Valdes +495 lainnya
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Abstrak

The Cosmic Dawn Survey pre-launch catalogues cover an effective 10.13 deg 2 $ area with uniform deep /IRAC data (m Spitzer mag, 5σ), the largest area covered to these depths at IR wavelengths. We used these data to gain new insight into the growth of stellar mass across cosmic history by characterising the evolution of the galaxy stellar mass function through 0.2 3 and significantly reduces cosmic variance, thus yielding strong constraints on the abundance of galaxies above the characteristic stellar mass ( $^⋆) across this ten billion year period. The evolution of the galaxy stellar mass function is generally consistent with results from the literature but now provides firm estimates of the number density where only upper limits were previously available. Contrasting the galaxy stellar mass function with the dark matter halo mass function suggests that massive galaxies (mathcal M 11 M_⊙) at z > 3.5 required integrated star-formation efficiencies of mathcal M /( _ M ̊m h f_ ̊m b ) ≳ 0.25--0.5, in excess of the commonly held view of a `universal peak efficiency' from studies on the stellar-to-halo mass relation. Such increased efficiencies imply an evolving peak in the stellar-to-halo mass relation at z > 3.5 that can be maintained if feedback mechanisms from active galactic nuclei and stellar processes are ineffective at early times. In addition, a significant fraction of the most massive quiescent galaxies are observed to be in place by z∼ 2.5--3. The apparent lack of change in their number density by z∼ 0.2 is consistent with relatively little mass growth from mergers. Utilising the unique volume, we find evidence of an environmental dependence of the galaxy stellar mass function all the way through z∼ 3.5 for the first time, though a more careful characterisation of the density field is ultimately required for confirmation.

Topik & Kata Kunci

Physics

Penulis (500)

E

Euclid Collaboration L. Zalesky

J

J. Weaver

C

C. McPartland

G

G. Murphree

I

I. Valdes

C

C. Jespersen

S

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A

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D

D. O. Astronomy

U

U. Massachusetts

A

Amherst

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C

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D

Denmark.

N

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U

U. Copenhagen

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2

2200 Copenhagen

D

D. Sciences

P

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P

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P

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N

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A

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F

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Institute Lorentz

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2. NielsBohrweg

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20133 Milano

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Format Sitasi

APA MLA BibTeX
Zalesky, E.C.L., Weaver, J., McPartland, C., Murphree, G., Valdes, I., Jespersen, C. et al. (2025). Euclid preparation. LXXXVI. Cosmic Dawn Survey: Evolution of the galaxy stellar mass function across 0.2 < z łeq 6.5 measured over 10 square degrees. https://doi.org/10.1051/0004-6361/202555728

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Informasi Jurnal
Tahun Terbit
2025
Bahasa
en
Sumber Database
Semantic Scholar
DOI
10.1051/0004-6361/202555728
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Open Access ✓