Massive, red galaxies in a hierarchical universe - I. Counts of extremely red objects and basic properties
نویسندگان
چکیده
منابع مشابه
Massive , red galaxies in a hierarchical universe - I Counts of Extremely Red Objects and basic properties
We present predictions for the abundance and nature of Extremely Red Objects (EROs) in the Λ cold dark matter model. EROs are red, massive galaxies observed at z ≥ 1 and their numbers and properties pose a challenge to hierarchical galaxy formation models. We compare the predictions from two published models, one of which invokes a “superwind” to regulate star formation in massive haloes and th...
متن کاملMassive, red galaxies in a hierarchical universe – II. Clustering of Extremely Red Objects
We present predictions for the clustering of Extremely Red Objects (EROs) in a cold dark matter universe, using a semi-analytical galaxy formation model in combination with a cosmological N-body simulation. EROs are red, massive galaxies observed at 0.7 z 3, and their numbers and properties have posed a challenge to hierarchical galaxy formation models. We analyse the halo occupation distributi...
متن کاملCounts of Bright Extremely Red Objects : Evolved Massive Galaxies at z ∼ 1
We present results on number counts of Extremely Red Objects (EROs) in a 2850 arcmin 2 near-infrared survey performed in European Large Area ISO Survey (ELAIS) fields at K < 17.5. Counts of EROs are extended to brighter levels than available previously, giving 0.002 ± 0.001arcmin −2 at K < 16.5 and consistent numbers with literature values at fainter magnitudes. Photometric redshifts from HYPER...
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چکیده: در این تحقیق، برخی خواص فیزیکی و مکانیکی لوبیا قرمز به-صورت تابعی از محتوی رطوبت بررسی شد. نتایج نشان داد که رطوبت بر خواص فیزیکی لوبیا قرمز شامل طول، عرض، ضخامت، قطر متوسط هندسی، قطر متوسط حسابی، سطح تصویر شده، حجم، چگالی توده، تخلخل، وزن هزار دانه و زاویه ی استقرار استاتیکی در سطح احتمال 1 درصد اثر معنی داری دارد. به طوری که با افزایش رطوبت از 54/7 به 12 درصد بر پایه خشک طول، عرض، ضخام...
15 صفحه اولExtremely Red Radio Galaxies
At least half the radio galaxies at z > 1 in the 7C Redshift Survey have extremely red colours (R−K > 5), consistent with stellar populations which formed at high redshift (z ∼ 5). We discuss the implications of this for the evolution of massive galaxies in general and for the fraction of near-IR-selected EROs which host AGN, a result which is now being tested by deep, hard X-ray surveys. The c...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2009
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2009.14397.x