Properties of Extremely Red Objects in an Overdense Region
نویسندگان
چکیده
منابع مشابه
On the colour-colour properties of the Extremely Red Objects
The colours of the galaxy class known as Extremely Red Objects (EROs; R− K > 5) are considered to be consistent with two distinct galaxy populations at high redshift: evolved ellipticals or young dusty starbursts. In this paper the properties of EROs, spanned by the five photometric bands RIJHK, are investigated as to the possibility to distinguish between these two galaxy populations using onl...
متن کاملMassive , 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 کاملExtremely Red Objects in the Lockman Hole
We investigate extremely red objects (EROs) using nearand mid-infrared observations in five passbands (3.6 to 24 m) obtained from the Spitzer Space Telescope, and deep ground-based R and K imaging. The great sensitivity of the Infrared Array Camera (IRAC) camera allows us to detect 64 EROs (a surface density of 2:90 0:36 arcmin ; 1⁄23:6 AB < 23:7) in only 12 minutes of IRAC exposure time, by me...
متن کاملAn XMM–Newton survey of Extremely Red Objects
We present preliminary results of a 25 ks XMM–Newton observation of the largest sample of Extremely Red Objects (EROs) available to date (∼450 sources), selected in a contiguous area of ∼ 700 arcmin (Daddi et al. 2000). Five of the 36 hard X–ray selected sources brighter than 7× 10 erg cm s in the 2–10 keV band, are associated with EROs. All of the X–ray detected EROs show rather extreme X–ray–...
متن کاملThe Morphology of Extremely Red Objects
We briefly discuss our survey of Extremely Red Objects (EROs) with HST/NICMOS and deep ground-based images and summarize its results. We use the high-resolution NICMOS images to sub-divide EROs into morphological classes, tentatively arguing that about 60 % of EROs (18 out of 30) are early-type galaxies. About 20 % (6 out of 30 objects) appear to be flattened disk systems. Another 10 % (3 out o...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2005
ISSN: 0004-637X,1538-4357
DOI: 10.1086/430466