Spectral Signatures of Quasar Ages at z ≈ 3
نویسندگان
چکیده
منابع مشابه
A search for signatures of quasar evolution: Comparison of the shapes of the rest-frame optical/UV continua of quasars at z> 3 and z ∼ 0.1 1
A search for signatures of quasar evolution: Comparison of the shapes of the rest-frame optical/UV continua of quasars at z > 3 and z ∼ 0.1 ABSTRACT For 15 bright (V< 17.5), high redshift (z > 3) quasars, we have obtained infrared spectra and photometry, and optical spectrophotometry and photometry, which we use to construct their spectral energy distributions (SEDs) from λ rest ∼ 1285 − 5100Å....
متن کاملBinary Quasars at High Redshift I : 24 New Quasar Pairs at Z ∼ 3 − 4
The clustering of quasars on small scales yields fundamental constraints on models of quasar evolution and the buildup of supermassive black holes. This paper describes the first systematic survey to discover high redshift binary quasars. Using color-selection and photometric redshift techniques, we searched 8142 deg of SDSS imaging data for binary quasar candidates, and confirmed them with fol...
متن کاملCosmological implications of APM 08279 + 5255 , an old quasar at z = 3 . 91
The existence of old high-redshift objects provides an important tool for constraining the expanding age of the Universe and the formation epoch of the first objects. In a recent paper, Hasinger et al. (2002) reported the discovery of the quasar APM 08279+5255 at redshift z = 3.91 with an extremely high iron abundance, and estimated age of 2 3Gyr. By assuming the lower limit for this age estima...
متن کاملCosmological implications of the APM 08279 + 5255 , an old quasar at z = 3 . 91
The existence of old high-redshift objects provides an important tool for constraining the expanding age of the Universe and the formation epoch of the first objects. In a recent paper, Hasinger et al. (2002) reported the discovery of the quasar APM 08279+5255 at redshift z = 3.91 with an extremely high iron abundance, and estimated age of 2 3Gyr. By assuming the lower limit for this age estima...
متن کاملA Study of Quasar Proximity in Ovi absorbers at z=2–3⋆
With the goal of investigating the nature of Ovi absorbers at high redshifts, we study the effects of proximity to the background quasar. In a sample of sixteen quasars at zqso between 2.14 and 2.87 observed at high signal-to-noise and 6.6 km s −1 resolution with VLT/UVES, we detect 35 Ovi absorption-line systems (comprising over 100 individual Ovi components) lying within 8 000 km s of zqso. W...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2020
ISSN: 1538-4357
DOI: 10.3847/1538-4357/ab7b6f