Results 21 to 30 of about 112,522 (249)
Quasar: Easy Machine Learning for Biospectroscopy
Cells, 2021 Data volumes collected in many scientific fields have long exceeded the capacity of human comprehension. This is especially true in biomedical research where multiple replicates and techniques are required to conduct reliable studies.
Marko Toplak +3 more
semanticscholar +1 more source
Reports in Advances of Physical Sciences, 2020 It is an unsolved mystery that the rotation velocity of a galactic disc is same at any radial distances. The presence of dark matter is expected, but not observed.
Shigeto Nagao
doaj +1 more source
Composite Quasar Spectra from the Sloan Digital Sky Survey [PDF]
, 2001 We have created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS). The quasar sample spans a redshift range of 0.044 ≤ z ≤ 4.789 and an absolute r' magnitude range of -18.0 to
S. C. D. E. V. Berk, E. al.
semanticscholar +1 more source
REVERBERATION RESPONSES IN LIGHT CURVES OF THE Q2237+0305 QUASAR [PDF]
Radio Physics and Radio Astronomy, 2018 Purpose: Studying the spatial structure of the quasar in the Q2237+0305 gravitational lens system in optical spectral range; estimating the central black hole mass.
L. A. Berdina +2 more
doaj +1 more source
The Astrophysical Journal Letters, 2022 We report the discovery of giant (50−100 kpc) [O ii ] emitting nebulae with MUSE in the field of TXS 0206−048, a luminous quasar at z = 1.13. “Down-the-barrel” UV spectra of the quasar show absorption at velocities coincident with those of the extended ...
Sean D. Johnson +12 more
doaj +1 more source
A Significantly Neutral Intergalactic Medium Around the Luminous z = 7 Quasar J0252–0503 [PDF]
Astrophysical Journal, 2020 Luminous z ≥ 7 quasars provide direct probes of the evolution of supermassive black holes (SMBHs) and the intergalactic medium (IGM) during the epoch of reionization (EoR).
Feige Wang +16 more
semanticscholar +1 more source
The Astronomical Journal, 2023 We present the first results from a new survey for high-redshift ( z ≳ 5) gravitationally lensed quasars and close quasar pairs. We carry out candidate selection based on the colors and shapes of objects in public imaging surveys, then conduct follow-up ...
Minghao Yue +3 more
doaj +1 more source
The Astrophysical Journal Supplement Series, 2023 Since their first discovery, quasars have been essential probes of the distant Universe. However, due to our limited knowledge of its nature, predicting the intrinsic quasar continua has bottlenecked their usage.
Zechang Sun, Yuan-Sen Ting, Zheng Cai
doaj +1 more source
Kiloparsec-scale ALMA Imaging of [C ii] and Dust Continuum Emission of 27 Quasar Host Galaxies at z ∼ 6 [PDF]
Astrophysical Journal, 2020 We present a study of the [C ii] 158 μm line and underlying far-infrared (FIR) continuum emission of 27 quasar host galaxies at z ∼ 6, traced by the Atacama Large Millimeter/submillimeter Array at a spatial resolution of ∼1 physical kpc.
B. Venemans +14 more
semanticscholar +1 more source
Improved redshifts for SDSS quasar spectra [PDF]
, 2010 A systematic investigation of the relationship between different redshift estimation schemes for more than 91000 quasars in the Sloan Digital Sky Survey (SDSS) Data Release 6 (DR6) is presented.
Abazajian +30 more
core +3 more sources