Results 1 to 10 of about 117,210 (326)

ISO Observations of Quasars and Quasar Hosts [PDF]

open access: yes, 1997
The Infrared Space Observatory (ISO), launched in November 1995, allows us to measure the far-infrared (far-IR) emission of quasars in greater detail and over a wider energy range than previously possible. In this paper, preliminary results in a study of the 5--200 $ m$ continuum of quasars and active galaxies are presented. Comparison of the spectral
openaire   +3 more sources

The Infrared Traced Star Formation Rates of Associated Absorption Lines Quasars

open access: yesThe Astrophysical Journal
Some optically selected quasars exhibit Mg ii- associated absorption lines (AALs), and their origin remains unclear. In this paper, we compile a sample of 1769 quasars, with or without Mg ii AALs, of which 1689 are far-infrared (FIR) detected quasars and
Zhe-Geng Chen   +6 more
doaj   +1 more source

Exploiting the IRT-THESEUS Capability to Observe Lensed Quasars

open access: yesGalaxies, 2021
THESEUS is an ESA space based project, which aims to explore the early universe by unveiling a complete census of Gamma-ray Burst (GRB) population in the first billion years.
Lindita Hamolli   +3 more
doaj   +1 more source

Evaluation of the system accuracy of frameless stereotactic radiosurgery using a combination of cone beam CT, six degrees of freedom couch, and surface image‐guided systems

open access: yesJournal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study aims to evaluate the accuracy of the frameless linear accelerator‐based stereotactic radiosurgery (FSRS) system incorporating cone‐beam CT (CBCT), six degrees of freedom (6‐DoF) couch, room laser, and surface image‐guided (SG) systems.
Hao‐Wen Cheng   +4 more
wiley   +1 more source

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XXI. Candidate Red Quasars at z ≥ 6 from Near-infrared Photometry

open access: yesThe Astrophysical Journal
We present an analysis of near-infrared photometry of 59 quasars at 5.83  −24 mag) of the sample. This luminosity trend may support the idea that red quasars represent an evolutionary stage preceding unobscured quasars, often invoked in the merger-driven
Ryo Iwamoto   +10 more
doaj   +1 more source

Dust-Deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission

open access: yes, 2017
To elucidate the intrinsic broadband infrared (IR) emission properties of active galactic nuclei (AGNs), we analyze the spectral energy distributions (SEDs) of 87 ...
Lyu, Jianwei, Rieke, G. H., Shi, Yong
core   +1 more source

Characterization and Optimization of Vesicle Properties in bioPISA: from Size Distribution to Post‐Assembly Loading

open access: yesAdvanced Biology, EarlyView.
The paper explores the creation and characterization of vesicles through biocatalytic Polymerization‐Induced Self‐Assembly (bioPISA), focusing on achieving size uniformity using centrifugation techniques. It examines the effects of stirring speed on vesicle morphology and analyses the internal polymer‐rich structure using fluorescence correlation ...
Andrea Belluati   +7 more
wiley   +1 more source

Exploring Reionization-era Quasars. IV. Discovery of Six New z ≳ 6.5 Quasars with DES, VHS, and unWISE Photometry [PDF]

open access: yesAstronomical Journal, 2018
This is the fourth paper in a series of publications aiming at discovering quasars at the epoch of reionization. In this paper, we expand our search for z ∼ 7 quasars to the footprint of the Dark Energy Survey (DES) Data Release One (DR1), covering ∼5000
Jinyi Yang   +9 more
semanticscholar   +1 more source

The Study of the Circumgalactic Medium with Quasar Pairs

open access: yesThe Astrophysical Journal Supplement Series, 2023
We have collected 10,025 foreground–background quasar pairs with projected distances d _p < 500 kpc from the large quasar catalog of the Sloan Digital Sky Survey DR16Q. We investigate the properties of the Mg ii absorption lines with W _r > 0.15 Å around
Zhi-Fu Chen   +7 more
doaj   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

open access: yesAdvanced Photonics Research, EarlyView.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan   +5 more
wiley   +1 more source

Home - About - Disclaimer - Privacy