Results 61 to 70 of about 24,041 (212)
Quasars Probing Quasars. IX. The Kinematics of the Circumgalactic Medium Surrounding z ∼ 2 Quasars [PDF]
The Astrophysical Journal, 2018 Abstract We examine the kinematics of the gas in the environments of galaxies hosting quasars at z ∼ 2. We employ 148 projected quasar pairs to study the circumgalactic gas of the foreground quasars in absorption. The sample selects foreground quasars with precise redshift measurements, using emission lines with precision ≲300 km s−1 and
Marie Wingyee Lau +2 more
openaire +4 more sources
The Physical Relation between Disc and Coronal Emission in Quasars
Frontiers in Astronomy and Space Sciences, 2018 We propose a modified version of the observed non-linear relation between the X-ray (2 keV) and the ultraviolet (2,500 Å) emission in quasars (i.e., LX∝LUVγ) which involves the full width at half-maximum, FWHM, of the broad emission line, i.e., LX∝LUVγ ...
Elisabeta Lusso +2 more
doaj +1 more source
EIGER. III. JWST/NIRCam Observations of the Ultraluminous High-redshift Quasar J0100+2802
The Astrophysical Journal, 2023 We present the first rest-frame optical spectrum of a high-redshift quasar observed with JWST/NIRCam in Wide Field Slitless mode. The observed quasar, J0100+2802, is the most luminous quasar known at z > 6. We measure the mass of the central supermassive
Anna-Christina Eilers +8 more
doaj +1 more source
Journal of Gastroenterology and Hepatology, EarlyView.ABSTRACT Background and Aim The global QUASAR (NCT04033445) clinical program demonstrated the efficacy and safety of guselkumab, a dual‐acting interleukin‐23 p19 subunit inhibitor, as induction and maintenance therapy in participants with moderate to severely active ulcerative colitis (UC).
Baili Chen +12 more
wiley +1 more source
Some Constraints on Quasar Progenitors and Quasar Evolution [PDF]
Symposium - International Astronomical Union, 1986 There is strong evidence that quasars are powered by the gravitational energy released by in fall of matter into a compact supermassive object which is most likely a black hole with mass M>106 to 109MO. The question then arises as to how such massive black holes came to be formed. What sort of objects were the progenitors?
openaire +2 more sources
A Southern Photometric Quasar Catalog from the Dark Energy Survey Data Release 2
The Astrophysical Journal Supplement Series, 2022 We present a catalog of 1.4 million photometrically selected quasar candidates in the southern hemisphere over the ∼5000 deg ^2 Dark Energy Survey (DES) wide survey area. We combine optical photometry from the DES second data release (DR2) with available
Qian Yang, Yue Shen
doaj +1 more source
Meteoritics &Planetary Science, Volume 60, Issue 3, Page 544-569, March 2025.Abstract Refractory inclusions (RIs) in chondrites are widely used as tracers of early solar system formation conditions. In the context of sample‐return missions, a non‐destructive and non‐invasive analytical tool that can rapidly detect and characterize RIs in space samples during their early phase of study is highly needed.
Jean Charlier +4 more
wiley +1 more source
WITNESSING THE BIRTH OF A QUASAR [PDF]
The Astronomical Journal, 2010 27 pages, 5 figures. Updated references.
Takamitsu Tanaka +2 more
openaire +2 more sources
Quasars in the COSMOS Field [PDF]
The Astrophysical Journal, 2006 Accepted for publication in ApJ; emulateapj style; 25 pages, 13 figures, 4 ...
Prescott, M. K. M. +3 more
openaire +5 more sources
Mathematical Methods in the Applied Sciences, Volume 48, Issue 10, Page 10550-10570, 15 July 2025.ABSTRACT Bacteriophages, or phages (viruses of bacteria), play significant roles in shaping the diversity of bacterial communities within the human gut. A phage‐infected bacterial cell can either immediately undergo lysis (virulent/lytic infection) or enter a stable state within the host as a prophage (lysogeny) until a trigger event, called prophage ...
Hyacinthe M. Ndongmo Teytsa +3 more
wiley +1 more source