Systematically smaller single-epoch quasar black hole masses using a radius–luminosity relationship corrected for spectral bias [PDF]
, 2022 Jaya Maithil +8 more
openalex +1 more source
A Hubble Diagram for Quasars [PDF]
Frontiers in Astronomy and Space Sciences, 2018 The cosmological model is at present not tested between the redshift of the farthest observed supernovae (z ~ 1.4) and that of the Cosmic Microwave Background (z ~ 1,100). Here we introduce a new method to measure the cosmological parameters: we show that quasars can be used as "standard candles" by employing the non-linear relation between their ...
Susanna Bisogni +4 more
openaire +5 more sources
Comparative evaluation of volume and helical four‐dimensional computed tomography using canon system
Journal of Applied Clinical Medical Physics, Volume 26, Issue 11, November 2025.Abstract Background Four‐dimensional computed tomography (4DCT) is an advanced imaging technique designed to capture anatomical motion over time, enabling more accurate evaluation of tumor and organ motion owing to respiration, while minimizing motion‐related artifacts.
Changhwan Kim +9 more
wiley +1 more source
Quasars in the 2MASS Second Incremental Data Release
, 2001 Using the 2MASS Second Incremental Data Release, we have searched for near infrared counterparts to 13214 quasars from the Veron-Cetty & Veron(2000) catalog.
Baker J. +6 more
core +3 more sources
A new physical interpretation of optical and infrared variability in quasars [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Changing-look quasars are a recently identified class of active galaxies in which the strong UV continuum and/or broad optical hydrogen emission lines associated with unobscured quasars either appear or disappear on time-scales of months to years.
N. Ross +13 more
semanticscholar +1 more source
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 +2 more sources
Hypothalamic Astrocytes Exhibit Glycolytic Features Making Them Prone for Glucose Sensing
Glia, Volume 73, Issue 11, Page 2253-2272, November 2025.Main Points Hypothalamic astrocytes versus cortical astrocytes: are more glycolytic due to high Pkm2, Glut1 and Mct4 expression do not exhibit glutamate‐induced glycolysis detect glucose concentration variations via an AMPK sensor with altered lactate production.
Sarah Geller +11 more
wiley +1 more source
The Astrophysical Journal, 2023 We present bolometric luminosity ( L _bol ) and black hole (BH) mass ( M _BH ) estimators based on mid-infrared (MIR) continuum luminosity (hereafter, L _MIR ) that are measured from infrared (IR) photometric data.
Dohyeong Kim +6 more
doaj +1 more source
A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates [PDF]
, 2016 Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circum-binary discs predict strong periodic modulation of the mass accretion ...
M. Charisi +7 more
semanticscholar +1 more source
Dust Emission in an Accretion-rate-limited Sample of z ≳ 6 Quasars [PDF]
Astrophysical Journal, 2018 We present Atacama Large Millimeter Array 1 mm observations of the rest-frame far-infrared (FIR) dust continuum in 27 quasars at redshifts 6.0 ≲ z < 6.7.
B. Venemans +11 more
semanticscholar +1 more source