Quantitative susceptibility mapping (QSM) with an extended physical model for MRI frequency contrast in the brain: a proof‐of‐concept of quantitative susceptibility and residual (QUASAR) mapping
Sign Up to like & getrecommendations! Published in 2018 at "NMR in Biomedicine"
DOI: 10.1002/nbm.3999
Abstract: Quantitative susceptibility mapping (QSM) aims to calculate the tissue's magnetic susceptibility distribution from its perturbing effect on the MRI static main magnetic field. The method is increasingly being applied to study iron and myelin in… read more here.
Keywords: susceptibility; frequency; quasar; model ... See more keywords
Physical association and periodicity in quasar families with SDSS and 2MRS
Sign Up to like & getrecommendations! Published in 2018 at "Astrophysics and Space Science"
DOI: 10.1007/s10509-018-3355-5
Abstract: We have used the Sloan Digital Sky Survey (SDSS) data release 7 (DR7) and the 2MASS (Two Micron All Sky Survey) Redshift Survey (2MRS) Ks≤11.75mag$K_{s} \le11.75~\mbox{mag}$ data release to test for physical association of candidate… read more here.
Keywords: physical association; quasar; survey; periodicity quasar ... See more keywords
XMM–Newton observations of the extremely X-ray luminous quasar CFHQS J142952+544717=SRGE J142952.1 + 544716 at redshift z = 6.18
Sign Up to like & getrecommendations! Published in 2021 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab773
Abstract: We present results from a 20 ks XMM-Newton DDT observation of the radio-load quasar CFHQS J142952+544717 at z=6.18, whose extreme X-ray luminosity was recently revealed by the SRG/eROSITA telescope in the course of its first… read more here.
Keywords: quasar; xmm newton; cfhqs j142952; j142952 ... See more keywords
A framework to measure the properties of intergalactic metal systems with two-point flux statistics
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1363
Abstract: The abundance, temperature, and clustering of metals in the intergalactic medium are important parameters for understanding their cosmic evolution and quantifying their impact on cosmological analysis with the Ly α forest. The properties of these… read more here.
Keywords: measure properties; abundance; two point; quasar ... See more keywords
Further evidence for a quasar-driven jet impacting its neighbour galaxy: the saga of HE0450−2958 continues
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx089
Abstract: HE0450-2958, an interacting quasar-starburst galaxy pair at z = 0.285, is one of the best known examples of strong star formation activity in the presence of a quasardriven jet. We present new multi-band JVLA-imaging covering… read more here.
Keywords: galaxy; jet; quasar; star formation ... See more keywords
Quenching star formation with quasar outflows launched by trapped IR radiation
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty1514
Abstract: We present cosmological radiation-hydrodynamic simulations, performed with the code Ramses-RT, of radiatively-driven outflows in a massive quasar host halo at $z = 6$. Our simulations include both single- and multi-scattered radiation pressure on dust from… read more here.
Keywords: quasar; gas; star formation; radiation pressure ... See more keywords
The infrared-luminous progenitors of high-zquasars
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty3205
Abstract: Here we explore the infrared (IR) properties of the progenitors of high-z quasar host galaxies. Adopting the cosmological, data constrained semi-analytic model GAMETE/QSOdust, we simulate several independent merger histories of a luminous quasar at z… read more here.
Keywords: progenitors high; luminous progenitors; quasar; infrared luminous ... See more keywords
Efficient selection of quasar candidates based on optical and infrared photometric data using machine learning
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz680
Abstract: We aim to select quasar candidates based on the two large survey databases, Pan-STARRS and AllWISE. Exploring the distribution of quasars and stars in the colour spaces, we find that the combination of infrared and… read more here.
Keywords: quasar candidates; optical infrared; machine learning; quasar ... See more keywords
A ghostly damped Ly$α$ system revealed by metal absorption lines
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnrasl/slw233
Abstract: We report the discovery of the first 'ghostly' damped Ly$\alpha$ absorption system (DLA), which is identified by the presence of absorption from strong low-ion species at $z_{\rm abs}=1.70465$ along the line of sight to the… read more here.
Keywords: absorption; ghostly damped; quasar; damped system ... See more keywords
Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs
Sign Up to like & getrecommendations! Published in 2022 at "Science Advances"
DOI: 10.1126/sciadv.abk3291
Abstract: Quasar outflows may play a crucial role in regulating the host galaxy, although the spatial scale of quasar outflows remain a major enigma, with their acceleration mechanism poorly understood. The kinematic information of outflow is… read more here.
Keywords: outflows accelerated; evidence quasar; evidence; fast outflows ... See more keywords