5 papers
Probing Large-scale UV Background Inhomogeneity Associated with Quasars using Metal Absorption
Sean Morrison, Matthew M. Pieri, Debopam Som +1
We study large-scale UV background inhomogeneity in three-dimensions associated with the observed quasar populations at high redshift. We do this by measuring metal absorption thro…
Spectroscopic QUasar Extractor and redshift (z) EstimatorSQUEzE II: Universality of the results
Ignasi Pérez-Ràfols, Matthew M. Pieri
In this paper we study the universality of the results of SQUEzE, a software package to classify quasar spectra and estimate their redshifts. The code is presented in \cite{Perez-R…
Spectroscopic QUasar Extractor and redshift (z) EstimatorSQUEzE I: Methodology
Ignasi Pérez-Ràfols, Matthew M. Pieri, Michael Blomqvist +2
We present SQUEzE, a software package to classify quasar spectra and estimate their redshifts. SQUEzE is a random forest classifier operating on the parameters of candidate emissio…
Origin of Metals around Galaxies I: Catalogs of Metal-line Absorption Doublets from High-Resolution Quasar Spectra
Lluís Mas-Ribas, Signe Riemer-Sørensen, Joseph F. Hennawi +5
We present the first paper of the series Origin of Metals around Galaxies (OMG) aimed to study the origin of the metals observed in the circumgalactic and intergalactic media. In t…
The Cosmological Bias Factor of Damped Lyman Alpha systems: Dependence on Metal Line Strength
Ignasi Pérez-Ràfols, Jordi Miralda-Escudé, Andreu Arinyo-i-Prats +2
We measure the cosmological bias factor of DLAs from their cross-correlation with the Ly forest absorption, as a function of the DLA metal strength, defined from an average of e…