Results 31 to 40 of about 765,605 (153)

Replies to Critics

, 2022
Philosophy and Phenomenological Research, Volume 105, Issue 3, Page 752-764, November 2022.
Paul Pietroski
wiley   +1 more source

The Quasar Pairs Environment at z ~ 0.5 [PDF]

, 2016
We analyze the environment of a sample of 20 quasar physical pairs at 0 ...
Uslenghi, M. (5267275), Sandrinelli, Angela, Treves, A., Falomo, R. (5202850), Falomo, R., Sandrinelli, Angela (5267278), Scarpa, R., Uslenghi, M., Treves, A. (5263186), Scarpa, R. (5263180)   +9 more
core   +1 more source

Circum-Galactic Medium in the Halo of Quasars

Frontiers in Astronomy and Space Sciences, 2017
The properties of circum-galactic gas in the halo of quasar host galaxies are investigated analyzing Mg II 2800 and C IV 1540 absorption-line systems along the line of sight close to quasars.
Riccardo Ottolina, Renato Falomo, Aldo Treves, Michela Uslenghi, Jari K. Kotilainen, Riccardo Scarpa, Emanuele Paolo Farina   +6 more
doaj   +1 more source

UEG Week 2023 Poster Presentations

, 2023
United European Gastroenterology Journal, Volume 11, Issue S8, Page 535-1498, October 2023.
wiley   +1 more source

Quasars Probing Quasars. X. The Quasar Pair Spectral Database [PDF]

, 2018
The rare close projection of two quasars on the sky provides the opportunity to study the host galaxy environment of a foreground quasar in absorption against the continuum emission of a background quasar.
Michael A. DiPompeo, Bartle, Stephanie, Rubin, Kate H.R., Findlay, Joseph R., Kate H. R. Rubin, Shanks, Tom, Joseph R. Findlay, Joseph F. Hennawi, Tom Shanks, Prochaska, J. Xavier, Lau, Marie Wingyee, Fumagalli, Michele, Stephanie Bartle, Ben Chehade, Adam D. Myers, Myers, Adam D., Hennawi, Joseph F., DiPompeo, Michael A., Michele Fumagalli, Marie Wingyee Lau, J. Xavier Prochaska, Chehade, Ben   +21 more
core   +2 more sources

A Comparative Study of VTEC Estimates Derived From S/X VLBI and VGOS Observations

Space Weather, Volume 23, Issue 12, December 2025.
Abstract The ionosphere, which strongly varies in time and space, is one of the largest error sources for microwave measurements, if not accounted for accurately. Especially for single‐frequency observations, precise ionospheric models are needed to correct for the ionospheric delays. This study explores the utility of Very Long Baseline Interferometry
Arno Rüegg, Grzegorz Kłopotek, Benedikt Soja   +2 more
wiley   +1 more source

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source

Radio line and continuum observations of quasar-galaxy pairs and the origin of low reshift quasar absorption line systems [PDF]

, 1990
There are a number of known quasars for which our line of sight to the high redshift quasar passes within a few Holmberg radii of a low redshift galaxy.
Stocke, J. T., Vangorkom, J. H., Salzer, J., Hauxthausen, E. M., Carilli, C. L.   +4 more
core  

Measurement of the small-scale structure of the intergalactic medium using close quasar pairs [PDF]

, 2017
Using quasar pairs to measure smoothness Space between galaxies is filled with a tenuous gas known as the intergalactic medium (IGM).
Oñorbe, Jose, Lee, Khee-Gan, Jose Oñorbe, Kulkarni, Girish, Walther, Michael, White, Martin, Joseph F. Hennawi, Zarija Lukić, Martin White, Khee-Gan Lee, Girish Kulkarni, Rorai, Alberto, Prochaska, J Xavier, Michael Walther, Alberto Rorai, Hennawi, Joseph F, J. Xavier Prochaska, Lukić, Zarija   +17 more
core   +1 more source

Isolated Neutron Stars as Science Validation for XMM2ATHENA: Ensuring Robust Data for Future X‐Ray Astronomy

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the availability of deep, wide‐area optical surveys now enable us to explore XINSs at fainter x‐ray fluxes and ...
Adriana Mancini Pires, Christian Motch, Axel Schwope, Iris Traulsen, Jean Ballet, Sudip Chakraborty, David Homan, Jan Kurpas, Ada Nebot Gomez‐Moràn, François‐Xavier Pineau, Hugo Tranin, Natalie Webb   +11 more
wiley   +1 more source