Results 31 to 40 of about 10,836 (194)

The spin temperature of high-redshift damped Lyman-$\alpha$ systems [PDF]

, 2013
We report results from a programme aimed at investigating the temperature of neutral gas in high-redshift damped Lyman-$\alpha$ absorbers (DLAs). This involved (1) HI 21cm absorption studies of a large DLA sample, (2) VLBI studies to measure the low ...
Briggs, F. H., Chengalur, J. N., de Bruyn, A. G., Delafosse, T., Ellison, S. L., Grave, J., Jacobsen, D., Kanekar, N., Lane, W. M., Momjian, E., Prochaska, J. X., Ryan-Weber, E. V., Smette, A.   +12 more
core   +2 more sources

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

Acceleration of C iv and Si iv Broad Absorption Lines in Quasar SDSS J140058.79+260619.4

The Astronomical Journal
We report the discovery of a velocity shift signature in the C iv and Si iv broad absorption lines (BALs) of the quasar SDSS J140058.79+260619.4 ( z _em  = 2.351). From its two-epoch spectra, we find two BAL systems (systems A and B) in C iv and/or Si iv
Ying-Ru Lin, Wei-Jian Lu
doaj   +1 more source

Eddington-limited accretion and the black hole mass function at redshift 6

, 2010
We present discovery observations of a quasar in the Canada-France High-z Quasar Survey (CFHQS) at redshift z=6.44. We also use near-IR spectroscopy of nine CFHQS quasars at z~6 to determine black hole masses.
Alain Omont, Alexander, Antonucci, Bentz, Borys, Bouwens, Carilli, Cen, Chris J. Willott, Céline Reylé, David Crampton, David Schade, Denney, Di Matteo, Diamond-Stanic, Doris Arzoumanian, Fan, Fan, Fan, Ferrarese, Fine, Gebhardt, Granato, Gultekin, Haring, Hopkins, Hopkins, Hopkins, Hopkins, Jacqueline Bergeron, Jiang, Jiang, Jiang, Jiang, John B. Hutchings, Kaspi, Kawakatu, Kollmeier, Komatsu, Kurk, Kurk, Lamastra, Lauer, Lawrence, Li, Loic Albert, Magorrian, Marconi, Mathur, Merloni, Netzer, Ouchi, Peng, Peterson, Philippe Delorme, Press, Reddy, Richards, Riechers, Robertson, Scheuer, Shankar, Shankar, Shankar, Shapiro, Shen, Shen, Silk, Small, Stark, Steidel, Steinhardt, Tundo, Ueda, Vestergaard, Vestergaard, Volonteri, Volonteri, Walter, Wandel, Wang, Wang, Willott, Willott, Willott, Willott, Willott, Woo, Yoo, Yu   +89 more
core   +4 more sources

Mid-Infrared Selected Quasars I: Virial Black Hole Mass and Eddington Ratios [PDF]

, 2014
We provide a catalog of 391 mid-infrared-selected (MIR, 24$\mu$m) broad-emission-line (BEL, type 1) quasars in the 22 deg$^2$ SWIRE Lockman Hole field. This quasar sample is selected in the MIR from Spitzer MIPS with $S_{\rm 24} > 400\mu$Jy, jointly with
Bergeron, Jacqueline, Dai, Y. Sophia, Elvis, Martin, Fazio, Giovanni G., Huang, Jia-Sheng, Omont, Alain, Papovich, Casey, Wilkes, Belinda J., Willmer, Christopher N. A.   +8 more
core   +6 more sources

Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei

Astronomische Nachrichten, EarlyView.
ABSTRACT Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre‐existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources.
Patrik Milán Veres
wiley   +1 more source

Simultaneous Existence of the Line-locking and Velocity Shift Signatures in Quasar SDSS J004613.54+010425.7

The Astrophysical Journal
This study presents a detailed investigation of the broad absorption line (BAL) systems in the quasar SDSS J004613.54+010425.7 (hereafter J0046+0104), which makes characters of the simultaneous existence of line-locking and velocity shift signatures ...
Wei-Jian Lu, Ying-Ru Lin
doaj   +1 more source

Discovery of Hydrogen Radio Recombination Lines at z = 0.89 toward PKS 1830-211

The Astrophysical Journal, 2023
We report the detection of stimulated hydrogen radio recombination line (RRL) emission from ionized gas in a z = 0.89 galaxy using 580–1670 MHz observations from the MeerKAT Absorption Line Survey.
Kimberly L. Emig, Neeraj Gupta, Pedro Salas, Sébastien Muller, Sergei A. Balashev, Françoise Combes, Emmanuel Momjian, Yiqing Song, Preshanth Jagannathan, Partha P. Deka, Gyula I. G. Józsa, Hans-Rainer Klöckner, Abhisek Mohapatra, Pasquier Noterdaeme, Patrick Petitjean, Raghunathan Srianand, Jonah D. Wagenveld   +16 more
doaj   +1 more source

cDC1 Subtype‐Specific In Vivo Targeting of Liposomes

Advanced Science, Volume 13, Issue 19, 2 April 2026.
Dendritic cells, particularly the cDC1 subtype, offer a promising target for drug delivery via liposomes due to their pivotal role in immune regulation, allowing for amplified therapeutic responses. Herein, we show an integration of physicochemical characterization and cell experiments to achieve effective in vivo cDC1 targeting through anti‐CLEC9A ...
Maximilian Schaaf, Michael Fichter, Lin Jian, Felicia Schön, Carina Jung, Paul Schneider, Kai Speth, Ana Mateos‐Maroto, Volker Mailänder, Kaloian Koynov, Svenja Morsbach, Katharina Landfester   +11 more
wiley   +1 more source

Coordinated Velocity Shift of Multiple C iv and Si iv Broad Absorption Lines in Quasar SDSS J113048.45+225206.6

The Astrophysical Journal
We present an analysis of the coordinated velocity shifts observed in multiple C iv and Si iv broad absorption lines (BALs) in the quasar SDSS J113048.45+225206.6.
Wei-Jian Lu, Ying-Ru Lin
doaj   +1 more source