Results 91 to 100 of about 18,958 (240)

Stability of the protogalactic clouds - I: Field length in the adiabatic models [PDF]

Serbian Astronomical Journal, 1999
All gasdynamical models for the evolution of gaseous content of galaxies assume that cooling from the hot, virialized phase to the cold phase occurred through some sort of thermal instability.
Ćirković M.M.
doaj   +1 more source

Absorption Lines in QSOs [PDF]

Symposium - International Astronomical Union, 1987
A comparison between three types of intervening absorption line systems: the Lyα forest, the Lyα damped systems and the narrow metal line systems has been done for the observational properties including the frequency of the systems, the equivalent width distribution, the two point correlation function, the metal abundances, and the dN/dz vs. z behavior.
openaire   +2 more sources

A survey of the state‐of‐the‐art approaches for evaluating trust in software ecosystems

Journal of Software: Evolution and Process, Volume 36, Issue 10, October 2024.
In this article, we explore current approaches used to evaluate trust in software ecosystems, focusing on analyzing the specific techniques utilized, the primary factors in trust evaluation, the diverse formats for result presentation, as well as the software ecosystem entities considered in the approaches. Abstract Third‐party software has streamlined
Fang Hou, Slinger Jansen
wiley   +1 more source

Canopy temperatures strongly overestimate leaf thermal safety margins of tropical trees

New Phytologist, Volume 243, Issue 6, Page 2115-2129, September 2024.
Summary Current estimates of temperature effects on plants mostly rely on air temperature, although it can significantly deviate from leaf temperature (Tleaf). To address this, some studies have used canopy temperature (Tcan). However, Tcan fails to capture the fine‐scale variation in Tleaf among leaves and species in diverse canopies. We used infrared
Olivier Jean Leonce Manzi, Maria Wittemann, Mirindi Eric Dusenge, Jacques Habimana, Aloysie Manishimwe, Myriam Mujawamariya, Bonaventure Ntirugulirwa, Etienne Zibera, Lasse Tarvainen, Donat Nsabimana, Göran Wallin, Johan Uddling   +11 more
wiley   +1 more source

Star Formation in QSO Host Galaxies

, 2006
Many of the conditions that are necessary for starbursts appear to be important in the triggering of QSOs. However, it is still debatable whether starbursts are ubiquitously present in galaxies harboring QSOs.
Alan Stockton, Bahcall, Bergvall, Brotherton, Brotherton, Brotherton, Canalizo, Canalizo, Canalizo, Disney, Dunlop, Floyd, Francis, Gabriela Canalizo, Glikman, Gregg, Hall, Jahnke, Kauffmann, Lacy, Marble, Mark Lacy, Michael S. Brotherton, Sanchez, Sanders, Sanders, Sanders, Sansom, Schweizer, Yu, Zabludoff   +30 more
core   +2 more sources

A QSO survey via optical variability and zero proper motion in the M92 field. IV. More QSOs due to improved photometry

, 2002
We continue the QSO search in the 10 square degrees Schmidt field around M92 based on variability and proper motion (VPM) constraints. We have re-reduced 162 digitised B plates with a time-baseline of more than three decades and have considerably ...
Becker, Bertin, Boyle, Brunzendorf, Conti, Cristiani, Croom, Dahlem, Goldschmidt, Gregg, H. Meusinger, Hartwick, Hasinger, Hewett, Hook, J. Brunzendorf, Kim, La Franca, Maiolino, Menou, Meusinger, Meusinger, Risaliti, Scholz, Sharp, Voit, Véron-Cetty, Webster, White, Wisotzki, Wisotzki   +30 more
core   +1 more source

The Circumgalactic Medium of Submillimeter Galaxies. II. Unobscured QSOs within Dusty Starbursts and QSO Sightlines with Impact Parameters below 100 Kiloparsec [PDF]

, 2017
We present Atacama Large Millimeter/submillimeter Array (ALMA) 870um observations of 29 bright Herschel sources near high-redshift QSOs. The observations confirm that 20 of the Herschel sources are submillimeter-bright galaxies (SMGs) and identify 16 new
Casey, Caitlin M., Cooray, Asantha, Fu, Hai, Isbell, Jacob, Prochaska, J. Xavier, Scoville, Nick, Stockton, Alan   +6 more
core   +2 more sources

Cosmic Chronometers, Pantheon+ Supernovae, and Quasars Favor Coasting Cosmologies over the Flat ΛCDM Model

The Astrophysical Journal
We test and compare coasting cosmological models with curvature parameters $k=\left\{-1,0,+1\right\}$ in ${H}_{0}^{2}{c}^{-2}$ units and the flat ΛCDM model by fitting them to cosmic chronometers (CCs), the Pantheon+ sample of Type Ia supernovae (SNe ...
Peter Raffai, Adrienn Pataki, Rebeka L. Böttger, Alexandra Karsai, Gergely Dálya   +4 more
doaj   +1 more source

Probing Ultralate Reionization: Direct Measurements of the Mean Free Path over 5 < z < 6

The Astrophysical Journal, 2023
The mean free path of ionizing photons, λ _mfp , is a critical parameter for modeling the intergalactic medium (IGM) both during and after reionization.
Yongda Zhu, George D. Becker, Holly M. Christenson, Anson D’Aloisio, Sarah E. I. Bosman, Tom Bakx, Valentina D’Odorico, Manuela Bischetti, Christopher Cain, Frederick B. Davies, Rebecca L. Davies, Anna-Christina Eilers, Xiaohui Fan, Prakash Gaikwad, Martin G. Haehnelt, Laura C. Keating, Girish Kulkarni, Samuel Lai, Hai-Xia Ma, Andrei Mesinger, Yuxiang Qin, Sindhu Satyavolu, Tsutomu T. Takeuchi, Hideki Umehata, Jinyi Yang   +24 more
doaj   +1 more source

A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs? [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
It is thought that a class of broad absorption line (BAL) QSOs, characterised by Fe absorption features in their UV spectra (called `FeLoBALs'), could mark a transition stage between the end of an obscured starburst event and a youthful QSO beginning to shed its dust cocoon, where Fe has been injected into the interstellar medium by the starburst.
Kristen Coppin, Giulio Violino, Jamie Stevens, Ryan C. Hickox, D. M. Alexander, Julie Wardlow, Julie Wardlow, Duncan Farrah, Daniel J. Smith, James E. Geach   +9 more
openaire   +5 more sources