Results 71 to 80 of about 80,758 (270)

The Response of Warm Absorbers to the Variations in the Ionizing Continuum in the Active Galaxy NGC 4051

The Astrophysical Journal
We present a time-resolved X-ray spectral analysis of the warm absorbers in the Seyfert galaxy NGC 4051, which has an active galactic nucleus (AGN), using observations from the Neutron Star Interior Composition Explorer (NICER).
Dev R. Sadaula, Timothy R. Kallman, Sibasish Laha   +2 more
doaj   +1 more source

‘Mere Amateurs’? Elementary Teachers and the Making of Scientific Authority in the British Child Study Movement

History, EarlyView.
Abstract This article offers new perspectives on the relationship between elementary teaching, scientific expertise and the professionalization of the human sciences. Previous scholarship has demonstrated the ready existence of ‘amateur’ science societies in the nineteenth century where cross‐class exchanges were common.
Julia Gustavsson
wiley   +1 more source

Studies of active galactic nuclei with CTA

, 2012
In this paper, we review the prospects for studies of active galactic nuclei (AGN) using the envisioned future Cherenkov Telescope Array (CTA). This review focuses on jetted AGN, which constitute the vast majority of AGN detected at gamma-ray energies ...
A. Reimer, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Acciari, Ackermann, Ackermann, Aharonian, Aharonian, Aharonian, Aharonian, Albert, Albert, Albert, Aleksic, Aleksic, Araudo, Atoyan, Baring, Barkov, Beall, Bednarek, Bednarek, Bednarek, Blandford, Blandford, Blażejowski, Bloom, Böttcher, Böttcher, Böttcher, Böttcher, Böttcher, Böttcher, Capetti, Cavaliere, Celotti, Chiaberge, Chiaberge, De Angelis, Dermer, Dermer, Dermer, Dermer, Dwek, Eichler, Ellison, Essey, Fanaroff, Finke, Fossati, Franceschini, Georganopoulos, Ghisellini, Ghisellini, Ghisellini, Giannios, Gilmore, Giommi, Kirk, Königl, Landt, Li, M. Böttcher, Mannheim, Maraschi, Marscher, Mücke, Mücke, Mücke, Ostrowski, Padovani, Pian, Pohl, Poutanen, Protheroe, Rau, Rawling, Reimer, Reimer, Reynoso, Romani, Roustazadeh, Roustazadeh, Sikora, Simet, Sitarek, Stawarz, Stecker, Stecker, Takahashi, Urry   +98 more
core   +1 more source

Ecology in Hartmut Rosa's Theory of Resonance: A Four‐Level Reconstruction

Dialog, EarlyView.
ABSTRACT This article discusses Hartmut Rosa's sociological theory of resonance with special emphasis on religion and ecology. In Rosa, resonance experiences refer to (always) participatory and (normally) enlivening world relations. I argue that Rosa's resonance theory is multi‐pronged and covers at least three interconnected levels.
Niels Henrik Gregersen
wiley   +1 more source

The physics of galactic winds driven by active galactic nuclei

, 2012
Active galactic nuclei (AGN) drive fast winds in the interstellar medium of their host galaxies. It is commonly assumed that the high ambient densities and intense radiation fields in galactic nuclei imply short cooling times, thus making the outflows ...
Abbott, Alexander, Baum, Bautista, Beck, Berger, Bland-Hawthorn, Blandford, Blandford, Booth, Braito, Chang, Chartas, Cioffi, Ciotti, Ciotti, Claude-André Faucher-Giguère, Creasey, Dai, DeBuhr, DeBuhr, Di Matteo, Dobler, Downes, Dunn, Durier, Eliot Quataert, Emmering, Falle, Ferrarese, Feruglio, Fischer, France, Fu, Gallimore, Gebhardt, Ghavamian, Gibson, Greene, Greene, Gültekin, Hainline, Hopkins, Hopkins, Hutchings, Kay, King, King, King, King, Konigl, Koo, Koo, Lacki, Lacki, Lacki, Levin, Markevitch, McKee, Mihos, Moe, Murray, Murray, Narayan, Ostriker, Paumard, Pounds, Pounds, Proga, Rees, Riquelme, Risaliti, Rupke, Saitoh, Sanders, Sazonov, Sazonov, Sazonov, Schwartz, Scoville, Sijacki, Silk, Silk, Spitzer, Springel, Sturm, Su, Thompson, Thompson, Tombesi, Treister, Tremaine, Tremonti, Tripp, Turnshek, Ulvestad, Veilleux, Weaver, Weymann, Weymann, Wyithe   +100 more
core   +1 more source

The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei

The Astrophysical Journal
It has previously been found that the galaxy cluster environment can affect the fueling and evolution of active galactic nuclei (AGN). This work examines the effect of the merging cluster environment on the properties of radio AGN by comparing the radio ...
Mary Rickel, Emily Moravec, Yjan A. Gordon, Martin J. Hardcastle, Jonathon C. S. Pierce, Lawrence E. Bilton, Ian D. Roberts   +6 more
doaj   +1 more source

Evolution of Active Galactic Nuclei [PDF]

, 2013
[Abriged] Supermassive black holes (SMBH) lurk in the nuclei of most massive galaxies, perhaps in all of them. The tight observed scaling relations between SMBH masses and structural properties of their host spheroids likely indicate that the processes fostering the growth of both components are physically linked, despite the many orders of magnitude ...
Merloni, A., Heinz, S.
openaire   +3 more sources

Winter‐active spiders (Clubiona) have a hyperactive antifreeze protein with a unique beta‐solenoid fold

The FEBS Journal, EarlyView.
Antifreeze proteins from winter‐active spiders were purified using their affinity for ice. After LC–MSMS characterization, corresponding transcripts were identified. The antifreeze protein folds as a β‐solenoid with a large flat ice‐binding site on one surface and can bind to ice crystals and prevent their growth at −4 °C.
Laurie A. Graham, Stano Pekár, Ina M. Hainer, Peter L. Davies   +3 more
wiley   +1 more source

Active Galactic Nuclei and Transformation of Dark Matter into Visible Matter

, 2009
The hypothesis that dark matter is converted into visible particles in active galactic nuclei is investigated. If dark matter consists of stable superheavy neutral particles and active galactic nuclei are rotating black holes, then, due to the Penrose ...
A. A. Grib, A. A. Grib, A. A. Grib, A. A. Grib, A. A. Grib, A. A. Grib, H. V. Klapdor-Kleingrothaus, J. F. Navarro, K. Greisen, L. H. Ford, M. Gell-Mann, S. Chandrasekhar, The Pierre Auger Collaboration, V. K. Dubrovich, Ya. B. Zel’dovich, Yu. V. Pavlov   +15 more
core   +1 more source

Investigation of the Quasi-periodic Oscillation Phase Lag of RE J1034+396

The Astrophysical Journal
We conduct an in-depth study of the quasi-periodic oscillation (QPO) properties of RE J1034+396 by constructing QPO phase-folded light curves from 10 XMM-Newton observations during 2020–2021.
Wen-Zhong Li, Shu Zhang, Qing-Cang Shui, Yu-Peng Chen, Shuang-Nan Zhang, Hua Feng, Ming-Yu Ge, Lian Tao, Jing-Qiang Peng, Bo-Yan Chen, Ling-Da Kong, Peng-Ju Wang   +11 more
doaj   +1 more source