Results 11 to 20 of about 62,829 (219)

A 5-month-old infant with a pineal tumor. [PDF]

Brain Pathol
Brain Pathology, Volume 36, Issue 3, May 2026.
Forest F, Hasselblatt M, Barral-Clavel F, Clemenson A, Thouvenin S, Berger C, Leer AM, Godfraind C.   +7 more
europepmc   +2 more sources

Simultaneous EUVE/ASCA/RXTE Observations of NGC 5548 [PDF]

, 1999
We present simultaneous observations by EUVE, ASCA, and RXTE of the type~1 Seyfert galaxy NGC 5548. These data indicate that variations in the EUV emission (at $\sim 0.2 $keV) appear to lead similar modulations in higher energy ($\ga 1 $keV) X-rays by ...
Belloni T., C. S. Reynolds, Collin-Souffrin S., Courvoisier T. J.-L., Fabian A., G. Madejski, George I. M., Gierlinski M., H. L. Marshall, J. Chiang, Kaastra J. S., M. A. Nowak, Magdziarz P., Marshall F. E., N. Murray, Nandra K., Nandra K., O. M. Blaes, P. Magdziarz, Reynolds C. S., Ross R. R., Turner M. J. L.   +21 more
core   +2 more sources

Not that long time ago in the nearest galaxy: 3D slice of molecular gas revealed by a 110 years old flare of Sgr A* [PDF]

, 2016
A powerful outburst of X-ray radiation from the supermassive black hole Sgr A* at the center of the Milky Way is believed to be responsible for the illumination of molecular clouds in the central ~100 pc of the Galaxy (Sunyaev et al., 1993, Koyama et al.,
Churazov, E., Khabibullin, I., Ponti, G., Sunyaev, R.   +3 more
core   +2 more sources

Dust in active nuclei. I. Evidence for "anomalous" properties [PDF]

, 2000
We present observational evidences that dust in the circumnuclear region of AGNs has different properties than in the Galactic diffuse interstellar medium.
International School for Advanced Studies, Trieste (Italy), La Franca, F., Maiolino, R., Marconi, A., Risaliti, G., Salvati, M., Severgnini, P., Vanzi, L.   +7 more
core   +2 more sources

A Spectroscopic and Photometric Study of Short-Timescale Variability in NGC5548 [PDF]

, 2001
Results of a ground-based optical monitoring campaign on NGC5548 in June 1998 are presented. The broad-band fluxes (U,B,V), and the spectrophotometric optical continuum flux F_lambda(5100 A) monotonically decreased in flux while the broad-band R and I ...
A. Burenkov, A. I. Shapovalova, Alloin, B. Wilkes, Barr, C. F. Bender, C. Lund, C. M. Gaskell, Carini, Chiang, Clavel, Collier, Collins, Crenshaw, D. D. Gutzmer, D. J. Bergmann, Dietrich, Dietrich, Dultzin-Hacyan, Dultzin-Hacyan, Dumont, E. A. Sergeeva, E. S. Klimek, Edelson, Edelson, Edelson, Eracleous, George, George, Ghosh, Halpern, Hubeny, J. P. Huchra, Jang, Kaspi, Kaspi, Korista, Laor, Leighly, Leighly, Lyuty, Lyuty, M. A. Poulsen, M. Dietrich, M. E. Hiller, Maoz, Marshall, Merkulova, N. G. Bochkarev, N. Merkulova, Neckel, Noble, O'Brien, Penston, Peterson, Peterson, Peterson, Peterson, Peterson, Peterson, Peterson, Peterson, Petrucci, Piirola, R. Grove, Reichert, Rodríguez-Pascual, Romanishin, S. G. Sergeev, S. Pebley, Santos-Lleó, Stella, Stirpe, T. E. Bills, V. I. Pronik, V. V. Vlasyuk, van Groningen, Wamsteker, Wandel, Wanders, Warwick, Welsh, Welsh, White, Xanthopoulos, Zheng   +85 more
core   +4 more sources

Echoes of multiple outbursts of Sagittarius A* revealed by Chandra [PDF]

, 2013
The relatively rapid spatial and temporal variability of the X-ray radiation from some molecular clouds near the Galactic center shows that this emission component is due to the reflection of X-rays generated by a source that was luminous in the past ...
Clavel, Maïca, Goldwurm, A., Morris, M. R., Ponti, G., Soldi, S., Terrier, R., Trap, G.   +6 more
core   +5 more sources

Inner Size of a Dust Torus in the Seyfert 1 Galaxy NGC 4151

, 2003
The most intense monitoring observations yet made were carried out on the Seyfert 1 galaxy NGC 4151 in the optical and near-infrared wave-bands. A lag from the optical light curve to the near-infrared light curve was measured.
Antonucci R., Baribaud T., Bruce A. Peterson, Clavel J., Glass I. S., Hiroyuki Tomita, Keigo Enya, Kotilainen J. K., Masahiro Suganuma, Oknyanskij V. L., Oknyanskij V. L., Oknyanskij V. L., Takeo Minezaki, Tsutomu Aoki, Ulrich M.-H., Winkler H., Winkler H., Yoshii Y., Yukiyasu Kobayashi, Yuzuru Yoshii   +19 more
core   +1 more source

Anthropogenic nitrogen addition interrupts seasonal connectivity and structures of plant–pollinator networks

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecological communities are stressed by rapid and complex anthropogenic changes, threatening the persistence of biotic interactions and ecosystem functioning. Plant–pollinator communities, for instance, undergo structural transformations as a result of land‐use change ...
Erliang Gao, Huanghuang Yu, Ting Yang, Yuxian Wang, Cheng Bi, Pengfei Zhang, Amparo Lázaro, Christopher N. Kaiser‐Bunbury, Zhigang Zhao   +8 more
wiley   +1 more source

Global meta‐analysis reveals urban‐associated behavioural differences among wild populations

Journal of Animal Ecology, EarlyView.
Urbanization drives rapid phenotypic change, yet broad patterns of behavioural responses remain unclear. Using a global phylogenetic meta‐analysis, we show urban populations exhibit increased boldness, aggression, exploration and activity—especially in birds—highlighting consistent behavioural shifts and revealing major taxonomic gaps that limit our ...
Tracy T. Burkhard, Ned A. Dochtermann, Anne Charmantier   +2 more
wiley   +1 more source

Keplerian Motion of Broad-Line Region Gas as Evidence for Supermassive Black Holes in Active Galactic Nuclei [PDF]

, 1999
Emission-line variability data on NGC 5548 argue strongly for the existence of a mass of order 7 x 10^7 solar masses within the inner few light days of the nucleus in the Seyfert 1 galaxy NGC 5548.
Amri Wandel, Bradley M. Peterson, Kormendy J., Richstone D., Wilkes B. J.   +4 more
core   +4 more sources