Results 51 to 60 of about 37,389 (216)

NGC 4151 - A unified active galactic nucleus

, 1996
We present a unified picture of active galactic nuclei which we construct from a detailed model of line emission in the active source in NGC 4151. In this scheme NGC 4151 can be regarded as a typical active nucleus, special only in its orientation. This alleviates a number of problems with a unified picture based on a dusty molecular torus with a fixed
Cassidy, I, Raine, D. J.
openaire   +2 more sources

Seedless One‐Pot Synthesis of Colloidal InAs Quantum Dots Enabling a High‐Accuracy Photoplethysmography Oximeter

Advanced Science, EarlyView.
A real‐time, non‐contact photoplethysmography (PPG) system based on InAs colloidal quantum dots (CQDs) synthesized via a seedless injection synthesis is demonstrated. The measured oxygen saturation shows considerable agreement with commercial PPG devices.
Beom Kwan Kim, Seungin Jee, Yongnam Ahn, In Suh Lee, Dongeon Kim, Seongchong Park, Yujin Jung, In‐Ho Bae, Se‐Woong Baek   +8 more
wiley   +1 more source

Chandra Discovery of a Binary Active Galactic Nucleus in Mrk 739

, 2011
We have discovered a binary AGN in the galaxy Mrk 739 using Chandra and Swift BAT. We find two luminous L_2-10 keV=1.1*10^43 and 1.0*10^42 erg/s, unresolved nuclei with a projected separation of 3.4 kpc (5.8\pm0.1) coincident with two bulge components in
Fischer, Greve, Ho, Kennicutt, Komossa, Koss, Netzer, Noguchi, Peng, Schawinski, Smith, Steffen, Veilleux, Vestergaard, Volonteri, Winter, Yun   +16 more
core   +1 more source

Biomimetic Polymerization of Tellurocysteine: Breaking the Natural Amino Acid Radioprotection Limitation

Advanced Science, EarlyView.
Inspired by natural amino acid polymer‐melanin systems, this study strategically incorporated tellurocysteine to develop advanced radiation‐shielding materials. This approach transformed the primary interaction mechanism between melanin‐based materials and incident photons from Compton scattering to the photoelectric effect. Tellurocysteine‐polymerized
Wei Chen, Hanjie Zhu, Yue Zhang, Yuqing Qiao, Ruotong Deng, Huaping Xu, Wei Cao   +6 more
wiley   +1 more source

A First Close Look at the Balmer-edge Behavior of the Quasar Big Blue Bump [PDF]

, 2002
We have found for the first time a Balmer edge feature in the Big Blue Bump emission of a quasar. The feature is seen in the polarized flux spectrum of the quasar, where all the emissions from outside the nucleus are scraped off and removed.
Agol, Agol, Antonucci, Antonucci, Antonucci, Antonucci, Antonucci, Antonucci, Antonucci, Berriman, Blaes, Brown, Cardelli, Chandrasekar, Coleman, Czerny, Francis, Gnedin, Goodrich, Hubeny, Hubeny, Koratkar, Koratkar, Koratkar, Kriss, Lanzetta, Laor, Makoto Kishimoto, Miller, Neugebauer, Oke, Omer Blaes, Robert Antonucci, Sanders, Schmidt, Schmidt, Smith, Stockman, Wills, Young, Zheng   +40 more
core   +3 more sources

Deep Learning‐Assisted Coherent Raman Scattering Microscopy

Advanced Intelligent Discovery, EarlyView.
The analytical capabilities of coherent Raman scattering microscopy are augmented through deep learning integration. This synergistic paradigm improves fundamental performance via denoising, deconvolution, and hyperspectral unmixing. Concurrently, it enhances downstream image analysis including subcellular localization, virtual staining, and clinical ...
Jianlin Liu, Rujia Liu, Xinyan Zhang, Xun Chen, Shuhua Yue   +4 more
wiley   +1 more source

Prior-informed Active Galactic Nucleus Host Spectral Decomposition Using PyQSOFit

The Astrophysical Journal
We introduce an improved method for decomposing the emission of active galactic nuclei (AGN) and their host galaxies using templates from principal component analysis (PCA).
Wenke Ren, Hengxiao Guo, Yue Shen, John D. Silverman, Colin J. Burke, Shu Wang, Junxian Wang   +6 more
doaj   +1 more source

Modeling the Spectral Energy Distribution of the Active Galactic Nucleus inside NGC 4395

The Astrophysical Journal, 2023
We study the broadband spectral energy distribution (SED) of the prototypical low-mass active galactic nucleus (AGN) in NGC 4395. We jointly model the optical through mid-IR SED with a combination of galaxy and AGN light, and find that on arcsecond ...
Hector Afonso G. Cruz, Andy D. Goulding, Jenny E. Greene   +2 more
doaj   +1 more source

Observational limits on type 1 active galactic nucleus rate in COSMOS [PDF]

, 2009
We present black hole masses and accretion rates for 182 Type 1 active galactic nuclei (AGNs) in COSMOS. We estimate masses using the scaling relations for the broad H β, Mg ii, and C iv emission lines in the redshift ranges 0.16 < z < 0.88, 1 < z < 2 ...
Bongiorno, Angela, Brusa, Marcella, Cappelluti, Nico, Elvis, Martin, Gabor, Jared, Hao, Heng, Huchra, John P., Impey, Chris D., Kelly, Brandon C., Koekemoer, A., McCarthy, Patrick J., Merloni, Andrea, Nagao, Tohru, Salvato, Mara, Scoville, Nick Z., Trump, Jonathan R.   +15 more
core  

WFPC2 Observations of Compact Star Cluster Nuclei in Low Luminosity Spiral Galaxies [PDF]

, 1999
We have used the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope to image the compact star cluster nuclei of the nearby, late-type, low-luminosity spiral galaxies NGC 4395, NGC 4242, and ESO 359-029.
Alan M. Watson, Artyukh V. S., Binggeli B., Bothun G. D., Bothun G. D., Bouyoucef K., Capuzzo-Dolcetta R., Christopher J. Burrows, Colin J., David Crisp, de Vaucouleurs G., Diaz A. I., Firmani C., Ford H. C., Friedli D., Gilda E. Ballester, Hasan H., Heckman T. M., J. Jeff Hester, James A. Westphal, Jeremy R. Mould, John E. Krist, John G. Hoessel, John S. Gallagher III, John T. Clarke, John T. Trauger, Jon A. Holtzman, Karl R. Stapelfeldt, Lynn D. Matthews, Lyutyi V. M., Marquardt J., Matthews L. D., Merritt D., Michard R., Nieto J.-L., Nieto J.-L., Paul A. Scowen, Perry J. J., Pismis P., Regan M. W., Reynolds J. H., Richard E. Griffiths, Robin W. Evans, Sams B. J., III., Sarajedini V. L., Schmidt A. A., Sharov A. S., Silk J., Sofue Y., Terlevich R., Tutukov A. V., van den Bergh S., van der Kruit P. C., Wildey R. L., Williams R. J. R.   +54 more
core   +2 more sources