Results 41 to 50 of about 4,576 (128)

Detection of Intra-day Variability Timescales of Four High Energy Peaked Blazars with XMM-Newton

, 2010
We selected a sample of 24 XMM-Newton light curves (LCs) of four high energy peaked blazars, PKS 0548-322, ON 231, 1ES 1426+428 and PKS 2155-304. These data comprise continuous light curves of 7.67h to 18.97h in length.
Abdo, Abramowicz, Acciari, Acciari, Acciari, Aharonian, Aharonian, Albert, Albert, Albert, Albert, Alok C. Gupta, Barth, Benlloch, Brinkmann, Camenzind, Chadwick, Chadwick, Cortina, Edelson, Espaillat, Falcone, Garilli, Gehrels, Ghisellini, Gopal-Krishna, Gopal-Krishna, Gupta, Haritma Gaur, Hartman, Hofmann, Horan, Kataoka, Krawczynski, Maier, Maier, Malkan, Markowitz, Marscher, Marshall, Marshall, Massaro, Osterman, Paltani, Paul J. Wiita, Pawel Lachowicz, Petry, Piner, Primack, Rani, Roberts, Sakamoto, Sambruna, Schwartz, Shimmins, Stecker, Superina, Tagliaferri, Tashiro, Tommasi, Urry, Urry, Uttley, Wagner, Wiita, Wolter, Zhang, Zhang, Zhang, Zhang   +69 more
core   +1 more source

The Spectral Energy Distribution and Emission-Line properties of the NLS1 Galaxy Arakelian 564

, 2003
We present the intrinsic spectral energy distribution (SED) of the NLS1 Arakelian 564, constructed with contemporaneous data obtained during a multi-wavelength, multi-satellite observing campaign in 2000 and 2001.
B. M. Peterson, Boller Th., Brandt W. N., Brandt W. N., D. M. Crenshaw, de Vaucouleurs G., G. A. Kriss, Grupe D., H. Netzer, I. M. George, K. Horne, Lawrence A., Moorwood A. F. M., O. Shemmer, P. Romano, Pounds K. A., Puchnarewicz E. M., R. W. Pogge, Ross R., S. B. Kraemer, S. Mathur, Shakura N. I., T. J. Turner, W. N. Brandt, W. Wamsteker, Walter R.   +25 more
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Polarization and US foreign policy: key debates and new findings. [PDF]

Int Polit (Hague), 2022
Friedrichs GM, Tama J.
europepmc   +1 more source

A long, hard look at MCG-6-30-15 with XMM-Newton II: detailed EPIC analysis and modelling

, 2003
The bright Seyfert 1 galaxy MCG-6-30-15 has provided some of the best evidence to date for the existence of supermassive black holes in active galactic nuclei.
A. C. Fabian, Arnaud, Ballantyne, Ballantyne, Ballantyne, Ballantyne, Ballet, Behar, Behar, Behar, Bevington, Bianchi, Blackman, Blissett, Blustin, Branduardi-Raymont, Bromley, Cunningham, Dabrowski, Dabrowski, Deeming, den Herder, Dewangan, Dickey, Edelson, Elvis, Fabian, Fabian, Fabian, Fabian, Fabian, Francis, George, Grandi, Guainazzi, Guilbert, Haardt, Holt, Inoue, Inoue, Iwasawa, Iwasawa, Jansen, Kahn, Kaspi, Kinkhabwala, Krolik, Krolik, Laor, Lee, Lee, Lee, Lee, Lee, Lightman, Longinotti, Lubinski, Lumb, Magdziarz, Martocchia, Mason, Matsumoto, Matsuoka, Matt, Matt, Matt, Matt, Matt, Matt, McHardy, McHardy, Merloni, Miller, Miller, Miniutti, Miniutti, Mittaz, Mushotzky, Nahar, Nandra, Nandra, Nandra, Nandra, Nandra, Nandra, Nayakshin, Netzer, Nicastro, Ogle, Otani, Page, Page, Page, Page, Palmeri, Papadakis, Papadakis, Perola, Petrucci, Pietrini, Porquet, Pounds, Pounds, Pounds, Pounds, Pounds, Reeves, Reeves, Reeves, Reynolds, Reynolds, Reynolds, Reynolds, Reynolds, Reynolds, Ross, S. Vaughan, Sako, Sako, Schurch, Shih, Spitzer, Steenbrugge, Stella, Strüder, Tanaka, Taylor, Turner, Turner, Turner, Turner, Uttley, Uttley, Uttley, Vaughan, Vaughan, Vaughan, Vaughan, Verner, Weaver, Whitney, Wilms, Yaqoob, Yaqoob, Yaqoob, Yaqoob, Young, Young, Zdziarski, Zdziarski   +149 more
core   +1 more source

Constraints on the temperature inhomogeneity in quasar accretion discs from the ultraviolet-optical spectral variability

, 2015
The physical mechanisms of the quasar ultraviolet (UV)-optical variability are not well understood despite the long history of observations. Recently, Dexter & Agol presented a model of quasar UV-optical variability, which assumes large local temperature
Kokubo, Mitsuru
core   +1 more source

Determination of the size of the dust torus in H0507+164 through optical and infrared monitoring

, 2018
The time delay between flux variations in different wavelength bands can be used to probe the inner regions of active galactic nuclei (AGN). Here, we present the first measurements of the time delay between optical and near-infrared (NIR) flux variations
Gandhi, Poshak, Hoenig, Sebastian, Kurian, Kshama S., Mandal, Amit Kumar, Mathew, Blesson, Pandge, M. B., Rakshit, Suvendu, Sagar, Ram, Stalin, C. S.   +8 more
core   +1 more source

The narrow-line quasar NAB 0205+024 observed with XMM-Newton

, 2004
The XMM-Newton observation of the narrow-line quasar NAB 0205+024 reveals three striking differences since it was last observed in the X-rays with ASCA. Firstly, the 2-10 keV power-law is notably steeper.
A. C. Fabian, Arnaud, Bahcall, Boller, Boroson, Boroson, Brandt, den Herder, Dickey, Done, Dovčiak, Edelson, Fabian, Fabian, Fiore, Fiore, Galeev, Gallo, Grupe, Guainazzi, Iwasawa, Jansen, Klimek, L. C. Gallo, Laor, Leighly, Leighly, Mason, Merloni, Nicastro, Osterbrock, Reeves, S. Vaughan, Skibo, Strüder, Sulentic, Th. Boller, Turner, Turner, Turner, Vaughan, Vaughan, W. N. Brandt, Yaqoob   +43 more
core   +1 more source

Mass of the black hole in the Seyfert 1.5 galaxy H 0507+164 from reverberation mapping

, 2011
We present the results of our optical monitoring campaign of the X-ray source H 0507+164, a low luminosity Seyfert 1.5 galaxy at a redshift z = 0.018. Spectroscopic observations were carried out during 22 nights in 2007, from the 21 of November to the 26
Coziol, R., Jeyakumar, S., Pawase, R. S., Stalin, C. S., Thakur, S. S.   +4 more
core   +1 more source

Investigating the association between mass transit adoption and COVID-19 infections in US metropolitan areas. [PDF]

Sci Total Environ, 2022
Thomas MM, Mohammadi N, Taylor JE.
europepmc   +1 more source

Apples and Glaciers: Students Spark Interdisciplinary Research Collaborations

, 2019
It is an honor to be here. I want to begin by thanking the library for supporting so many of us in our creative and scholarly work. Quite frankly, it would be impossible for me to do my work without these amazing librarians.
Monani, Salma
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