منابع مشابه
X - Ray Observations of WISE - Selected AGN
We report on a NuSTAR and XMM-Newton program that has observed a sample of three extremely luminous, heavily obscured WISE-selected AGN at z ∼ 2 in a broad X-ray band (0.1 − 79 keV). The parent sample, selected to be faint or undetected in the WISE 3.4μm (W1) and 4.6μm (W2) bands but bright at 12μm (W3) and 22μm (W4), are extremely rare, with only ∼ 1000 so-called “W1W2-dropouts” across the ext...
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We observed with XMM-Newton 4 objects selected from the Grossan (1992) catalog, with the aim to search for new ‘changing-look’ AGN. The sample includes all the sources which showed in subsequent observations a flux much lower than the one measured with HEAO A-1: NGC 7674, NGC 4968, IRAS 13218+0552 and NGC 1667. None of the sources was caught in a high flux state during the XMM-Newton observatio...
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We present an analysis of four complete samples of radio-loud AGN (3CRR, 2Jy, 6CE and 7CE) using nearand mid-IR data taken by the Wide-Field Infrared Survey Explorer (WISE). The combined sample consists of 79 quasars and 273 radio galaxies, and covers a redshift range 0.003 < z < 3.395. The dichotomy in the mid-IR properties of lowand highexcitation radio galaxies (LERGs HERGs) is analysed for ...
متن کاملThe Overdense Environments of WISE-Selected, Ultra-Luminous, High-Redshift AGN in the Submillimeter
The environments around WISE-selected hot dust obscured galaxies (Hot DOGs) and WISE/radio-selected active galactic nuclei (AGNs) at average redshifts of z = 2.7 and z = 1.7, respectively, were found to have overdensities of companion Submillimeter-selected sources. The overdensities were of∼2–3 and∼5–6 , respectively, compared with blank field submm surveys. The space densities in both samples...
متن کاملWise indifference of the wise in anesthesia.
~!T7T€p KaL TO lcupeVEW Kat T6 vyu.f~ew of! TO Ttj-tvew ~ j-t~ TSj-tV€W ~ cpapj-taKdmv ~ j-t~ cpapj-taKeVm • trJ"Tlv, d.A.A.a T?! woi. J OHN Dewey, "the most profound and understanding thinker on education that the world has yet known" (Ernest C. Moore), has said repeatedly that mankind so far has been ruled by things and by words, not by thought. Humanity has not been in possession of the cond...
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ژورنال
عنوان ژورنال: The Astrophysical Journal Supplement Series
سال: 2018
ISSN: 1538-4365
DOI: 10.3847/1538-4365/aaa00a