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Assef, R. J.,Stern, D.,Noirot, G.,Jun, H. D.,Cutri, R. M.,Eisenhardt, P. R. M. American Astronomical Society 2018 The Astrophysical journal, Supplement series Vol.234 No.2
<P>We present two large catalogs of active galactic nucleus (AGN) candidates identified across 30,093 deg(2) of extragalactic sky from the Wide-field Infrared Survey Explorer's AllWISE Data Release. Both catalogs are selected purely using the Wide-field Infrared Survey Explorer (WISE) W1 and W2 bands. The R90 catalog consists of 4,543,530 AGN candidates with 90% reliability, while the C75 catalog consists of 20,907,127 AGN candidates with 75% completeness. These reliability and completeness figures were determined from a detailed analysis of UV- to near-IR spectral energy distributions of similar to 10(5) sources in the 9 deg(2) Bootes field. The AGN selection criteria are based on those of Assef et al. (2013) recalibrated to the AllWISE data release. We provide a detailed discussion of potential artifacts and excise portions of the sky close to the Galactic Center, Galactic Plane, nearby galaxies, and other expected contaminating sources. These catalogs are expected to enable a broad range of science, and we present a few illustrative cases. From the R90 sample, we identify 45 highly variable AGNs lacking radio counterparts in the FIRST survey. One of these sources, WISEA J142846.71+172353.1, is a changing-look quasar at z = 0.104, which has changed from having broad Ha to being a narrow-lined AGN. We characterize our catalogs by comparing them to large, wide-area AGN catalogs in the literature. We identify four ROSAT X-ray sources that are each matched to three WISE-selected AGNs in the R90 sample within 30.. Spectroscopy reveals that one of these systems, 2RXS J150158.6+691029, consists of a triplet of quasars at z = 1.133 +/- 0.004, suggestive of a rich group or forming galaxy cluster.</P>
A Luminous Transient Event in a Sample of <i>WISE</i>-selected Variable AGNs
Assef, R. J.,Prieto, J. L.,Stern, D.,Cutri, R. M.,Eisenhardt, P. R. M.,Graham, M. J.,Jun, H. D.,Rest, A.,Flewelling, H. A.,Kaiser, N.,Kudritzki, R.-P.,Waters, C. American Astronomical Society 2018 The Astrophysical journal Vol.866 No.1
The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6
Dí,az-Santos, T.,Assef, R. J.,Blain, A. W.,Aravena, M.,Stern, D.,Tsai, C.-W.,Eisenhardt, P.,Wu, J.,Jun, H. D.,Dibert, K.,Inami, H.,Lansbury, G.,Leclercq, F. American Association for the Advancement of Scienc 2018 Science Vol.362 No.6418
<P><B>Mergers drive a powerful dusty quasar</B></P><P>Massive galaxies in the early Universe host supermassive black holes at their centers. When material falls toward the black hole, it releases energy and is observed as a quasar. Astronomers found a population of powerful distant quasars that are obscured by dust, but it has been unclear how they are formed. Díaz-Santos <I>et al.</I> observed the dust-obscured quasar WISE J224607.56-052634.9 at submillimeter wavelengths, finding three small companion galaxies connected to the quasar by bridges of gas and dust. They inferred that galaxy mergers can provide both the raw material to power a quasar and large quantities of dust to obscure it.</P><P><I>Science</I>, this issue p. 1034</P><P>Galaxy mergers and gas accretion from the cosmic web drove the growth of galaxies and their central black holes at early epochs. We report spectroscopic imaging of a multiple merger event in the most luminous known galaxy, WISE J224607.56−052634.9 (W2246−0526), a dust-obscured quasar at redshift 4.6, 1.3 billion years after the Big Bang. Far-infrared dust continuum observations show three galaxy companions around W2246−0526 with disturbed morphologies, connected by streams of dust likely produced by the dynamical interaction. The detection of tidal dusty bridges shows that W2246−0526 is accreting its neighbors, suggesting that merger activity may be a dominant mechanism through which the most luminous galaxies simultaneously obscure and feed their central supermassive black holes.</P>
Super-Eddington Accretion in the <i>WISE</i>-selected Extremely Luminous Infrared Galaxy W2246−0526
Tsai, Chao-Wei,Eisenhardt, Peter R. M.,Jun, Hyunsung D.,Wu, Jingwen,Assef, Roberto J.,Blain, Andrew W.,Dí,az-Santos, Tanio,Jones, Suzy F.,Stern, Daniel,Wright, Edward L.,Yeh, Sherry C. C. American Astronomical Society 2018 The Astrophysical journal Vol.868 No.1
( Fernanda Cordeiro De Azevedo Conejo ),( Mabel Tatty Medeiros Fracassi ),( Mauricio Saab Assef ),( Mauricio Alves Ribeiro ),( Luiz Arnaldo Szutan ),( Fabio Goncalves Ferreira ) 대한소화기학회 2017 대한소화기학회지 Vol.69 No.5
Background/Aims: Portal hypertension (PH) is a syndrome characterized by chronic increase in the pressure gradient between the portal vein and inferior vena cava. Previous studies have suggested an increased frequency of antral elevated erosive gastritis in patients with PH, as well as an etiologic association; however, there has not been any histological evidence of this hypothesis to date. Our aim was to evaluate the histological features found in elevated antral erosions in patients with portal hypertension. Methods: Sixty-nine patients were included; 28 with and 41 without PH. All patients underwent endoscopy, and areas with elevated antral erosion were biopsied. Results: In the PH group, 24 patients had inflammatory infiltration with or without edema and vascular congestion, and 4 patients had no inflammation. In the group without PH, all patients showed inflammatory infiltration of variable intensity. There was no statistical significance between the two groups in the presence of Helicobacter pylori. There as a histological similarity between the two groups, if PH patients without inflammation were excluded; however, more edema and vascular congestion were observed in the PH group (p=0.002). Conclusions: The findings show that elevated antral erosions in patients with PH have more evident edema and vascular congestion in addition to lymphocytic infiltration. (Korean J Gastroenterol 2017;69:278-282)
A new physical interpretation of optical and infrared variability in quasars
Ross, Nicholas P,Ford, K E Saavik,Graham, Matthew,McKernan, Barry,Stern, Daniel,Meisner, Aaron M,Assef, Roberto J,Dey, Arjun,Drake, Andrew J,Jun, Hyunsung D,Lang, Dustin Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.480 No.4
The environments of luminous radio-WISE selected infrared galaxies
Penney, J I,Blain, A W,Wylezalek, D,Hatch, N A,Lonsdale, C,Kimball, A,Assef, R J,Condon, J J,Eisenhardt, P R M,Jones, S F,Kim, M,Lacy, M,Muldrew, S I,Petty, S,Sajina, A,Silva, A,Stern, D,Diaz-Santos, Oxford University Press 2019 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.483 No.1
Park, Daeseong,Barth, Aaron J.,Woo, Jong-Hak,Malkan, Matthew A.,Treu, Tommaso,Bennert, Vardha N.,Assef, Roberto J.,Pancoast, Anna American Astronomical Society 2017 The Astrophysical journal Vol.839 No.2
<P>We provide an updated calibration of C IV lambda 1549 broad emission line-based single-epoch (SE) black hole (BH) mass estimators for active galactic nuclei (AGNs) using new data for six reverberation-mapped AGNs at redshift z = 0.005-0.028 with BH masses (bolometric luminosities) in the range 10(6.5)-10(7.5) M-circle dot (10(41.7)-10(43.8) erg s(-1)). New rest-frame UV-to-optical spectra covering 1150-5700 angstrom for the six AGNs were obtained with the Hubble Space Telescope (HST). Multicomponent spectral decompositions of the HST spectra were used to measure SE emission-line widths for the C IV, MgII, and H beta lines, as well as continuum luminosities in the spectral region around each line. We combine the new data with similar measurements for a previous archival sample of 25 AGNs to derive the most consistent and accurate calibrations of the C IV-based SE BH mass estimators against the H beta reverberation-based masses, using three different measures of broad-line width: full. width at half maximum (FWHM), line dispersion (sigma line), and mean absolute deviation (MAD). The newly expanded sample at redshift wz = 0.005-0.234 covers a dynamic range in BH mass (bolometric luminosity) of logM(BH)/M-circle dot = 6.5-9.1 (log L-bol/ erg s(-1) = 41.7-46.9), and we derive the new C IV-based mass estimators using a Bayesian linear regression analysis over this range. We generally recommend the use of sigma line or MAD rather than FWHM to obtain a less biased velocity measurement of the C IV emission line, because its narrow-line component contribution is difficult to decompose from the broad-line profile.</P>
Investigating the Evolution of the Dual AGN System ESO 509-IG066
Kosec, P.,Brightman, M.,Stern, D.,Mü,ller-Sá,nchez, F.,Koss, M.,Oh, K.,Assef, R. J.,Gandhi, P.,Harrison, F. A.,Jun, H.,Masini, A.,Ricci, C.,Walton, D. J.,Treister, E.,Comerford, J.,Privon, G American Astronomical Society 2017 The Astrophysical Journal Vol.850 No.2
Musial Diego Castro,de Carvalho Alexia Juvencio,Vitela Alberto Parra,Schiochet Vinicius Jose Costa,de Lima Assef Maria da Graça Pasquotto 대한내분비외과학회 2023 The Koreran journal of Endocrine Surgery Vol.23 No.1
Insulinoma is a very rare neuroendocrine tumor that causes hypoglycemia and neuroglycopenic symptoms. Initial diagnostic imaging tests include ultrasound, computed tomography and magnetic resonance imaging. In most cases surgical treatment of insulinoma results in complete recovery. In this paper we described a rare case of insulinoma misdiagnosed with schizophrenia.