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340 results on '"Lin, T T"'

108. Poor outcome in post transplant lymphoproliferative disorder with pulmonary involvement after allogeneic hematopoietic SCT: 13 years' experience in a single institute

Author

Hou, H-A, primary, Yao, M, additional, Tang, J-L, additional, Chen, Y-K, additional, Ko, B-S, additional, Huang, S-Y, additional, Tien, H-F, additional, Chang, H-H, additional, Lu, M-Y, additional, Lin, T-T, additional, Lin, K-H, additional, Hsiao, C-H, additional, Lin, C-W, additional, and Chen, Y-C, additional

Published
2008
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122. Highly purified CD38+ and CD38− sub-clones derived from the same chronic lymphocytic leukemia patient have distinct gene expression signatures despite their monoclonal origin.

Author

Pepper, C., Ward, R., Lin, T. T., Brennan, P., Starczynski, J., Musson, M., Rowntree, C., Bentley, P., Mills, K., Pratt, G., and Fegan, C.

Subjects
LYMPHOCYTIC leukemia, CD antigens, GENE expression, VASCULAR endothelial growth factors, LEUKEMIA, PROGNOSIS
Abstract

CD38 expression is an important prognostic marker in chronic lymphocytic leukemia (CLL) with high levels of CD38 associated with shorter overall survival. In this study, we used gene expression profiling and protein analysis of highly purified cell-sorted CD38+ and CD38− chronic lymphocytic leukemia cells to elucidate a molecular basis for the association between CD38 expression and inferior clinical outcome. Paired CD38+ and CD38− CLL cells derived from the same patient were shown to be monoclonal by VH gene sequencing but despite this, CD38+ CLL cells possessed a distinct gene expression profile when compared with their CD38− sub-clones. Importantly, CD38+ CLL cells relatively over expressed vascular endothelial growth factor (VEGF) and appeared to preferentially utilize an internal autocrine VEGF survival loop. Elevated VEGF expression was associated with increased expression of the anti-apoptotic protein Mcl-1. Inhibition of VEGF receptor signaling also resulted in a reduction in cell viability. In contrast, exogenous VEGF caused a significant increase in CD38− CLL cell viability and a marked induction of Mcl-1; both effects were less obvious in CD38+ CLL cells. Taken together, our data provide a biological rationale for the poor prognosis of CD38+ CLL and indicate that both VEGF and Mcl-1 may prove to be useful therapeutic targets.Leukemia (2007) 21, 687–696. doi:10.1038/sj.leu.2404587; published online 8 February 2007 [ABSTRACT FROM AUTHOR]

Published
2007
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123. Microanalytical Characterizations of Eroded and Slaked Mudstone Proposed as Landfill Liner Material.

Author

Lin, T. T. and Cheng, C. H.

Subjects
SEDIMENTARY rocks, MICROCHEMISTRY, MUDSTONE, SODIUM, SODIUM sulfate
Abstract

An understanding of microanalytical characterizations would be useful to explain the hydraulic behavior of water across the slaked mudstone liner. It is further expected that the mudstone material could be designed for replacing clay material as a natural landfill liner. The result of the semidynamic leach test indicated that the released sodium species are very rapid and large. The microanalysis of the eroded mudstone indicated many white short rod-like conglomerates. The x-ray diffraction examination clearly illustrated that the white crystalline compound is sodium sulfate. Other micrographs indicated that many petal-like grains are present in the permeated mudstone. In addition, the microchemical result revealed that the flat-like grain could be a sand phase and the petal-like structure is possibly a clay phase (illite). Therefore, it is inferred that the possible characterizations of the eroded and slaked mudstone are stated as follows. The swelling and slaking behaviors of the mudstone possibly contributed to the dissolution of sodium sulfate. The surface of the permeated mudstone might present a lot of clay phases (illite) to reduce water permeation. Thus, the slaked mudstone as a natural landfill liner is feasible. [ABSTRACT FROM AUTHOR]

Published
2006
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124. Simulation of Lead Ions Adsorption onto the Iron-Coated Medium: Dependent on Temperature and pH.

Author

Lai, C. H., Gao, C. K., Lin, T. T., Yeh, S. H., Chen, C. Y., and Wang, M. K.

Subjects
ADSORPTION (Chemistry), GOETHITE, CATIONS, LEAD, IRON, SEPARATION (Technology)
Abstract

Heat was employed to coat crystalline goethite onto a quartz sand surface so that the adsorbent properties of the coating could be utilized. Adsorption experiments were conducted to further demonstrate the adsorption of lead ions by goethite-coated medium under various temperatures and pH, respectively. The adsorption reaction between iron-coated medium and lead ions was simulated by a cation exchange model. Results indicated that the solution temperature and pH had a noticeable effect on the final adsorption capacity for lead ions. The pH-adsorption edges were shifted to lower pH values with increasing temperature. The adsorption reaction between lead ions and goethite-coated medium was an endothermic process. A cation exchange model applied to the regression model of experimental data was fitted very well. A high correlation coefficient (r2=0.91) and an extreme low p-value (7.02×10-82) indicated that the variance of dependent variable, adsorption capacity of iron-coated medium could be firmly explained by independent variables such as [Pb+n], temperature and [H+]. [ABSTRACT FROM AUTHOR]

Published
2006
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125. Cryopreservation of Drosophila melanogaster embryos

Author

Steponkus, P. L., primary, Myers, S. P., additional, Lynch, D. V., additional, Gardner, L., additional, Bronshteyn, V., additional, Leibo, S. P., additional, Rall, W. F., additional, Pitt, R.E., additional, Lin, T.-T., additional, and Maclntyre, R. J., additional

Published
1990
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126. Thick polymer cover layers for laser micromachining of fine holes.

Author

Li, Z. L., Lin, T. T., and Moran, P. M.

Subjects
*POLYMERS, *MICROMACHINING, *LASER beams, *ULTRAVIOLET radiation, *QUARTZ, *DRILLING & boring
Abstract

We have demonstrated that a thick polymer cover layer can significantly improve UV laser micromachining. The polymer cover layer acts as a wave-guide, concentrating the incoming laser beam onto the underlying substrate to be machined. With this method very low laser fluences can be used to drill fine, high aspect ratio holes in quartz, glass and other materials that are generally difficult to machine. We show that despite the improvements recorded, our experimental conditions are not optimized and the contribution of the cover layers in our experiments is less than what it could be. We suggest improvements to the cover layer material to improve the micomachining. The method has important advantages over conventional methods since a mask is not required and common laser equipment can be used to quickly and inexpensively form desired holes within the substrate. [ABSTRACT FROM AUTHOR]

Published
2005
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127. Detection of Helicobacter pylori by polymerase chain reaction assay using gastric biopsy specimens taken for CLOtest.

Author

Lin, Tin-Tsan, Yeh, Chau-Ting, Yang, Ellen, Chen, Pang-Chi, Lin, T T, Yeh, C T, Yang, E, and Chen, P C

Abstract

The concordance rate between a rapid urease test (CLOtest) and polymerase chain reaction (PCR) assay for the detection of Helicobacter pylori in gastric biopsy samples was investigated. To avoid the bias produced by patchy distribution of the organism in the stomach, the samples used for these two tests were not obtained from two different sites of the antrum. Instead, the PCR assay was performed with the the same biopsy sample that was taken for the CLOtest. Among 82 biopsy samples included for this study, 56 were positive and 26 were negative by CLOtest. Of the 56 CLOtest-positive samples, 52 (93%) were also positive by PCR assay, and of the 26 CLOtest-negative samples, 20 (78%) were negative by PCR assay. The total concordance rate of these two tests was 87.6%. Of the 4 cases with CLOtest-positive and PCR-negative results, 3 had been treated with long-term H2 blockers. Of the 6 patients with CLOtest-negative and PCR-positive results, 4 suffered from recurrent or poorly healing duodenal ulcers. Interestingly, a significantly lower density of the PCR products was observed during electrophoresis analysis for all the 6 cases, presumably due to a small number of H. pylori in these samples. These results indicated that PCR might be used as a complementary assay for CLOtest. False negative results by CLOtest might occur when only a small amount of H. pylori was present in the samples, which could be detected by subsequent PCR assays using the same biopsy specimens. The clinical significance of such CLOtest-negative and PCR-positive cases requires further study. [ABSTRACT FROM AUTHOR]

Published
1996
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128. NON-DESTRUCTIVE GROWTH MEASUREMENT OF SELECTED VEGETABLE SEEDLINGS USING ORTHOGONAL IMAGES.

Author

Chien, C. F. and Lin, T. T.

Subjects
*PLANT growth, *PLANTS, *IMAGE processing, *LEAVES, *SEEDLINGS
Abstract

A non-destructive measurement method of plant features using image processing technique provides a means to analyze the continuous growth process of a plant. In a previous study, we developed a non-destructive measurement method by using elliptical Hough transform to search for seedling leaves from a top-view image. To improve the accuracy of the leaf number estimation and leaf area measurement, this study further incorporates two side-view images with a top-view image to extract and reconstruct the three-dimensional structure of selected vegetable seedlings, and thus to measure the features related to plant growth. By registering correspondences between the three orthogonal images, the position, orientation, and dimensions of leaves in a seedling can be more exactly derived than from a single top-view image alone. The leaf skeletons traced in the side-view images can be used to correct the projected leaf area in the top-view image for better estimation of leaf area. Experiments were performed to test the performance of the measurement system by comparing the non-destructively estimated leaf area and the actual leaf area of selected vegetable seedlings. The average relative errors of total leaf estimation for cabbage and broccoli seedlings were 14.5% and 13.1%, respectively, using a single top-view image. By incorporating orthogonal images, the relative errors were significantly reduced to 1.6% and 4. 9%, respectively. Using this non-destructive measurement system, the continuous growth of vegetable seedlings can be effectively measured. [ABSTRACT FROM AUTHOR]

Published
2005
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131. Structures and Cytotoxicity Relationship of Isoaaptamine and Aaptamine Derivatives

Author

Shen, Y.-C., Lin, T.-T., Sheu, J.-H., and Duh, C.-Y.

Abstract

A series of 9-O-acylisoaaptamine (3−14) and 4-N-acyl-dihydroaaptamine (16−19) derivatives have been prepared and evaluated for antitumor activity against murine P-388 and human tumor cells including KB16, A549, and HT-29 cell lines. All of compounds showed significant cytotoxicity against P-388 cells. Among them, compounds 9−11 showed potent activity as isoaaptamine (1). There was an apparent lack of linear relationship between cytotoxicity and carbon number of the side chain. The structure and activity relationship for these particular compounds are discussed.

Published
1999

137. Role of interferon regulatory factor-1 in the induction of biliary glycoprotein (cell CAM-1) by interferon-gamma.

Author

Chen, C J, Lin, T T, and Shively, J E

Abstract

Biliary glycoprotein (BGP), also known as C-CAM-1, has been shown to be down-regulated in colon and prostate tumors. Previously, we demonstrated that BGP mRNA is up-regulated by interferon-gamma (IFN-gamma) in colon cancer cell lines (Takahashi, H., Okai, Y., Paxton, R. J., Hefta, L. J. F., and Shively, J. E. (1993) Cancer Res. 53, 1612-1619). We now show that the BGP promoter contains an interferon-sensitive response element (ISRE) that is specifically protected in in vivo footprints. Interferon regulatory factor-1 (IRF-1) was identified as the ISRE-binding factor by electrophoretic mobility shift assays. The induction of IRF-1 mRNA by IFN-gamma in HT-29 cells reaches a maximum at 6 h and is superinduced by cycloheximide. Four mRNA species for BGP are induced by IFN-gamma, the major band of which is inhibited by cycloheximide. Transfection of HT-29 cells with an IRF-1 expression plasmid (pAct-1) transactivates a BGP promoter reporter gene containing wild-type (but not mutant) ISRE. Electrophoretic mobility shift assay analysis of a second footprint reveals the binding of Sp1, an Sp1-like protein, and upstream stimulatory factor. The Sp1-like complex was also induced by IFN-gamma treatment of HT-29 cells and may be a second point of transcriptional control for the BGP gene.

Published
1996

138. Extreme HBL behavior of Markarian 501 during 2012

Author

Ahnen, M. L., Ansoldi, S., Bednarek, W., Paredes, J. M., Pedaletti, Giovanna, Peresano, M., Perri, L., Persic$, Prada Moroni, P. G., Prandini, E., Puljak, I., Garcia, J. R., Reichardt, I., Bernardini, E., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Saito, T., Satalecka, K., Schroeder, S., Schweizer, T., Shore, S. N., Sitarek, J., Berti, A., Šnidarić, I., Sobczynska, D., Stamerra, A., Strzys, M., Surić, T., Takalo, L., Tavecchio, F., Temnikov, P., Terzić, T., Teshima, M., Bhattacharyya, W., Torres-Albà, N., Treves, A., Tsujimoto, S., Vanzo, G., Vazquez Acosta, M., Vovk, I., Ward, J. E., Will, M., Zarić, D., Arbet-Engels, A., Blanch, O., Baack, D., Balbo, M., Biland, A., Blank, M., Bretz, T., Bruegge, K., Bulinski, M., Buss, J., Dmytriiev, A., Dorner, D., Bonnoli, G., Einecke, S., Elsaesser, D., Herbst, T., Hildebrand, D., Kortmann, L., Linhoff, L., Mahlke, M., Mannheim, K., Mueller, S. A., Neise, D., Carosi, R., Neronov, A., Noethe, M., Oberkirch, J., Paravac, A., Rhode, W., Schleicher, B., Schulz, F., Sedlaczek, K., Shukla, A., Sliusar, V., Carosi, A., Walter, R., Archer, A., Benbow, W., Bird, R., Brose, R., Buckley, J. H., Bugaev, V., Christiansen, J. L., Cui, W., Daniel, M. K., Chatterjee, A., Falcone, A., Feng, Q., Finley, J. P., Gillanders, G. H., Gueta, O., Hanna, D., Hervet, O., Holder, J., Hughes, G., Huetten, Moritz, Colak, S. M., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kelley-Hoskins, N., Kertzman, M., Kieda, D., Krause, Maria, Krennrich, F., Kumar, S., Antonelli, L. A., Colin, P., Lang, M. J., Lin, T. T. Y., Maier, Gernot, McArthur, S., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Otte, A. N., Park, N., Colombo, E., Petrashyk, A., Pichel, A., Pohl, Martin, Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rovero, A. C., Rulten, C., Contreras, J. L., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Sushch, I., Tyler, J., Wakely, S. P., Weinstein, A., Wells, R. M., Wilcox, P., Cortina, J., Wilhel, A., Williams, D. A., J Williamson, T., Zitzer, B., Perri, M., Verrecchia, F., Leto, C., Villata, M., Raiteri, C. M., Larionov, V. M., Covino, S., Blinov, D. A., Grishina, T. S., Kopatskaya, E. N., Larionova, E. G., Nikiforova, A. A., Morozova, D. A., Troitskaya, Yu. V., Troitsky, I. S., Kurtanidze, O. M., Nikolashvili, M. G., Cumani, P., Kurtanidze, S. O., Kimeridze, G. N., Chigladze, R. A., Strigachev, A., Sadun, A. C., Moody, J. W., Chen, W. P., Lin, H. C., Acosta-Pulido, J. A., Arévalo, M. J., Da Vela, P., Carnerero, M. I., González-Morales, P. A., Manilla-Robles, A., Jermak, H., Steele, I., Mundel, C., Benítez, E., Hiriart, D., Smith, P. S., Max-Moerbeck, W., Dazzi, F., Readhead, A. C. S., Richards, J. L., Hovatta, T., Lähteenmäki, A., Tornikoski, M., Tammi, J., Georganopoulos, M., Baring, M. G., MAGIC Collaboration, FACT Collaboration, De Angelis, A., VERITAS Collaboration, De Lotto, B., Arcaro, C., Delfino, M., Delgado, J., Di Pierro, F., Doert, M., Domínguez, A., Dominis Prester, D., Doro, M., Eisenacher Glawion, D., Engelkemeier, M., Fallah Ramazani, V., Babić, A., Fernández-Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Fruck, C., Galindo, D., García López, R. J., Garczarczyk, M., Gaug, M., Giammaria, P., Banerjee, B., Godinović, N., Gora, D., Guberman, D., Hadasch, D., Hahn, A., Hassan, T., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Bangale, P., Ishio, K., Konno, Y., Kubo, H., Kushida, J., Kuveždić, D., Lelas, D., Lindfors, E., Lombardi, S., Longo, F., López, M., Barres de Almeida, U., Maggio, C., Majumdar, P., Makariev, M., Maneva, G., Manganaro, M., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Barrio, J. A., Minev, M., Miranda, J. M., Mirzoyan, R., Moralejo, A., Moreno, V., Moretti, E., Nagayoshi, T., Neustroev, V., Niedzwiecki, A., Nievas Rosillo, M., Becerra González, J., Nigro, C., Nilsson, K., Ninci, D., Nishijima, K., Noda, K., Nogués, L., Paiano, S., Palacio, J., Paneque, D., Paoletti, R., Universitat de Barcelona, Department of Electronics and Nanoengineering, Aalto-yliopisto, Aalto University, Ahnen, M. L., Ansoldi, S., Antonelli, L. A., Arcaro, C., Babić, A., Banerjee, B., Bangale, P., Barresde Almeida, U., Barrio, J. A., Becerragonzález, J., Bednarek, W., Bernardini, E., Berti, A., Bhattacharyya, W., Blanch, O., Bonnoli, G., Carosi, R., Carosi, A., Chatterjee, A., Colak, S. M., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Cumani, P., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Delfino, M., Delgado, J., Di Ierro, F., Doert, M., Domínguez, A., Dominis Prester, D., Doro, M., Eisenacher Lawion, D., Engelkemeier, M., Fallah Ramazani, V., Fernández-Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Fruck, C., Galindo, D., García López, R. J., Garczarczyk, M., Gaug, M., Giammaria, P., Godinović, N., Gora, D., Guberman, D., Hadasch, D., Hahn, A., Hassan, T., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Ishio, K., Konno, Y., Kubo, H., Kushida, J., Kuve Dić, D., Lelas, D., Lindfors, E., Lombardi, S., Longo, F., López, M., Maggio, C., Majumdar, P., Makariev, M., Maneva, G., Manganaro, M., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Minev, M., Miranda, J. M., Mirzoyan, R., Moralejo, A., Moreno, V., Moretti, E., Nagayoshi, T., Neustroev, V., Niedzwiecki, A., Nievas Rosillo, M., Nigro, C., Nilsson, K., Ninci, D., Nishijima, K., Noda, K., Nogués, L., Paiano, S., Palacio, J., Paneque, D., Paoletti, R., Paredes, J. M., Pedaletti, G., Peresano, M., Perri, L., Persic, M., Prada Moroni, P. G., Prandini, E., Puljak, I., Garcia, J. R., Reichardt, I., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Saito, T., Satalecka, K., Schroeder, S., Schweizer, T., Shore, S. N., Sitarek, J., Šnidarić, I., Sobczynska, D., Stamerra, A., Strzys, M., Surić, T., Takalo, L., Tavecchio, F., Temnikov, P., Terzić, T., Teshima, M., Torres-Albà, N., Treves, A., Tsujimoto, S., Vanzo, G., Vazquez Acosta, M., Vovk, I., Ward, J. E., Will, M., Zarić, D., Arbet-Engels, A., Baack, D., Balbo, M., Biland, A., Blank, M., Bretz, T., Bruegge, K., Bulinski, M., Buss, J., Dmytriiev, A., Dorner, D., Einecke, S., Elsaesser, D., Herbst, T., Hildebrand, D., Kortmann, L., Linhoff, L., Mahlke, M., Mannheim, K., Mueller, S. A., Neise, D., Neronov, A., Noethe, M., Oberkirch, J., Paravac, A., Rhode, W., Schleicher, B., Schulz, F., Sedlaczek, K., Shukla, A., Sliusar, V., Walter, R., Archer, A., Benbow, W., Bird, R., Brose, R., Buckley, J. H., Bugaev, V., Christiansen, J. L., Cui, W., Daniel, M. K., Falcone, A., Feng, Q., Finley, J. P., Gillanders, G. H., Gueta, O., Hanna, D., Hervet, O., Holder, J., Hughes, G., Hütten, M., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kelley-Hoskins, N., Kertzman, M., Kieda, D., Krause, M., Krennrich, F., Kumar, S., Lang, M. J., Lin, T. T. Y., Maier, G., Mcarthur, S., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Otte, A. N., Park, N., Petrashyk, A., Pichel, A., Pohl, M., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rovero, A. C., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Sushch, I., Tyler, J., Wakely, S. P., Weinstein, A., Wells, R. M., Wilcox, P., Wilhel, A., Williams, D. A., J Williamson, T., Zitzer, B., Perri, M., Verrecchia, F., Leto, C., Villata, M., Raiteri, C. M., Jorstad, S. G., Larionov, V. M., Blinov, D. A., Grishina, T. S., Kopatskaya, E. N., Larionova, E. G., Nikiforova, A. A., Morozova, D. A., Troitskaya, Yu. V., Troitsky, I. S., Kurtanidze, O. M., Nikolashvili, M. G., Kurtanidze, S. O., Kimeridze, G. N., Chigladze, R. A., Strigachev, A., Sadun, A. C., Moody, J. W., Chen, W. P., Lin, H. C., Acosta-Pulido, J. A., Arévalo, M. J., Carnerero, M. I., González-Morales, P. A., Manilla-Robles, A., Jermak, H., Steele, I., Mundell, C., Benítez, E., Hiriart, D., Smith, P. S., Max-Moerbeck, W., Readhead, A. C. S., Richards, J. L., Hovatta, T., Lähteenmäki, A., Tornikoski, M., Tammi, J., Georganopoulos, M., Baring, M. G., Swiss Federal Institute of Technology Zurich, University of Udine, Osservatorio Astronomicodi Roma, University of Padova, University of Rijeka, Saha Institute of Nuclear Physics, Max-Planck-Institut fur Physik (Werner-Heisenberg-Institut) Munchen, Complutense University, Instituto Astrofisico de Canarias, University of Lódz, Deutsches Elektronensynchroton DESY, Deutsches Elektronen-Synchrotron, Barcelona Institute of Science and Technology, University of Siena, University of La Laguna, Università di Padova and INFN, Technische Universität Dortmund, University of Würzburg, University of Turku, Autonomous University of Barcelona, University of Barcelona, University of Tokyo, Universitat Autonoma de Barcelona, Bulgarian Academy of Sciences, and Metsähovi Radio Observatory

Subjects
Astrofísica, Acceleration of particles, Radiation mechanisms: non-thermal, VHE [gamma ray], astroparticle physics, acceleration of particles, radiation mechanisms: non-thermal, BL Lacertae objects: general, BL Lacertae objects: individual: Mrk501, Astrophysics, 01 natural sciences, Spectral line, law.invention, law, Gamma ray astronomy, flux [gamma ray], individual: Mrk501 [BL Lacertae objects], MAGIC (telescope), 010303 astronomy & astrophysics, QC, QB, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Astroparticle physics, Astronomy and Astrophysics, Space and Planetary Science, BL Lacertae objects: individual: Markarian 501, Methods: data analysis, Methods: observational, Polarization, Acceleration of particle, Synchrotron, VERITAS, Física nuclear, Compton scattering, Astrophysics - High Energy Astrophysical Phenomena, density [energy], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astroparticle physic, blazar, 0103 physical sciences, synchrotron, Astronomia de raigs gamma, Blazar, energy [electron], Cherenkov radiation, emission [energy], non-thermal [Radiation mechanisms], 010308 nuclear & particles physics, general [BL Lacertae objects], energy spectrum [X-ray], Institut für Physik und Astronomie, Spectral component, Astronomy and Astrophysic, Galaxies, MAGIC, Galàxies, Astronomía, Crab Nebula, Cherenkov counter, injection, 115 Astronomy and space science, correlation, fractional, ddc:520, spectral, Fermi Gamma-ray Space Telescope
Abstract

A multiwavelength campaign was organized to take place between March and July of 2012. Excellent temporal coverage was obtained with more than 25 instruments, including the MAGIC, FACT and VERITAS Cherenkov telescopes, the instruments on board the Swift and Fermi spacecraft, and the telescopes operated by the GASP-WEBT collaboration. Mrk 501 showed a very high energy (VHE) gamma-ray flux above 0.2 TeV of $\sim$0.5 times the Crab Nebula flux (CU) for most of the campaign. The highest activity occurred on 2012 June 9, when the VHE flux was $\sim$3 CU, and the peak of the high-energy spectral component was found to be at $\sim$2 TeV. This study reports very hard X-ray spectra, and the hardest VHE spectra measured to date for Mrk 501. The fractional variability was found to increase with energy, with the highest variability occurring at VHE, and a significant correlation between the X-ray and VHE bands. The unprecedentedly hard X-ray and VHE spectra measured imply that their low- and high-energy components peaked above 5 keV and 0.5 TeV, respectively, during a large fraction of the observing campaign, and hence that Mrk 501 behaved like an extreme high-frequency- peaked blazar (EHBL) throughout the 2012 observing season. This suggests that being an EHBL may not be a permanent characteristic of a blazar, but rather a state which may change over time. The one-zone synchrotron self-Compton (SSC) scenario can successfully describe the segments of the SED where most energy is emitted, with a significant correlation between the electron energy density and the VHE gamma-ray activity, suggesting that most of the variability may be explained by the injection of high-energy electrons. The one-zone SSC scenario used reproduces the behaviour seen between the measured X-ray and VHE gamma-ray fluxes, and predicts that the correlation becomes stronger with increasing energy of the X-rays., Comment: 25 pages, 9 figures, accepted for publication in A&A. Corresponding authors: Gareth Hughes (gareth.hughes@cfa.harvard.edu), David Paneque (dpaneque@mppmu.mpg.de), Amit Shukla (amit.shukla@astro.uni-wuerzburg.de)

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139. Monolayer-scale AlN/GaN digital alloys grown by plasma-assisted molecular beam epitaxy.

Author

Li, Siqi, Liang, Xiao, Shao, Pengfei, Chen, Songlin, Li, Zhenhua, Su, Xujun, Tao, Tao, Xie, Zili, Khan, M. Ajmal, Wang, Li, Lin, T. T., Hirayama, Hideki, Liu, Bin, Chen, Dunjun, Wang, Ke, and Zhang, Rong

Subjects
*MOLECULAR beam epitaxy, *TRANSMISSION electron microscopy, *ELECTRON density, *IONIZATION energy, *REDSHIFT
Abstract

The efficiency of usual AlGaN based deep ultraviolet light-emitting devices is still quite low. The difficulties are basically originated from the fundamental material properties of AlGaN. This work has adopted monolayer-scale (AlN)m/(GaN)n ordered digital alloys (DAs) as alternatives to AlGaN random alloys, m and n are the numbers of monolayers. X-ray diffraction scans have demonstrated clear satellite peaks, verifying good periodicity of AlN/GaN DAs grown by molecular beam epitaxy (MBE), and transmission electron microscopy results have revealed atomically sharp and smooth interfaces and quite precise m:n values agreeing well with designs. The electron densities of Si-doped (AlN)m/(GaN)n DAs with high equivalent Al compositions are significantly higher than those of conventional AlGaN:Si random alloys grown in the same MBE system. Si dopant ionization energies in DAs are only 2–5 meV, much lower than that for usual random alloys. The red shift of the light emission for DAs with thinner AlN barriers has suggested strong coupling between the GaN wells and thus formation of a miniband in a vertical direction. The results have demonstrated the potential of the (AlN)m/(GaN)n DAs as electronically functional alternatives for various device applications. [ABSTRACT FROM AUTHOR]

Published
2024
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140. LEARNING, ADAPTATION AND CONTROL IN INFORMATION SYSTEMS; PT I

Author

COMPUTER SCIENCES LAB NORTHWESTERN TECHNOLOGICAL INST EVANSTON ILL, Tou,J. T., Hsieh,H. C., Szego,G. P., Lin,T. T., Nuspl,P. P., COMPUTER SCIENCES LAB NORTHWESTERN TECHNOLOGICAL INST EVANSTON ILL, Tou,J. T., Hsieh,H. C., Szego,G. P., Lin,T. T., and Nuspl,P. P.

Abstract

A study was made of optimal control in the continuous control mode and in the discrete mode. Comparisons are made between the two solutions with particular emphasis on practical implementation. The generalized quadratic performance index is used, as well as the integral of the control absolute value. Sub-optimal control in the discrete mode is investigated. Reasons for using sub-optimal control are discussed. A direct enumeration approach is used for a bang-off-bang problem. A second approach is to use a modified performance index with a smaller number of decisions. An important part of the paper is the design of a simple digital controller. This is a feasibility study and an application of computer design techniques. NAND logic and RST flip-flops are the controller modules. (Author)

Published
1964

145. A Strong Limit on the Very-high-energy Emission from GRB 150323A

Author

Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brose, R., Buchovecky, M., Bugaev, V., Connolly, M. P., Cui, W., Errando, M., Falcone, A., Feng, Q., Finley, J. P., Flinders, A., Fortson, L., Furniss, A., Gillanders, G. H., Hütten, M., Hanna, D., Hervet, O., Holder, J., Hughes, G., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kelley-Hoskins, N., Kertzman, M., Kieda, D., Krause, M., Krennrich, F., Lang, M. J., Lin, T. T. Y., Maier, G., McArthur, S., Moriarty, P., Mukherjee, R., O’Brien, S., Ong, R. A., Park, N., Perkins, J. S., Petrashyk, A., Pohl, M., Popkow, A., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Tyler, J., Wakely, S. P., Weiner, O. M., Weinstein, A., Wells, R. M., Wilcox, P., Wilhelm, Alina, Williams, D. A., Zitzer, B., Vurm, Indrek, and Beloborodov, Andrei

Subjects
13. Climate action
Abstract

The astrophysical journal 857(1), 33 (2018). doi:10.3847/1538-4357/aab371, On 2015 March 23, the Very Energetic Radiation Imaging Telescope Array System (VERITAS) responded to a Swift-Burst Alert Telescope (BAT) detection of a gamma-ray burst, with observations beginning 270 s after the onset of BAT emission, and only 135 s after the main BAT emission peak. No statistically significant signal is detected above 140 GeV. The VERITAS upper limit on the fluence in a 40-minute integration corresponds to about 1% of the prompt fluence. Our limit is particularly significant because the very-high-energy (VHE) observation started only ~2 minutes after the prompt emission peaked, and Fermi-Large Area Telescope observations of numerous other bursts have revealed that the high-energy emission is typically delayed relative to the prompt radiation and lasts significantly longer. Also, the proximity of GRB 150323A (z = 0.593) limits the attenuation by the extragalactic background light to ~50% at 100–200 GeV. We conclude that GRB 150323A had an intrinsically very weak high-energy afterglow, or that the GeV spectrum had a turnover below ~100 GeV. If the GRB exploded into the stellar wind of a massive progenitor, the VHE non-detection constrains the wind density parameter to be $A \gtrsim 3 × 10^{11} g$ cm$^{−1}$, consistent with a standard Wolf–Rayet progenitor. Alternatively, the VHE emission from the blast wave would be weak in a very tenuous medium such as the interstellar medium, which therefore cannot be ruled out as the environment of GRB 150323A., Published by IOP, Chicago, Ill. [u.a.]

146. VERITAS and Fermi -LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog

Author

Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brose, R., Buchovecky, M., Buckley, J. H., Bugaev, V., Chromey, A. J., Connolly, M. P., Cui, W., Daniel, M. K., Falcone, A., Feng, Q., Finley, J. P., Fortson, L., Furniss, A., Hütten, M., Hanna, D., Hervet, O., Holder, J., Hughes, G., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kertzman, M., Kieda, D., Krause, M., Krennrich, F., Kumar, S., Lang, M. J., Lin, T. T. Y., McArthur, S., Moriarty, P., Mukherjee, R., O’Brien, S., Ong, R. A., Otte, A. N., Park, N., Petrashyk, A., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Sushch, I., Tyler, J., Wakely, S. P., Weinstein, A., Wells, R. M., Wilcox, P., Wilhelm, A., Williams, D. A., Williamson, T. J, Zitzer, B., Abdollahi, S., Ajello, M., Baldini, L., Barbiellini, G., Bastieri, D., Bellazzini, R., Berenji, B., Bissaldi, E., Blandford, R. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buehler, R., Cameron, R. A., Caputo, R., Caraveo, P. A., Castro, D., Cavazzuti, E., Charles, E., Chiaro, G., Ciprini, S., Cohen-Tanugi, J., Costantin, D., Cutini, S., D’Ammando, F., Palma, F. De, Lalla, N. Di, Mauro, M. Di, Venere, L. Di, Domínguez, A., Favuzzi, C., Fegan, S. J., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Guillemot, L., Guiriec, S., Hays, E., Hewitt, J. W., Horan, D., Jóhannesson, G., Kensei, S., Kuss, M., Larsson, S., Latronico, L., Lemoine-Goumard, M., Li, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Magill, J. D., Maldera, S., Mazziotta, M. N., McEnery, J. E., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Negro, M., Nuss, E., Ojha, R., Omodei, N., Orienti, M., Orlando, E., Palatiello, M., Paliya, V. S., Paneque, D., Perkins, J. S., Persic, M., Pesce-Rollins, M., Petrosian, V., Piron, F., Porter, T. A., Principe, G., Rainò, S., Rando, R., Rani, B., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Sgrò, C., Siskind, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Thayer, J. B., Thompson, D. J., Torres, D. F., Tosti, G., Troja, E., Valverde, J., Vianello, G., Vogel, M., Wood, K., Yassine, M., Alfaro, R., Álvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., De León, S. Coutiño, León, C. De, Fuente, E. De La, Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enriquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G., Zepeda, A., and Zhou, H.

Subjects
13. Climate action
Abstract

The astrophysical journal 866(1), 24 (2018). doi:10.3847/1538-4357/aade4e, The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not associated with previously known teraelectronvolt (TeV) gamma-ray sources. We have studied 14 of these sources without known counterparts with VERITAS and Fermi-LAT. VERITAS detected weak gamma-ray emission in the 1 TeV–30 TeV band in the region of DA 495, a pulsar wind nebula coinciding with 2HWC J1953+294, confirming the discovery of the source by HAWC. We did not find any counterpart for the selected 14 new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected gigaelectronvolt (GeV) gamma-ray emission coincident with a known TeV pulsar wind nebula, SNR G54.1+0.3 (VER J1930+188), and a 2HWC source, 2HWC J1930+188. The fluxes for isolated, steady sources in the 2HWC catalog are generally in good agreement with those measured by imaging atmospheric Cherenkov telescopes. However, the VERITAS fluxes for SNR G54.1+0.3, DA 495, and TeV J2032+4130 are lower than those measured by HAWC, and several new HAWC sources are not detected by VERITAS. This is likely due to a change in spectral shape, source extension, or the influence of diffuse emission in the source region., Published by IOP, Chicago, Ill. [u.a.]

147. Human genome meeting 2016

Author

Srivastava, A. K., Wang, Y., Huang, R., Skinner, C., Thompson, T., Pollard, L., Wood, T., Luo, F., Stevenson, R., Polimanti, R., Gelernter, J., Lin, X., Lim, I. Y., Wu, Y., Teh, A. L., Chen, L., Aris, I. M., Soh, S. E., Tint, M. T., MacIsaac, J. L., Yap, F., Kwek, K., Saw, S. M., Kobor, M. S., Meaney, M. J., Godfrey, K. M., Chong, Y. S., Holbrook, J. D., Lee, Y. S., Gluckman, P. D., Karnani, N., Kapoor, A., Lee, D., Chakravarti, A., Maercker, C., Graf, F., Boutros, M., Stamoulis, G., Santoni, F., Makrythanasis, P., Letourneau, A., Guipponi, M., Panousis, N., Garieri, M., Ribaux, P., Falconnet, E., Borel, C., Antonarakis, S. E., Kumar, S., Curran, J., Blangero, J., Chatterjee, S., Akiyama, J., Auer, D., Berrios, C., Pennacchio, L., Donti, T. R., Cappuccio, G., Miller, M., Atwal, P., Kennedy, A., Cardon, A., Bacino, C., Emrick, L., Hertecant, J., Baumer, F., Porter, B., Bainbridge, M., Bonnen, P., Graham, B., Sutton, R., Sun, Q., Elsea, S., Hu, Z., Wang, P., Zhu, Y., Zhao, J., Xiong, M., Bennett, David A., Hidalgo-Miranda, A., Romero-Cordoba, S., Rodriguez-Cuevas, S., Rebollar-Vega, R., Tagliabue, E., Iorio, M., D’Ippolito, E., Baroni, S., Kaczkowski, B., Tanaka, Y., Kawaji, H., Sandelin, A., Andersson, R., Itoh, M., Lassmann, T., Hayashizaki, Y., Carninci, P., Forrest, A. R. R., Semple, C. A., Rosenthal, E. A., Shirts, B., Amendola, L., Gallego, C., Horike-Pyne, M., Burt, A., Robertson, P., Beyers, P., Nefcy, C., Veenstra, D., Hisama, F., Bennett, R., Dorschner, M., Nickerson, D., Smith, J., Patterson, K., Crosslin, D., Nassir, R., Zubair, N., Harrison, T., Peters, U., Jarvik, G., Menghi, F., Inaki, K., Woo, X., Kumar, P., Grzeda, K., Malhotra, A., Kim, H., Ucar, D., Shreckengast, P., Karuturi, K., Keck, J., Chuang, J., Liu, E. T., Ji, B., Tyler, A., Ananda, G., Carter, G., Nikbakht, H., Montagne, M., Zeinieh, M., Harutyunyan, A., Mcconechy, M., Jabado, N., Lavigne, P., Majewski, J., Goldstein, J. B., Overman, M., Varadhachary, G., Shroff, R., Wolff, R., Javle, M., Futreal, A., Fogelman, D., Bravo, L., Fajardo, W., Gomez, H., Castaneda, C., Rolfo, C., Pinto, J. A., Akdemir, K. C., Chin, L., Patterson, S., Statz, C., Mockus, S., Nikolaev, S. N., Bonilla, X. I., Parmentier, L., King, B., Bezrukov, F., Kaya, G., Zoete, V., Seplyarskiy, V., Sharpe, H., McKee, T., Popadin, K., Basset-Seguin, N., Chaabene, R. Ben, Andrianova, M., Verdan, C., Grosdemange, K., Sumara, O., Eilers, M., Aifantis, I., Michielin, O., de Sauvage, F., Antonarakis, S., Likhitrattanapisal, S., Lincoln, S., Kurian, A., Desmond, A., Yang, S., Kobayashi, Y., Ford, J., Ellisen, L., Peters, T. L., Alvarez, K. R., Hollingsworth, E. F., Lopez-Terrada, D. H., Hastie, A., Dzakula, Z., Pang, A. W., Lam, E. T., Anantharaman, T., Saghbini, M., Cao, H., Gonzaga-Jauregui, C., Ma, L., King, A., Rosenzweig, E. Berman, Krishnan, U., Reid, J. G., Overton, J. D., Dewey, F., Chung, W. K., Small, K., DeLuca, A., Cremers, F., Lewis, R. A., Puech, V., Bakall, B., Silva-Garcia, R., Rohrschneider, K., Leys, M., Shaya, F. S., Stone, E., Sobreira, N. L., Schiettecatte, F., Ling, H., Pugh, E., Witmer, D., Hetrick, K., Zhang, P., Doheny, K., Valle, D., Hamosh, A., Jhangiani, S. N., Akdemir, Z. Coban, Bainbridge, M. N., Charng, W., Wiszniewski, W., Gambin, T., Karaca, E., Bayram, Y., Eldomery, M. K., Posey, J., Doddapaneni, H., Hu, J., Sutton, V. R., Muzny, D. M., Boerwinkle, E. A., Lupski, J. R., Gibbs, R. A., Shekar, S., Salerno, W., English, A., Mangubat, A., Bruestle, J., Thorogood, A., Knoppers, B. M., Takahashi, H., Nitta, K. R., Kozhuharova, A., Suzuki, A. M., Sharma, H., Cotella, D., Santoro, C., Zucchelli, S., Gustincich, S., Mulvihill, J. J., Baynam, G., Gahl, W., Groft, S. C., Kosaki, K., Lasko, P., Melegh, B., Taruscio, D., Ghosh, R., Plon, S., Scherer, S., Qin, X., Sanghvi, R., Walker, K., Chiang, T., Muzny, D., Wang, L., Black, J., Boerwinkle, E., Weinshilboum, R., Gibbs, R., Karpinets, T., Calderone, T., Wani, K., Yu, X., Creasy, C., Haymaker, C., Forget, M., Nanda, V., Roszik, J., Wargo, J., Haydu, L., Song, X., Lazar, A., Gershenwald, J., Davies, M., Bernatchez, C., Zhang, J., Woodman, S., Chesler, E. J., Reynolds, T., Bubier, J. A., Phillips, C., Langston, M. A., Baker, E. J., Lin, N., Amos, C., Calhoun, V., Dobretsberger, O., Egger, M., Leimgruber, F., Sadedin, S., Oshlack, A., Antonio, V. A. A., Ono, N., Ahmed, Z., Bolisetty, M., Zeeshan, S., Anguiano, E., Sarkar, A., Nandineni, M. R., Zeng, C., Shao, J., Liang, T., Pham, K., Chee-Wei, Y., Dongsheng, L., Lai-Ping, W., Lian, D., Hee, R. O. Twee, Yunus, Y., Aghakhanian, F., Mokhtar, S. S., Lok-Yung, C. V., Bhak, J., Phipps, M., Shuhua, X., Yik-Ying, T., Kumar, V., Boon-Peng, H., Campbell, I., Young, M. -A., James, P., Rain, M., Mohammad, G., Kukreti, R., Pasha, Q., Akilzhanova, A. R., Guelly, C., Abilova, Z., Rakhimova, S., Akhmetova, A., Kairov, U., Trajanoski, S., Zhumadilov, Z., Bekbossynova, M., Schumacher, C., Sandhu, S., Harkins, T., Makarov, V., Glenn, R., Momin, Z., Dilrukshi, B., Chao, H., Meng, Q., Gudenkauf, B., Kshitij, R., Jayaseelan, J., Nessner, C., Lee, S., Blankenberg, K., Lewis, L., Han, Y., Dinh, H., Jireh, S., Buhay, C., Liu, X., Wang, Q., Ding, Y., Veeraraghavan, N., Yang, Y., Beaudet, A. L., Eng, C. M., Worley, K. C. C., Liu, Y., Hughes, D. S. T., Murali, S. C., Harris, R. A., English, A. C., Hampton, O. A., Larsen, P., Beck, C., Wang, M., Kovar, C. L., Salerno, W. J., Yoder, A., Richards, S., Rogers, J., Raveenedran, M., Xue, C., Dahdouli, M., Cox, L., Fan, G., Ferguson, B., Hovarth, J., Johnson, Z., Kanthaswamy, S., Kubisch, M., Platt, M., Smith, D., Vallender, E., Wiseman, R., Below, J., Yu, F., Lin, J., Zhang, Y., Ouyang, Z., Moore, A., Wang, Z., Hofmann, J., Purdue, M., Stolzenberg-Solomon, R., Weinstein, S., Albanes, D., Liu, C. S., Cheng, W. L., Lin, T. T., Lan, Q., Rothman, N., Berndt, S., Chen, E. S., Bahrami, H., Khoshzaban, A., Keshal, S. Heidari, Alharbi, K. K. R., Zhalbinova, M., Akilzhanova, A., Bekbosynova, M., Myrzakhmetova, S., Matar, M., Mili, N., Molinari, R., Ma, Y., Guerrier, S., Elhawary, N., Tayeb, M., Bogari, N., Qotb, N., McClymont, S. A., Hook, P. W., Goff, L. A., McCallion, A., Kong, Y., Charette, J. R., Hicks, W. L., Naggert, J. K., Zhao, L., Nishina, P. M., Edrees, B. M., Athar, M., Al-Allaf, F. A., Taher, M. M., Khan, W., Bouazzaoui, A., Harbi, N. A., Safar, R., Al-Edressi, H., Anazi, A., Altayeb, N., Ahmed, M. A., Alansary, K., Abduljaleel, Z., Kratz, A., Beguin, P., Poulain, S., Kaneko, M., Takahiko, C., Matsunaga, A., Kato, S., Bertin, N., Vigot, R., Plessy, C., Launey, T., Graur, D., Friis-Nielsen, J., Izarzugaza, J. M., Brunak, S., Chakraborty, A., Basak, J., Mukhopadhyay, A., Soibam, B. S., Das, D., Biswas, N., Das, S., Sarkar, S., Maitra, A., Panda, C., Majumder, P., Morsy, H., Gaballah, A., Samir, M., Shamseya, M., Mahrous, H., Ghazal, A., Arafat, W., Hashish, M., Gruber, J. J., Jaeger, N., Snyder, M., Patel, K., Bowman, S., Davis, T., Kraushaar, D., Emerman, A., Russello, S., Henig, N., Hendrickson, C., Zhang, K., Rodriguez-Dorantes, M., Cruz-Hernandez, C. D., Garcia-Tobilla, C. D. P., Solorzano-Rosales, S., Jäger, N., Chen, J., Haile, R., Hitchins, M., Brooks, J. D., Jiménez-Morales, S., Ramírez, M., Nuñez, J., Bekker, V., Leal, Y., Jiménez, E., Medina, A., Hidalgo, A., Mejía, J., Halytskiy, V., Naggert, J., Collin, G. B., DeMauro, K., Hanusek, R., Belhassa, K., Belhassan, K., Bouguenouch, L., Samri, I., Sayel, H., moufid, FZ., El Bouchikhi, I., Trhanint, S., Hamdaoui, H., Elotmani, I., Khtiri, I., Kettani, O., Quibibo, L., Ahagoud, M., Abbassi, M., Ouldim, K., Marusin, A. V., Kornetov, A. N., Swarovskaya, M., Vagaiceva, K., Stepanov, V., De La Paz, E. M. Cutiongco, Sy, R., Nevado, J., Reganit, P., Santos, L., Magno, J. D., Punzalan, F. E., Ona, D., Llanes, E., Santos-Cortes, R. L., Tiongco, R., Aherrera, J., Abrahan, L., Pagauitan-Alan, P., Morelli, K. H., Domire, J. S., Pyne, N., Harper, S., Burgess, R., Gari, M. A., Dallol, A., Alsehli, H., Gari, A., Gari, M., Abuzenadah, A., Thomas, M., Sukhai, M., Garg, S., Misyura, M., Zhang, T., Schuh, A., Stockley, T., Kamel-Reid, S., Sherry, S., Xiao, C., Slotta, D., Rodarmer, K., Feolo, M., Kimelman, M., Godynskiy, G., O’Sullivan, C., Yaschenko, E., Rangel-Escareño, C., Rueda-Zarate, H., Tayubi, I. A., Mohammed, R., Ahmed, I., Ahmed, T., Seth, S., Amin, S., Mao, X., Sun, H., Verhaak, R. G., Whiite, S. J., Farek, J., Kahn, Z., Kasukawa, T., Lizio, M., Harshbarger, J., Hisashi, S., Severin, J., Imad, A., Sahin, S., Freeman, T. C., Baillie, K., Shekar, S. N., Salem, A. H., Ali, M., Ibrahim, A., Ibrahim, M., Barrera, H. A., Garza, L., Torres, J. A., Barajas, V., Ulloa-Aguirre, A., Kershenobich, D., Mortaji, Shahroj, Guizar, Pedro, Loera, Eliezer, Moreno, Karen, De León, Adriana, Monsiváis, Daniela, Gómez, Jackeline, Cardiel, Raquel, Fernandez-Lopez, J. C., Bonifaz-Peña, V., Contreras, A. V., Polfus, L., Wang, X., Philip, V., Abuzenadah, A. A., Turki, R., Uyar, A., Kaygun, A., Zaman, S., Marquez, E., George, J., Hendrickson, C. L., Starr, D. B., Baird, M., Kirkpatrick, B., Sheets, K., Nitsche, R., Prieto-Lafuente, L., Landrum, M., Lee, J., Rubinstein, W., Maglott, D., Thavanati, P. K. R., de Dios, A. Escoto, Hernandez, R. E. Navarro, Aldrate, M. E. Aguilar, Mejia, M. R. Ruiz, Kanala, K. R. R., Shahzad, N., Huber, E., Dan, A., Herr, W., Sprotte, G., Köstler, J., Hiergeist, A., Gessner, A., Andreesen, R., Holler, E., Al-Allaf, F., Alashwal, A., Taher, M., Abalkhail, H., Al-Allaf, A., Bamardadh, R., Filiptsova, O., Kobets, M., Kobets, Y., Burlaka, I., Timoshyna, I., Kobets, M. N., Al-allaf, F. A., Mohiuddin, M. T., Zainularifeen, A., Mohammed, A., and Owaidah, T.

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148. Search for Magnetically Broadened Cascade Emission from Blazars with VERITAS

Author

Archambault, S., Archer, A., Benbow, W., Buchovecky, M., Bugaev, V., Cerruti, M., Connolly, M. P., Cui, W., Falcone, A., Alonso, M. Fernández, Finley, J. P., Fleischhack, H., Fortson, L., Furniss, A., Griffin, S., Huetten, Moritz, Hervet, O., Holder, J., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kieda, D., Krause, M., Krennrich, F., Lang, M. J., Lin, T. T. Y., Maier, G., McArthur, S., Moriarty, P., Nieto, D., O’Brien, S., Ong, R. A., Otte, A. N., Pohl, Martin, Popkow, A., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rovero, A. C., Sadeh, I., Shahinyan, K., Staszak, D., Telezhinsky, I., Tyler, J., Wakely, S. P., Weinstein, A., Weisgarber, T., Wilcox, P., Wilhelm, Alina, Williams, D. A., and Zitzer, B.

Subjects
13. Climate action, 7. Clean energy
Abstract

The astrophysical journal 835(2), 288 (2017). doi:10.3847/1538-4357/835/2/288, We present a search for magnetically broadened gamma-ray emission around active galactic nuclei (AGNs), using VERITAS observations of seven hard-spectrum blazars. A cascade process occurs when multi-TeV gamma-rays from an AGN interact with extragalactic background light (EBL) photons to produce electron–positron pairs, which then interact with cosmic microwave background photons via inverse-Compton scattering to produce gamma-rays. Due to the deflection of the electron–positron pairs, a non-zero intergalactic magnetic field (IGMF) would potentially produce detectable effects on the angular distribution of the cascade emission. In particular, an angular broadening compared to the unscattered emission could occur. Through non-detection of angularly broadened emission from 1ES 1218+304, the source with the largest predicted cascade fraction, we exclude a range of IGMF strengths around 10$^{−14}$ G at the 95% confidence level. The extent of the exclusion range varies with the assumptions made about the intrinsic spectrum of 1ES 1218+304 and the EBL model used in the simulation of the cascade process. All of the sources are used to set limits on the flux due to extended emission., Published by IOP Publ., Chicago, Ill. [u.a.]

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