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Your search keyword '"Lampeitl, H."' showing total 18 results
Start Over Author "Lampeitl, H." Publication Type Academic Journals
18 results on '"Lampeitl, H."'

1. The technical performance of the HEGRA system of imaging air Cherenkov telescopes

Author

Pühlhofer, G, Bolz, O, Götting, N, Heusler, A, Horns, D, Kohnle, A, Lampeitl, H, Panter, M, Tluczykont, M, Aharonian, F, Akhperjanian, A, Beilicke, M, Bernlöhr, K, Börst, H, Bojahr, H, Coarasa, T, Contreras, J.L, Cortina, J, Denninghoff, S, Fonseca, M.V, Girma, M, Heinzelmann, G, Hermann, G, Hofmann, W, Jung, I, Kankanyan, R, Kestel, M, Konopelko, A, Kornmeyer, H, Kranich, D, Lopez, M, Lorenz, E, Lucarelli, F, Mang, O, Meyer, H, Mirzoyan, R, Moralejo, A, Ona-Wilhelmi, E, Plyasheshnikov, A, de los Reyes, R, Rhode, W, Ripken, J, Rowell, G, Sahakian, V, Samorski, M, Schilling, M, Siems, M, Sobzynska, D, Stamm, W, Vitale, V, Völk, H.J, Wiedner, C.A, and Wittek, W

Published
2003
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3. Limits on the TeV flux of diffuse gamma rays as measured with the HEGRA air shower array

Author

Aharonian, F.A., Akhperjanian, A.G., Barrio, J.A., Bernlöhr, K., Bojahr, H., Bolz, O., Börst, H., Contreras, J.L., Cortina, J., Denninghoff, S., Fonseca, V., Gebauer, H.J., Gonzalez, J.C., Götting, N., Heinzelmann, G., Hermann, G., Heusler, A., Hofmann, W., Horns, D., Ibarra, A., Iserlohe, C., Jung, I., Kankanyan, R., Kestel, M., Kettler, J., Kohnle, A., Konopelko, A., Kornmayer, H., Kranich, D., Krawczynski, H., Lampeitl, H., Lopez, M., Lorenz, E., Lucarelli, F., Magnussen, N., Mang, O., Meyer, H., Mirzoyan, R., Moralejo, A., Oña, E., Padilla, L., Panter, M., Plaga, R., Plyasheshnikov, A., Prahl, J., Pühlhofer, G., Rauterberg, G., Rhode, W., Röhring, A., Rowell, G.P., Sahakian, V., Samorski, M., Schilling, M., Schröder, F., Siems, M., Stamm, W., Tluczykont, M., Völk, H.J., Wiedner, C., and Wittek, W.

Published
2002
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4. On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes

Author

Hofmann, W, Hermann, G, Konopelko, A, Krawczynski, H, Köhler, C, Pühlhofer, G, Aharonian, F.A, Akhperjanian, A.G, Aye, M, Barrio, J.A, Bernlöhr, K, Beteta, J.J.G, Bojahr, H, Contreras, J.L, Cortina, J, Daum, A, Deckers, T, Fernandez, J, Fonseca, V, Gonzalez, J.C, Heinzelmann, G, Hemberger, M, Heusler, A, Heß, M, Hohl, H, Holl, I, Horns, D, Jung, I, Kankanyan, R, Kestel, M, Kettler, J, Kohnle, A, Kornmayer, H, Kranich, D, Lampeitl, H, Lindner, A, Lorenz, E, Magnussen, N, Mang, O, Meyer, H, Mirzoyan, R, Moralejo, A, Padilla, L, Panter, M, Plaga, R, Prahl, J, Prosch, C, Rauterberg, G, Rhode, W, Röhring, A, Samorski, M, Sanchez, J.A, Schilling, M, Schmele, D, Schröder, F, Stamm, W, Völk, H.J, Wiebel-Sooth, B, Wiedner, C.A, and Willmer, M

Published
2000
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7. TeV γ-ray observations of the Crab and Mkn 501 during moonshine and twilight

Author

Kranich, D., Mirzoyan, R., Petry, D., Raubenheimer, B.C., Aharonian, F., Akhperjanian, A.G., Barrio, J.A., Beck, C., Bernlöhr, K., Bojahr, H., Contreras, J.L., Cortina, J., Daum, A., Deckers, T., Denninghoff, S., Fonseca, V., Gebauer, J., Gonzalez, J.C., Heinzelmann, G., Hemberger, M., Hermann, G., Hess, M., Heusler, A., Hofmann, W., Hohl, H., Horns, D., Ibarra, A., Kankanyan, R., Kestel, M., Kirstein, O., Köhler, C., Konopelko, A., Kornmayer, H., Krawczynski, H., Lampeitl, H., Lindner, A., Lorenz, E., Magnussen, N., Meyer, H., Moralejo, A., Padilla, L., Panter, M., Plaga, R., Plyasheshnikov, A., Prahl, J., Pühlhofer, G., Rauterberg, G., Renault, C., Rhode, W., Roehring, A., Sahakian, V., Samorski, M., Schmele, D., Schröder, F., Stamm, W., Völk, H., Wiebel-Sooth, B., Wiedner, C., Willmer, M., Wirth, H., and Wittek, W.

Published
1999
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8. The time structure of Cherenkov images generated by TeV γ-rays and by cosmic rays

Author

Heß, M., Bernlöhr, K., Daum, A., Hemberger, M., Hermann, G., Hofmann, W., Lampeitl, H., Aharonian, F.A., Akhperjanian, A.G., Barrio, J.A., Beteta, J.J.G., Contreras, J.L., Cortina, J., Deckers, T., Fernandez, J., Fonseca, V., Gonzalez, J.C., Heinzelmann, G., Heusler, A., Hohl, H., Holl, I., Horns, D., Kankanyan, R., Kestel, M., Kirstein, O., Köhler, C., Konopelko, A., Kornmayer, H., Kranich, D., Krawczynski, H., Lindner, A., Lorenz, E., Magnussen, N., Meyer, H., Mirzoyan, R., Moralejo, A., Padilla, L., Panter, M., Petry, D., Plaga, R., Prahl, J., Prosch, C., Pühlhofer, G., Rauterberg, G., Rhode, W., Röhring, A., Samorski, M., Sanchez, J.A., Schmele, D., Schröder, F., Stamm, W., Völk, H.J., Wiebel-Sooth, B., Wiedner, C.A., and Willmer, M.

Published
1999
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9. Performance of the stereoscopic system of the HEGRA imaging air Čerenkov telescopes: Monte Carlo simulations and observations

Author

Konopelko, A., Hemberger, M., Aharonian, F., Daum, A., Hofmann, W., Köhler, C., Krawczynski, H., Völk, H.J., Akhperjanian, A., Barrio, J., Bernlöhr, K., Bojahr, H., Contreras, J., Cortina, J., Deckers, T., Denninghoff, S., Fernandez, J., Fonseca, V., Gonzalez, J., Haustein, V., Heinzelmann, G., Hermann, G., Heß, M., Heusler, A., Hohl, H., Holl, I., Horns, D., Kankanian, R., Kestel, M., Kettler, J., Kirstein, O., Kornmayer, H., Kranich, D., Lampeitl, H., Lindner, A., Lorenz, E., Magnussen, N., Meyer, H., Mirzoyan, R., Möller, H., Moralejo, A., Padilla, L., Panter, M., Petry, D., Plaga, R., Plyasheshnikov, A., Prahl, J., Prosch, C., Pühlhofer, G., Rauterberg, G., Rhode, W., Röhring, A., Sahakian, V., Samorski, M., Sanchez, J., Schmele, D., Schroeder, F., Stamm, W., Wiebel-Sooth, B., Wiedner, C.A., Willmer, M., and Wirth, H.

Published
1999
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10. Measurement of the radial distribution of Cherenkov light generated by TeV γ-ray air showers

Author

Aharonian, F.A, Akhperjanian, A.G, Barrio, J.A, Bernlöhr, K, Bojahr, H, Contreras, J.L, Cortina, J, Daum, A, Deckers, T, Fonseca, V, Fraß, A, Gonzalez, J.C, Heinzelmann, G, Hemberger, M, Hermann, G, Heß, M, Heusler, A, Hofmann, W, Hohl, H, Holl, I, Horns, D, Ibarra, I, Kankanyan, R, Kestel, M, Kirstein, O, Köhler, C, Konopelko, A, Kornmayer, H, Kranich, D, Krawczynski, H, Lampeitl, H, Lindner, A, Lorenz, E, Magnussen, N, Meyer, H, Mirzoyan, R, Moralejo, A, Padilla, L, Panter, M, Petry, D, Plaga, R, Prahl, J, Prosch, C, Pühlhofer, G, Rauterberg, G, Rhode, W, Röhring, A, Samorski, M, Schmele, D, Schröder, F, Stamm, W, Ulrich, M, Völk, H.J, Wiebel-Sooth, B, Wiedner, C.A, Willmer, M, and Wirth, H

Published
1999
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11. Cherenkov light based measurement of extensive air showers around the knee with the HEGRA experiment

Author

Aharonian, F., Akhperjanian, A.G., Barrio, J.A., Belgarian, A.S., Bernlöhr, K., Bojahr, H., Contreras, J.L., Cortina, J., Daum, A., Deckers, T., Denninghoff, S., Fernandez, J., Fonseca, V., Gonzales, J.C., Heinzelmann, G., Hemberger, M., Hermann, G., Hess, M., Heusler, A., Hofmann, W., Hohl, H., Horns, D., Kankanyan, R., Kestel, M., Kirstein, O., Köhler, C., Konopelko, A., Kornmayer, H., Kranich, D., Krawczynski, H., Lampeitl, H., Lindner, A., Lorenz, E., Magnussen, N., Meyer, H., Mirzoyan, R., Moralejo, A., Padilla, L., Panter, M., Petry, D., Plaga, R., Plyasheshnikov, A., Prahl, J., Prosch, C., Pühlhofer, G., Rauterberg, G., Renault, C., Rhode, W., Röhring, A., Sahakian, V., Samorski, M., Schmele, D., Schröder, F., Stamm, W., Völk, H.J., and Wiebel-Sooth, B.

Published
1999
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12. Statistical classification techniques for photometric supernova typing.

Author

Newling, J., Varughese, M., Bassett, B., Campbell, H., Hlozek, R., Kunz, M., Lampeitl, H., Martin, B., Nichol, R., Parkinson, D., and Smith, M.

Subjects
SUPERNOVAE, ASTRONOMICAL photometry, SPECTRUM analysis, CLASSIFICATION, LIGHT curves, STATISTICS, REDSHIFT
Abstract

Future photometric supernova surveys will produce vastly more candidates than can be followed up spectroscopically, highlighting the need for effective classification methods based on light curves alone. Here we introduce boosting and kernel density estimation techniques which have minimal astrophysical input, and compare their performance on 20 000 simulated Dark Energy Survey light curves. We demonstrate that these methods perform very well provided a representative sample of the full population is used for training. Interestingly, we find that they do not require the redshift of the host galaxy or candidate supernova. However, training on the types of spectroscopic subsamples currently produced by supernova surveys leads to poor performance due to the resulting bias in training, and we recommend that special attention be given to the creation of representative training samples. We show that given a typical non-representative training sample, S, one can expect to pull out a representative subsample of about 10 per cent of the size of S, which is large enough to outperform the methods trained on all of S. [ABSTRACT FROM AUTHOR]

Published
2011
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13. EVIDENCE FOR A CORRELATION BETWEEN THE Si II λ4000 WIDTH AND TYPE Ia SUPERNOVA COLOR.

Author

NORDIN, J., OSTMAN, L., GOOBAR, A., BALLAND, C., LAMPEITL, H., NICHOL, R. C., SAKO, M., SCHNEIDER, D. P., SMITH, M., SOLLERMAN, J., and WHEELER, J. C.

Subjects
STATISTICAL correlation, TYPE I supernovae, REDSHIFT, LIGHT curves, SURVEYS, COSMOLOGICAL distances
Abstract

We study the pseudo-equivalent width of the Si II λ4000 feature of Type Ta supernovae (SNe Ta) in the redshift range 0.0024 ⩽ z ⩽ 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si II λ6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si II λ4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia. [ABSTRACT FROM AUTHOR]

Published
2011
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14. First-year Sloan Digital Sky Survey-II supernova results: consistency and constraints with other intermediate-redshift data sets.

Author

Lampeitl, H., Nichol, R. C., Seo, H.-J., Giannantonio, T., Shapiro, C., Bassett, B., Percival, W. J., Davis, T. M., Dilday, B., Frieman, J., Garnavich, P., Sako, M., Smith, M., Sollerman, J., Becker, A.C., Cinabro, D., Filippenko, A. V., Foley, R. J., Hogan, C. J., and Holtzman, J. A.

Subjects
*SURVEYS, *TYPE I supernovae, *REDSHIFT, *METAPHYSICAL cosmology, *INTERSTELLAR medium
Abstract

We present an analysis of the luminosity distances of Type Ia Supernovae (SNe) from the Sloan Digital Sky Survey-II (SDSS-II) SN Survey in conjunction with other intermediate-redshift cosmological measurements including redshift-space distortions from the Two-Degree Field Galaxy Redshift Survey (2dFGRS), the integrated Sachs–Wolfe (ISW) effect seen by the SDSS and the latest baryon acoustic oscillation (BAO) distance scale from both the SDSS and 2dFGRS. We have analysed the SDSS-II SN data alone using a variety of ‘model-independent’ methods and find evidence for an accelerating Universe at a >97 per cent level from this single data set. We find good agreement between the SN and BAO distance measurements, both consistent with a Λ-dominated cold dark matter cosmology, as demonstrated through an analysis of the distance duality relationship between the luminosity ( dL) and angular diameter ( dA) distance measures. We then use these data to estimate w within this restricted redshift range . Our most stringent result comes from the combination of all our intermediate-redshift data (SDSS-II SNe, BAO, ISW and redshift-space distortions), giving and assuming a flat universe. This value of w and associated errors only change slightly if curvature is allowed to vary, consistent with constraints from the cosmic microwave background. We also consider more limited combinations of the geometrical (SN, BAO) and dynamical (ISW, redshift-space distortions) probes. [ABSTRACT FROM AUTHOR]

Published
2010
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16. The Sloan Digital Sky Survey monitor telescope pipeline

Author

Tucker, D.L., Kent, S., Richmond, M.W., Annis, J., Smith, J.A., Allam, S.S., Rodgers, C.T., Stute, J.L., Adelman-McCarthy, J.K., Brinkmann, J., Doi, M., Finkbeiner, Douglas, Fukugita, M., Goldston, J., Greenway, B., Gunn, J.E., Hendry, J.S., Hogg, D.W., Ichikawa, S.-I., Ivezić, Ž., Knapp, G.R., Lampeitl, H., Lee, B.C., Lin, H., McKay, T.A., Merrelli, A., Munn, J.A., Neilsen, E.H., Newberg, H.J., Richards, G.T., Schlegel, D.J., Stoughton, C., Uomoto, A., and Yanny, B.

Subjects
methods: data analysis, techniques: image processing, techniques: photometric, surveys
Abstract

The photometric calibration of the Sloan Digital Sky Survey (SDSS) is a multi-step process which involves data from three different telescopes: the 1.0-m telescope at the US Naval Observatory (USNO), Flagstaff Station, Arizona (which was used to establish the SDSS standard star network); the SDSS 0.5-m Photometric Telescope (PT) at the Apache Point Observatory (APO), New Mexico (which calculates nightly extinctions and calibrates secondary patch transfer fields); and the SDSS 2.5-m telescope at APO (which obtains the imaging data for the SDSS proper). In this paper, we describe the Monitor Telescope Pipeline, MTPIPE, the software pipeline used in processing the data from the single-CCD telescopes used in the photometric calibration of the SDSS (i.e., the USNO 1.0-m and the PT). We also describe transformation equations that convert photometry on the USNO-1.0m u'g'r'i'z' system to photometry the SDSS 2.5m ugriz system and the results of various validation tests of the MTPIPE software. Further, we discuss the semi-automated PT factory, which runs MTPIPE in the day-to-day standard SDSS operations at Fermilab. Finally, we discuss the use of MTPIPE in current SDSS-related projects, including the Southern u'g'r'i'z' Standard Star project, the u'g'r'i'z' Open Star Clusters project, and the SDSS extension (SDSS-II)., Astronomy

Published
2006
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18. First results on the performance of the HEGRA IACT array

Author

Daum, A., Hermann, G., Heß, M., Hofmann, W., Lampeitl, H., Pühlhofer, G., Aharonian, F., Akhperjanian, A.G., Barrio, J.A., Beglarian, A.S., Bernlöhr, K., Beteta, J.J.G., Bradbury, S.M., Contreras, J.L., Cortina, J., Deckers, T., Feigl, E., Fernandez, J., Fonseca, V., Fraß, A., Funk, B., Gonzalez, J.C., Heinzelmann, G., Hemberger, M., Heusler, A., Holl, I., Horns, D., Kankanyan, R., Kirstein, O., Köhler, C., Konopelko, A., Kranich, D., Krawczynski, H., Kornmayer, H., Lindner, A., Lorenz, E., Magnussen, N., Meyer, H., Mirzoyan, R., Möller, H., Moralejo, A., Padilla, L., Panter, M., Petry, D., Plaga, R., Prahl, J., Prosch, C., Rauterberg, G., Rhode, W., Röhring, A., Sahakian, V., Samorski, M., Sanchez, J.A., Schmele, D., Stamm, W., Ulrich, M., Völk, H.J., Westerhoff, S., Wiebel-Sooth, B., Wiedner, C.A., Willmer, M., and Wirth, H.

Published
1997
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