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Start Over Author "Fu, L." Journal monthly notices of the royal astronomical society
18 results on '"Fu, L."'

3. CFHTLenS: weak lensing calibrated scaling relations for low-mass clusters of galaxies

Author

Kettula, K., primary, Giodini, S., additional, van Uitert, E., additional, Hoekstra, H., additional, Finoguenov, A., additional, Lerchster, M., additional, Erben, T., additional, Heymans, C., additional, Hildebrandt, H., additional, Kitching, T. D., additional, Mahdavi, A., additional, Mellier, Y., additional, Miller, L., additional, Mirkazemi, M., additional, Van Waerbeke, L., additional, Coupon, J., additional, Egami, E., additional, Fu, L., additional, Hudson, M. J., additional, Kneib, J. P., additional, Kuijken, K., additional, McCracken, H. J., additional, Pereira, M. J., additional, Rowe, B., additional, Schrabback, T., additional, Tanaka, M., additional, and Velander, M., additional

Published
2015
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5. The galaxy–halo connection from a joint lensing, clustering and abundance analysis in the CFHTLenS/VIPERS field

Author

Coupon, J., primary, Arnouts, S., additional, van Waerbeke, L., additional, Moutard, T., additional, Ilbert, O., additional, van Uitert, E., additional, Erben, T., additional, Garilli, B., additional, Guzzo, L., additional, Heymans, C., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Kilbinger, M., additional, Kitching, T., additional, Mellier, Y., additional, Miller, L., additional, Scodeggio, M., additional, Bonnett, C., additional, Branchini, E., additional, Davidzon, I., additional, De Lucia, G., additional, Fritz, A., additional, Fu, L., additional, Hudelot, P., additional, Hudson, M. J., additional, Kuijken, K., additional, Leauthaud, A., additional, Le Fèvre, O., additional, McCracken, H. J., additional, Moscardini, L., additional, Rowe, B. T. P., additional, Schrabback, T., additional, Semboloni, E., additional, and Velander, M., additional

Published
2015
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6. CFHTLenS: a Gaussian likelihood is a sufficient approximation for a cosmological analysis of third-order cosmic shear statistics

Author

Simon, P., primary, Semboloni, E., additional, van Waerbeke, L., additional, Hoekstra, H., additional, Erben, T., additional, Fu, L., additional, Harnois-Déraps, J., additional, Heymans, C., additional, Hildebrandt, H., additional, Kilbinger, M., additional, Kitching, T. D., additional, Miller, L., additional, and Schrabback, T., additional

Published
2015
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8. 3D cosmic shear: cosmology from CFHTLenS

Author

Kitching, T. D., primary, Heavens, A. F., additional, Alsing, J., additional, Erben, T., additional, Heymans, C., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Jaffe, A., additional, Kiessling, A., additional, Mellier, Y., additional, Miller, L., additional, van Waerbeke, L., additional, Benjamin, J., additional, Coupon, J., additional, Fu, L., additional, Hudson, M. J., additional, Kilbinger, M., additional, Kuijken, K., additional, Rowe, B. T. P., additional, Schrabback, T., additional, Semboloni, E., additional, and Velander, M., additional

Published
2014
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9. CFHTLenS: cosmological constraints from a combination of cosmic shear two-point and three-point correlations

Author

Fu, L., primary, Kilbinger, M., additional, Erben, T., additional, Heymans, C., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Kitching, T. D., additional, Mellier, Y., additional, Miller, L., additional, Semboloni, E., additional, Simon, P., additional, Van Waerbeke, L., additional, Coupon, J., additional, Harnois-Deraps, J., additional, Hudson, M. J., additional, Kuijken, K., additional, Rowe, B., additional, Schrabback, T., additional, Vafaei, S., additional, and Velander, M., additional

Published
2014
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10. CFHTLenS: mapping the large-scale structure with gravitational lensing

Author

Van Waerbeke, L., primary, Benjamin, J., additional, Erben, T., additional, Heymans, C., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Kitching, T. D., additional, Mellier, Y., additional, Miller, L., additional, Coupon, J., additional, Harnois-Déraps, J., additional, Fu, L., additional, Hudson, M., additional, Kilbinger, M., additional, Kuijken, K., additional, Rowe, B., additional, Schrabback, T., additional, Semboloni, E., additional, Vafaei, S., additional, van Uitert, E., additional, and Velander, M., additional

Published
2013
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11. CFHTLenS: the Canada–France–Hawaii Telescope Lensing Survey – imaging data and catalogue products

Author

Erben, T., primary, Hildebrandt, H., additional, Miller, L., additional, van Waerbeke, L., additional, Heymans, C., additional, Hoekstra, H., additional, Kitching, T. D., additional, Mellier, Y., additional, Benjamin, J., additional, Blake, C., additional, Bonnett, C., additional, Cordes, O., additional, Coupon, J., additional, Fu, L., additional, Gavazzi, R., additional, Gillis, B., additional, Grocutt, E., additional, Gwyn, S. D. J., additional, Holhjem, K., additional, Hudson, M. J., additional, Kilbinger, M., additional, Kuijken, K., additional, Milkeraitis, M., additional, Rowe, B. T. P., additional, Schrabback, T., additional, Semboloni, E., additional, Simon, P., additional, Smit, M., additional, Toader, O., additional, Vafaei, S., additional, van Uitert, E., additional, and Velander, M., additional

Published
2013
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12. CFHTLenS: the environmental dependence of galaxy halo masses from weak lensing

Author

Gillis, B. R., primary, Hudson, M. J., additional, Erben, T., additional, Heymans, C., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Kitching, T. D., additional, Mellier, Y., additional, Miller, L., additional, van Waerbeke, L., additional, Bonnett, C., additional, Coupon, J., additional, Fu, L., additional, Hilbert, S., additional, Rowe, B. T. P., additional, Schrabback, T., additional, Semboloni, E., additional, van Uitert, E., additional, and Velander, M., additional

Published
2013
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13. CFHTLenS: higher order galaxy–mass correlations probed by galaxy–galaxy–galaxy lensing

Author

Simon, P., primary, Erben, T., additional, Schneider, P., additional, Heymans, C., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Kitching, T. D., additional, Mellier, Y., additional, Miller, L., additional, Van Waerbeke, L., additional, Bonnett, C., additional, Coupon, J., additional, Fu, L., additional, Hudson, M. J., additional, Kuijken, K., additional, Rowe, B. T. P., additional, Schrabback, T., additional, Semboloni, E., additional, and Velander, M., additional

Published
2013
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14. Bayesian galaxy shape measurement for weak lensing surveys – III. Application to the Canada–France–Hawaii Telescope Lensing Survey

Author

Miller, L., primary, Heymans, C., additional, Kitching, T. D., additional, van Waerbeke, L., additional, Erben, T., additional, Hildebrandt, H., additional, Hoekstra, H., additional, Mellier, Y., additional, Rowe, B. T. P., additional, Coupon, J., additional, Dietrich, J. P., additional, Fu, L., additional, Harnois-Déraps, J., additional, Hudson, M. J., additional, Kilbinger, M., additional, Kuijken, K., additional, Schrabback, T., additional, Semboloni, E., additional, Vafaei, S., additional, and Velander, M., additional

Published
2013
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15. CFHTLenS: improving the quality of photometric redshifts with precision photometry★

Author

Hildebrandt, H., primary, Erben, T., additional, Kuijken, K., additional, van Waerbeke, L., additional, Heymans, C., additional, Coupon, J., additional, Benjamin, J., additional, Bonnett, C., additional, Fu, L., additional, Hoekstra, H., additional, Kitching, T. D., additional, Mellier, Y., additional, Miller, L., additional, Velander, M., additional, Hudson, M. J., additional, Rowe, B. T. P., additional, Schrabback, T., additional, Semboloni, E., additional, and Benítez, N., additional

Published
2012
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16. CFHTLenS: improving the quality of photometric redshifts with precision photometry★.

Author

Hildebrandt, H., Erben, T., Kuijken, K., van Waerbeke, L., Heymans, C., Coupon, J., Benjamin, J., Bonnett, C., Fu, L., Hoekstra, H., Kitching, T. D., Mellier, Y., Miller, L., Velander, M., Hudson, M. J., Rowe, B. T. P., Schrabback, T., Semboloni, E., and Benítez, N.

Subjects
COSMIC abundances, REDSHIFT, ASTRONOMICAL photometry, TELESCOPES, GALAXIES, CALIBRATION, ASTROPHYSICS
Abstract

ABSTRACT Here we present the results of various approaches to measure accurate colours and photometric redshifts (photo- z) from wide-field imaging data. We use data from the Canada-France-Hawaii Telescope Legacy Survey which have been re-processed by the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) team in order to carry out a number of weak gravitational lensing studies. An emphasis is put on the correction of systematic effects in the photo- z arising from the different point spread functions (PSFs) in the five optical bands. Different ways of correcting these effects are discussed and the resulting photo- z accuracies are quantified by comparing the photo- z to large spectroscopic redshift (spec- z) data sets. Careful homogenization of the PSF between bands leads to increased overall accuracy of photo- z. The gain is particularly pronounced at fainter magnitudes where galaxies are smaller and flux measurements are affected more by PSF effects. We discuss ways of defining more secure subsamples of galaxies as well as a shape- and colour-based star-galaxy separation method, and we present redshift distributions for different magnitude limits. We also study possible re-calibrations of the photometric zero-points (ZPs) with the help of galaxies with known spec- z. We find that if PSF effects are properly taken into account, a re-calibration of the ZPs becomes much less important suggesting that previous such re-calibrations described in the literature could in fact be mostly corrections for PSF effects rather than corrections for real inaccuracies in the ZPs. The implications of this finding for future surveys like the Kilo Degree Survey (KiDS), Dark Energy Survey (DES), Large Synoptic Survey Telescope or Euclid are mixed. On the one hand, ZP re-calibrations with spec- z values might not be as accurate as previously thought. On the other hand, careful PSF homogenization might provide a way out and yield accurate, homogeneous photometry without the need for full spectroscopic coverage. This is the first paper in a series describing the technical aspects of CFHTLenS. [ABSTRACT FROM AUTHOR]

Published
2012
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17. Lenses In VoicE (LIVE): searching for strong gravitational lenses in the VOICE@VST survey using convolutional neural networks

Author

Chiara Spiniello, Crescenzo Tortora, Liping Fu, Mattia Vaccari, Nicola R. Napolitano, Zuhui Fan, Giovanni Covone, Dezi Liu, R. Li, Fabrizio Gentile, Léon V. E. Koopmans, Gentile, F., Tortora, C., Covone, G., Koopmans, L. V. E., Spiniello, C., Fan, Z., Li, R., Liu, D., Napolitano, N. R., Vaccari, M., Fu, L., Kapteyn Astronomical Institute, Fabrizio Gentile, Crescenzo Tortora, Giovanni Covone, Léon V E Koopman, Chiara Spiniello, Zuhui Fan, Rui Li, Dezi Liu, Nicola R Napolitano, Mattia Vaccari, and Liping Fu

Subjects
FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Convolutional neural network, cD, law.invention, Gravitation, law, Observatory, Computer vision, galaxies: elliptical and lenticular, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, business.industry, gravitational lensing: strong, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Sample (graphics), Galaxy, Lens (optics), Space and Planetary Science, Limiting magnitude, Astrophysics of Galaxies (astro-ph.GA), galaxies: elliptical and lenticular, cD, RGB color model, Artificial intelligence, Astrophysics - Instrumentation and Methods for Astrophysics, business
Abstract

We present a sample of 16 likely strong gravitational lenses identified in the VST Optical Imaging of the CDFS and ES1 fields (VOICE survey) using Convolutional Neural Networks (CNNs). We train two different CNNs on composite images produced by superimposing simulated gravitational arcs on real Luminous Red Galaxies observed in VOICE. Specifically, the first CNN is trained on single-band images and more easily identifies systems with large Einstein radii, while the second one, trained on composite RGB images, is more accurate in retrieving systems with smaller Einstein radii. We apply both networks to real data from the VOICE survey, taking advantage of the high limiting magnitude (26.1 in the r-band) and low PSF FWHM (0.8" in the r-band) of this deep survey. We analyse $\sim21,200$ images with $mag_r, 15 pages, 12 figures, submitted to MNRAS

Published
2021

18. CFHTLenS: improving the quality of photometric redshifts with precision photometry★.

Author

Hildebrandt, H., Erben, T., Kuijken, K., van Waerbeke, L., Heymans, C., Coupon, J., Benjamin, J., Bonnett, C., Fu, L., Hoekstra, H., Kitching, T. D., Mellier, Y., Miller, L., Velander, M., Hudson, M. J., Rowe, B. T. P., Schrabback, T., Semboloni, E., and Benítez, N.

Subjects
*COSMIC abundances, *REDSHIFT, *ASTRONOMICAL photometry, *TELESCOPES, *GALAXIES, *CALIBRATION, *ASTROPHYSICS
Abstract

ABSTRACT Here we present the results of various approaches to measure accurate colours and photometric redshifts (photo- z) from wide-field imaging data. We use data from the Canada-France-Hawaii Telescope Legacy Survey which have been re-processed by the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) team in order to carry out a number of weak gravitational lensing studies. An emphasis is put on the correction of systematic effects in the photo- z arising from the different point spread functions (PSFs) in the five optical bands. Different ways of correcting these effects are discussed and the resulting photo- z accuracies are quantified by comparing the photo- z to large spectroscopic redshift (spec- z) data sets. Careful homogenization of the PSF between bands leads to increased overall accuracy of photo- z. The gain is particularly pronounced at fainter magnitudes where galaxies are smaller and flux measurements are affected more by PSF effects. We discuss ways of defining more secure subsamples of galaxies as well as a shape- and colour-based star-galaxy separation method, and we present redshift distributions for different magnitude limits. We also study possible re-calibrations of the photometric zero-points (ZPs) with the help of galaxies with known spec- z. We find that if PSF effects are properly taken into account, a re-calibration of the ZPs becomes much less important suggesting that previous such re-calibrations described in the literature could in fact be mostly corrections for PSF effects rather than corrections for real inaccuracies in the ZPs. The implications of this finding for future surveys like the Kilo Degree Survey (KiDS), Dark Energy Survey (DES), Large Synoptic Survey Telescope or Euclid are mixed. On the one hand, ZP re-calibrations with spec- z values might not be as accurate as previously thought. On the other hand, careful PSF homogenization might provide a way out and yield accurate, homogeneous photometry without the need for full spectroscopic coverage. This is the first paper in a series describing the technical aspects of CFHTLenS. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
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