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Your search keyword '"Armstrong, R. P."' showing total 7 results
Start Over Author "Armstrong, R. P." Publisher escholarship, university of california
7 results on '"Armstrong, R. P."'

1. Evidence for the Cross-correlation between Cosmic Microwave Background Polarization Lensing from Polarbear and Cosmic Shear from Subaru Hyper Suprime-Cam

Author

Namikawa, T, Chinone, Y, Miyatake, H, Oguri, M, Takahashi, R, Kusaka, A, Katayama, N, Adachi, S, Aguilar, M, Aihara, H, Ali, A, Armstrong, R, Arnold, K, Baccigalupi, C, Barron, D, Beck, D, Beckman, S, Bianchini, F, Boettger, D, Borrill, J, Cheung, K, Corbett, L, Crowley, KT, Bouhargani, H El, Elleflot, T, Errard, J, Fabbian, G, Feng, C, Galitzki, N, Goeckner-Wald, N, Groh, J, Hamada, T, Hasegawa, M, Hazumi, M, Hill, CA, Howe, L, Jeong, O, Kaneko, D, Keating, B, Lee, AT, Leon, D, Linder, E, Lowry, LN, Mangu, A, Matsuda, F, Minami, Y, Miyazaki, S, Murayama, H, Navaroli, M, Nishino, H, Nishizawa, AJ, Pham, ATP, Poletti, D, Puglisi, G, Reichardt, CL, Sherwin, BD, Silva-Feaver, M, Siritanasak, P, Speagle, JS, Stompor, R, Suzuki, A, Tait, PJ, Tajima, O, Takada, M, Takakura, S, Takatori, S, Tanabe, D, Tanaka, M, Teply, GP, Tsai, C, Vergés, C, Westbrook, B, and Zhou, Y

Subjects
Particle and High Energy Physics, Physical Sciences, cosmic background radiation, cosmology: observations, gravitational lensing: weak, polarization, astro-ph.CO, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract

We present the first measurement of cross-correlation between the lensing potential, reconstructed from cosmic microwave background (CMB) polarization data, and the cosmic shear field from galaxy shapes. This measurement is made using data from the Polarbear CMB experiment and the Subaru Hyper Suprime-Cam (HSC) survey. By analyzing an 11 deg2 overlapping region, we reject the null hypothesis at 3.5σ and constrain the amplitude of the cross-spectrum to , where is the amplitude normalized with respect to the Planck 2018 prediction, based on the flat Λ cold dark matter cosmology. The first measurement of this cross-spectrum without relying on CMB temperature measurements is possible owing to the deep Polarbear map with a noise level of ∼6 μK arcmin, as well as the deep HSC data with a high galaxy number density of . We present a detailed study of the systematics budget to show that residual systematics in our results are negligibly small, which demonstrates the future potential of this cross-correlation technique.

Published
2019

2. LSST: From Science Drivers to Reference Design and Anticipated Data Products

Author

Ivezić, Ž, Kahn, SM, Tyson, JA, Abel, B, Acosta, E, Allsman, R, Alonso, D, Alsayyad, Y, Anderson, SF, Andrew, J, Angel, JRP, Angeli, GZ, Ansari, R, Antilogus, P, Araujo, C, Armstrong, R, Arndt, KT, Astier, P, Aubourg, E, Auza, N, Axelrod, TS, Bard, DJ, Barr, JD, Barrau, A, Bartlett, JG, Bauer, AE, Bauman, BJ, Baumont, S, Bechtol, E, Bechtol, K, Becker, AC, Becla, J, Beldica, C, Bellavia, S, Bianco, FB, Biswas, R, Blanc, G, Blazek, J, Blandford, RD, Bloom, JS, Bogart, J, Bond, TW, Booth, MT, Borgland, AW, Borne, K, Bosch, JF, Boutigny, D, Brackett, CA, Bradshaw, A, Brandt, WN, Brown, ME, Bullock, JS, Burchat, P, Burke, DL, Cagnoli, G, Calabrese, D, Callahan, S, Callen, AL, Carlin, JL, Carlson, EL, Chandrasekharan, S, Charles-Emerson, G, Chesley, S, Cheu, EC, Chiang, HF, Chiang, J, Chirino, C, Chow, D, Ciardi, DR, Claver, CF, Cohen-Tanugi, J, Cockrum, JJ, Coles, R, Connolly, AJ, Cook, KH, Cooray, A, Covey, KR, Cribbs, C, Cui, W, Cutri, R, Daly, PN, Daniel, SF, Daruich, F, Daubard, G, Daues, G, Dawson, W, Delgado, F, Dellapenna, A, Peyster, RD, Val-Borro, MD, Digel, SW, Doherty, P, Dubois, R, Dubois-Felsmann, GP, Durech, J, Economou, F, Eifler, T, Eracleous, M, Emmons, BL, and Neto, AF

Subjects
astrometry, cosmology: observations, Galaxy: general, methods: observational, stars: general, surveys, astro-ph, Astronomical and Space Sciences, Organic Chemistry, Physical Chemistry, Astronomy & Astrophysics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural)
Abstract

We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). The LSST design is driven by four main science themes: probing dark energy and dark matter, taking an inventory of the solar system, exploring the transient optical sky, and mapping the Milky Way. LSST will be a large, wide-field ground-based system designed to obtain repeated images covering the sky visible from Cerro Pachón in northern Chile. The telescope will have an 8.4 m (6.5 m effective) primary mirror, a 9.6 deg 2 field of view, a 3.2-gigapixel camera, and six filters (ugrizy) covering the wavelength range 320-1050 nm. The project is in the construction phase and will begin regular survey operations by 2022. About 90% of the observing time will be devoted to a deep-wide-fast survey mode that will uniformly observe a 18,000 deg 2 region about 800 times (summed over all six bands) during the anticipated 10 yr of operations and will yield a co-added map to r ∼27.5. These data will result in databases including about 32 trillion observations of 20 billion galaxies and a similar number of stars, and they will serve the majority of the primary science programs. The remaining 10% of the observing time will be allocated to special projects such as Very Deep and Very Fast time domain surveys, whose details are currently under discussion. We illustrate how the LSST science drivers led to these choices of system parameters, and we describe the expected data products and their characteristics.

Published
2019

3. Redshift distributions of galaxies in the Dark Energy Survey Science Verification shear catalogue and implications for weak lensing

Author

Bonnett, C, Troxel, MA, Hartley, W, Amara, A, Leistedt, B, Becker, MR, Bernstein, GM, Bridle, SL, Bruderer, C, Busha, MT, Carrasco Kind, M, Childress, MJ, Castander, FJ, Chang, C, Crocce, M, Davis, TM, Eifler, TF, Frieman, J, Gangkofner, C, Gaztanaga, E, Glazebrook, K, Gruen, D, Kacprzak, T, King, A, Kwan, J, Lahav, O, Lewis, G, Lidman, C, Lin, H, MacCrann, N, Miquel, R, O'Neill, CR, Palmese, A, Peiris, HV, Refregier, A, Rozo, E, Rykoff, ES, Sadeh, I, Sánchez, C, Sheldon, E, Uddin, S, Wechsler, RH, Zuntz, J, Abbott, T, Abdalla, FB, Allam, S, Armstrong, R, Banerji, M, Bauer, AH, Benoit-Lévy, A, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Capozzi, D, Carnero Rosell, A, Carretero, J, Cunha, CE, D'Andrea, CB, Da Costa, LN, Depoy, DL, Desai, S, Diehl, HT, Dietrich, JP, Doel, P, Fausti Neto, A, Fernandez, E, Flaugher, B, Fosalba, P, Gerdes, DW, Gruendl, RA, Honscheid, K, Jain, B, James, DJ, Jarvis, M, Kim, AG, Kuehn, K, Kuropatkin, N, Li, TS, Lima, M, Maia, MAG, March, M, Marshall, JL, Martini, P, Melchior, P, Miller, CJ, Neilsen, E, Nichol, RC, Nord, B, Ogando, R, Plazas, AA, Reil, K, Romer, AK, Roodman, A, Sako, M, Sanchez, E, Santiago, B, Smith, RC, Soares-Santos, M, and Sobreira, F

Subjects
astro-ph.CO
Abstract

We present photometric redshift estimates for galaxies used in the weak lensing analysis of the Dark Energy Survey Science Verification (DES SV) data. Four model- or machine learning-based photometric redshift methods - annz2, bpz calibrated against BCC-Ufig simulations, skynet, and tpz - are analyzed. For training, calibration, and testing of these methods, we construct a catalogue of spectroscopically confirmed galaxies matched against DES SV data. The performance of the methods is evaluated against the matched spectroscopic catalogue, focusing on metrics relevant for weak lensing analyses, with additional validation against COSMOS photo-z's. From the galaxies in the DES SV shear catalogue, which have mean redshift 0.72±0.01 over the range 0.3

Published
2016

4. A DECAM SEARCH FOR AN OPTICAL COUNTERPART TO THE LIGO GRAVITATIONAL-WAVE EVENT GW151226

Author

Cowperthwaite, PS, Berger, E, Soares-Santos, M, Annis, J, Brout, D, Brown, DA, Buckley-Geer, E, Cenko, SB, Chen, HY, Chornock, R, Diehl, HT, Doctor, Z, Drlica-Wagner, A, Drout, MR, Farr, B, Finley, DA, Foley, RJ, Fong, W, Fox, DB, Frieman, J, Garcia-Bellido, J, Gill, MSS, Gruendl, RA, Herner, K, Holz, DE, Kasen, D, Kessler, R, Lin, H, Margutti, R, Marriner, J, Matheson, T, Metzger, BD, Neilsen, EH, Quataert, E, Rest, A, Sako, M, Scolnic, D, Smith, N, Sobreira, F, Strampelli, GM, Villar, VA, Walker, AR, Wester, W, Williams, PKG, Yanny, B, Abbott, TMC, Abdalla, FB, Allam, S, Armstrong, R, Bechtol, K, Benoit-Lévy, A, Bertin, E, Brooks, D, Burke, DL, Rosell, A Carnero, Kind, M Carrasco, Carretero, J, Castander, FJ, Cunha, CE, D’Andrea, CB, da Costa, LN, Desai, S, Dietrich, JP, Evrard, AE, Neto, A Fausti, Fosalba, P, Gerdes, DW, Giannantonio, T, Goldstein, DA, Gruen, D, Gutierrez, G, Honscheid, K, James, DJ, Johnson, MWG, Johnson, MD, Krause, E, Kuehn, K, Kuropatkin, N, Lima, M, Maia, MAG, Marshall, JL, Menanteau, F, Miquel, R, Mohr, JJ, Nichol, RC, Nord, B, Ogando, R, Plazas, AA, Reil, K, Romer, AK, Sanchez, E, Scarpine, V, Sevilla-Noarbe, I, Smith, RC, Suchyta, E, Tarle, G, Thomas, D, Thomas, RC, Tucker, DL, and Weller, J

Subjects
binaries: close, catalogs, gravitational waves, stars: neutron, surveys, astro-ph.HE, astro-ph.CO, Astronomical and Space Sciences, Astronomy & Astrophysics
Abstract

We report the results of a Dark Energy Camera optical follow-up of the gravitational-wave (GW) event GW151226, discovered by the Advanced Laser Interferometer Gravitational-wave Observatory detectors. Our observations cover 28.8 deg2 of the localization region in the i and z bands (containing 3% of the BAYESTAR localization probability), starting 10 hr after the event was announced and spanning four epochs at 2-24 days after the GW detection. We achieve point-source limiting magnitudes of and , with a scatter of 0.4 mag, in our difference images. Given the two-day delay, we search this area for a rapidly declining optical counterpart with significance steady decline between the first and final observations. We recover four sources that pass our selection criteria, of which three are cataloged active galactic nuclei. The fourth source is offset by 5.8 arcsec from the center of a galaxy at a distance of 187 Mpc, exhibits a rapid decline by 0.5 mag over 4 days, and has a red color of mag. These properties could satisfy a set of cuts designed to identify kilonovae. However, this source was detected several times, starting 94 days prior to GW151226, in the Pan-STARRS Survey for Transients (dubbed as PS15cdi) and is therefore unrelated to the GW event. Given its long-term behavior, PS15cdi is likely a Type IIP supernova that transitioned out of its plateau phase during our observations, mimicking a kilonova-like behavior. We comment on the implications of this detection for contamination in future optical follow-up observations.

Published
2016

5. Cosmology from cosmic shear with Dark Energy Survey Science Verification data

Author

Abbott, T, Abdalla, FB, Allam, S, Amara, A, Annis, J, Armstrong, R, Bacon, D, Banerji, M, Bauer, AH, Baxter, E, Becker, MR, Benoit-Lévy, A, Bernstein, RA, Bernstein, GM, Bertin, E, Blazek, J, Bonnett, C, Bridle, SL, Brooks, D, Bruderer, C, Buckley-Geer, E, Burke, DL, Busha, MT, Capozzi, D, Rosell, A Carnero, Kind, M Carrasco, Carretero, J, Castander, FJ, Chang, C, Clampitt, J, Crocce, M, Cunha, CE, D’Andrea, CB, da Costa, LN, Das, R, DePoy, DL, Desai, S, Diehl, HT, Dietrich, JP, Dodelson, S, Doel, P, Drlica-Wagner, A, Efstathiou, G, Eifler, TF, Erickson, B, Estrada, J, Evrard, AE, Neto, A Fausti, Fernandez, E, Finley, DA, Flaugher, B, Fosalba, P, Friedrich, O, Frieman, J, Gangkofner, C, Garcia-Bellido, J, Gaztanaga, E, Gerdes, DW, Gruen, D, Gruendl, RA, Gutierrez, G, Hartley, W, Hirsch, M, Honscheid, K, Huff, EM, Jain, B, James, DJ, Jarvis, M, Kacprzak, T, Kent, S, Kirk, D, Krause, E, Kravtsov, A, Kuehn, K, Kuropatkin, N, Kwan, J, Lahav, O, Leistedt, B, Li, TS, Lima, M, Lin, H, MacCrann, N, March, M, Marshall, JL, Martini, P, McMahon, RG, Melchior, P, Miller, CJ, Miquel, R, Mohr, JJ, Neilsen, E, Nichol, RC, Nicola, A, Nord, B, Ogando, R, Palmese, A, Peiris, HV, Plazas, AA, Refregier, A, and Roe, N

Subjects
Particle and High Energy Physics, Physical Sciences, astro-ph.CO, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

We present the first constraints on cosmology from the Dark Energy Survey (DES), using weak lensing measurements from the preliminary Science Verification (SV) data. We use 139 square degrees of SV data, which is less than 3% of the full DES survey area. Using cosmic shear 2-point measurements over three redshift bins we find σ8(Ωm/0.3)0.5=0.81±0.06 (68% confidence), after marginalizing over 7 systematics parameters and 3 other cosmological parameters. We examine the robustness of our results to the choice of data vector and systematics assumed, and find them to be stable. About 20% of our error bar comes from marginalizing over shear and photometric redshift calibration uncertainties. The current state-of-the-art cosmic shear measurements from CFHTLenS are mildly discrepant with the cosmological constraints from Planck CMB data; our results are consistent with both data sets. Our uncertainties are ∼30% larger than those from CFHTLenS when we carry out a comparable analysis of the two data sets, which we attribute largely to the lower number density of our shear catalogue. We investigate constraints on dark energy and find that, with this small fraction of the full survey, the DES SV constraints make negligible impact on the Planck constraints. The moderate disagreement between the CFHTLenS and Planck values of σ8(Ωm/0.3)0.5 is present regardless of the value of w.

Published
2016

6. A DARK ENERGY CAMERA SEARCH FOR AN OPTICAL COUNTERPART TO THE FIRST ADVANCED LIGO GRAVITATIONAL WAVE EVENT GW150914

Author

Soares-Santos, M, Kessler, R, Berger, E, Annis, J, Brout, D, Buckley-Geer, E, Chen, H, Cowperthwaite, PS, Diehl, HT, Doctor, Z, Drlica-Wagner, A, Farr, B, Finley, DA, Flaugher, B, Foley, RJ, Frieman, J, Gruendl, RA, Herner, K, Holz, D, Lin, H, Marriner, J, Neilsen, E, Rest, A, Sako, M, Scolnic, D, Sobreira, F, Walker, AR, Wester, W, Yanny, B, Abbott, TMC, Abdalla, FB, Allam, S, Armstrong, R, Banerji, M, Benoit-Levy, A, Bernstein, RA, Bertin, E, Brown, DA, Burke, DL, Capozzi, D, Carnero Rosell, A, Carrasco Kind, M, Carretero, J, Castander, FJ, Cenko, SB, Chornock, R, Crocce, M, D'Andrea, CB, da Costa, LN, Desai, S, Dietrich, JP, Drout, MR, Eifler, TF, Estrada, J, Evrard, AE, Fairhurst, S, Fernandez, E, Fischer, J, Fong, W, Fosalba, P, Fox, DB, Fryer, CL, Garcia-Bellido, J, Gaztanaga, E, Gerdes, DW, Goldstein, DA, Gruen, D, Gutierrez, G, Honscheid, K, James, DJ, Karliner, I, Kasen, D, Kent, S, Kuropatkin, N, Kuehn, K, Lahav, O, Li, TS, Lima, M, Maia, MAG, Margutti, R, Martini, P, Matheson, T, McMahon, RG, Metzger, BD, Miller, CJ, Miquel, R, Mohr, JJ, Nichol, RC, Nord, B, Ogando, R, Peoples, J, Plazas, AA, Quataert, E, Romer, AK, Roodman, A, Rykoff, ES, Sanchez, E, Scarpine, V, Schindler, R, and Schubnell, M

Subjects
binaries: close, catalogs, gravitational waves, stars: neutron, surveys, Astronomy & Astrophysics, Astronomical and Space Sciences
Published
2016

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