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550 results on '"Davé, R"'

209. The TAOS Project: High-Speed Crowded Field Aperture Photometry

Author

Zhang, Z.-W., Kim, D.-W., Wang, J.-H., Lehner, M. J., Chen, W. P., Byun, Y.-I., Alcock, C., Axelrod, T., Bianco, F. B., Coehlo, N. K., Cook, K. H., Dave, R., de Pater, I., Giammarco, J., King, S.-K., Lee, T., Lin, H.-C., Marshall, S. L., Porrata, R., Protopapas, P., Rice, J. A., Schwamb, M. E., Wang, S.-Y., and Wen, C.-Y.

Published
2009
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210. Enhancing Project Management for Periodic Data Production Management

Author

Schanzenberger, Anja, Lawrence, Dave R., Kirsche, Thomas, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Meersman, Robert, editor, Tari, Zahir, editor, and Herrero, Pilar, editor

Published
2005
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216. Looking at the Distant Universe with the MeerKAT Array: Discovery of a Luminous OH Megamaser at z > 0.5

Author

Hess, K.M., Somerville, R.S., Oosterloo, T., Skelton, R., Glowacki, M., Wu, J.F., Srianand, R., Verheijen, M., Roberts, H., Vaccari, M., Bowler, R., Crawford, S.M., Korsaga, M., Baker, A.J., Randriamiarinarivo, N., Pisano, D.J., Duncan, K., Jarvis, M., Hughes, J.P., Adams, N., Frank, B., February, S., Blyth, S.-L., Cress, C., Ravindranath, S., Makhathini, S., Meyer, M., Lochner, M., Staveley-Smith, L., Hatfield, P., Smirnov, O., Davé, R., Kazemi-Moridani, A., Kannappan, S., Walter, F., Heywood, I., Zwaan, M.A., De Blok, E., Oh, S.-H., Kereš, D., Kraan-Korteweg, R.C., Oppor, J., Bershady, M., Chemin, L., Smith, M., Holwerda, B.W., Tanaka, M., Lah, P., Klöckner, H.-R., Van Driel, W., Healy, J., Elson, E., Blecher, T., Catinella, B., Schröder, A.C., Hoosain, M., Pan, H., Katz, N., Delhaize, J., Darling, J., Hutchens, Z.L., Gawiser, E., Henning, P., Meurer, G.R., Obreschkow, D., Deane, R., Maddox, N., and Collier, J.D.

Abstract

In the local universe, OH megamasers (OHMs) are detected almost exclusively in infrared-luminous galaxies, with a prevalence that increases with IR luminosity, suggesting that they trace gas-rich galaxy mergers. Given the proximity of the rest frequencies of OH and the hyperfine transition of neutral atomic hydrogen (H i), radio surveys to probe the cosmic evolution of H i in galaxies also offer exciting prospects for exploiting OHMs to probe the cosmic history of gas-rich mergers. Using observations for the Looking At the Distant Universe with the MeerKAT Array (LADUMA) deep H i survey, we report the first untargeted detection of an OHM at z > 0.5, LADUMA J033046.20-275518.1 (nicknamed "Nkalakatha"). The host system, WISEA J033046.26-275518.3, is an infrared-luminous radio galaxy whose optical redshift z ≈ 0.52 confirms the MeerKAT emission-line detection as OH at a redshift z OH = 0.5225 ± 0.0001 rather than H i at lower redshift. The detected spectral line has 18.4σ peak significance, a width of 459 ± 59 km s-1, and an integrated luminosity of (6.31 ± 0.18 [statistical] ± 0.31 [systematic]) × 103 L ⊙, placing it among the most luminous OHMs known. The galaxy's far-infrared luminosity L FIR = (1.576 ±0.013) × 1012 L ⊙ marks it as an ultraluminous infrared galaxy; its ratio of OH and infrared luminosities is similar to those for lower-redshift OHMs. A comparison between optical and OH redshifts offers a slight indication of an OH outflow. This detection represents the first step toward a systematic exploitation of OHMs as a tracer of galaxy growth at high redshifts.

Published
2022
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218. MIGHTEE: deep 1.4 GHz source counts and the sky temperature contribution of star-forming galaxies and active galactic nuclei.

Author

Hale, C L, Whittam, I H, Jarvis, M J, Best, P N, Thomas, N L, Heywood, I, Prescott, M, Adams, N, Afonso, J, An, Fangxia, Bowler, R A A, Collier, J D, Cook, R H W, Davé, R, Frank, B S, Glowacki, M, Hatfield, P W, Kolwa, S, Lovell, C C, and Maddox, N

Subjects
ACTIVE galactic nuclei, ACTIVE galaxies, DATA release, SKY
Abstract

We present deep 1.4 GHz source counts from ∼5 deg2 of the continuum Early Science data release of the MeerKAT International Gigahertz Tiered Extragalactic Exploration survey down to S 1.4GHz ∼15 |$\mu$| Jy. Using observations over two extragalactic fields (COSMOS and XMM-LSS), we provide a comprehensive investigation into correcting the incompleteness of the raw source counts within the survey to understand the true underlying source count population. We use a variety of simulations that account for: errors in source detection and characterization, clustering, and variations in the assumed source model used to simulate sources within the field and characterize source count incompleteness. We present these deep source count distributions and use them to investigate the contribution of extragalactic sources to the sky background temperature at 1.4 GHz using a relatively large sky area. We then use the wealth of ancillary data covering a subset of the COSMOS field to investigate the specific contributions from both active galactic nuclei (AGN) and star-forming galaxies (SFGs) to the source counts and sky background temperature. We find, similar to previous deep studies, that we are unable to reconcile the sky temperature observed by the ARCADE 2 experiment. We show that AGN provide the majority contribution to the sky temperature contribution from radio sources, but the relative contribution of SFGs rises sharply below 1 mJy, reaching an approximate 15–25 per cent contribution to the total sky background temperature (Tb ∼100 mK) at ∼15 |$\mu$| Jy. [ABSTRACT FROM AUTHOR]

Published
2023
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237. NAD+ Repletion Rescues Female Fertility during Reproductive Aging

Author

Bertoldo, Michael J., Listijono, Dave R., Ho, Wing-Hong Jonathan, Riepsamen, Angelique H., Goss, Dale M., Richani, Dulama, Jin, Xing L., Mahbub, Saabah, Campbell, Jared M., Habibalahi, Abbas, Loh, Wei-Guo Nicholas, Youngson, Neil A., Maniam, Jayanthi, Wong, Ashley S.A., Selesniemi, Kaisa, Bustamante, Sonia, Li, Catherine, Zhao, Yiqing, Marinova, Maria B., Kim, Lynn-Jee, Lau, Laurin, Wu, Rachael M., Mikolaizak, A. Stefanie, Araki, Toshiyuki, Le Couteur, David G., Turner, Nigel, Morris, Margaret J., Walters, Kirsty A., Goldys, Ewa, O’Neill, Christopher, Gilchrist, Robert B., Sinclair, David A., Homer, Hayden A., and Wu, Lindsay E.

Published
2020
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238. orientation bias in observations of submillimetre galaxies.

Author

Lovell, C C, Geach, J E, Davé, R, Narayanan, D, Coppin, K E K, Li, Q, Franco, M, and Privon, G C

Subjects
SUBMILLIMETER astronomy, GALAXIES, MONTE Carlo method, ACTINIC flux, STAR formation, STELLAR mass
Abstract

Recent high-resolution interferometric images of submillimetre galaxies (SMGs) reveal fascinatingly complex morphologies. This raises a number of questions: how does the relative orientation of a galaxy affect its observed submillimetre emission, and does this result in an 'orientation bias' in the selection and analysis of such galaxies in flux-limited cosmological surveys? We investigated these questions using the simba cosmological simulation paired with the dust radiative transfer code powderday. We selected eight simulated SMGs (S 850 ≳ 2 mJy) at z  = 2, and measured the variance of their 'observed' emission over 50 random orientations. Each galaxy exhibits significant scatter in its emission close to the peak of the thermal dust emission, with variation in flux density of up to a factor of 2.7. This results in an appreciable dispersion in the inferred dust temperatures and infrared luminosities (16th–84th percentile ranges of 5 K and 0.1 dex, respectively) and therefore a fundamental uncertainty in derived parameters such as dust mass and star formation rate (∼30 per cent for the latter using simple calibrations). Using a Monte Carlo simulation we also assessed the impact of orientation on flux-limited surveys, finding a bias in the selection of SMGs towards those with face-on orientations, as well as those at lower redshifts. We predict that the orientation bias will affect flux-limited single-dish surveys, most significantly at THz frequencies, and this bias should be taken into account when placing the results of targeted follow-up studies in a statistical context. [ABSTRACT FROM AUTHOR]

Published
2022
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241. MIGHTEE-HI: The H I emission project of the MeerKAT MIGHTEE survey

Author

Maddox, N., primary, Frank, B. S., additional, Ponomareva, A. A., additional, Jarvis, M. J., additional, Adams, E. A. K., additional, Davé, R., additional, Oosterloo, T. A., additional, Santos, M. G., additional, Blyth, S. L., additional, Glowacki, M., additional, Kraan-Korteweg, R. C., additional, Mulaudzi, W., additional, Namumba, B., additional, Prandoni, I., additional, Rajohnson, S. H. A., additional, Spekkens, K., additional, Adams, N. J., additional, Bowler, R. A. A., additional, Collier, J. D., additional, Heywood, I., additional, Sekhar, S., additional, and Taylor, A. R., additional

Published
2021
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246. In pursuit of giants

Author

Donevski, D., primary, Lapi, A., additional, Małek, K., additional, Liu, D., additional, Gómez-Guijarro, C., additional, Davé, R., additional, Kraljic, K., additional, Pantoni, L., additional, Man, A., additional, Fujimoto, S., additional, Feltre, A., additional, Pearson, W., additional, Li, Q., additional, and Narayanan, D., additional

Published
2020
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