570 results on '"Davé, R"'
Search Results
402. Dust and power: Unravelling the merger-active galactic nucleus connection in the second half of cosmic history.
- Author
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La Marca, A., Margalef-Bentabol, B., Wang, L., Gao, F., Goulding, A. D., Martin, G., Rodriguez-Gomez, V., Trager, S. C., Yang, G., Davé, R., and Dubois, Y.
- Subjects
- *
SPECTRAL energy distribution , *SUPERMASSIVE black holes , *ACTIVE galactic nuclei , *CONVOLUTIONAL neural networks , *MERGERS & acquisitions - Abstract
Aims. Galaxy mergers represent a fundamental physical process under hierarchical structure formation, but their role in triggering active galactic nuclei (AGNs) is still unclear. We aim to investigate the merger-AGN connection using state-of-the-art observations and novel methods for detecting mergers and AGNs. Methods. We selected stellar mass-limited samples at redshift z < 1 from the Kilo-Degree Survey (KiDS), focussing on the KiDS-N-W2 field with a wide range of multi-wavelength data. We analysed three AGN types, selected in the mid-infrared (MIR), X-ray, and via spectral energy distribution (SED) modelling. To identify mergers, we used convolutional neural networks (CNNs) trained on two cosmological simulations. We created mass- and redshift-matched control samples of non-mergers and non-AGNs. Results. We first investigated the merger-AGN connection using a binary AGN/non-AGN classification. We observed a clear AGN excess (of a factor of 2–3) in mergers with respect to non-mergers for the MIR AGNs, along with a mild excess for the X-ray and SED AGNs. This result indicates that mergers could trigger all three types, but are more connected to the MIR AGNs. About half of the MIR AGNs are in mergers but it is unclear whether mergers are the main trigger. For the X-ray and SED AGNs, mergers are unlikely to be the dominant triggering mechanism. We also explored the connection using the continuous AGN fraction fAGN parameter. Mergers exhibit a clear excess of high fAGN values relative to non-mergers, for all AGN types. We unveil the first merger fraction fmerger − fAGN relation with two distinct regimes. When the AGN is not very dominant, the relation is only mildly increasing or even flat, with the MIR AGNs showing the highest fmerger. In the regime of very dominant AGNs (fAGN ≥ 0.8), fmerger shows the same steeply rising trend with increasing fAGN for all AGN types. These trends are also seen when plotted against AGN bolometric luminosity. We conclude that mergers are most closely connected to dust-obscured AGNs, generally linked to a fast-growing phase of the supermassive black hole. Such mergers therefore stand as the main (or even the sole) fuelling mechanism of the most powerful AGNs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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403. Upper airway resistance syndrome, insomnia, and functional somatic syndromes.
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Guilleminault C and Davé R
- Subjects
- Humans, Sleep Apnea, Obstructive physiopathology, Syndrome, Sleep Apnea, Obstructive complications, Sleep Initiation and Maintenance Disorders etiology
- Published
- 2003
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404. Simulating the Effects of Intergalactic Gray Dust.
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Croft RA, Davé R, Hernquist L, and Katz N
- Abstract
Using a high-resolution cosmological hydrodynamic simulation, we present a method to constrain extinction due to intergalactic gray dust based on the observed magnitudes of distant Type Ia supernovae. We apply several simple prescriptions to relate the intergalactic dust density to the gas density in the simulation, thereby obtaining dust extinctions that may be directly compared with the observed distribution of supernova magnitudes. Our analysis is sensitive to the spatial distribution of gray dust but is not dependent on its intrinsic properties, such as its opacity or grain size. We present an application of our technique to the supernova data of Perlmutter et al., who find that their high-redshift sample is approximately 0.2 mag fainter than the expectation for a nonaccelerating, low-density universe. We find that for gray dust to be responsible, it must be distributed quite smoothly (e.g., tracing intergalactic gas). More realistic dust distributions, such as dust tracing the metal density, are inconsistent with observations at the 1.5-2 sigma level. Upcoming observations and improved modeling of the dust distribution should lead to stronger constraints on intergalactic gray dust extinction.
- Published
- 2000
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405. 524: Effect of a Selective IP Receptor Antagonist on the Micturition Reflex in Anesthetized Rats
- Author
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Cefalu, Joseph S., Shetty, Sanjay G., Eggers, Anne-Christin, Nunn, Philip A., Blue, Dave R., Jr, Daniels, Donald V., and Ford, Anthony
- Published
- 2004
- Full Text
- View/download PDF
406. Combining ALMA with HST and VLT to Find the Counterparts of Submillimetre Galaxies
- Author
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Wiklind, T., Conselice, C. J., Dahlen, T., Dickinson, M. E., Ferguson, H. C., Grogin, N. A., Guo, Y., Anton Koekemoer, Mobasher, B., Mortlock, A., Fontana, A., Davé, R., Yan, H., Acquaviva, V., Ashby, M. L. N., Barro, G., Caputi, K. I., Castellano, M., Dekel, A., Donley, J. L., Fazio, G. G., Giavalisco, M., Grazian, A., Hathi, N. P., Kurczynski, P., Lu, Y., Mcgrath, E. J., Mello, D. F., Peth, M., Safarzadeh, M., Stefanon, M., Targett, T., and Kapteyn Astronomical Institute
- Subjects
Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
The identification of optical/near-infrared counterparts to submillimetre galaxies (SMGs) has been one of the most enduring obstacles in learning more about the nature of these massively star-forming systems, including their true redshift distribution. Various techniques have been partially successful but it is only by imaging the submillimetre (submm) emission at the same angular resolution as the optical images that counterparts can be securely assigned. With ALMA it is now possible to image the redshifted dust emission from these objects with a minimum investment of observing time. The results of an analysis of the properties of the counterparts of ten submm galaxies that fall within the CANDELS coverage of the GOODS-S field is presented. All ten SMGs show homogeneous properties in their dust and gas content, but only eight show (surprisingly) homogeneous properties in terms of the stellar mass and characteristic age of the stellar population. The two deviating counterparts are discussed.
407. International patients in a Turkish hospital: a quantitative study on cross-border health care at the intersection of Eastern Europe, Asia and the Middle East
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Jan-Walter De Neve, Davé, R., Gürel, M., and Subramanian, S. V.
408. LADUMA: looking at the distant universe with the MeerKAT array
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Blyth, S. -L, Baker, A. J., Holwerda, B. W., Bassett, B. A., Bershady, M. A., Bouchard, A., Briggs, F. H., Catinella, B., Chemin, L., Crawford, S. M., Cress, C. M., Cunnama, D., Darling, J. K., Davé, R., Deane, R. P., Blok, W. J. G., Elson, E. C., Faltenbacher, A., February, S., Fernández, X., Frank, B. S., Gawiser, E., Henning, P. A., Hess, K. M., Heywood, I., Hughes, J. P., Jarvis, M. J., Kannappan, S. J., Katz, N. S., Kereš, D., Klöckner, H. -R, Kraan-Korteweg, R. C., Lah, P., Lehnert, M. D., Leroy, A. K., Lochner, M., Maddox, N., Makhathini, S., Gerhardt Meurer, Meyer, M. J., Moodley, K., Morganti, R., Obreschkow, D., Oh, S. -H, Oosterloo, T. A., Pisano, D. J., Popping, A., Popping, G., Ravindranath, S., Schinnerer, E., Schröder, A. C., Sheth, K., Skelton, R., Smirnov, O. M., Smith, M., Somerville, R. S., Srianand, R., Staveley-Smith, L., Stewart, I. M., Vaccari, M., Väisänen, P., Heyden, K. J., Driel, W., Verheijen, M. A. W., Walter, F., Wilcots, E. M., Williams, T. B., Woudt, P. A., Wu, J. F., Zwaan, M. A., Zwart, J. T. L., and Rawlings, S.
- Abstract
The cosmic evolution of galaxies’ neutral atomic gas content is a major science driver for the Square Kilometre Array (SKA), as well as for its South African (MeerKAT) and Australian (ASKAP) precursors. Among the H I large survey programs (LSPs) planned for ASKAP and MeerKAT, the deepest and narrowest tier of the “wedding cake” will be defined by the combined L-band+UHF-band Looking At the Distant Universe with the MeerKAT Array (LADUMA) survey, which will probe H I in emission within a single “cosmic vuvuzela” that extends to z = 1.4, when the universe was only a third of its present age. Through a combination of individual and stacked detections (the latter relying on extensive multi-wavelength studies of the survey’s target field), LADUMA will study the redshift evolution of the baryonic Tully–Fisher relation and the cosmic H I density, the variation of the H I mass function with redshift and environment, and the connection between H I content and galaxies’ stellar properties (mass, age, etc.). The survey will also build a sample of OH megamaser detections that can be used to trace the cosmic merger history. This proceedings contribution provides a brief introduction to the survey, its scientific aims, and its technical implementation, deferring a more complete discussion for a future article after the implications of a recent review of MeerKAT LSP project plans are fully worked out.
409. Polymer strip films for delivery of poorly water-soluble drugs
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Scott Krull, Li, M., Bilgili, E., and Davé, R. N.
410. Particle dynamics in a conical screen mill
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Deng, X., James Scicolone, Han, X., and Davé, R. N.
411. Successful treatment of an allergic reaction in a red tattoo with the Nd-YAG laser
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Dave, R and Mahaffey, P.J.
- Published
- 2002
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412. Small intestinal permeability andmicrovillar alterations in murine giardiasis: The role of T cells
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Scott, Kevin G-E, Kirk, Dave R., Rix, Ann Marie, Meddings, Jonathon B., and Buret, Andre G.
- Published
- 2000
- Full Text
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413. Under the Guns--New York: 1775-1776. Bruce, Bliven Jr.
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Palmer, Dave R.
- Published
- 1973
- Full Text
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414. Star formation efficiency across large-scale galactic environments
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Ghodsi, Laya, Man, Allison W S, Donevski, Darko, Davé, Romeel, Lim, Seunghwan, Lovell, Christopher C, Narayanan, Desika, Ghodsi, Laya, Man, Allison W S, Donevski, Darko, Davé, Romeel, Lim, Seunghwan, Lovell, Christopher C, and Narayanan, Desika
- Published
- 2024
415. Outshining by Recent Star Formation Prevents the Accurate Measurement of High-z Galaxy Stellar Masses
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Narayanan, Desika, Lower, Sidney, Torrey, Paul, Brammer, Gabriel, Cui, Weiguang, Davé, Romeel, Iyer, Kartheik G., Li, Qi, Lovell, Christopher C., Sales, Laura V., Stark, Daniel P., Marinacci, Federico, Vogelsberger, Mark, Narayanan, Desika, Lower, Sidney, Torrey, Paul, Brammer, Gabriel, Cui, Weiguang, Davé, Romeel, Iyer, Kartheik G., Li, Qi, Lovell, Christopher C., Sales, Laura V., Stark, Daniel P., Marinacci, Federico, and Vogelsberger, Mark
- Published
- 2024
416. The Next Generation Deep Extragalactic Exploratory Public (NGDEEP) Survey
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Bagley, Micaela B., Pirzkal, Nor, Finkelstein, Steven L., Papovich, Casey, Berg, Danielle A., Lotz, Jennifer M., Leung, Gene C. K., Ferguson, Henry C., Koekemoer, Anton M., Dickinson, Mark, Kartaltepe, Jeyhan S., Kocevski, Dale D., Somerville, Rachel S., Yung, L. Y. Aaron, Backhaus, Bren E., Casey, Caitlin M., Castellano, Marco, Chávez Ortiz, Óscar A., Chworowsky, Katherine, Cox, Isabella G., Davé, Romeel, Davis, Kelcey, Estrada-carpenter, Vicente, Fontana, Adriano, Fujimoto, Seiji, Gardner, Jonathan P., Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Hathi, Nimish P., Hutchison, Taylor A., Jaskot, Anne E., Jung, Intae, Kewley, Lisa J., Kirkpatrick, Allison, Larson, Rebecca L., Matharu, Jasleen, Natarajan, Priyamvada, Pentericci, Laura, Pérez-gonzález, Pablo G., Ravindranath, Swara, Rothberg, Barry, Ryan, Russell, Shen, Lu, Simons, Raymond C., Snyder, Gregory F., Trump, Jonathan R., Wilkins, Stephen M., Bagley, Micaela B., Pirzkal, Nor, Finkelstein, Steven L., Papovich, Casey, Berg, Danielle A., Lotz, Jennifer M., Leung, Gene C. K., Ferguson, Henry C., Koekemoer, Anton M., Dickinson, Mark, Kartaltepe, Jeyhan S., Kocevski, Dale D., Somerville, Rachel S., Yung, L. Y. Aaron, Backhaus, Bren E., Casey, Caitlin M., Castellano, Marco, Chávez Ortiz, Óscar A., Chworowsky, Katherine, Cox, Isabella G., Davé, Romeel, Davis, Kelcey, Estrada-carpenter, Vicente, Fontana, Adriano, Fujimoto, Seiji, Gardner, Jonathan P., Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Hathi, Nimish P., Hutchison, Taylor A., Jaskot, Anne E., Jung, Intae, Kewley, Lisa J., Kirkpatrick, Allison, Larson, Rebecca L., Matharu, Jasleen, Natarajan, Priyamvada, Pentericci, Laura, Pérez-gonzález, Pablo G., Ravindranath, Swara, Rothberg, Barry, Ryan, Russell, Shen, Lu, Simons, Raymond C., Snyder, Gregory F., Trump, Jonathan R., and Wilkins, Stephen M.
- Published
- 2024
417. ZFOURGE/CANDELS: ON THE EVOLUTION OF M* GALAXY PROGENITORS FROM z = 3 TO 0.5.
- Author
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Papovich, C., Labbé, I., Quadri, R., Tilvi, V., Behroozi, P., Bell, E. F., Glazebrook, K., Spitler, L., Straatman, C. M. S., Tran, K. -V, Cowley, M., Davé, R., Dekel, A., Dickinson, M., Ferguson, H. C., Finkelstein, S. L., Gawiser, E., Inami, H., Faber, S. M., and Kacprzak, G. G.
- Subjects
STELLAR mass ,MILKY Way ,GALAXY formation ,GALACTIC evolution - Abstract
Galaxies with stellar masses near M* contain the majority of stellar mass in the universe, and are therefore of special interest in the study of galaxy evolution. The Milky Way (MW) and Andromeda (M31) have present-day stellar masses near M*, at 5 × 10
10 M☼ (defined here to be MW-mass) and 1011 M☼ (defined to be M31-mass). We study the typical progenitors of these galaxies using the FOURSTAR Galaxy Evolution Survey (ZFOURGE). ZFOURGE is a deep medium-band near-IR imaging survey, which is sensitive to the progenitors of these galaxies out to z ∼ 3. We use abundance-matching techniques to identify the main progenitors of these galaxies at higher redshifts. We measure the evolution in the stellar mass, rest-frame colors, morphologies, far-IR luminosities, and star formation rates, combining our deep multiwavelength imaging with near-IR Hubble Space Telescope imaging from Cosmic Near-IR Deep Extragalactic Legacy Survey (CANDELS), and Spitzer and Herschel far-IR imaging from Great Observatories Origins Deep Survey-Herschel and CANDELS-Herschel. The typical MW-mass and M31-mass progenitors passed through the same evolution stages, evolving from blue, star-forming disk galaxies at the earliest stages to redder dust-obscured IR-luminous galaxies in intermediate stages and to red, more quiescent galaxies at their latest stages. The progenitors of the MW-mass galaxies reached each evolutionary stage at later times (lower redshifts) and with stellar masses that are a factor of two to three lower than the progenitors of the M31-mass galaxies. The process driving this evolution, including the suppression of star formation in present-day M* galaxies, requires an evolving stellar-mass/halo-mass ratio and/or evolving halo-mass threshold for quiescent galaxies. The effective size and SFRs imply that the baryonic cold-gas fractions drop as galaxies evolve from high redshift to z ∼ 0 and are strongly anticorrelated with an increase in the Sérsic index. Therefore, the growth of galaxy bulges in M* galaxies corresponds to a rapid decline in the galaxy gas fractions and/or a decrease in the star formation efficiency. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
418. Computers for imagemaking: Dave R Clark (ed) Published for the British Universities Film Council Ltd by Pergamon Press, Oxford, UK (1981) 156 pp, £6.00 and £12.00
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Landsdown, John, Lansdown Holt, Turner, and London, Paterson
- Published
- 1981
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- View/download PDF
419. THE CLOWES-CAMPUSANO LARGE QUASAR GROUP SURVEY. I. GALEX SELECTED SAMPLE OF LYMAN BREAK GALAXIES AT z ∼ 1.
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Haberzettl, L., Williger, G. M., Lauroesch, J. T., Haines, C. P., Valls-Gabaud, D., Harris, K. A., Koekemoer, A. M., Loveday, J., Campusano, L. E., Clowes, R. G., Davé, R., Graham, M. J., and Söchting, I. K.
- Published
- 2009
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420. The Physical and Photometric Properties of High-Redshift Galaxies in Cosmological Hydrodynamic Simulations.
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Finlator, K., Davé, R., Papovich, C., and Hernquist, L.
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- 2006
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421. The Mass-to-Light Function: Antibias and Ωm.
- Author
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Bahcall, N. A., Cen, R., Davé, R., Ostriker, J. P., and Yu, Q.
- Published
- 2000
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422. The Swiss-3DImage collection and PDB-Browser on the World-Wide Web
- Author
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Peitsch, Manuel C., Wells, Timothy N.C., Stampf, Dave R., and Sussman, Joel L.
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- 1995
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423. Beliefs and resistance in obsessive-complulsive disorder: Observations from a controlled study
- Author
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Ito, Ligia M., de Araujo, Luiz A., Hemsley, Dave R., and Marks, Isaac M.
- Published
- 1995
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424. Contrast echocardiography
- Author
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Winkelmann, J.W., Kenner, M.D., Dave, R., Chandwaney, R.H., and Feinstein, S.B.
- Published
- 1994
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425. Egg, larval, and fingerling traits of crosses among striped bass ( Morone saxatilis), white bass ( M. chrysops), and their F1 hybrids
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Bosworth, Brian G., Libey, George S., and Notter, Dave R.
- Published
- 1997
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426. Eccentric geomagnetic dipole drift
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Cain, Joseph C., Schmitz, Dave R., and Kluth, Christopher
- Published
- 1985
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427. Ultrasound studies in preterm infants with hydrocephalus
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Graziani, L., Dave, R., Desai, H., Branca, P., Waldroup, L., and Goldberg, B.
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- 1980
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428. Physiochemical, mineralogical, and isotopic characterization of magnetite-rich iron oxides formed by thermophilic iron-reducing bacteria
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Zhang, Chuanlun, Liu, Shi, Phelps, Tommy J., Cole, Dave R., Horita, Juske, Fortier, Steve M., Elless, Mark, and Valley, John W.
- Published
- 1997
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429. The role of sexual imprinting for sex recognition in zebra finches: a difference between males and females
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Vos, Dave R.
- Published
- 1995
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430. Measurements of the angular momentum–mass relations in the Simba simulation.
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Elson, E., Glowacki, M., and Davé, R.
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ANGULAR measurements , *ANGULAR momentum (Mechanics) , *GALACTIC evolution , *GALAXIES , *GALACTIC dynamics , *STELLAR mass - Abstract
We present measurements of the specific angular momentum content (j) of galaxies drawn from the Simba cosmological hydrodynamic simulations. For the stellar, H i and baryonic matter components we demonstrate the existence of extremely tight relations between j and the mass contained within the radius at which the H i mass surface density decreases to 1 M ⊙ pc−2. These relations are broadly consistent with a variety of empirical measurements. We confirm the observational result that the scatter in the stellar j – M relation is driven largely by H i content, and measure the dependence of its scatter on the deviations of galaxies from other important scaling relations. For a given stellar mass, H i -rich/poor galaxies have more/less-than-average stellar specific angular momentum. A similar, yet weaker, correlation exists for H i mass fraction. Overall, our results demonstrate the utility of the Simba simulations as a platform for understanding and contextualising the data and results from forthcoming large galaxy surveys. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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431. Cosmic Sands:The Origin of Dusty, Star-forming Galaxies in the Epoch of Reionization
- Author
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Lower, Sidney, Narayanan, Desika, Li, Qi, Davé, Romeel, Lower, Sidney, Narayanan, Desika, Li, Qi, and Davé, Romeel
- Published
- 2023
432. CEERS Key Paper. I. An Early Look into the First 500 Myr of Galaxy Formation with JWST
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Finkelstein, Steven L., Bagley, Micaela B., Ferguson, Henry C., Wilkins, Stephen M., Kartaltepe, Jeyhan S., Papovich, Casey, Yung, L. Y. Aaron, Arrabal Haro, Pablo, Behroozi, Peter, Dickinson, Mark, Kocevski, Dale D., Koekemoer, Anton M., Larson, Rebecca L., Le Bail, Aurélien, Morales, Alexa M., Pérez-gonzález, Pablo G., Burgarella, Denis, Davé, Romeel, Hirschmann, Michaela, Somerville, Rachel S., Wuyts, Stijn, Bromm, Volker, Casey, Caitlin M., Fontana, Adriano, Fujimoto, Seiji, Gardner, Jonathan P., Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Hathi, Nimish P., Hutchison, Taylor A., Jha, Saurabh W., Jogee, Shardha, Kewley, Lisa J., Kirkpatrick, Allison, Long, Arianna S., Lotz, Jennifer M., Pentericci, Laura, Pierel, Justin D. R., Pirzkal, Nor, Ravindranath, Swara, Ryan, Russell E., Trump, Jonathan R., Yang, Guang, Bhatawdekar, Rachana, Bisigello, Laura, Buat, Véronique, Calabrò, Antonello, Castellano, Marco, Cleri, Nikko J., Cooper, M. C., Croton, Darren, Daddi, Emanuele, Dekel, Avishai, Elbaz, David, Franco, Maximilien, Gawiser, Eric, Holwerda, Benne W., Huertas-company, Marc, Jaskot, Anne E., Leung, Gene C. K., Lucas, Ray A., Mobasher, Bahram, Pandya, Viraj, Tacchella, Sandro, Weiner, Benjamin J., Zavala, Jorge A., Finkelstein, Steven L., Bagley, Micaela B., Ferguson, Henry C., Wilkins, Stephen M., Kartaltepe, Jeyhan S., Papovich, Casey, Yung, L. Y. Aaron, Arrabal Haro, Pablo, Behroozi, Peter, Dickinson, Mark, Kocevski, Dale D., Koekemoer, Anton M., Larson, Rebecca L., Le Bail, Aurélien, Morales, Alexa M., Pérez-gonzález, Pablo G., Burgarella, Denis, Davé, Romeel, Hirschmann, Michaela, Somerville, Rachel S., Wuyts, Stijn, Bromm, Volker, Casey, Caitlin M., Fontana, Adriano, Fujimoto, Seiji, Gardner, Jonathan P., Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Hathi, Nimish P., Hutchison, Taylor A., Jha, Saurabh W., Jogee, Shardha, Kewley, Lisa J., Kirkpatrick, Allison, Long, Arianna S., Lotz, Jennifer M., Pentericci, Laura, Pierel, Justin D. R., Pirzkal, Nor, Ravindranath, Swara, Ryan, Russell E., Trump, Jonathan R., Yang, Guang, Bhatawdekar, Rachana, Bisigello, Laura, Buat, Véronique, Calabrò, Antonello, Castellano, Marco, Cleri, Nikko J., Cooper, M. C., Croton, Darren, Daddi, Emanuele, Dekel, Avishai, Elbaz, David, Franco, Maximilien, Gawiser, Eric, Holwerda, Benne W., Huertas-company, Marc, Jaskot, Anne E., Leung, Gene C. K., Lucas, Ray A., Mobasher, Bahram, Pandya, Viraj, Tacchella, Sandro, Weiner, Benjamin J., and Zavala, Jorge A.
- Published
- 2023
433. ASymba: H i global profile asymmetries in the simba simulation.
- Author
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Glowacki, M, Deg, N, Blyth, S-L, Hank, N, Davé, R, Elson, E, and Spekkens, K
- Subjects
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ROTATION of galaxies , *GALACTIC evolution , *GALAXY mergers , *RADIO galaxies , *RADIO lines , *GALAXIES - Abstract
Asymmetry in the spatially integrated, 1D H i global profiles of galaxies can inform us on both internal (e.g. outflows) and external (e.g. mergers, tidal interactions, and ram pressure stripping) processes that shape galaxy evolution. Understanding which of these primarily drive H i profile asymmetry is of particular interest. In the lead-up to SKA pathfinder and SKA H i emission surveys, hydrodynamical simulations have proved to be a useful resource for such studies. Here, we present the methodology behind, as well as first results, of ASymba: Asymmetries in H i of Simba galaxies, the first time this simulation suite has been used for this type of study. We generate mock observations of the H i content of these galaxies and calculate the profile asymmetries using three different methods. We find that |$M_{\rm H\, {\small I}}$| has the strongest correlation with all asymmetry measures, with weaker correlations also found with the number of mergers a galaxy has undergone, and gas and galaxy rotation. We also find good agreement with the xGASS sample, in which galaxies with highly asymmetric profiles tend to have lower H i gas fractions than galaxies with symmetric profiles, and additionally find the same holds in sSFR parameter space. For low H i mass galaxies, it is difficult to distinguish between asymmetric and symmetric galaxies, but this becomes achievable in the high H i mass population. These results showcase the potential of ASymba and provide the groundwork for further studies, including comparison to upcoming large H i emission surveys. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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434. A study of the physical stability of wet media-milled fenofibrate suspensions using dynamic equilibrium curves.
- Author
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Knieke, C., Azad, M. A., Davé, R. N., and Bilgili, E.
- Subjects
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FENOFIBRATE , *SODIUM dodecyl sulfate , *METHYLCELLULOSE , *SUSPENSIONS (Chemistry) , *STABILIZING agents , *SURFACE chemistry , *AGGLOMERATION (Materials) - Abstract
Physical stability of wet media-milled fenofibrate (FNB, drug) suspensions containing stabilizers hydroxypropyl methyl cellulose (HPMC) and sodium dodecyl sulfate (SDS) is investigated. Traditionally, optimal stabilizer concentration is determined by assessing the particle size after milling and during storage in a multitude of experiments. Here, in a novel approach, similar physical stability information is generated via stepwise addition of a stabilizer at the end of milling in a single experiment and it is represented by a dynamic equilibrium curve. Such curves were generated for HPMC, SDS, and HPMC--SDS after milling and after 7-day storage. A unique optimal SDS concentration was found irrespective of the HPMC concentration (above a minimum), which was governed by agglomeration at low SDS concentration and by Ostwald ripening at high SDS concentration. Additional milling experiments with initial stabilizer addition instead of stepwise addition validated the new method, i.e. dynamic equilibrium curves via stepwise addition, which also revealed guiding principles for a stable FNB suspension. Unlike initial addition of SDS in multiple experiments, stepwise addition at the end of milling yielded the dynamic equilibrium curve in a single experiment for the 0.5-5% SDS concentration (wrt FNB), which resulted in 75% time saving and 83% drug saving. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
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435. These 6 Things : How to Focus Your Teaching on What Matters Most
- Author
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Dave Stuart Jr and Dave Stuart Jr
- Subjects
- Interdisciplinary approach in education, Language arts--Correlation with content subjects, Effective teaching, Teachers--Job stress, Teachers--Workload
- Abstract
Streamline literacy instruction while increasing student achievement Dave R. Stuart Jr.'s work is centered on a simple belief: all students and teachers can flourish. Yet that seemingly simple goal can feel unattainable when teachers are expected to teach core content within the disciplines and improve literacy in their classrooms. How can teachers and students flourish under so much pressure? Stuart's advice: Take a deep breath and refocus on six known best practices— establish and strengthen key beliefs, then build knowledge and increase reading, writing, speaking and listening, and argumentation in every content area, every day. These 6 Things is all about streamlining your practice so that you're teaching smarter, not harder, and kids are learning, doing, and flourishing in ELA and content-area classrooms. In this essential new resource, teachers will receive Proven, classroom-tested advice delivered in an approachable, teacher-to-teacher style that builds confidence Practical strategies for streamlining instruction in order to focus on key beliefs and literacy-building activities Solutions and suggestions for the most common teacher and student'hang-ups'Numerous recommendations for deeper reading on key topics In addition to teaching English and world history for more than a decade, Stuart is well-known for his blog DaveStuartJr.com, which has over 35,000 visitors each month. This popular resource has been a beacon of light for more than 10,000 subscribers who refuse to freak out about the everyday challenges of teaching in a high-stakes era. He presents professional development workshops and institutes for schools around the United States and offers a number of online learning tools and experiences on his website.
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- 2019
436. How Well Can We Measure Galaxy Dust Attenuation Curves? The Impact of the Assumed Star-dust Geometry Model in Spectral Energy Distribution Fitting
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Lower, Sidney, Narayanan, Desika, Parlow, Joel L, Johnson, Benjamin D., Gourley, Charlie, Davé, Romeel, Lower, Sidney, Narayanan, Desika, Parlow, Joel L, Johnson, Benjamin D., Gourley, Charlie, and Davé, Romeel
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- 2022
437. sígame v3: Gas Fragmentation in Postprocessing of Cosmological Simulations for More Accurate Infrared Line Emission Modeling
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Olsen, Karen Pardos, Burkhart, Blakesley, Mac Low, Mordecai-Mark, Treß, Robin G., Greve, Thomas R., Vizgan, David, Motka, Jay, Borrow, Josh, Popping, Gergö, Davé, Romeel, Smith, Rowan J., Narayanan, Desika, Olsen, Karen Pardos, Burkhart, Blakesley, Mac Low, Mordecai-Mark, Treß, Robin G., Greve, Thomas R., Vizgan, David, Motka, Jay, Borrow, Josh, Popping, Gergö, Davé, Romeel, Smith, Rowan J., and Narayanan, Desika
- Abstract
We present an update to the framework called Simulator of Galaxy Millimeter/submillimeter Emission (sígame). sígame derives line emission in the far-infrared (FIR) for galaxies in particle-based cosmological hydrodynamics simulations by applying radiative transfer and physics recipes via a postprocessing step after completion of the simulation. In this version, a new technique is developed to model higher gas densities by parameterizing the probability distribution function (PDF) of the gas density in higher-resolution simulations run with the pseudo-Lagrangian, Voronoi mesh code arepo. The parameterized PDFs are used as a look-up table, and reach higher densities than in previous work. sígame v3 is tested on redshift z = 0 galaxies drawn from the simba cosmological simulation for eight FIR emission lines tracing vastly different phases of the interstellar medium. This version of sígame includes dust radiative transfer with Skirt and high-resolution photoionization models with Cloudy, the latter sampled according to the density PDF of the arepo simulations to augment the densities in the cosmological simulation. The quartile distributions of the predicted line luminosities overlap with the observed range for nearby galaxies of similar star formation rate (SFR) for all but two emission lines: [O i]63 and CO(3–2), which are overestimated by median factors of 1.3 and 1.0 dex, respectively, compared to the observed line–SFR relation of mixed-type galaxies. We attribute the remaining disagreement with observations to the lack of precise attenuation of the interstellar light on sub-grid scales (≲200 pc) and differences in sample selection
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- 2021
438. Modeling dust in a universe of galaxies
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Narayanan, Desika, Li, Qi, Davé, Romeel, Conroy, Charlie, Johnson, Benjamin D., Popping, Gergo, Narayanan, Desika, Li, Qi, Davé, Romeel, Conroy, Charlie, Johnson, Benjamin D., and Popping, Gergo
- Abstract
In this invited talk, we discuss the physics of the lifecycle of dust in the context of galaxy formation simulations. After outlining the basic physical processes, we apply algorithms for the formation, growth, and destruction of dust in the ISM to a state-of-the-art cosmological simulation to develop a model for the evolution of the dust to gas and dust to metals ratios in galaxies. We show that while modern simulations are able to match the observed dust mass function at redshift z = 0, most models underpredict the observed mass function at high-redshift (z = 2). We then show the power of these techniques by expanding our model to include a spectrum of dust sizes, and make initial predictions for extinction laws in local galaxies.
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- 2020
439. Valor in Vietnam : Chronicles of Honor, Courage, and Sacrifice: 1963-1977
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Allen B. Clark and Allen B. Clark
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- Vietnam War, 1961-1975--Personal narratives, American, Vietnam War, 1961-1975--Veterans
- Abstract
“A well-informed, compelling compilation of the ‘up close and personal'side of the Vietnam War... [a] masterful chronicle of first person stories” (Vice Admiral David B. Robinson, USN, Ret., Navy Cross recipient). Every war continues to dwell in the lives it touched, in the lives of those living through that time, and in those absorbed by its historical significance. The Vietnam War lives on—famously or infamously, depending on political points of view—but those who have “been there, done that” have a highly personalized window on their time of that history. Valor in Vietnam focuses on nineteen stories of Vietnam, stories of celebrated figures in the veteran community, compelling war narratives, vignettes of battles, and the emotional impact on the combatants. It is replete with leadership lessons and valuable insights that are just as applicable today as they were forty years ago. This is an anecdotal history of America's war in Vietnam composed of firsthand narratives by Vietnam War veterans presented in chronological order. They are intense, emotional, and highly personal stories. Connecting each of them is a brief historical commentary of that period of the war, the geography of the story, and the contemporary strategy written by Lewis Sorley, West Point class of 1956, and author of A Better War and Westmoreland. With a foreword by Lt. Gen. Dave R. Palmer, US Army (Ret.), Valor in Vietnam presents an overview of the war through the eyes of participants in each branch of service and throughout the entire course of the war. Simply put, their stories serve to reflect the commitment, honor, and dedication with which America's veterans performed their service.
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- 2012
440. Lincoln for President : An Unlikely Candidate, An Audacious Strategy, and the Victory No One Saw Coming
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Bruce Chadwick Ph.D and Bruce Chadwick Ph.D
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- Political campaigns--United States--History--19th century, Presidential candidates--United States--Biography, Presidents--United States--Election--1860
- Abstract
The untold story of the drama, controversy, and incredible political genius of Lincoln's first presidential campaignIn May of 1860, Republican delegates gathered in Chicago for their second-ever convention, with the full expectation of electing William Seward their next presidential candidate. But waiting in the wings was a dark horse no one suspected, putting the final touches on a plan that would not only result in a most unexpected candidacy, but the most brilliant, innovative, and daring presidential campaign in American history. He went by the name of Lincoln.Lincoln for President is the incredible story of how Lincoln overcame overwhelming odds to not only capture his party's nomination but win the presidency. His amazingly modern strategy included the first media campaign blitz, convention tactics that originated the concept of'Chicago politics,'and a deft manipulation of the electoral college. His bold tactics changed forever the way presidential campaigns are won…not to mention the course of American history.PRAISE FOR BRUCE CHADWICKTriumvirate:'Dr. Chadwick tells an exciting story… His analysis will provoke further debate about this momentous period in American history.'Dr. Paul Clemens, Chairman of the Rutgers University Department of History'In this remarkable new book, Bruce Chadwick reminds us of the three extraordinary men who worked state by state, individual by individual, to ensure passage of the Constitution. It's a fascinating tale, well told.'Terry Golway, author of Washington's General and Ronald Reagan's America 1858:'This book is a gem.'Curled Up With a Good Book'A gripping narrative.'Kurt Piehler, author of Remembering War the American Way The First American Army:'To understand the Revolutionary War, really understand it, read this book.'Dave R. Palmer, Lieutenant General, U.S. Army (Ret); author of The Way of the Fox George Washington's War:'Chadwick pierces the fog of myth that has always surrounded our nation's father.'Michael Aaron Rockland, professor, Rutgers University
- Published
- 2009
441. Chapter 29 - Laparoscopic Esophageal Myotomy: Techniques and Results
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Lal, Dave R. and Oelschlager, Brant K.
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442. CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST
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Steven L. Finkelstein, Micaela B. Bagley, Henry C. Ferguson, Stephen M. Wilkins, Jeyhan S. Kartaltepe, Casey Papovich, L. Y. Aaron Yung, Pablo Arrabal Haro, Peter Behroozi, Mark Dickinson, Dale D. Kocevski, Anton M. Koekemoer, Rebecca L. Larson, Aurélien Le Bail, Alexa M. Morales, Pablo G. Pérez-González, Denis Burgarella, Romeel Davé, Michaela Hirschmann, Rachel S. Somerville, Stijn Wuyts, Volker Bromm, Caitlin M. Casey, Adriano Fontana, Seiji Fujimoto, Jonathan P. Gardner, Mauro Giavalisco, Andrea Grazian, Norman A. Grogin, Nimish P. Hathi, Taylor A. Hutchison, Saurabh W. Jha, Shardha Jogee, Lisa J. Kewley, Allison Kirkpatrick, Arianna S. Long, Jennifer M. Lotz, Laura Pentericci, Justin D. R. Pierel, Nor Pirzkal, Swara Ravindranath, Russell E. Ryan, Jonathan R. Trump, Guang Yang, Rachana Bhatawdekar, Laura Bisigello, Véronique Buat, Antonello Calabrò, Marco Castellano, Nikko J. Cleri, M. C. Cooper, Darren Croton, Emanuele Daddi, Avishai Dekel, David Elbaz, Maximilien Franco, Eric Gawiser, Benne W. Holwerda, Marc Huertas-Company, Anne E. Jaskot, Gene C. K. Leung, Ray A. Lucas, Bahram Mobasher, Viraj Pandya, Sandro Tacchella, Benjamin J. Weiner, Jorge A. Zavala, Finkelstein, SL [0000-0001-8519-1130], Bagley, MB [0000-0002-9921-9218], Ferguson, HC [0000-0001-7113-2738], Wilkins, SM [0000-0003-3903-6935], Kartaltepe, JS [0000-0001-9187-3605], Papovich, C [0000-0001-7503-8482], Yung, LY [0000-0003-3466-035X], Haro, PA [0000-0002-7959-8783], Behroozi, P [0000-0002-2517-6446], Dickinson, M [0000-0001-5414-5131], Kocevski, DD [0000-0002-8360-3880], Koekemoer, AM [0000-0002-6610-2048], Larson, RL [0000-0003-2366-8858], Le Bail, A [0000-0002-9466-2763], Morales, AM [0000-0003-4965-0402], Pérez-González, PG [0000-0003-4528-5639], Burgarella, D [0000-0002-4193-2539], Davé, R [0000-0003-2842-9434], Hirschmann, M [0000-0002-3301-3321], Somerville, RS [0000-0002-6748-6821], Wuyts, S [0000-0003-3735-1931], Bromm, V [0000-0003-0212-2979], Casey, CM [0000-0002-0930-6466], Fontana, A [0000-0003-3820-2823], Fujimoto, S [0000-0001-7201-5066], Gardner, JP [0000-0003-2098-9568], Giavalisco, M [0000-0002-7831-8751], Grazian, A [0000-0002-5688-0663], Grogin, NA [0000-0001-9440-8872], Hathi, NP [0000-0001-6145-5090], Hutchison, TA [0000-0001-6251-4988], Jha, SW [0000-0001-8738-6011], Jogee, S [0000-0002-1590-0568], Kewley, LJ [0000-0001-8152-3943], Kirkpatrick, A [0000-0002-1306-1545], Long, AS [0000-0002-7530-8857], Lotz, JM [0000-0003-3130-5643], Pentericci, L [0000-0001-8940-6768], Pierel, JDR [0000-0002-2361-7201], Pirzkal, N [0000-0003-3382-5941], Ravindranath, S [0000-0002-5269-6527], Ryan, RE [0000-0003-0894-1588], Trump, JR [0000-0002-1410-0470], Yang, G [0000-0001-8835-7722], Bhatawdekar, R [0000-0003-0883-2226], Bisigello, L [0000-0003-0492-4924], Buat, V [0000-0003-3441-903X], Calabrò, A [0000-0003-2536-1614], Castellano, M [0000-0001-9875-8263], Cleri, NJ [0000-0001-7151-009X], Cooper, MC [0000-0003-1371-6019], Croton, D [0000-0002-5009-512X], Daddi, E [0000-0002-3331-9590], Dekel, A [0000-0003-4174-0374], Elbaz, D [0000-0002-7631-647X], Franco, M [0000-0002-3560-8599], Gawiser, E [0000-0003-1530-8713], Holwerda, BW [0000-0002-4884-6756], Huertas-Company, M [0000-0002-1416-8483], Jaskot, AE [0000-0002-6790-5125], Leung, GCK [0000-0002-9393-6507], Lucas, RA [0000-0003-1581-7825], Mobasher, B [0000-0001-5846-4404], Pandya, V [0000-0002-2499-9205], Tacchella, S [0000-0002-8224-4505], Weiner, BJ [0000-0001-6065-7483], Zavala, JA [0000-0002-7051-1100], and Apollo - University of Cambridge Repository
- Subjects
epoch simulations flares ,cosmology legacy survey ,deblended dust emission ,uv luminosity functions ,ultra-deep field ,hubble frontier fields ,FOS: Physical sciences ,Astronomy and Astrophysics ,initial mass function ,5109 Space Sciences ,space-telescope observations ,Astrophysics - Astrophysics of Galaxies ,Space and Planetary Science ,similar-to 10 ,Astrophysics of Galaxies (astro-ph.GA) ,51 Physical Sciences ,high-redshift galaxies - Abstract
We present an investigation into the first 500 Myr of galaxy evolution from the Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one of 13 JWST ERS programs, targets galaxy formation from z~0.5 to z>10 using several imaging and spectroscopic modes. We make use of the first epoch of CEERS NIRCam imaging, spanning 35.5 sq. arcmin, to search for candidate galaxies at z>9. Following a detailed data reduction process implementing several custom steps to produce high-quality reduced images, we perform multi-band photometry across seven NIRCam broad and medium-band (and six Hubble broadband) filters focusing on robust colors and accurate total fluxes. We measure photometric redshifts and devise a robust set of selection criteria to identify a sample of 26 galaxy candidates at z~9-16. These objects are compact with a median half-light radius of ~0.5 kpc. We present an early estimate of the z~11 rest-frame ultraviolet (UV) luminosity function, finding that the number density of galaxies at M_UV ~ -20 appears to evolve very little from z~9 to z~11. We also find that the abundance (surface density [arcmin^-2]) of our candidates exceeds nearly all theoretical predictions. We explore potential implications, including that at z>10 star formation may be dominated by top-heavy initial mass functions, which would result in an increased ratio of UV light per unit halo mass, though a complete lack of dust attenuation and/or changing star-formation physics may also play a role. While spectroscopic confirmation of these sources is urgently required, our results suggest that the deeper views to come with JWST should yield prolific samples of ultra-high-redshift galaxies with which to further explore these conclusions., 41 pages, 20 figures, 6 tables, submitted to ApJL. Key results in Figures 13-15, discussed in Sections 7 and 8
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- 2022
- Full Text
- View/download PDF
443. The minimum halo mass for star formation at z=6-8
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Finlator, Kristian Markwart, Prescott, Moire K. M., Oppenheimer, B.D., Davé, Romeel, Zackrisson, Erik, Livermore, R.C., Finkelstein, Steven L., Thompson, Robert, Huang, Shuiyao, Finlator, Kristian Markwart, Prescott, Moire K. M., Oppenheimer, B.D., Davé, Romeel, Zackrisson, Erik, Livermore, R.C., Finkelstein, Steven L., Thompson, Robert, and Huang, Shuiyao
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- 2017
444. Simulating the 21 cm signal from reionization including non-linear ionizations and inhomogeneous recombinations
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Hassan, Sultan, Davé, Romeel, Finlator, Kristian, Santos, Mario G., Hassan, Sultan, Davé, Romeel, Finlator, Kristian, and Santos, Mario G.
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- 2016
445. Summons of Trumpet : U.S.-Vietnam in Perspective
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Dave R. Palmer and Dave R. Palmer
- Subjects
- Vietnam War, 1961-1975--United States
- Abstract
Soldier/scholar Palmer traces the history of the American involvement in Vietnam and shows how events in both the U.S. and Vietnam became inextricably linked as domestic dissent and a lack of realistic, viable military strategy ultimately led to America's first lost war.
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- 1995
446. The host haloes of O i absorbers in the reionization epoch
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Finlator, Kristian Markwart, Muñoz, Joseph A., Oppenheimer, B.D., Peng, Oh.S., Özel, Feryal, Davé, Romeel, Finlator, Kristian Markwart, Muñoz, Joseph A., Oppenheimer, B.D., Peng, Oh.S., Özel, Feryal, and Davé, Romeel
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- 2013
447. Continuing dental education requirements for state dental relicensure and constituent society membership
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Graham, James W. and DeMarais, Dave R.
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- 1975
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448. Contributors
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Abcarian, Herand, Al-Refaie, Waddah B., Ando, Hisami, Arciero, Cletus A., Arcuni, Joanna C., Ashley, Stanley W., Avital, Itzhak, Backhus, Leah M., Bailey, H. Randolph, Barabouti, Dimitra G., Barlow, John M., Bartlett, Stephen T., Bastawrous, Amir L., Beck, David E., Bergman, Jacques J.G.H.M., Bharucha, Adil E., Binion, David, Blebea, John, Bleday, Ronald, Blom, Dennis, Blumgart, Leslie H., Bockman, Dale E., Boley, Scott J., Bonavina, Luigi, Boushey, Robin P., Brabender, Jan, Bremner, Cedric G., Bremner, Ross M., Broderick, Timothy J., Brolin, Robert E., Burgdorf, Michael R., Burjonrappa, Sathyaprasad C., Burns, R. Cartland, Buzdon, Molly M., Cameron, John L., Camilleri, Michael, Camp, E. Ramsay, Canon, Cheri M., Carne, Peter W.G., Cassim, Riaz, Castell, Donald O., Cataldo, Peter, Cemaj, Samuel, Chandrasoma, Parakrama, Chang, Andrew C., Chang, Eugene Y., Chang, George J., Chessin, David B., Cho, Clifford S., Chojnacki, Karen A., Choti, Michael A., Choudry, Rashad, Christensen, Donald O., Chun, Albert K., Church, James M., Cima, Robert R., Clavien, Pierre-Alain, Cohen, Alfred M., Cohen, Jeffrey L., Colombani, Paul M., Colquhoun, Steven D., Comerota, Anthony J., Coosemans, Willy, Cornwell, Edward E., III, Craig, Daniel A., Crookes, Peter F., Dahm, Felix, Daly, John M., Day, Jarrod, Decker, Georges, Dehn, Thomas C.B., De Leyn, Paul, DeMaria, Eric J., DeMeester, Steven R., DeMeester, Tom R., Demetriou, Achilles A., Dempsey, Daniel T., DeRosier, L. Christopher, Dolan, James P., Donohue, John H., Dozois, Eric J., Dunn, Stephen, Duranceau, André, Efron, Jonathan E., Eisenberg, Burton L., Engum, Scott A., Enker, Warren E., Evans, Douglas B., Evers, B. Mark, Fazio, Victor W., Felix, Edward L., Filipi, Charles J., Fischer, David R., Fitzgibbons, Robert J., Jr., Fogel, Evan L., Fong, Yuman, Ford, Debra Holly, Fuchs, Karl-Hermann, Gadacz, Thomas R., Galandiuk, Susan, Gale, Henry, Gallagher, Scott F., Gandamihardja, Tasha A.K., Goldberg, Amy J., Goldin, Steven B., Gomez, Henry F., Gores, Gregory J., Greenberg, Jacob A., Grewal, Harsh, Grosfeld, Jay L., Guillem, José G., Hagen, Jeffrey A., Harbison, Sean P., Harrell, Andrew G., Haut, Elliott R., Heitmiller, Richard F., Henderson, J. Michael, Heniford, B. Todd, Bruns, Doris Henne, Herlong, H. Franklin, Hofstetter, Wayne L., Hölscher, Arnulf H., Huber, Philip, Jr, Hungness, Eric S., Hunter, John G., Huprich, James E., Hussain, Hero K., Hutter, Matthew M., Hyman, Neil H., Iglesias, Roberto C., Ignacio, Elizabeth A., Isenberg, Gerald, Iqbal, Atif, Ivatury, Rao R., Izbicki, Jakob R., Jackson, Lindsey N., Jacobs, Danny O., Jaffray, Colleen E., Jamal, Mohammad K., Jephcott, Catherine, Jobe, Blair A., Jobst, Michael A., Johnston, Michael, Jorden, Jeffrey R., Kaleya, Ronald, Karp, Seth J., Kashef, Elika, Kauer, Werner K.H., Kaufman, Howard S., Kayton, Mark L., Kellum, John M., Kercher, Kent W., Kim, Soo Y., Klein, Andrew S., Koruda, Mark J., Kowalski, Christopher, Kozarek, Richard A., Kuwayama, David, Ladner, Daniela, Lal, Dave R., Langnas, Alan N., Larson, David W., Law, Simon, Lawler, L.P., Lazaridis, Konstantinos N., Leeser, David B., Lehman, Glen A., Lerut, Toni, Levi, David M., Lidor, Anne, Liebermann-Meffert, Dorothea, Lillemoe, Keith D., Loftus, Edward V., Jr., Lord, Reginald V.N., Louie, Brian E., Lowe, Val J., Lynch, Matthew L., MacCarty, Robert L., Madoff, Robert D., Maheshwari, Anurag, Malagó, Massimo, Mami, Ahmed, Mann, Oliver, Marcello, Peter W., Marks, Jeffrey M., Marohn, Michael R., Maron, David J., Martz, Joseph, Mason, Rodney John, Mathisen, Douglas J., Matthews, Jeffrey B., McFadden, David W., McHenry, Lee, McMurrick, Paul J., Mee, Anthony S., Meilahn, John E., Mercer, David W., Migaly, John, Miller, Matthew Todd, Miller, Thomas A., Molmenti, Ernesto P., Morris, Jon B., Morse, Christopher R., McCready Mortensen, Neal James, Moxon, Ruth, Mulholland, Michael W., Mun, Edward C., Murr, Michel M., Nafteux, Philippe, Nagle, Alexander P., Nagorney, David M., Nawabi, Atta, Nelson, Heidi, Nishi, Gregg K., Nissen, Nicholas N., Northup, C. Joe, Norton, Jeffrey A., Novitsky, Yuri W., Nussbaum, Michael S., Oelschlager, Brant K., Oh, Daniel S., O'Rourke, Robert W., Orringer, Mark B., Otterson, Mary F., Ouellette, James R., Overby, D. Wayne, Paidas, Charles N., Papaconstantinou, Harry T., Pappas, Theodore N., Parc, Rolland, Parikh, Alexander A., Parker, Susan C., Pathak, Abhijit S., Patti, Marco G., Pegoli, Walter, Jr., Pemberton, John H., Penna, Christophe, Peters, Jeffrey H., Phillips, Edward H., Pickens, Allan, Pitt, Henry A., Polk, Hiram C., Jr., Ponsky, Jeffrey L., Popa, Emil L., Posner, Mitchell C., Prosser, Brent J., Puri, Varun, Que, Florencia G., Radtke, Arnold, Rai, Rudra, Rakinic, Jan, Rattner, David W., Raz, Dan J., Rice, Thomas William, Roberts, John P., Roberts, Patricia L., Rolandelli, Rolando, Rosato, Ernest L., Rosemurgy, Alexander, Rosenkranz, Kari M., Sabnis, Adheesh A., Saclarides, Theodore J., Saetzler, Rainer K., Sagar, Peter M., Sakorafas, George H., Saltz, Leonard B., Sarr, Michael G., Savas, Jeannie F., Schirmer, Bruce, Schneider, Paul M., Schoetz, David J., Jr., Schulick, Richard D., Schwartz, Marshall Z., Seamon, Mark, Senagore, Anthony J., Shapiro, A.M. James, Sherman, Stuart, Sheth, Ketan R., Sicklick, Jason K., Sigurdson, Elin R., Simeone, Diane M., Simmang, Clifford L., Simpkins, Cuthbert O., Sitzmann, James V., Slakey, Douglas P., Soltes, Amy P., Sonnenday, Christopher J., Soper, Nathaniel J., Sotiropoulos, George C., Soybel, David I., Jon Spechler, Stuart, Steele, Kimberley E., Stein, Hubert J., Stewart, F. Dylan, Stocchi, Luca, Stoner, Michael C., Strate, Tim G., Strong, Scott A., Suliburk, James W., Swanström, Lee L., Swartz, Daniel E., Takada, Tadahiro, Tamm, Eric P., Tavakkolizadeh, Ali, Tedesco, Pietro, Teh, Swee H., Telford, Gordon L., Marosky Thacker, Julie K., Thompson, Jon S., Thorson, Alan G., Traverso, L. William, Truong, Wayne, Turner, Douglas J., Tutuian, Radu, Tzakis, Andreas G., Utley, David, Vallböhmer, Daniel, Van Raemdonck, Dirk, Venbrux, Anthony C., Vickers, Selwyn M., Villar, Hugo V., Wallace, James R., Wang, Huamin, Wasserberg, Nir, Watkins, James L., Watson, Thomas J., Weintraub, William H., Weiser, Martin R., Welch, John P., Welton, Mark L., Wexner, Steven D., Wheeler, James M.D., White, Rebekah R., Wiegel, Thomas, Wolff, Bruce G., Wolfsen, Herbert C., Wong, W. Douglas, Worsey, M. Jonathan, Wright, Alene J., Yao, Francis, Yekebas, Emre F., Yeo, Charles J., You, Y. Nancy, Young-Fadok, Tonia M., Zibari, Gazi B., and Zuccaro, Gregory, Jr.
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449. Performance of Heterogeneous Autoregressive Models of Realized Volatility: Evidence from U.S. Stock Market
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Seďa, Petr
- Subjects
Global financial crisis ,in-sample forecast ,realized volatility ,heterogeneous autoregressive model ,U.S. stock market - Abstract
This paper deals with heterogeneous autoregressive models of realized volatility (HAR-RV models) on high-frequency data of stock indices in the USA. Its aim is to capture the behavior of three groups of market participants trading on a daily, weekly and monthly basis and assess their role in predicting the daily realized volatility. The benefits of this work lies mainly in the application of heterogeneous autoregressive models of realized volatility on stock indices in the USA with a special aim to analyze an impact of the global financial crisis on applied models forecasting performance. We use three data sets, the first one from the period before the global financial crisis occurred in the years 2006-2007, the second one from the period when the global financial crisis fully hit the U.S. financial market in 2008-2009 years, and the last period was defined over 2010-2011 years. The model output indicates that estimated realized volatility in the market is very much determined by daily traders and in some cases excludes the impact of those market participants who trade on monthly basis., {"references":["T. G. Andersen, T. Bollerslev, F. X. Diebold, and P. Labys, \"The\ndistribution of exchange rate volatility,\" Journal of the American\nStatistical Association, vol. 96, pp. 42-55, 2003.","T. G. Andersen, T. Bollerslev, and F. Diebold, \"Roughing it up:\nIncluding jump components in the measurement, modelling and\nforecasting of return volatility,\" Review of Economics and Statistics, vol.\n89, pp. 701-720, 2007.","K. Back, \"Asset pricing for general processes,\" Journal of Mathematics\nEconomics, vol. 20, pp. 371-395, 1991.","O. Barndorff-Nielsen, and N. Shephard, \"Power and bipower variation\nwith stochastic volatility and jumps,\" Journal of Financial\nEconometrics, vol. 2, pp. 1-37, 2004.","O. Barndorff-Nielsen, and N. Shephard, \"Econometrics of testing for\njumps in financial economics using bipower variation,\" Journal of\nFinancial Econometrics, vol. 4, pp. 1-30, 2006.","O. Barndorff-Nielsen, and N. Shephard, \"Variation, jumps, market\nfrictions and high frequency data in financial econometrics,\" Economics\nSeries Working Papers no. 240, University of Oxford, 2007.","L. Bauwens, Ch. Hafner, and S. Laurent, Handbook of Volatility Models\nand Their Applications, New York: John Wiley&Sons, 2012.","F. Corsi, \"A Simple Long Memory Model of Realized Volatility,\"\nJournal of Financial Econometrics, vol. 7, pp. 174-196, 2009.","F. Corsi, M. Dacorogna, U. Műller, and G. Zumbach, \"Consistent Highprecision\nVolatility from High-frequency Data, ÔÇ×Economic Notes\", vol.\n30, pp. 183-204, 2001.\n[10] F. Corsi., U. Kretschmer, S. Mittnik, and C. Pigorsch, \"The volatility of\nrealized volatility,\" Economic Review, vol. 27, pp.1-33, 2008.\n[11] F. Corsi, F., D. Pirino, and R. Reno, \"Volatility forecasting: The jumps\ndo matter,\" Hitotsubashi University Discussion paper series 36, 2009.\n[12] J. Hanclova, \"The effects of domestic and external shocks on a small\nopen country: the evidence from the Czech Economy,\" International\nJournal of Mathematical Models and Methods in Applied Sciences, vol.\n6, pp. 366-375, 2012.\n[13] A. Lo, J. Y. Campbell, and C. A, Mackinlay, The Econometrics of\nFinancial Markets, New York: Princeton University Press, 1997.\n[14] T. Lux, and M. Marchesi, \"Scaling and criticality in a stochastic\nmultiagent model of financial market,\" Nature, vol. 397, pp. 498-500,\n1999.\n[15] U. Műller, M. Dacorogna, R. Davé, R. Olsen, O. Pietet, and J. von\nWeizsacker, \"Volatilities of different time resolutions - analysing the\ndynamics of market components,\" Journal of Empirical Finance , vol. 4,\npp. 213-239, 1997.\n[16] E. Peters, Fractal Market Analysis, New York: John Wiley&Sons, 1994.\n[17] J. Such├í─ìek, Territorial Development Reconsidered. Ostrava: V┼áB-TU\nOstrava, 2009."]}
- Published
- 2012
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450. Air pollution and rural biomass fuels in developing countries: A pilot village study in India and implications for research and policy
- Author
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Menon, Premlata
- Published
- 1989
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