Results 51 to 60 of about 28,808 (222)

Emission of HeH(+) in nebulae

The Astrophysical Journal, 1993
The formation and destruction processes of HeH + in nebulae are discussed, and calculations of the abundances of HeH + are presented. It is shown that for effective temperatures of the ionizing source exceeding 50,000 K, the abundances are of the order of 10 12 cm −2 , largely independent of the nebular parameters.
C. Cecchi-Pestellini, A. Dalgarno
openaire   +1 more source

Emission Nebulae as Radio Sources [PDF]

Australian Journal of Physics, 1956
Attempts have been made to detect 14 bright emission nebulae at a wavelength of 3?5 m using a pencil-beam radio telescope with a beamwidth of 50 min of arc. Of these nebulae, six were probably observed in emission, seven were undetectable, and one, NGC 6357, was observed in absorption; radio isophotes were obtained for NGC 2237 and NGC 3372.
BY Mills, AG Little, KV Sheridan
openaire   +1 more source

Catch Me If You Can: The Dynamic Nature of Bias in Machine Learning Applications

Information Systems Journal, EarlyView.
ABSTRACT Bias in machine learning (ML) applications represents systematic differences between expected and actual values of the predicted outputs, such that certain individuals or groups are systematically and disproportionately (dis)advantaged. This paper investigates the dynamic nature of bias in ML applications.
Monideepa Tarafdar, Irina Rets, Yang Hu
wiley   +1 more source

Gas Accretion and Giant Lyman-alpha Nebulae

, 2016
Several decades of observations and discoveries have shown that high-redshift AGN and massive galaxies are often surrounded by giant Lyman-alpha nebulae extending in some cases up to 500 kpc in size.
A. Basu-Zych, A. Bunker, A. Dekel, A. Dey, A. Humphrey, A. Humphrey, A. Humphrey, A. Humphrey, B. P. Venemans, C. C. Steidel, C. C. Steidel, C. C. Steidel, C. C. Steidel, C. Leitherer, C. Scarlata, C.-A. Faucher-Giguère, D. C. Martin, D. C. Martin, D. E. Osterbrock, D. J. B. Smith, D. P. Schneider, E. Borisova, E. C. Herenz, E. Lusso, E. M. Hu, E. M. Hu, F. Arrigoni Battaia, F. Arrigoni Battaia, F. Courbin, F. Valentino, H. J. A. Röttgering, J. A. Kollmeier, J. Bergeron, J. Bergeron, J. D. Kurk, J. E. Geach, J. E. Geach, J. F. Hennawi, J. F. Hennawi, J. G. Baker, J. Rosdahl, J. W. Fried, J. X. Prochaska, K. K. Nilsson, L. Christensen, L. Pentericci, L. Wisotzki, M. A. Fardal, M. Beck, M. Dijkstra, M. Dijkstra, M. Fumagalli, M. Hayes, M. K. M. Prescott, M. K. M. Prescott, M. K. M. Prescott, M. K. M. Prescott, M. Reuland, M. Trebitsch, M. Villar-Martín, M. Villar-Martín, M. Weidinger, M. Weidinger, N. K. Hine, N. P. H. Nesvadba, N. P. H. Nesvadba, N. Roche, P. D. Barthel, P. J. Francis, P. J. Francis, P. J. McCarthy, P. J. McCarthy, P. J. McCarthy, P. J. McCarthy, P. L. North, P. Møller, P. Palunas, R. A. Overzier, R. Antonucci, R. Antonucci, R. F. Trainor, R. Ojik van, R. Ojik van, S. A. Eales, S. C. Chapman, S. C. Chapman, S. Cantalupo, S. Cantalupo, S. Cantalupo, S. Cantalupo, S. Cantalupo, S. Djorgovski, S. F. Sánchez, S. J. Lilly, S. R. Furlanetto, S. Veilleux, T. Goerdt, T. M. Heckman, T. Saito, W. C. Keel, Y. Ao, Y. Matsuda, Y. Matsuda, Y. Shen, Y. Taniguchi, Y. Ueda, Y. Yang, Y. Yang, Z. Haiman   +108 more
core   +1 more source

Planetary nebulae and their mimics: the MASH-MEN Project [PDF]

, 2011
The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is about 3000, approximately twice the number known a decade ago.
Boissay, Rozenn, Bojicic, Ivan, Frew, David J., Parker, Quentin A.   +3 more
core   +1 more source

Explicit Methodologies for Normative Evaluation in Public Policy, as Applied to Carbon Budgets

Journal of Applied Philosophy, EarlyView.
ABSTRACT What could philosophical or justice perspectives contribute to climate (and other applied philosophy) policy discussions? This question is important for philosophers on government policy committees. This article identifies two novel concerns about such contexts (which I call ‘contingent selection’ and ‘committee deference’) and systematizes ...
Kian Mintz‐Woo
wiley   +1 more source

Using Polarization to Uncover the Lyα Emission Mechanism in Lyα Nebulae

The Astrophysical Journal
“Ly α nebulae” are immense (∼100 kpc) glowing gas clouds located in the distant universe, and the origin of their extended Ly α emission remains a mystery.
Eunchong Kim, Yujin Yang, Sung-Joon Park, Ann Zabludoff, Paul Smith, Myung Gyoon Lee, Woong-Seob Jeong, Buell Jannuzi, Narae Hwang, Byeong-Gon Park   +9 more
doaj   +1 more source

Optical observations of the nearby galaxy IC342 with narrow band [SII] and Hα filters. I [PDF]

Serbian Astronomical Journal, 2013
We present observations of a portion of the nearby spiral galaxy IC342 using narrow band [SII] and Hα filters. These observations were carried out in November 2011 with the 2m RCC telescope at Rozhen National Astronomical Observatory in Bulgaria.
Vučetić M.M., Arbutina B., Urošević D., Dobardžić A., Pavlović M.Z., Pannuti T.G., Petrov N.   +6 more
doaj   +1 more source

X-ray Emission from the Binary Central Stars of the Planetary Nebulae HFG 1, DS 1, and LoTr 5

, 2010
Close binary systems undergoing mass transfer or common envelope interactions can account for the morphological properties of some planetary nebulae. The search for close binary companions in planetary nebulae is hindered by the difficulty of detecting ...
Arnaud, Bohm, Bruch, Cargill, Chu, Churazov, De Marco, Drake, Frank, Frew, Grauer, Groth, Guerrero, Heckathorn, Heckathorn, Hilditch, Jasniewicz, Jeffries, Joel H. Kastner, Jordan, Kastner, Kastner, Kuczawska, Marsh, Mathioudakis, Montez, Motch, Muerset, Muerset, O'Dwyer, Orsola De Marco, Paczynski, Press, Ricker, Rodolfo Montez, Sanz-Forcada, Serber, Snowden, Soker, Stassun, Strassmeier, Thevenin, Weisskopf, You-Hua Chu   +43 more
core   +1 more source

Decisions Under Radical Uncertainty: The Role of Volitional Liminality in Radical Innovation

Journal of Product Innovation Management, EarlyView.
ABSTRACT Academic Summary Radical innovation management can be understood as an organizational practice that enacts distant futures, which are open‐ended and unknowable. Such radical innovation endeavors are thus characterized by radical uncertainty, where possible futures are not only quantitatively but qualitatively different from the present, and ...
José Antonio Rosa, Marcelo F. de la Cruz Jara, Jelena Spanjol   +2 more
wiley   +1 more source