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38 results on '"International Astronomical Union"'

1. Astronomy from the exile: a study of the Sahrawi astronomical knowledge with project ‘AMANAR: Under the same sky’

Author

Asociación Canaria de Amistad con el Pueblo Saharaui, International Astronomical Union, Instituto de Astrofísica de Canarias, Rodríguez Antón, Andrea, Amanar team, Asociación Canaria de Amistad con el Pueblo Saharaui, International Astronomical Union, Instituto de Astrofísica de Canarias, Rodríguez Antón, Andrea, and Amanar team

Abstract

The Sahrawis (original inhabitants of Western Sahara) are a traditional bedouin society descendant of the Arab tribe Beni Hassan, that migrated from Arabia to the Maghreb and expanded throughout the Sahara desert and Mauritania in the early Middle Ages (Awah, 2015). Because of their nomadic lifestyle, they developed a deep knowledge of the sky, that nowadays is seriously threatened due to the mostly oral transmission of their culture and the dramatic break with the traditional lifestyle that started with the Spanish colonization of the Western Sahara in the last 19th century. The later Spanish withdrawal of the territory in 1976, was followed by the attack of Morocco and Mauritania that forced thousand of people to exile and settle in refugee camps around Tindouf (Algeria), causing a situation that persists and is defined as ‘one of the most protracted refugee situations worldwide’. This work is part of the project ‘Amanar: Under the same sky’ by the non-profit science education initiative Galileo Mobile (GM) and the Canary Association of Friendship with the Sahrawi People (ACAPS), in collaboration with the Instituto de Astrofísica de Canarias (IAC). Its aim is inspiring youth and teachers from the Sahrawi refugee camps through astronomy as well as the preservation of a intangible cultural heritage that is their traditional astronomical knowledge. Here we present the previous results obtained from a serie of interviews conducted by the Amanar team in October 2019 in the refugee camps of Tindouf (Algeria) with people who used the stars in the desert for weather prediction, for moving across the territory, religion and also to avoid attacks during the war. That is, for survival.

Published
2023

2. Development in astronomy and space science in Africa

Author

Science and Technology Facilities Council (UK), Royal Astronomical Society, International Astronomical Union, European Astronomical Society, Pović, Mirjana, Backes, Michael, Baki, Paul, Baratoux, David, Tessema, Solomon Belay, Benkhaldoun, Zouhair, Bode, Michael, Klutse, Nana A. Browne, Charles, Phil, Govender, Kevin, van Groningen, Ernst, Jurua, Edward, Mamo, Alemiye, Manxoyi, Sivuyile, McBride, Vanessa, Mimouni, Jamal, Nemaungani, Takalani, Nkundabakura, Pheneas, Okere, Bonaventure, Saad, Somaya, Simpemba, Prospery C., Walwa, Tefera, Yilma, Abdissa, Science and Technology Facilities Council (UK), Royal Astronomical Society, International Astronomical Union, European Astronomical Society, Pović, Mirjana, Backes, Michael, Baki, Paul, Baratoux, David, Tessema, Solomon Belay, Benkhaldoun, Zouhair, Bode, Michael, Klutse, Nana A. Browne, Charles, Phil, Govender, Kevin, van Groningen, Ernst, Jurua, Edward, Mamo, Alemiye, Manxoyi, Sivuyile, McBride, Vanessa, Mimouni, Jamal, Nemaungani, Takalani, Nkundabakura, Pheneas, Okere, Bonaventure, Saad, Somaya, Simpemba, Prospery C., Walwa, Tefera, and Yilma, Abdissa

Abstract

The development of astronomy and space science in Africa has grown significantly over the past few years. These advancements make the United Nations Sustainable Development Goals more achievable, and open up the possibility of new beneficial collaborations. © 2018 The Publisher.

Published
2018

3. Simulations of recoiling massive black holes

Author

International Astronomical Union, IAU, International Astronomical Union, IAU, ( ), Guedes, J, Madau, P, Mayer, L, Kuhlen, M, Diemand, J, Zemp, M, International Astronomical Union, IAU, International Astronomical Union, IAU, ( ), Guedes, J, Madau, P, Mayer, L, Kuhlen, M, Diemand, J, and Zemp, M

Abstract

The coalescence of black hole binaries is a significant source of gravitational wave radiation. The typically asymmetric nature of this emission, which carries linear momentum, can result in the recoil of the black hole remnant with velocities in the range 100 < Vrecoil < 3750 km s‑1. The detectability of recoiling massive black holes (MBH) as off-nuclear QSOs is tightly connected with the properties of the host galaxy, which determine the MBH's orbit and fuel reservoir. We present the results of N-body simulations of recoiling MBHs in high-resolution, non-axisymmetric potentials. We find that if the recoil velocities are high enough to reach regions of the galaxy dominated by the generally triaxial dark matter distribution, the return time is significantly extended when compared to a spherical distribution. We also perform simulations of recoiling MBHs traveling in gas merger remnants, where large amounts of gas have been funneled to the central regions, In this case, the MBHs remain within R<1 kpc from the center of the host even for high recoil velocities (Vrecoil = 1200 km s‑1) due to the compactness of the remnant galaxy's nuclear disk. We discuss the implications of both scenarios for detectability.

Published
2009

4. NASE, atrévete con el Universo

Author

International Astronomical Union, Consejo Superior de Investigaciones Científicas (España), Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina), International Astronomical Union, Consejo Superior de Investigaciones Científicas (España), and Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)

Abstract

NASE (Network for Astronomy School Education) es un curso de didáctica de la astronomía, auspiciado por la Unión Astronómica Internacional (UAI) y tiene por finalidad la capacitación de docentes de nivel primario y secundario en didáctica de la astronomía. Los destinatarios de los cursos son docentes de nivel primario y profesores de educaciòn secundaria, y como parte también de introducción al tema en el caso de nivel universitario. Si bien el curso está destinado a profesores de Ciencias Naturales (Física, Matemáticas, Química) también es importante la presencia de profesores de Historia, Biología y Filosofía. La modalidad de esta propuesta es teórico-práctica, con énfasis en el desarrollo de talleres en donde el “hacer” permite al docente afirmar sus conocimientos para la aplicación inmediata de los recursos en el aula. Los temas de los cursos de NASE son la astronomía de posición, sistema solar, los exoplanetas, espectrografía, la fotometría, la espectroscopia, entre otros. El objetivo principal de NASE es establecer en cada país un Grupo Local de los miembros de la Asociación que cada año repiten la experiencia de la enseñanza y crean nuevos cursos mediante el uso de materiales NASE. En esta página se incluyen todos los materiales para el curso básico y un repositorio de materiales docentes para la astronomía con actividades, animaciones, artículos, fotos, juegos, simulaciones, programas interactivos y videos.

Published
2012

6. Sun

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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7. Stellar Systems, Galaxy, Extragalactic Objects, Cosmology

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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8. Radio Sources, X-ray Sources, Cosmic Rays

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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9. Interstellar Matter, Nebulae

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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10. Periodicals, Proceedings, Books, Activities

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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11. Space Research

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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12. Astronomical Instruments and Techniques

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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13. Theoretical Astrophysics

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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14. Positional Astronomy, Celestial Mechanics

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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15. Abbreviations

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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16. Applied Mathematics, Physics

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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17. Planetary System

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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18. Earth

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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19. Mapping galaxy components with kinematics : dynamical models with stellar and gaseous kinematics

Author

Yang, Meng, Weijmans, Anne-Marie, China Scholarship Council (CSC), Scottish Universities Physics Alliance (SUPA), Royal Astronomical Society (RAS), and International Astronomical Union. Symposium (353rd : 2019 : Shanghai, China)

Subjects
Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Mapping galaxy mass distribution is an important means of understanding galaxy morphology and the nature of dark matter haloes, and therefore build up our knowledge of galaxy formation and evolution. Analytical and numerical dynamical models are powerful methods to model galaxy mass distributions based on galaxy stellar kinematics, and are strengthened by including gaseous kinematics. In this thesis, I start my research with using descriptive analytical models to identify thin-disc components in galaxies. I kinematically classify the sample into disc-dominated, non-disc-dominated and disc-free galaxies and measure the dynamical mass for disc-dominated galaxies to study their mass budget. I find a dichotomy of lenticular galaxies in my classification, which is explained by the deficiency of molecular gas. Realising the limitation of analytical models, I continue my research with numerical models. I develop an orbit-based method with stellar kinematics modelled by the Schwarzschild technique, and cold gas (H I ) assumed as a thin disc aligned with stars. The application of this method to early-type galaxy NGC 2974 shows that including extended cold gas kinematics significantly narrows down the measurement of the dark matter inner slope. I then further generalise this method to be adapted for galaxies with misaligned stellar and gas discs and apply the generalised method to early-type NGC 3626. The results suggest that with very extended cold gas discs out to 10 Rₑ, there is a chance to determine the overall shape of dark matter halo and even distinguish between different halo models. I finally model a larger sample of galaxies which have two-aperture stellar kinematics using the Schwarzschild technique to study their orbital components and dark matter profiles across a wider mass range. The dark matter fraction is typically 40%-70% at 3 Rₑ, and I find no clear trends between the dark matter fraction and stellar mass. "My postgraduate study was supported by the China Scholarship Council [File No. 201603780010]. My research in this thesis received grant from the Scottish Universities Physics Alliance [Postdoctoral and Early Career Researcher Exchange Program]; the Royal Astronomical Society [RAS Small Grants Scheme]; and the International Astronomical Union [IAU Symposium No. 353]." -- Funding

Published
2020

20. Introduction

Author

Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hofmann, W., Matas, V. R., Schmadel, L. D., Wielen, R., Zech, G., Auspices of the International Astronomical Union, Burkhardt, G., editor, Esser, U., editor, Hefele, H., editor, Heinrich, I., editor, Hofmann, W., editor, Matas, V. R., editor, Schmadel, L. D., editor, Wielen, R., editor, and Zech, G., editor

Published
1998
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21. Resonant Trapping of the Moving Groups G18-39 and G21-22 in the Galactic Halo

Author

E. Moreno, José G. Fernández-Trincado, William J. Schuster, Instituto de Astronomía, Univ. Nacional Autónoma de México, Universidad Nacional Autónoma de México (UNAM), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), International Astronomical Union, and Kristen B.W. McQuinn, Sabrina Stierwalt

Subjects
Physics, Milky Way, Galactic Center, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Galactic plane, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Accretion (astrophysics), Galactic halo, Stars, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, Halo, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, ComputingMilieux_MISCELLANEOUS, Dwarf galaxy
Abstract

The 3D Galactic orbits of stars in the two groups G18-39 and G21-22 pertaining to the Galactic halo have been computed in a Galactic potential including a Galactic bar. The orbits have been related with the orbital structure of resonant orbits on the Galactic plane created by the bar component. We find that the majority of stars in both groups are trapped mainly by two resonant families already studied in a previous analysis. We show that the observed U--V velocity field of the stars in both groups can be naturally explained as a result of their trapping by these two resonant families, taking the angular rotation speed of the bar approximately in the interval 45--60 $\mathrm{km\,s^{-1}\,kpc^{-1}}$. This analysis may help to understand the identification of other known star groups as the possible result of the interactions produced by resonances on stars close to resonant families. For the two groups G18-39 and G21-22 we conclude that the majority of their stars are members of the supergroups of stars in the Galaxy trapped by two resonant families generated by the Galactic bar., 22 pages, 15 figures, 3 Tables, submitted to ApJ, comments welcome

Published
2018
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22. Exploring the dusty star-formation in the early Universe using intensity mapping

Author

Guilaine Lagache, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), A*MIDEX, ERC CONCERTO (grant agreement ID 788212), International Astronomical Union, ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011), European Project: PE9, ERC-2017-ADG, Intensity mapping of the atomic carbon CII line: the promise of a new observational probe of dusty star-formation in post-reionization and reionization epoch,Advanced Grant (AdG), PE9, ERC-2017-ADG,CONCERTO(2017), and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), media_common.quotation_subject, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, sub-millimeter, galaxies: high-redshift, Cosmic infrared background, 0103 physical sciences, Galaxy formation and evolution, galaxies: formation, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, media_common, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Star formation, Intensity mapping, Astronomy, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Universe, Redshift, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Light emission, Astrophysics::Earth and Planetary Astrophysics, galaxies: evolution, galaxies: ISM, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

In the last decade, it has become clear that the dust-enshrouded star formation contributes significantly to early galaxy evolution. Detection of dust is therefore essential in determining the properties of galaxies in the high-redshift universe. This requires observations at the (sub-)millimeter wavelengths. Unfortunately, sensitivity and background confusion of single dish observations on the one hand, and mapping efficiency of interferometers on the other hand, pose unique challenges to observers. One promising route to overcome these difficulties is intensity mapping of fluctuations which exploits the confusion-limited regime and measures the collective light emission from all sources, including unresolved faint galaxies. We discuss in this contribution how 2D and 3D intensity mapping can measure the dusty star formation at high redshift, through the Cosmic Infrared Background (2D) and [CII] fine structure transition (3D) anisotropies., Comment: Invited talk for the IAU Symposium 333 "Peering towards Cosmic Dawn", Dubrovnik, October 2-6, 2017; to appear in the proceedings, eds. Vibor Jelic and Thijs van der Hulst [6 pages, 4 figures]

Published
2018
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23. Development in astronomy and space science in Africa

Author

Prospery C. Simpemba, Michael Backes, Abdissa Yilma, Takalani Nemaungani, Kevin Govender, Edward Jurua, P. A. Charles, David Baratoux, Nana Ama Browne Klutse, Ernst van Groningen, Mirjana Pović, Zouhair Benkhaldoun, Bonaventure Okere, Paul Baki, Somaya Saad, Tefera Walwa, Alemiye Mamo, Michael Bode, Solomon Belay Tessema, Sivuyile Manxoyi, Vanessa McBride, Jamal Mimouni, Pheneas Nkundabakura, Science and Technology Facilities Council (UK), Royal Astronomical Society, International Astronomical Union, and European Astronomical Society

Subjects
Sustainable development, 010504 meteorology & atmospheric sciences, Astronomy, Developing country, FOS: Physical sciences, Astronomy and Astrophysics, 01 natural sciences, Development (topology), Political science, 0103 physical sciences, Space Science, Astrophysics - Instrumentation and Methods for Astrophysics, 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), 0105 earth and related environmental sciences
Abstract

The development of astronomy and space science in Africa has grown significantly over the past few years. These advancements make the United Nations Sustainable Development Goals more achievable, and open up the possibility of new beneficial collaborations. © 2018 The Publisher., This paper is dedicated to all of the people who somehow contributed to the development of A&SS in Africa. Without them all of this would not be possible. In addition, this paper was inspired by sessions SS23 and LS7 during the 2018 European Week of A&SS (EWASS). Both sessions were supported by the UK Science and Technology Facilities Council, UK Royal Astronomical Society, International Astronomical Union Office of Astronomy for Development, European Astronomical Society, International Science Programme, and Development in Africa with Radio Astronomy project.

Published
2018

24. Simulations of Recoiling Massive Black Holes

Author

Michael Kuhlen, Marcel Zemp, Piero Madau, J. Guedes, Lucio Mayer, Jürg Diemand, University of Zurich, and International Astronomical Union, IAU

Subjects
Physics, 530 Physics, Astrophysics::High Energy Astrophysical Phenomena, Astronomy, 2701 Medicine (miscellaneous), Astronomy and Astrophysics, Primordial black hole, 2739 Public Health, Environmental and Occupational Health, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy, Black hole, Micro black hole, 1912 Space and Planetary Science, Binary black hole, Space and Planetary Science, Intermediate-mass black hole, 10231 Institute for Computational Science, 3103 Astronomy and Astrophysics, 2916 Nutrition and Dietetics, Stellar black hole, Spin-flip, Astrophysics::Galaxy Astrophysics
Abstract

The coalescence of black hole binaries is a significant source of gravitational wave radiation. The typically asymmetric nature of this emission, which carries linear momentum, can result in the recoil of the black hole remnant with velocities in the range 100 < Vrecoil < 3750 km s−1. The detectability of recoiling massive black holes (MBH) as off-nuclear QSOs is tightly connected with the properties of the host galaxy, which determine the MBH's orbit and fuel reservoir. We present the results of N-body simulations of recoiling MBHs in high-resolution, non-axisymmetric potentials. We find that if the recoil velocities are high enough to reach regions of the galaxy dominated by the generally triaxial dark matter distribution, the return time is significantly extended when compared to a spherical distribution. We also perform simulations of recoiling MBHs traveling in gas merger remnants, where large amounts of gas have been funneled to the central regions, In this case, the MBHs remain within RVrecoil = 1200 km s−1) due to the compactness of the remnant galaxy's nuclear disk. We discuss the implications of both scenarios for detectability.

Published
2017

25. Can we really use chemical properties of red-giant stars as age indicators?

Author

Céline Reylé, Nadège Lagarde, Annie C. Robin, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), International Astronomical Union, Cristina Chiappini, Ivan Minchev, Else Starkenburg, Marica Valentini, Observatoire Astronomique de l'Université de Genève (ObsGE), Université de Genève (UNIGE), Service d'hématologie clinique, and Assistance publique - Hôpitaux de Paris (AP-HP) (APHP)-Hôpital Henri Mondor-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)

Subjects
Physics, Stars, [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], 010308 nuclear & particles physics, Space and Planetary Science, Red giant, 0103 physical sciences, Astronomy and Astrophysics, Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, 01 natural sciences, ComputingMilieux_MISCELLANEOUS
Abstract

The cornerstone mission of the European Space Agency, Gaia, together with forthcoming complementary surveys (CoRoT, Kepler, K2, APOGEE and Gaia-ESO), will revolutionize our understanding of the formation and history of our Galaxy, providing accurate stellar masses, radii, ages, distances, as well as chemical properties for a very large sample of stars across different Galactic stellar populations. Using improved population synthesis approach and new stellar evolution models we attempt to evaluate the possibility to derive ages of clump stars from their chemical properties. A new version of the Besançon Galaxy models (BGM) is used in which new stellar evolutionary tracks are computed from the stellar evolution code STAREVOL. The effects of mixing on chemical composition of the stellar photosphere has a significant impact on the determined stellar age from the observed [C/N] ratio. We clearly show that transport processes occurring in red-giant stars should be taken into account in the determination of ages for future Galactic archaeology studies.

Published
2017
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26. Theoretical polarization spectrum of Na I D1 & D2 near the solar limb

Author

Bommier, V., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), IAU (International Astronomical Union) Symposium 305, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique solaire, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris

Subjects
[PHYS]Physics [physics], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

27. A Universe on which to dwell

Author

Marea Atkinson, International Astronomical Union Symposium 260 Paris France 19-23 January 2009, and Atkinson, Marea Therese

Subjects
Space (punctuation), media_common.quotation_subject, Art history, Astronomy and Astrophysics, Art, perception, Universe, Exhibition, symbolism, Space and Planetary Science, Astronomical Phenomena, Aesthetics, International Year of Astronomy, installation, art, media_common, Printmaking
Abstract

The artworks The Cosmic Garden and To Dwell Upon the Universe created for the exhibition Astronomical Inspirations, at the Salle Miró, UNESCO Headquarters, for the launch of the International Year of Astronomy reflect upon the unfolding human perception and relationship with the cosmos and speculate on the nature of space expressed in printmaking via a study of astronomical phenomena, symbolism in visual and scientific artefacts and theories. The work overlaps between the printed image, the constructed print, the artist book and installation.

Published
2009
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28. ' Nuits des étoiles ' events (1991-2008) and their impact on the French astronomical leisure landscape: Symposium S260 (The Role of Astronomy in Society and Culture) - 2009

Author

Olivier Las Vergnas, Eric Piednoël, Centre de recherches éducation et formation (CREF), Université Paris Nanterre (UPN), Département Cité des métiers - Cité de la santé - Universcience (CDM/CDS), Cité des Sciences et de l'Industrie, Association Française d'Astronomie (AFA), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Réseaux et animation, Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)-Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), International Astronomical Union, and Symposium S260 (The Role of Astronomy in Society and Culture) - 2009

Subjects
sensibilisation, 010504 meteorology & atmospheric sciences, [SHS.EDU]Humanities and Social Sciences/Education, Media studies, Astronomy and Astrophysics, Advertising, planétarium, 01 natural sciences, TV, Newspaper, Geography, 13. Climate action, Space and Planetary Science, 0103 physical sciences, popularization, [PHYS.PHYS.PHYS-POP-PH]Physics [physics]/Physics [physics]/Popular Physics [physics.pop-ph], Nuits des étoiles, awareness, astronomie, amateurs, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Public awareness
Abstract

Symposium S260 (The Role of Astronomy in Society and Culture) - 2009; International audience; The popular event entitled "Nuits des étoiles" has become in France the summer encounter with the sky. More than 400 events are set up for three consecutive days each year: several thousands of voluntary organizers invite more and more people to observe the heavens and discover astronomy. Each summer, those collective star parties reach about one hundred thousand people, several millions of sky maps are printed and distributed by newspapers and the associated TV live program broadcast by France 2 channel interested 1 to 3 millions spectators. Since 1991, "Nuits des étoiles" helped to develop organizations on the local level and increased the stakeholders' interest in general public awareness. It contributed in France to strengthen and professionalize an astronomical leisure offer.; L'événement populaire intitulée "Nuits des étoiles" est devenu en France une référence régulière. Plus de 400 événements sont mis en place pendant trois jours consécutifs chaque année: plusieurs milliers de organisateurs bénévoles invitent le grand public à observer le ciel et découvrir l'astronomie. chaque été, les soirées collectives des clubs regrpoupent environ 100 000 personnes, plusieurs millions de ciel les cartes sont imprimées et distribuées par les journaux. Des soirées TV spéciales diffusés en direct par France 2 ont intéressé 1 à 3 millions de spectateurs. Depuis 1991, les "Nuits des étoiles" ont aidé à développer le loisir astronomique au niveau local et ont accru l'intérêt accru des acteurs à la sensibilisation du public en général. Elles ont contribué en France à renforcer et à professionnaliser une offre de loisir astronomique.

Published
2009
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29. The 'Ciel, miroir des cultures' exhibition: a three-year awareness campaign on the sky as a mirror of cultures

Author

Las Vergnas, Olivier, Piednoël, Eric, Gautier, Gérard H., Centre de recherches éducation et formation (CREF), Université Paris Nanterre (UPN), Département Cité des métiers - Cité de la santé - Universcience (CDM/CDS), Cité des Sciences et de l'Industrie, Association Française d'Astronomie (AFA), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), AFA, Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)-Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), International Astronomical Union, and Symposium S260 (The Role of Astronomy in Society and Culture) - 2009

Subjects
ethnology, exhibition, [SHS.EDU]Humanities and Social Sciences/Education, [PHYS.PHYS.PHYS-POP-PH]Physics [physics]/Physics [physics]/Popular Physics [physics.pop-ph], awareness, public understanding of science
Abstract

Symposium S260 (The Role of Astronomy in Society and Culture) - 2009; International audience; The Ciel, miroir des cultures poster-exhibition was designed by the Association Française d'Astronomie and printed in 300 copies in 2005. Each copy is composed of 14 posters introducing the different ways human beings and societies have used the sky and the heavens in history. More than three hundred cultural events have now been using the exhibition in schools and community structures as public libraries and social centres, taking place mainly in low-income urban or suburban neighbourhoods. This three-year work demonstrated the relevance of this kind of tools and events to pedagogical and social aims, specifically if the event is not limited to showing posters and also offers an opportunity for dialogue.

Published
2009
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30. Determination of the Magnetic Field in Solar Prominences by means of the Hanle Effect: Theoretical Study

Author

Bommier, V., Sahal-Bréchot, S., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), International Astronomical Union, E.A. Müller, École normale supérieure - Paris (ENS-PSL), and Bommier, Véronique

Subjects
[PHYS.ASTR.SR] Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1976

31. The Hanle Effect of the Coronal Ly-alpha Line of Hydrogen

Author

Sahal-Bréchot, S., Bommier, V., Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), I.A.U. (International Astronomical Union) Colloquium n°55, Bommier, Véronique, and École normale supérieure - Paris (ENS Paris)

Subjects
[PHYS]Physics [physics], [PHYS.ASTR.SR] Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], ComputingMilieux_MISCELLANEOUS, [PHYS] Physics [physics]
Abstract

International audience

Published
1980

32. Effect of Magnetic Field and Collisions on the Linear Polarization of the Balmer Hydrogen Lines in Solar Prominences

Author

Bommier, V., Sahal-Bréchot, S., Bommier, Véronique, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), I.A.U. (International Astronomical Union) Symposium n°102, and École normale supérieure - Paris (ENS-PSL)

Subjects
[PHYS]Physics [physics], [PHYS.ASTR.SR] Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], ComputingMilieux_MISCELLANEOUS, [PHYS] Physics [physics]
Abstract

International audience

Published
1982

33. The Hanle Effect Theory applied to the Determination of Magnetic Fields in Solar Prominences

Author

Sahal-Bréchot, S., Bommier, V., Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), International Astronomical Union, P..A. Wayman, École normale supérieure - Paris (ENS-PSL), and Bommier, Véronique

Subjects
[PHYS]Physics [physics], [PHYS.ASTR.SR] Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], ComputingMilieux_MISCELLANEOUS, [PHYS] Physics [physics]
Abstract

International audience

Published
1979

34. Magnetic Fields in Quiescent Prominences

Author

Leroy, J.L., Sahal-Bréchot, S., Bommier, V., Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), International Astronomical Union XVIIIth General Assembly, Bommier, Véronique, and École normale supérieure - Paris (ENS-PSL)

Subjects
[PHYS.ASTR.SR] Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1982

35. Tracking tidal volume noninvasively in volunteers using a tightly controlled temperature-based device: A proof of concept paper.

Author

Sathyamoorthy M, Lerman J, Amolenda PG, Wilson GA, Feldman R, Moser J, Feldman U, Abraham GE 3rd, and Feldman D

Subjects
Adult, Continuous Positive Airway Pressure methods, Female, Humans, Linear Models, Male, Perioperative Period, Respiration, Respiratory Rate physiology, Temperature, Capnography methods, Monitoring, Physiologic instrumentation, Tidal Volume physiology, Volunteers statistics & numerical data
Abstract

Introduction: There is a paucity of noninvasive respiratory monitors for patients outside of critical care settings. The Linshom respiratory monitoring device is a novel temperature-based respiratory monitor that measures the respiratory rate as accurately as capnography., Objectives: Determine whether the amplitude of the Linshom temperature profile was an accurate, surrogate and qualitative metric of the tidal volume (V T ) that tracks V T in healthy volunteers., Methods: Forty volunteers breathed room air spontaneously through a tight-fitting continuous positive airway pressure mask with a Linshom device mounted in the mask. V T was measured contemporaneously using a standalone Maquet Servo-i ICU ventilator. The amplitudes of the Linshom temperature profiles were paired with the contemporaneous V T measurements using least squares linear regression analysis and the coefficient of variation (R 2 ) was determined., Results: Forty volunteers completed the study. The data from 30 of the volunteers were analysed and are presented; data from 10 volunteers were not included due to protocol violations and/or technical issues unrelated to Linshom. The fluctuations in the amplitude of the Linshom temperature profiles mapped closely with the measured V T using least squares linear regression analyses yielding a mean R 2 (95% CI) value of 0.87 (0.84-0.90)., Conclusion: These results support the notion that the Linshom temperature profile is an accurate and reliable surrogate that tracks changes in V T in healthy volunteers. Further studies are warranted in patients in clinical settings to establish the effectiveness of this monitor., (© 2019 John Wiley & Sons Ltd.)

Published
2020
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37. Scientific Research: What it Means to Me.

Author

Narlikar JV

Abstract

This article gives a personal perception of the author, of what scientific research means. Citing examples from the lives of all time greats like Newton, Kelvin and Maxwell he stresses the agonies of thinking up new ideas, the urge for creativity and the pleasure one derives from the process when it is completed. He then narrates instances from his own life that proved inspirational towards his research career. In his early studenthood, his parents and maternal uncle had widened his intellectual horizons while in later life his interaction with Fred Hoyle made him take up research challenges away from the beaten path. He concludes that taking up an anti-Establishment stand in research can create many logistical difficulties, but the rewards of success are all the more pleasing.

Published
2008
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38. Asteroid and comet impacts: the ultimate environmental catastrophe.

Author

Morrison D

Subjects
Internationality, Risk Factors, Disaster Planning methods, Disaster Planning organization & administration, Disasters statistics & numerical data, Environment, Meteoroids, Minor Planets, Risk Assessment methods
Abstract

Cosmic impacts represent the most extreme class of natural hazards, combining a very low probability of occurrence with a capability of killing hundreds of millions and destabilizing global civilization. Fortunately, these disasters are amenable to precise prediction and even (in principle) can be avoided entirely by appropriate application of space technology. However, impacts take place so rarely that they have only recently been recognized as a significant natural hazard. Concerted international action to deal with impacts depends on increased public awareness.

Published
2006
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