Bibliographies thématiques / NGC 2992

Littérature scientifique sur le sujet « NGC 2992 »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "NGC 2992"

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Joshi, U. C., Rekha Jain et M. R. Deshpande. « Photopolarimetry of Seyfert Galaxies - NGC 2992, NGC 3081, NGC 3227 and IC 4329 A ». Symposium - International Astronomical Union 134 (1989) : 321–22. http://dx.doi.org/10.1017/s0074180900141208.

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Photopolarimetric observations in UBVRI bands of Seyfert galaxies NGC 2992, NGC 3081, NGC 3227 and IC 4329A were carried between 1984–87. Measurements were made with PRL polarimeter (Deshpande et al. 1985) on 1 meter telescope of Indian Institute of Astrophysics, Kavalur. Method of observations and reduction is same as discussed elsewhere (Joshi et al. 1987).
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Allen, Mark G., Michael A. Dopita, Zlatan I. Tsvetanov et Ralph S. Sutherland. « Physical Conditions in the Seyfert Galaxy NGC 2992 ». Astrophysical Journal 511, no 2 (février 1999) : 686–708. http://dx.doi.org/10.1086/306718.

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Beckmann, V., N. Gehrels et J. Tueller. « The 1–200 keV X‐Ray Spectrum of NGC 2992 and NGC 3081 ». Astrophysical Journal 666, no 1 (septembre 2007) : 122–27. http://dx.doi.org/10.1086/519486.

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Veilleux, S., P. L. Shopbell et S. T. Miller. « The Biconical Outflow in the Seyfert Galaxy NGC 2992 ». Astronomical Journal 121, no 1 (janvier 2001) : 198–209. http://dx.doi.org/10.1086/318046.

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Yaqoob, Tahir, Kendrah D. Murphy et Yuichi Terashima. « An accretion disk laboratory in the Seyfert 1.9 galaxy NGC 2992 ». Proceedings of the International Astronomical Union 2, S238 (août 2006) : 123–26. http://dx.doi.org/10.1017/s1743921307004826.

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AbstractOver twenty five years of X-ray observations of the Seyfert 1.9 galaxy NGC 2992 show that it is a promising test-bed for severely constraining accretion disk models. The previous interpretation of the historical activity of NGC 2992 in terms of the accretion disk slowly becoming dormant over many years and then ‘re-building’ itself is not supported by new data. A recent year-long monitoring campaign with RXTE showed that the X-ray continuum varied by more than an order of magnitude on a timescale of weeks. During the large-amplitude flares the centroid energy of the Fe K emission-line complex became significantly redshifted, indicating that the violent activity was occurring close to the putative central black hole where gravitational energy shifts can be sufficiently large. For the continuum, the Compton-y parameter remains roughly constant despite the large-amplitude luminosity variability, with (kT) τ ∼ 20–50.
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Colina, L., K. J. Fricke, W. Kollatschny et M. A. C. Perryman. « Extended Line Emitting Regions in the Seyfert Galaxy NGC 2992 ». Symposium - International Astronomical Union 121 (1987) : 131–33. http://dx.doi.org/10.1017/s0074180900155020.

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NGC 2992 is a nearby Seyfert galaxy (z=0.008, 1″=150 pc, for HO=75 km s−1 Mpc−1) seen almost edge-on (i=70°). A dust lane crossing the galaxy has been detected (Burbidge et al. 1972, see also Fig. 1) and the presence of two extended radio-emitting regions at position angles P.A. 130° and P.A. 160° has been reported (Ulvestad and Wilson, 1984).
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Friedrich, S., R. I. Davies, E. K. S. Hicks, H. Engel, F. Müller-Sánchez, R. Genzel et L. J. Tacconi. « Adaptive optics near infrared integral field spectroscopy of NGC 2992 ». Astronomy and Astrophysics 519 (septembre 2010) : A79. http://dx.doi.org/10.1051/0004-6361/200913924.

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Lösch, Elismar, et Daniel Ruschel-Dutra. « Testing the link between mergers and AGN in the Arp 245 system ». Proceedings of the International Astronomical Union 15, S359 (mars 2020) : 192–94. http://dx.doi.org/10.1017/s1743921320001842.

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AbstractGalaxy mergers are known to drive an inflow of gas towards galactic centers, potentia- lly leading to both star formation and nuclear activity. In this work we aim to study how a major merger event in the ARP 245 system is linked with the triggering of an active galactic nucleus (AGN) in the NGC galaxy 2992. We employed three galaxy collision numerical simulations and calculated the inflow of gas through four different concentric spherical surfaces around the galactic centers, estimating an upper limit for the luminosity of an AGN being fed the amount of gas crossing the innermost spherical surface. We found that these simulations predict reasonable gas inflow rates when compared with the observed AGN luminosity in NGC 2992.
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Kollatschny, W. « Merging Galaxies with Active Nuclei ». Symposium - International Astronomical Union 186 (1999) : 358. http://dx.doi.org/10.1017/s0074180900113051.

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Colbert, Edward J. M., David K. Strickland, Sylvain Veilleux et Kimberly A. Weaver. « Extranuclear X‐Ray Emission in the Edge‐on Seyfert Galaxy NGC 2992 ». Astrophysical Journal 628, no 1 (20 juillet 2005) : 113–28. http://dx.doi.org/10.1086/430734.

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Thèses sur le sujet "NGC 2992"

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Olofsson, Niklas, et Alice Törnqvist. « Aktielikviditet på Stockholmsbörsen och NGM - prissätts likviditet i aktiehandeln ? » Thesis, Högskolan i Gävle, Företagsekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29992.

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Syfte: Syftet är att undersöka om det finns ett samband mellan aktiers likviditet och avkastning. Metod: Vår studie består av en kvantitativ metod där vi med hjälp av databasen Eikon från Thomson Reuters samlat in finansiella data. Vi har sedan med hjälp av Excel sammanställt och gjort beräkningar och slutligen gjort korrelationstester i statistikprogrammet SPSS. Resultat och slutsats: Studien skiljer sig från tidigare forskningsresultat då ingen signifikant likviditetspremie kan fastställas vid årlig ombalansering av portföljerna. När portföljerna behåller samma aktier under hela tidsperioden (6 år) finner vi däremot att den minst likvida portföljen genererar betydligt högre avkastning jämfört med den mest likvida portföljen. Bidrag: Studiens teoretiska bidrag stärker tidigare forskningsresultat om att beta inte är ett komplett riskmått vad gäller illikvida aktier. Ingen likviditetspremie uppkommer då innehavsperioden är ett år men då vår innehavsperiod istället är sex år finner vi stora skillnader mellan vår minst respektive mest likvida portfölj. Studiens praktiska bidrag riktar sig till investerare och företagsledare. Investerare kan vid längre tidsperioder nyttja LM12 som en investeringsstrategi för att skapa en överavkastning och företagsledare kan undersöka nyttan med att öka likviditeten i företagets aktier för att sänka företagets WACC och därmed öka värdet på företaget.  Förslag till vidare forskning: För att studera aktielikviditeten vidare skulle andra innehavsperioder (längre än ett år) för portföljerna kunna undersökas. Att undersöka längre tidsperioder för studien hade också varit intressant för att undersöka hur likviditetspremien varierar över tid.
Aim: The aim is to examine if there is a relationship between the liquidity and return of common stocks.  Method: This study consists of quantitative research method in which we have collected financial data using the Eikon database from Thomson Reuters. We then compiled and made calculations using Excel and finally made correlation tests in the statistics program SPSS. Result and conclusion: The results from this study differs from previous research results since no significant liquidity premium could be determined while using annual rebalancing of the portfolios. When the portfolios held the same stocks for the entire period (6 years), we found that the least liquid portfolio generated significantly higher returns compared to the most liquid portfolio.  Contribution of the thesis: The study's theoretical contribution strengthens previous research results in that beta is not a complete risk measure in terms of illiquid shares. No liquidity premium arises when the holding period is one year, but when our holding period is instead six years, we find great differences between our least and most liquid portfolio. The practical contribution of the study is aimed at investors and business leaders. Investors can use LM12 as an investment strategy to create an excess return during long holding periods, and business leaders can examine the benefits of increasing the liquidity of the company's common stock to lower the company's WACC and hence increase the value of the company. Suggestion for future research: In order to study the liquidity premium further, other holding periods (longer than one year) for the portfolios could be investigated. Investigating longer time periods for the study would also be interesting to investigate how the liquidity premium varies over time.
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Venturi, Giacomo. « The impact of galactic outflows on their host galaxies through spatially resolved spectroscopy ». Doctoral thesis, 2019. http://hdl.handle.net/2158/1160629.

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The observed properties of galaxies and supermassive black holes (BH) at their centers suggest that there must be a non-gravitational feedback mechanism regulating their evolution. These are the discrepancy at low and high masses between the observed stellar mass function of galaxies and that predicted by ΛCDM models, the scaling relations between the mass of BHs and the velocity dispersion, mass and luminosity of the host galaxy spheroid and the similarity between BH growth and star formation cosmic histories. Models of galaxy formation and evolution in fact routinely include feedback from active galactic nuclei (AGN) and supernovae (SNe), which can successfully reproduce the observed properties cited above. Models consider the following two types of AGN feedback: the radiative mode (or quasar mode), that operates during a luminous AGN phase through winds powered by radiation pressure, and the kinetic (or radio) mode, in which kinetic energy is released by the AGN on longer timescales through relativistic jets, which heat the surrounding halo in galaxy clusters, thus preventing cooling and further accretion on the central galaxy, and consequently further star formation. So far, the clearest observational evidence of AGN feedback comes from the kinetic mode in massive central cluster galaxies. Radiative feedback is instead more elusive, and has been recently revealed in action only in a few luminous quasars around the peak of AGN activity history (z~2), where most powerful outflows are observed. However, it is not possible to study high-z quasar outflows on small spatial scales (<100 pc), being poorly-resolved or even unresolved in observations, due to their large distances. This can lead to systematics and uncertainties in the determination of outflow properties and forces to make some assumptions on them, which further increases the uncertainties on the outflow energetics and complicates the evaluation of the impact of outflows on host galaxies and the comparison with models. On the contrary, due to their vicinity, nearby active galaxies are ideal laboratories to explore in detail outflow properties, their formation and acceleration mechanisms, as well as the effects of AGN activity on host galaxies. This work focuses on investigating the properties of outflows in nearby Seyfert galaxies, the physical conditions of the ionized gas and the interplay between nuclear activity and star formation in the galaxy, thanks to the unprecedented combination of spatial and spectral coverage provided by the integral field spectrograph MUSE at the Very Large Telescope (VLT). We introduce our optically- and X-ray selected sample of nearby Seyferts, called MAGNUM survey. We present our MUSE emission-line flux and kinematic maps of the 10 objects we have analyzed so far, including a star-forming galaxy, NGC 6810, to study the properties of a starburst outflow for comparison as well. We map the ionized gas down to spatial scales as low as ~10 pc. We find ubiquitous ionization cones and outflows with various morphologies and extensions, from a few hundred pc to several kpc. We detect peculiar kinematic features suggestive of outflows with hollow-conical structures. We also identify enhanced linewidths perpendicular to radio jets, which point to a correlation between the presence of jets and perpendicular turbulent or outflowing gas motions. We then focus on a detailed multi-wavelength study of the ionized gas and outflow, in terms of physical properties, kinematics, and ionization mechanisms, in one specific galaxy of our sample, NGC 1365, from MUSE in optical band and Chandra satellite in X-rays. Here we map a kpc-scale biconical outflow ionized by the AGN prominent in [O III], while Hα emission traces star formation in a circumnuclear ring and along the bar of the galaxy. Soft X-rays are mostly due to thermal emission from the star-forming regions, but we manage to isolate the AGN photoionized component which matches the [O III] emission from MUSE. We map the mass outflow rate of the galactic ionized outflow, which matches that of the nuclear X-ray wind and then decreases with radius. The integrated mass outflow rate, kinetic energy rate, and outflow velocity are broadly consistent with the typical relations observed in more luminous AGN. We extend our analysis to the nearby star-forming galaxy NGC 6810, whose bipolar galactic ionized outflow we map with MUSE. We determine the dominant ionization mechanism in the outflow, its density and ionization parameter, discovering the first case of star formation occurring within an outflow in an unambiguously star-forming galaxy. We finally investigate with MUSE also the kinetic AGN feedback, by studying the ionized gas enshrouding the X-ray cavity inflated by radio jets around the massive radio-galaxy 3C 317 at the center of the local cluster Abell 2052. Thanks to MUSE capabilities, by mapping the warm gas filaments enshrouding the bubble we are able to directly measure the expansion velocity of the cavity, which usually is instead assumed or derived from indirect and model-dependent methods.
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Livres sur le sujet "NGC 2992"

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Vaasipagam, Kaappiya. Ngo - Ltte / Ngo - Ltte (கட்டுரைகள்). Notion Press, 2021.

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Shanti. Bīngdăo Yù : Le Cauchemar de Zlav Journaliste. Independently Published, 2021.

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Chapitres de livres sur le sujet "NGC 2992"

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Joshi, U. C., Rekha Jain et M. R. Deshpande. « Photopolarimetry of Seyfert Galaxies — NGC 2992, NGC 3081, NGC 3227 and IC 4329 A ». Dans Active Galactic Nuclei, 321–22. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_97.

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Colina, L., K. J. Fricke, W. Kollatschny et M. A. C. Perryman. « Extended Line Emitting Regions in the Seyfert Galaxy NGC 2992 ». Dans Observational Evidence of Activity in Galaxies, 131–33. Dordrecht : Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3851-9_19.

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Busko, I. C., et J. E. Steiner. « “On the Broad Hα Component of IC 5063, IC 5135 and NGC 2992” ». Dans Active Galactic Nuclei, 90–92. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_21.

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Brinks, Elias, Pierre-Alain Duc, Volker Springel, Barbara Pichardo, Peter Weilbacher et Felix Mirabel. « The Formation of Tidal Dwarf Galaxies in Interacting Systems : The Case of Arp 245 (NGC 2992/93) ». Dans The Evolution of Galaxies, 405–8. Dordrecht : Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-3313-7_97.

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Grosbøl, Preben J., David L. Block et Panos A. Patsis. « Azimuthal Distribution of Dust in NGC 2997 ». Dans The Opacity of Spiral Disks, 259–61. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0381-7_25.

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Grosbøl, Preben, H. Dottori et R. Gredel. « Young Stellar Clusters in the Southern Spiral Arm of NGC 2997 ». Dans Mapping the Galaxy and Nearby Galaxies, 326. New York, NY : Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-72768-4_62.

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Korak, Thomas, Thomas Plos et Michael Hutter. « Attacking an AES-Enabled NFC Tag : Implications from Design to a Real-World Scenario ». Dans Constructive Side-Channel Analysis and Secure Design, 17–32. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29912-4_2.

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« Chapter 2.8 NGK Insulators Ltd. » Dans Methods for Monitoring and Diagnosing the Efficiency of Catalytic Converters - A Patent-oriented Survey, 295–300. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)80955-5.

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« Chapter 1.10 NGK Spark Plug Co. » Dans Methods for Monitoring and Diagnosing the Efficiency of Catalytic Converters - A Patent-oriented Survey, 175–77. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)80940-3.

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Mittal, Prateek, et Kishalay Mitra. « Decomposition-Based Multi-Objective Optimization of Energy Noise Trade-Off in a Wind Farm ». Dans Handbook of Research on Emergent Applications of Optimization Algorithms, 177–205. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2990-3.ch008.

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A multi-objective optimization case study of maximization and minimization of energy generation and noise propagation is considered here. A novel hybrid methodology, as a combination of probabilistic variable decomposed multi-objective evolutionary algorithm (VdRBNSGA-II) and the newly developed deterministic gradient based Pareto frontier construction approach (nD-NNC), has been proposed to determine the optimum layout of turbines (numbers and locations) inside a wind farm. In contrast to previous case studies, the proposed approach is able to yield the alternative energy-noise solutions along with the additional information on corresponding turbine layouts (numbers and locations) on a single Pareto front. As a result, it provides a decision maker with an ample of choices to choose from different competing solutions based on the existing standards and guidelines.
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Actes de conférences sur le sujet "NGC 2992"

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Yarger, James G., Steven Weitman, Steven Weitman, Bernd Meibohm, Stephen Gately et Steven Nye. « Abstract 2922 : NDC-1308 inhibits growth of lung and pancreatic tumors in vivo by blocking chromosome replication of cancer cells ». Dans Proceedings : AACR 101st Annual Meeting 2010‐‐ Apr 17‐21, 2010 ; Washington, DC. American Association for Cancer Research, 2010. http://dx.doi.org/10.1158/1538-7445.am10-2922.

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Rapports d'organisations sur le sujet "NGC 2992"

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Prada Forero, Luz Esperanza, et Ximena López González. Diversificación de productos : agroindustrialización del sabajón de guayaba. Corporación colombiana de investigación agropecuaria - AGROSAVIA, 2021. http://dx.doi.org/10.21930/agrosavia.video.2021.4.

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Agrosavia ofrece a productores y agroindustriales e inversionistas el sabajón de guayaba. El proceso cuenta con tecnología asequible de baja inversión del que se obtiene una bebida alcohólica con una aceptación del 92% formulada y estandarizada por la NTC 2972.
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