Results 161 to 170 of about 709,246 (279)
Shape constrained estimators in inverse regression models with convolution-type operator [PDF]
In this paper we are concerned with shape restricted estimation in inverse regression problems with convolution-type operator. We use increasing rearrangements to compute increasingand convex estimates from an (in principle arbitrary) unconstrained ...
Bissantz, Nicolai, Birke, Melanie
core
The Astronomical JournalVV 191 is a nearby ( z ∼ 0.05), overlapping (occulting) galaxy pair, where a multiple-armed spiral galaxy is backlit by an elliptical galaxy. The overlap is used to derive and map dust attenuation in two James Webb Space Telescope NIRCam filters (F090W ...
Clayton D. Robertson +10 more
doaj +1 more source
CAPM and Option Pricing with Elliptical Disbributions [PDF]
In this paper, we offer an alternative proof of the Capital Asset Pricing Model when the returns follow a multivariate elliptical distribution. Empirical studies continue to demonstrate the inappropriateness of the normality assumption in modelling asset
E. Valdez, Mahmoud Hamada
core
Stellar Population Synthesis of the Elliptical Galaxy NGC 4649 [PDF]
Journal of Astronomy and Space Sciences, 2001 We investigated population of the elliptical galaxy NGC 4649 using the spectral synthesis technique based on the linear program in the spectral regions between 3160Å to 10800Å. We used the spectral data of stars obtained by Gunn & Stryker (1983), and the
Mun-Suk Chun +2 more
doaj
Elliptical galaxies: fundamental relations, environmental effects and peculiar motions [PDF]
, 1993 This thesis investigates the reliability of the D - σ and D - Mg(_2) distance indicators for elliptical galaxies. In particular, we test whether these empirical correlations are affected by differences in the stellar populations of elliptical galaxies ...
Llorente, R.G, Llorente, Rafael Guzmán
core
BL Lac Host Galaxies: How to Systematically Characterize Them in Optical–Near-infrared Spectroscopy
The Astrophysical JournalHost galaxies of active galactic nuclei (AGN) give crucial information on the interaction between accreting supermassive black holes and their surroundings and on their common evolution.
Gaia Delucchi +5 more
doaj +1 more source
Spectral analysis of the elliptical galaxy NGC 7796 with suzaku
Journal of Radiation Research and Applied SciencesWe report Suzaku X-ray spectral analysis of the elliptical galaxy NGC 7796. We found the temperature and the abundances of O (∼0.54 keV), Ne (∼0.87 keV), Mg (∼1.30 keV), Si (∼1.84 keV), (hearafter O–Si), and Fe (∼6.4 keV) in the NGC 7796 for the first ...
Ebru Aktekin Çalışkan
doaj +1 more source
Compact Elliptical Galaxies [PDF]
, 2015 In this thesis, a sample of nearby, compact, elliptical galaxies with high central stellar velocity dispersions are studied. By means of high quality photometric and spectroscopic observations, we analyse their structural properties and construct state-of-the-art orbit-based dynamical models to constrain their total mass budgets, including the ...
openaire +1 more source
Clustering and redshift-space distortions in QSO and galaxy surveys [PDF]
, 2006 In this thesis, we exploit the potential of existing QSO and galaxy surveys for investigating the nature of the large scale structure in the Universe. A detailed analysis of clustering and redshift- space distortions allows us to constrain cosmological ...
Cruz da Angela, José Antonio +1 more
core
No Evidence of a Dichotomy in the Elliptical Galaxy Population
The Astrophysical JournalThe advent of large integral field spectroscopic surveys has found that elliptical galaxies (EGs) can be divided into two classes: the fast rotators (whose kinematics are dominated by rotation) and the slow rotators (which exhibit slow or no rotation ...
Rogério Monteiro-Oliveira +5 more
doaj +1 more source