1 Globular Cluster Systems - McMaster Physics and Astronomy
... used by Shapley to estimate the centroid of the system and thus { again for the rst time { to determine the distance from the Sun to the Galactic center. The second graph shows us exactly the same plot with the most modern measurements. The data have improved dramatically over the intervening 80 ye ...
... used by Shapley to estimate the centroid of the system and thus { again for the rst time { to determine the distance from the Sun to the Galactic center. The second graph shows us exactly the same plot with the most modern measurements. The data have improved dramatically over the intervening 80 ye ...
Article PDF - IOPscience
... three-dimensional space. When trying to understand a galaxy from its stellar light distributions, and what it means physically, all of the above effects must be taken into account. The apparent distribution of stellar light in nearby bright galaxies quickly led to the Hubble classification system (Hub ...
... three-dimensional space. When trying to understand a galaxy from its stellar light distributions, and what it means physically, all of the above effects must be taken into account. The apparent distribution of stellar light in nearby bright galaxies quickly led to the Hubble classification system (Hub ...
Stellarium User Guide
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of
... translating the main sections of this book. The other objective was to try and point out the importance of this author and this book in the history of astronomy. I found that al-Ṣūfī’s ...
... translating the main sections of this book. The other objective was to try and point out the importance of this author and this book in the history of astronomy. I found that al-Ṣūfī’s ...
Full Text - Departement Natuurkunde en Sterrenkunde
... Een speciaal dankjewel voor de mensen die met mij de bureau gedeeld hebben: Bram, Maarten en Evelien. Bram, op de een of andere manier was je een bron van rust en wijsheid. Bedankt om die af en toe eens (al dan niet bewust) naar uw bureaugenootje door te stralen. Maarten, bedankt om mij op tijd en s ...
... Een speciaal dankjewel voor de mensen die met mij de bureau gedeeld hebben: Bram, Maarten en Evelien. Bram, op de een of andere manier was je een bron van rust en wijsheid. Bedankt om die af en toe eens (al dan niet bewust) naar uw bureaugenootje door te stralen. Maarten, bedankt om mij op tijd en s ...
The KStars Handbook - KDE Documentation
... From an object’s popup menu, you can open its Detailed Information Window, where you can examine positional data about the object, and query a huge treasury of online databases for professional-grade astronomical data and literature references about the object. You can even attach your own Internet ...
... From an object’s popup menu, you can open its Detailed Information Window, where you can examine positional data about the object, and query a huge treasury of online databases for professional-grade astronomical data and literature references about the object. You can even attach your own Internet ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... The bootstrapping method consists in drawing a large number of random samples from the initial distribution, allowing the same data to be drawn more than once. For example, the uncertainty in a quantity derived for a cloud containing 500 (x, y, v, t) pixels can be estimated by drawing 500 pixels ran ...
... The bootstrapping method consists in drawing a large number of random samples from the initial distribution, allowing the same data to be drawn more than once. For example, the uncertainty in a quantity derived for a cloud containing 500 (x, y, v, t) pixels can be estimated by drawing 500 pixels ran ...
THE HELIACAL RISE OF SIRIUS- Algorithm
... 18 Aug: spot sighting i.e. Sirius seen only for parts of the second 19 Aug: Heliacal Rise of Sirius (Morning First) Sirius seen easily. 21 Aug: first day with steady light ( from 5:28 to 5:34 ) Explanations to table 1: In column 2 : V: the visibility rated from 0 to 12. In column 3 : Time >: time of ...
... 18 Aug: spot sighting i.e. Sirius seen only for parts of the second 19 Aug: Heliacal Rise of Sirius (Morning First) Sirius seen easily. 21 Aug: first day with steady light ( from 5:28 to 5:34 ) Explanations to table 1: In column 2 : V: the visibility rated from 0 to 12. In column 3 : Time >: time of ...
Chapter 5 The Evolutionary Paths Of Nearby Galaxies
... Figure 5.5: The morphological type distribution of galaxies in the HRS+ sample (dotted histogram). The filled histogram represents galaxies in the transition region, while red and blue sequence galaxies are shown with the empty and dashed histogram, respectively. ...
... Figure 5.5: The morphological type distribution of galaxies in the HRS+ sample (dotted histogram). The filled histogram represents galaxies in the transition region, while red and blue sequence galaxies are shown with the empty and dashed histogram, respectively. ...
the stebbins galaxy: the origins of interstellar medium studies
... Shapley explicitly assumed that interstellar extinction was insignificant in applying his sequence of distance measures and that no systematic correction for it was necessary. He acknowledged, as was obvious, that there were dark, probably opaque clouds visible among the stars, but he considered the ...
... Shapley explicitly assumed that interstellar extinction was insignificant in applying his sequence of distance measures and that no systematic correction for it was necessary. He acknowledged, as was obvious, that there were dark, probably opaque clouds visible among the stars, but he considered the ...
THE UV-OPTICAL COLOR MAGNITUDE DIAGRAM. II. PHYSICAL
... quite clearly how the NUV r color covers a much wider magnitude range than g r. In addition, the g r color starts to saturate for red galaxies, while NUV r varies by more than 2 magnitudes. We see indications from these plots that rest-frame UV-optical colors correlate with Sersic index (and ...
... quite clearly how the NUV r color covers a much wider magnitude range than g r. In addition, the g r color starts to saturate for red galaxies, while NUV r varies by more than 2 magnitudes. We see indications from these plots that rest-frame UV-optical colors correlate with Sersic index (and ...
Stars, Galaxies, and Beyond
... Pearson/Addison Wesley, hereafter abbreviated IMA2. References herein to chapters refer to that textbook, but a great deal of information I have included under these chapter headings is from the lectures and especially from other sources, so may not have been stated as such in the textbook (nor have ...
... Pearson/Addison Wesley, hereafter abbreviated IMA2. References herein to chapters refer to that textbook, but a great deal of information I have included under these chapter headings is from the lectures and especially from other sources, so may not have been stated as such in the textbook (nor have ...
Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry
... provides an excellent environment in which to explore stellar populations and kinematic properties of low luminosity galaxies. At the same time, Virgo is dynamically young (e.g., Tully & Shaya 1984) and contains several substructural units (Binggeli et al. 1987); thus, with a well selected sample it ...
... provides an excellent environment in which to explore stellar populations and kinematic properties of low luminosity galaxies. At the same time, Virgo is dynamically young (e.g., Tully & Shaya 1984) and contains several substructural units (Binggeli et al. 1987); thus, with a well selected sample it ...
Rich
... Lyα Emitters Motivation • Issue: Lyα emission from galaxies is likely affected by a combination of dust extinction, gas kinematics, and spatial geometry but the order of importance of each of these is unknown, and may vary from galaxy to galaxy. • Opportunity: Galex grism mode in Far-UV (FUV) used ...
... Lyα Emitters Motivation • Issue: Lyα emission from galaxies is likely affected by a combination of dust extinction, gas kinematics, and spatial geometry but the order of importance of each of these is unknown, and may vary from galaxy to galaxy. • Opportunity: Galex grism mode in Far-UV (FUV) used ...
Digital Universe Guide - American Museum of Natural History
... Menu or by typing one of the shortcut keys (f, o, r, or t) in the Graphics Window. The active flight mode appears below the Flight Mode Menu. ...
... Menu or by typing one of the shortcut keys (f, o, r, or t) in the Graphics Window. The active flight mode appears below the Flight Mode Menu. ...
Local Group Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mario L Mateo
... plates identified new nearby galaxies. Starting in the 1970s, automated measurements and analyses of the plates from these surveys helped uncover nearly all of the most recently discovered Local Group members. However, even the most complete optical survey cannot find all of the galaxies in the sky. ...
... plates identified new nearby galaxies. Starting in the 1970s, automated measurements and analyses of the plates from these surveys helped uncover nearly all of the most recently discovered Local Group members. However, even the most complete optical survey cannot find all of the galaxies in the sky. ...
PDF file of document - University of Iowa Astrophysics
... guide your progress and test your understanding of the concepts discussed. Your score for the project will be determined by how well you answer these questions. If you are confused about questions as you progress, ask your lab instructor for assistance. Questions near the end of the project often bu ...
... guide your progress and test your understanding of the concepts discussed. Your score for the project will be determined by how well you answer these questions. If you are confused about questions as you progress, ask your lab instructor for assistance. Questions near the end of the project often bu ...
2. The X-ray-Radio correlation for bulgeless galaxies
... Table1: Sensitivity limits for the C-COSMOS Survey. The flux sensitivity of the surveys is the same regardless of the distance of the objects, so the luminosity limit is defined solely by the redshifts................................................................................................... ...
... Table1: Sensitivity limits for the C-COSMOS Survey. The flux sensitivity of the surveys is the same regardless of the distance of the objects, so the luminosity limit is defined solely by the redshifts................................................................................................... ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... number since our galaxy is the second largest in our local cluster of about 30 galaxies, and thus may be considered to be an exceptionally large galaxy. There are many more small galaxies of the elliptical or globular types than there are of the spiral type such as our Milky Way. The information on ...
... number since our galaxy is the second largest in our local cluster of about 30 galaxies, and thus may be considered to be an exceptionally large galaxy. There are many more small galaxies of the elliptical or globular types than there are of the spiral type such as our Milky Way. The information on ...
from z=0 to z=1
... IR/UV increases by ~ 4. This is consistent with the scenario that high z galaxies are more luminous therefore with higher attenuation. ...
... IR/UV increases by ~ 4. This is consistent with the scenario that high z galaxies are more luminous therefore with higher attenuation. ...
DUSTiNGS III: Distribution of Intermediate
... or not stellar populations extending to the outer extremities of galaxies are purely old populations (supporting in-situ star formation in a contracting gaseous disk) or a mix of intermediate-age and old stars (supporting a combination of in-situ star formation, internal drivers of extended structur ...
... or not stellar populations extending to the outer extremities of galaxies are purely old populations (supporting in-situ star formation in a contracting gaseous disk) or a mix of intermediate-age and old stars (supporting a combination of in-situ star formation, internal drivers of extended structur ...
Untitled - NMSU Astronomy
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
Malmquist bias
The Malmquist bias is an effect in observational astronomy which leads to the preferential detection of intrinsically bright objects. It was first described in 1922 by Swedish astronomer Gunnar Malmquist (1893–1982), who then greatly elaborated upon this work in 1925. In statistics, this bias is referred to as a selection bias and affects the survey results in a brightness limited survey, where stars below a certain apparent brightness are not included. Since observed stars and galaxies appear dimmer when farther away, the brightness that is measured will fall off with distance until their brightness falls below the observational threshold. Objects which are more luminous, or intrinsically brighter, can be observed at a greater distance, creating a false trend of increasing intrinsic brightness, and other related quantities, with distance. This effect has led to many spurious claims in the field of astronomy. Properly correcting for these effects has become an area of great focus.