Studies of molecular clouds at the Galactic centre Roland Karlsson DECLINATION (B1950)
... winding of the spiral arms. However, intermediate classes also occur. A socalled grand design spiral galaxy is one where the spiral arms are well-defined. It is generally assumed that a central supermassive black hole (SMBH) resides at the dynamical centre of most spiral galaxies. Galaxies are obser ...
... winding of the spiral arms. However, intermediate classes also occur. A socalled grand design spiral galaxy is one where the spiral arms are well-defined. It is generally assumed that a central supermassive black hole (SMBH) resides at the dynamical centre of most spiral galaxies. Galaxies are obser ...
Reassessing the formation of the inner Oort cloud
... We re-examine the formation of the inner Oort comet cloud while the Sun was in its birth cluster with the aid of numerical simulations. This work is a continuation of an earlier study (Brasser et al., 2006) with several substantial modifications. First, the system consisting of stars, planets and co ...
... We re-examine the formation of the inner Oort comet cloud while the Sun was in its birth cluster with the aid of numerical simulations. This work is a continuation of an earlier study (Brasser et al., 2006) with several substantial modifications. First, the system consisting of stars, planets and co ...
Variations in the Star Formation Efficiency of the Dense Molecular
... It is not yet fully understood how the properties of molecular gas clouds affect their ability to form stars. A strong relation between gas density15 (n) and star formation is expected, because denser gas pockets will be more prone to collapse and will collapse more quickly. A key method to test thi ...
... It is not yet fully understood how the properties of molecular gas clouds affect their ability to form stars. A strong relation between gas density15 (n) and star formation is expected, because denser gas pockets will be more prone to collapse and will collapse more quickly. A key method to test thi ...
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 ...
On the elemental abundance and isotopic mixture of mercury in
... Spectra taken with the EMMI spectrograph at the 3.5 m NTT telescope cover a large wavelength interval (4070– 6740 Å) at a resolving power of R ∼ 80 000 and S/N ∼ 100. The spectrum of AV Scl was taken with the UVES spectrograph at the 8.0 m VLT. The UVES is a two-arm crossdispersed echelle spectrogra ...
... Spectra taken with the EMMI spectrograph at the 3.5 m NTT telescope cover a large wavelength interval (4070– 6740 Å) at a resolving power of R ∼ 80 000 and S/N ∼ 100. The spectrum of AV Scl was taken with the UVES spectrograph at the 8.0 m VLT. The UVES is a two-arm crossdispersed echelle spectrogra ...
Stars: Intro & Classification Astronomy 1 — Elementary Astronomy LA Mission College
... We intentionally do not suggest that there is a simple mechanism for accomplishing this and we avoid the concept of filters. ...
... We intentionally do not suggest that there is a simple mechanism for accomplishing this and we avoid the concept of filters. ...
Celestial Navitation - National University of Singapore
... and the North Star (Polaris), they were able to determine directions and estimated distances from the time it took to cover them. Thus they created simple charts and knew a basic form of dead reckoning (see instruments). Celestial Navigation ...
... and the North Star (Polaris), they were able to determine directions and estimated distances from the time it took to cover them. Thus they created simple charts and knew a basic form of dead reckoning (see instruments). Celestial Navigation ...
here - Ira-Inaf
... the Solar Circle, defined as the circular orbit whose radius is that of the distance of the Sun from the Galactic Center, commonly denoted as Ro. In 1985, the International Astronomical Union recommended that a value of 8.5 kpc be adopted for Ro (Kerr and Lynden-Bell, 1986), though more recent work ...
... the Solar Circle, defined as the circular orbit whose radius is that of the distance of the Sun from the Galactic Center, commonly denoted as Ro. In 1985, the International Astronomical Union recommended that a value of 8.5 kpc be adopted for Ro (Kerr and Lynden-Bell, 1986), though more recent work ...
Angular Momentum Evolution of Young Low
... 1. Very-low-mass objects at young ages show a wide range of periods, similar to more massive stars, from a few hours up to at least 2 weeks. 2. In all these samples there is a consistent trend of faster rotation toward lower masses. In the ONC, the median period drops from 5 d for M > 0.4 M⊙ to 2.6 ...
... 1. Very-low-mass objects at young ages show a wide range of periods, similar to more massive stars, from a few hours up to at least 2 weeks. 2. In all these samples there is a consistent trend of faster rotation toward lower masses. In the ONC, the median period drops from 5 d for M > 0.4 M⊙ to 2.6 ...
The environment of high-redshift AGN OLIMPIA JUDIT FOGASY
... In order to understand the formation and evolution of local massive galaxies and to reveal the processes that engineered the tight correlations found between their supermassive black hole (SMBH) mass and bulge mass or velocity dispersion, the study of powerful, high-redshift active galactic nuclei ( ...
... In order to understand the formation and evolution of local massive galaxies and to reveal the processes that engineered the tight correlations found between their supermassive black hole (SMBH) mass and bulge mass or velocity dispersion, the study of powerful, high-redshift active galactic nuclei ( ...
A cold detached dust envelope around an oxygen-rich Mira
... Four cases can be considered in order to explain the red 1n M stars. (1) The red colors of the infrared continuum can be observed if the stellar photosphere has an intrinsic infrared excess. No circumstellar matter is required in this case. But, it is very difficult to explain the infrared excess of ...
... Four cases can be considered in order to explain the red 1n M stars. (1) The red colors of the infrared continuum can be observed if the stellar photosphere has an intrinsic infrared excess. No circumstellar matter is required in this case. But, it is very difficult to explain the infrared excess of ...
The spectroscopic Hertzsprung
... The near proportionality of L to the Eddington factor implies a fundamental difference between the sHR and the HR or the g − T eff diagrams. In contrast to the last two, the sHR diagram has an impenetrable upper limit, i.e., the Eddington limit. For example, since for large mass the mass-luminosity ...
... The near proportionality of L to the Eddington factor implies a fundamental difference between the sHR and the HR or the g − T eff diagrams. In contrast to the last two, the sHR diagram has an impenetrable upper limit, i.e., the Eddington limit. For example, since for large mass the mass-luminosity ...
Jul y 9- 11,
... central supermassive black holes (SMBHs) will be more often present even in smaller galaxies when seeds are generated from the remnants of the first massive stars rather than via direct gas collapse. Consequently, measurement of the local occupation fraction provides an observational discriminator b ...
... central supermassive black holes (SMBHs) will be more often present even in smaller galaxies when seeds are generated from the remnants of the first massive stars rather than via direct gas collapse. Consequently, measurement of the local occupation fraction provides an observational discriminator b ...
Astronomy Laboratory Manual
... from the map's edge to center corresponds to craning your gaze from horizontal to straight up. There's only one way to get to know a map like this. Hold it out in front of you as you face the horizon. Twist it around so the map edge labeled with the direction you're facing is down. The correct horiz ...
... from the map's edge to center corresponds to craning your gaze from horizontal to straight up. There's only one way to get to know a map like this. Hold it out in front of you as you face the horizon. Twist it around so the map edge labeled with the direction you're facing is down. The correct horiz ...
Standardized Test Prep Chapter 30 Multiple Choice, continued
... Distances to Stars • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in lightyears. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s ...
... Distances to Stars • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in lightyears. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.