Spiral arm structures revealed in the M31 galaxy
... Striking regularities are found in the northwestern arm of the M31 galaxy. Star complexes located in this arm are spaced 1.2 kpc apart and have similar sizes of about 0.6 kpc. This pattern is observed within the arm region where Beck et al. (1989) detected a strong regular magnetic field with the wa ...
... Striking regularities are found in the northwestern arm of the M31 galaxy. Star complexes located in this arm are spaced 1.2 kpc apart and have similar sizes of about 0.6 kpc. This pattern is observed within the arm region where Beck et al. (1989) detected a strong regular magnetic field with the wa ...
Submm Observations of Massive Star Formation in the Giant
... Context. How massive stars (M>8 M ) form and how they accrete gas is still an open research field, but it is known that their influence on the interstellar medium (ISM) is immense. Star formation involves the gravitational collapse of gas from scales of giant molecular clouds (GMCs) down to dense h ...
... Context. How massive stars (M>8 M ) form and how they accrete gas is still an open research field, but it is known that their influence on the interstellar medium (ISM) is immense. Star formation involves the gravitational collapse of gas from scales of giant molecular clouds (GMCs) down to dense h ...
Computer-generated holograms for three
... role. The remapping also eases the difficulty of creating object fields in wave-oriented methods. In this paper two techniques for synthesizing object fields in surface models are presented for creating 3-D images by use of computer-generated holograms. The first technique, based on the rotational t ...
... role. The remapping also eases the difficulty of creating object fields in wave-oriented methods. In this paper two techniques for synthesizing object fields in surface models are presented for creating 3-D images by use of computer-generated holograms. The first technique, based on the rotational t ...
Modeling Spatially and Spectrally Resolved Observations to
... This thesis owes much to the support of my officemate, Zach Berta, for five years of advice on life, computers, and astronomy. I thank Diego Muñoz, Robert Harris, Ragnhild Lunnan, and Sarah Rugheimer for countless snack and coffee breaks; Wen-fai Fong and Nick Stone for leading camping trips and t ...
... This thesis owes much to the support of my officemate, Zach Berta, for five years of advice on life, computers, and astronomy. I thank Diego Muñoz, Robert Harris, Ragnhild Lunnan, and Sarah Rugheimer for countless snack and coffee breaks; Wen-fai Fong and Nick Stone for leading camping trips and t ...
10-Jets and outflows
... There are possibly two distinct types of bipolar outflow. The ‘classical’ outflows, which dominated those found in the 1980s, are weakly collimated: wide relaxed-looking structures. The collimation factor, qcoll , defined as the ratio of the lengths of the major to minor axes, is used to distinguish ...
... There are possibly two distinct types of bipolar outflow. The ‘classical’ outflows, which dominated those found in the 1980s, are weakly collimated: wide relaxed-looking structures. The collimation factor, qcoll , defined as the ratio of the lengths of the major to minor axes, is used to distinguish ...
Document
... on the same torus will move onto two different tori. • However, if potential is changed very slowly compared to all characteristic times associated with the motion on each torus, all phase points that are initially on a given torus will be equally affected by the variation in Potential • Any two sta ...
... on the same torus will move onto two different tori. • However, if potential is changed very slowly compared to all characteristic times associated with the motion on each torus, all phase points that are initially on a given torus will be equally affected by the variation in Potential • Any two sta ...
PPT Poster - ARA
... 1: parameters that need to be improved; 2: 2nd priority; 3: 3d priority; Y: no problems clearly identified; ?: the databases have to be checked ...
... 1: parameters that need to be improved; 2: 2nd priority; 3: 3d priority; Y: no problems clearly identified; ?: the databases have to be checked ...
Abiotic formation of O2 and O3 in high
... All of the simulated planets were assumed to be devoid of life; hence, none of the compounds in the atmosphere was considered to have a biological source. As a reference, or “standard”, case we assumed a 1-bar, cloudless, “early-Earth” type atmosphere with 0.2 bar of CO2 . This is roughly the amount ...
... All of the simulated planets were assumed to be devoid of life; hence, none of the compounds in the atmosphere was considered to have a biological source. As a reference, or “standard”, case we assumed a 1-bar, cloudless, “early-Earth” type atmosphere with 0.2 bar of CO2 . This is roughly the amount ...
V. - Humboldt Digital Library
... of existing things, a small part of their genetic history is laid open. Different phases of the theory of the universe, attempts to comprehend the order of nature. Most ancient fundamental conception of the Hellenic mind: physiologic phantasies of the Ionian school, germs of the scientiSc contemplat ...
... of existing things, a small part of their genetic history is laid open. Different phases of the theory of the universe, attempts to comprehend the order of nature. Most ancient fundamental conception of the Hellenic mind: physiologic phantasies of the Ionian school, germs of the scientiSc contemplat ...
A systematic study of X-ray variability in the ROSAT all
... passes exactly through the center of the field of view; note that the scan speed was 3.75 arcmin/s. The exact length of a scan depends on the impact parameter b, which is defined as the nearest distance of a given source to the left (western) border of the detector during a given scan; the scan geom ...
... passes exactly through the center of the field of view; note that the scan speed was 3.75 arcmin/s. The exact length of a scan depends on the impact parameter b, which is defined as the nearest distance of a given source to the left (western) border of the detector during a given scan; the scan geom ...
K through 8
... way they appear in the sky but will appear correctly when observed through the viewer you will make.) Tape the constellation pattern (pattern outward) to the outside bottom of a film canister. Use a pushpin to poke a hole through the bottom of the film canister for each star in the constellation. Ma ...
... way they appear in the sky but will appear correctly when observed through the viewer you will make.) Tape the constellation pattern (pattern outward) to the outside bottom of a film canister. Use a pushpin to poke a hole through the bottom of the film canister for each star in the constellation. Ma ...
The skewness and kurtosis of the projected density distribution
... where W is the window function in k space. This variance can also be related to an area average over the two-point angular correlation (e.g. Gaztañaga 1994, hereafter G94). Note that this expression does not rely on perturbative calculation if the power spectrum that is used is the final one. It us ...
... where W is the window function in k space. This variance can also be related to an area average over the two-point angular correlation (e.g. Gaztañaga 1994, hereafter G94). Note that this expression does not rely on perturbative calculation if the power spectrum that is used is the final one. It us ...
Laser Cutting
... Laser Medium, with Mirrors direction and the same bouncing back and fourth off of each of the mirrors will happen to them also. Of course these new photons will themselves stimulate duplicates which will follow the same process. Now if both mirrors were perfectly reflective, this process would be a ...
... Laser Medium, with Mirrors direction and the same bouncing back and fourth off of each of the mirrors will happen to them also. Of course these new photons will themselves stimulate duplicates which will follow the same process. Now if both mirrors were perfectly reflective, this process would be a ...
Unravelling the Dark Matter - Dark Energy Paradigm
... We review here the minimal model for a dynamical 3-space. As well as the various confirmed gravitational predictions, there is also an extensive set of direct detection experiments, discussed in [9], with the most recent being from the analysis of NASA/JPL doppler shift data from spacecraft earth-fl ...
... We review here the minimal model for a dynamical 3-space. As well as the various confirmed gravitational predictions, there is also an extensive set of direct detection experiments, discussed in [9], with the most recent being from the analysis of NASA/JPL doppler shift data from spacecraft earth-fl ...
Extrasolar Cosmochemistry
... or exotic? Which, if any, extrasolar planetesimals experience differentiation? Externally polluted white dwarfs provide an opportunity to address these questions. After undergoing extensive evolution, stars with initial main-sequence masses less than eight times that of the Sun ultimately shed most ...
... or exotic? Which, if any, extrasolar planetesimals experience differentiation? Externally polluted white dwarfs provide an opportunity to address these questions. After undergoing extensive evolution, stars with initial main-sequence masses less than eight times that of the Sun ultimately shed most ...
SOFT X-RAY EMISSIONS FROM PLANETS, MOONS, AND COMETS
... Terrestrial x-rays were discovered in the 1950s. The launch of the first x-ray satellite UHURU in 1970 marked the beginning of satellite-based x-ray astronomy. Subsequently launched x-ray observatories - Einstein, and particularly Rontgensatellit (ROSAT), made important contributions to planetary x- ...
... Terrestrial x-rays were discovered in the 1950s. The launch of the first x-ray satellite UHURU in 1970 marked the beginning of satellite-based x-ray astronomy. Subsequently launched x-ray observatories - Einstein, and particularly Rontgensatellit (ROSAT), made important contributions to planetary x- ...
How Massive Single Stars End Their Life - TigerPrints
... Kalogera (2001) estimate 40 M, but calculations of explosions even in supernovae as light as 15 M give widely varying results. It is likely that stars up to at least 25 M do explode, by one means or another, in order that the heavy elements are produced in solar proportions. The number of stars b ...
... Kalogera (2001) estimate 40 M, but calculations of explosions even in supernovae as light as 15 M give widely varying results. It is likely that stars up to at least 25 M do explode, by one means or another, in order that the heavy elements are produced in solar proportions. The number of stars b ...
Constraints on Long-Period Planets from an L
... would be fascinating, we also need information about systems old enough to have settled down into a mature, stable configuration. To probe long-period planet populations in mature systems, surveys such as ours that target older stars are necessary. Additionally, theoretical spectra of older planets ...
... would be fascinating, we also need information about systems old enough to have settled down into a mature, stable configuration. To probe long-period planet populations in mature systems, surveys such as ours that target older stars are necessary. Additionally, theoretical spectra of older planets ...
On the interpretation of stellar disc observations in terms of diameters
... Case A: Bl T 1 @ Bl T 2 : This case occurs in a realistic atmosphere for steep temperature gradient and/or, usually more importantly, for l in the Wien part of the Planck function(s). (A1) For small to moderate radial optical thickness t l , the photons originating from the inner hot layer domi ...
... Case A: Bl T 1 @ Bl T 2 : This case occurs in a realistic atmosphere for steep temperature gradient and/or, usually more importantly, for l in the Wien part of the Planck function(s). (A1) For small to moderate radial optical thickness t l , the photons originating from the inner hot layer domi ...
A Simple Model for r-Process Scatter and Halo Evolution
... Recent years have shown that halo stars indeed give unique insight into the r-process. With the advent of high dispersion, high S/N measurements, the abundance observations within and among halo stars has led to surprising new discoveries with important consequences for theories of the r-process as ...
... Recent years have shown that halo stars indeed give unique insight into the r-process. With the advent of high dispersion, high S/N measurements, the abundance observations within and among halo stars has led to surprising new discoveries with important consequences for theories of the r-process as ...
Unit 1 test review and answer key 16
... Neptune can be seen only by observing through telescopes. 9. ANS: F The outer planets have large gaseous surfaces. 10. ANS: T 11. ANS: F Asteroids (not comets) move along the ecliptic in the same way as the planets do. 12. ANS: F The Jovian planets are Jupiter, Saturn, Uranus, and Neptune. 13. ANS: ...
... Neptune can be seen only by observing through telescopes. 9. ANS: F The outer planets have large gaseous surfaces. 10. ANS: T 11. ANS: F Asteroids (not comets) move along the ecliptic in the same way as the planets do. 12. ANS: F The Jovian planets are Jupiter, Saturn, Uranus, and Neptune. 13. ANS: ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.