The Ionization Structure of the Irregular Galaxy NGC 4449
... Ionization occurs when ultraviolet radiation from the star ionizes the hydrogen in the gas, converting it into a plasma of positive hydrogen ions (protons) and free electrons. Detached protons and electrons move around as free particles in the gas. Recombination takes place when a proton captures a ...
... Ionization occurs when ultraviolet radiation from the star ionizes the hydrogen in the gas, converting it into a plasma of positive hydrogen ions (protons) and free electrons. Detached protons and electrons move around as free particles in the gas. Recombination takes place when a proton captures a ...
Supplementary Information
... sample with a magnitude limit of Ks < 20 (Vega photometric system) in the wide Deep3a field and applying the so-called BzK colour selection (1, 2). This method is based on the z-Ks versus B-z colour-colour diagram, where the broad-band filters B, z and Ks are cantered at the observed wavelengths of ...
... sample with a magnitude limit of Ks < 20 (Vega photometric system) in the wide Deep3a field and applying the so-called BzK colour selection (1, 2). This method is based on the z-Ks versus B-z colour-colour diagram, where the broad-band filters B, z and Ks are cantered at the observed wavelengths of ...
Cosmic Distance Ladder
... Limits of Parallax Method • Refraction caused by the atmosphere limits the accuracy to 0.01 arcseconds. • d=1/p|d|=|p|/p2 • Reliable measurements, those with errors of 10% or less, can only be achieved at stellar distances of no more than about 100 pc. • Space-based telescopes are not limited by ...
... Limits of Parallax Method • Refraction caused by the atmosphere limits the accuracy to 0.01 arcseconds. • d=1/p|d|=|p|/p2 • Reliable measurements, those with errors of 10% or less, can only be achieved at stellar distances of no more than about 100 pc. • Space-based telescopes are not limited by ...
THE BIG BANG THEORY
... • 1960: spectroscopic studies of stars showed that the helium accounted for 20-30% of the mass of stars, the ...
... • 1960: spectroscopic studies of stars showed that the helium accounted for 20-30% of the mass of stars, the ...
Final Exam Space Unit Review
... 1. Combining Telescopes: Now powerful computers can combine images from 2 or more telescopes (interferometry). The two separate telescopes act like one large telescope the size of the total distance between the two telescopes! This provides great resolving power. The twin Keck telescopes in Hawaii h ...
... 1. Combining Telescopes: Now powerful computers can combine images from 2 or more telescopes (interferometry). The two separate telescopes act like one large telescope the size of the total distance between the two telescopes! This provides great resolving power. The twin Keck telescopes in Hawaii h ...
Spiral Elliptical Irregular - SMS 8th Grade Astronomy Unit
... The Earth’s Place in the Universe Earth is one of eight (+Pluto!) planets in the solar system We are __________________ million miles away from the sun This is called an Astronomical Unit (AU) (it would take a jet 17 years to travel this far!) Pluto is 39 AU from the sun…How many miles is that? ____ ...
... The Earth’s Place in the Universe Earth is one of eight (+Pluto!) planets in the solar system We are __________________ million miles away from the sun This is called an Astronomical Unit (AU) (it would take a jet 17 years to travel this far!) Pluto is 39 AU from the sun…How many miles is that? ____ ...
2.7 - 2.9a
... include the Milky Way (our galaxy) all have a central nucleus have long curved arms contain a lot of gas and dust ...
... include the Milky Way (our galaxy) all have a central nucleus have long curved arms contain a lot of gas and dust ...
The magnitude scale
... object in the sky using the magnitude scale. The scale is somewhat strange because brighter objects have smaller magnitudes, while fainter objects have larger magnitudes - the opposite of what you might expect. ...
... object in the sky using the magnitude scale. The scale is somewhat strange because brighter objects have smaller magnitudes, while fainter objects have larger magnitudes - the opposite of what you might expect. ...
GenGeoAstroII_Stars
... Question: What determines the velocity with which the sun is moving around the Galactic centre? ...
... Question: What determines the velocity with which the sun is moving around the Galactic centre? ...
The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL)
... and with the Herschel Hi-GAL data when they become available. Star formation triggered by expanding H ii regions The Spitzer–GLIMPSE images at 8 µm have unveiled a “bubbling Galactic disc”. More than 600 bubbles with diameters of a few arcminutes have been catalogued by Churchwell et al. (2006, 2007 ...
... and with the Herschel Hi-GAL data when they become available. Star formation triggered by expanding H ii regions The Spitzer–GLIMPSE images at 8 µm have unveiled a “bubbling Galactic disc”. More than 600 bubbles with diameters of a few arcminutes have been catalogued by Churchwell et al. (2006, 2007 ...
Chapter 18 Notes - Valdosta State University
... Anything (even light) coming within a limit called the event horizon is trapped and becomes part of the black hole. The distance from the center of the black hole to the event horizon is called the Schwarzschild radius. Black holes can only be detected by analyzing the electromagnetic radiation comi ...
... Anything (even light) coming within a limit called the event horizon is trapped and becomes part of the black hole. The distance from the center of the black hole to the event horizon is called the Schwarzschild radius. Black holes can only be detected by analyzing the electromagnetic radiation comi ...
Milky Way structure
... • What is the closest galaxy to the Milky Way? The new answer to this old question is the Canis Major dwarf galaxy. For many years astronomers thought the Large Magellan Cloud (LMC) was closest, but its title was supplanted in 1994 by the Sagittarius dwarf galaxy. Recent measurements ind ...
... • What is the closest galaxy to the Milky Way? The new answer to this old question is the Canis Major dwarf galaxy. For many years astronomers thought the Large Magellan Cloud (LMC) was closest, but its title was supplanted in 1994 by the Sagittarius dwarf galaxy. Recent measurements ind ...
Evolution of galaxy morphology - Lecture 1 - NCRA-TIFR
... they are the basic building blocks of the Universe on large scales they show a broad range in their physical properties Understanding of galaxy formation and evolution is one of the main outstanding problems in modern cosmology there are ∼ 1011 galaxies in the observable universe typical total mass ...
... they are the basic building blocks of the Universe on large scales they show a broad range in their physical properties Understanding of galaxy formation and evolution is one of the main outstanding problems in modern cosmology there are ∼ 1011 galaxies in the observable universe typical total mass ...
Big Universe, Big Data: Machine Learning and
... be captured at the same time, making it more expensive than photometry, which allows for acquiring images of thousands of objects in a single image. Photometry can capture objects that may be ten times fainter than what can be measured with spectroscopy. A faint galaxy is often more distant than a b ...
... be captured at the same time, making it more expensive than photometry, which allows for acquiring images of thousands of objects in a single image. Photometry can capture objects that may be ten times fainter than what can be measured with spectroscopy. A faint galaxy is often more distant than a b ...
Chapter 25 - Notes Super Size
... • Large group of stars, gas, and dust held together by _________________. -_________________ Galaxies- they have spiral arms that wind outward from the center. They can be normal or barred. -Elliptical Galaxies- common type of galaxy that are oval or_________________shaped. -Irregular Galaxies- ____ ...
... • Large group of stars, gas, and dust held together by _________________. -_________________ Galaxies- they have spiral arms that wind outward from the center. They can be normal or barred. -Elliptical Galaxies- common type of galaxy that are oval or_________________shaped. -Irregular Galaxies- ____ ...
space tech - Project Jugaad
... between the two positions from which it is observed, they can calculate the distance to the object. Using observations on Earth separated by thousands of miles -- like looking through two eyes that are very far apart -- parallax measurements can reveal the great distances to planets. Although he did ...
... between the two positions from which it is observed, they can calculate the distance to the object. Using observations on Earth separated by thousands of miles -- like looking through two eyes that are very far apart -- parallax measurements can reveal the great distances to planets. Although he did ...
Chapter 19 Notes Stars Stars are bright balls of gas that are trillions
... i. While many stars become white dwarves as they get older, very massive stars can become strange objects like pulsars, supernovas, black holes and neutron stars. ii. Supernovas 1. Massive stars use their hydrogen much faster than stars like the sun do. 2. At the end of their lives they may explode ...
... i. While many stars become white dwarves as they get older, very massive stars can become strange objects like pulsars, supernovas, black holes and neutron stars. ii. Supernovas 1. Massive stars use their hydrogen much faster than stars like the sun do. 2. At the end of their lives they may explode ...
Last Year`s Exam, Section B
... Globular clusters are very old The Hertzsprung-Russell diagrams of globular clusters have a long red giant branch but only the bottom end of the main sequence the higher up the main sequence a star is, the more massive it is and the shorter its main ...
... Globular clusters are very old The Hertzsprung-Russell diagrams of globular clusters have a long red giant branch but only the bottom end of the main sequence the higher up the main sequence a star is, the more massive it is and the shorter its main ...
star-formation rate
... Of particular importance is the spectral break located at about 4000 Å which becomes visible in the spectrum after a few 107 years. This break is caused by a strongly changing opacity of stellar atmospheres at this wavelength, mainly due to strong transitions of singly ionized calcium and the Balmer ...
... Of particular importance is the spectral break located at about 4000 Å which becomes visible in the spectrum after a few 107 years. This break is caused by a strongly changing opacity of stellar atmospheres at this wavelength, mainly due to strong transitions of singly ionized calcium and the Balmer ...
Test#4
... b) the planets accreted all the gas and dust c) the early Solar system was made up only of Hydrogen and Helium d) the Sun burns them up 19. All the planets outside our Solar system have been detected by a) Hubble Space Telescope b) Radar c) gravitation perturbations of spacecraft d) Doppler effects ...
... b) the planets accreted all the gas and dust c) the early Solar system was made up only of Hydrogen and Helium d) the Sun burns them up 19. All the planets outside our Solar system have been detected by a) Hubble Space Telescope b) Radar c) gravitation perturbations of spacecraft d) Doppler effects ...
1 - Northwest ISD Moodle
... identified Cepheid variables (a kind of star) in several spiral nebulae, including the Andromeda Nebula and Triangulum. Long after his death, the launching of the Hubble Space His observations, in 1922–1923, proved conclusively Telescope (namedmade in honor of Hubble) in 1990 on the Space that these ...
... identified Cepheid variables (a kind of star) in several spiral nebulae, including the Andromeda Nebula and Triangulum. Long after his death, the launching of the Hubble Space His observations, in 1922–1923, proved conclusively Telescope (namedmade in honor of Hubble) in 1990 on the Space that these ...
Hubble Deep Field
The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres. The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known. By revealing such large numbers of very young galaxies, the HDF has become a landmark image in the study of the early universe, with the associated scientific paper having received over 900 citations by the end of 2014.Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the Universe (the cosmological principle). A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra-Deep Field (HUDF), was constructed from a few months of light exposure. The HUDF image was at the time the most sensitive astronomical image ever made at visible wavelengths, and it remained so until the Hubble Extreme Deep Field (XDF) was released in 2012.