Amazon S3
... In recent years astronomers have discovered that dwarf galaxies such as NGC 5234 are far more common than previously supposed. Moreover these galaxies are very different from their bigger cousins: they spend billions of years in a dormant state, then erupt in furious short-lived bursts of star form ...
... In recent years astronomers have discovered that dwarf galaxies such as NGC 5234 are far more common than previously supposed. Moreover these galaxies are very different from their bigger cousins: they spend billions of years in a dormant state, then erupt in furious short-lived bursts of star form ...
Spectral line mapping of the Milky Way
... will be ' 0.49 square degrees (a mapping of the southern Milky Way with |b| < 3◦ and dec < 40◦ requires ' 3000 individual pointings). Other lines at higher frequencies would be better observed commensally with radio continuum surveys, in a similar way as the MeerGal survey will do at ' 14 GHz using ...
... will be ' 0.49 square degrees (a mapping of the southern Milky Way with |b| < 3◦ and dec < 40◦ requires ' 3000 individual pointings). Other lines at higher frequencies would be better observed commensally with radio continuum surveys, in a similar way as the MeerGal survey will do at ' 14 GHz using ...
Sterrenstelsels en Cosmologie Docent: M. Franx, kamer 425
... You can see that the outer parts of the galaxies shown above show a straight profile - hence have an exponential profile. The inside shows an upturn, and that is modeled as a separate component. This is the bulge. Many galaxies are modelled well by fitting an r1/4 law to the bulge and an exponential ...
... You can see that the outer parts of the galaxies shown above show a straight profile - hence have an exponential profile. The inside shows an upturn, and that is modeled as a separate component. This is the bulge. Many galaxies are modelled well by fitting an r1/4 law to the bulge and an exponential ...
Populations of Galaxies and their Formation at z < 7
... integrated stellar mass in the universe increases gradually throughout this time suggesting that galaxy formation does not happen all at once. 3. Galaxies at high redshifts are peculiar and are likely undergoing mergers. The transition from mergers to normal Hubble types occurs at about z~1.5. Calcu ...
... integrated stellar mass in the universe increases gradually throughout this time suggesting that galaxy formation does not happen all at once. 3. Galaxies at high redshifts are peculiar and are likely undergoing mergers. The transition from mergers to normal Hubble types occurs at about z~1.5. Calcu ...
CH. 7 - science1d
... With enough time and a fast enough spacecraft to transport us on this imaginary journey, we would eventually travel among the stars. The next nearest star to Earth after the Sun is actually part of a group of three stars that orbit each other. This group is called the Centauri system (Figure 7.8). I ...
... With enough time and a fast enough spacecraft to transport us on this imaginary journey, we would eventually travel among the stars. The next nearest star to Earth after the Sun is actually part of a group of three stars that orbit each other. This group is called the Centauri system (Figure 7.8). I ...
Chapter 26.2 notes
... Distance to the Stars With the invention of the telescope, astronomers could measure the positions of stars with much greater accuracy. • The closer a star is to Earth, the greater is its parallax. • Astronomers have measured the parallax of many nearby stars and determined their distances from Eart ...
... Distance to the Stars With the invention of the telescope, astronomers could measure the positions of stars with much greater accuracy. • The closer a star is to Earth, the greater is its parallax. • Astronomers have measured the parallax of many nearby stars and determined their distances from Eart ...
Lecture1-1
... The actual measured data (left) and constructed models (model) are compared on the Dn(4000), HdA index plane. The solid lines in the left panels are tracks of burst star formation model and the points are “continuus” star formation model. ...
... The actual measured data (left) and constructed models (model) are compared on the Dn(4000), HdA index plane. The solid lines in the left panels are tracks of burst star formation model and the points are “continuus” star formation model. ...
CONSTELLATION TAURUS, THE BULL The Taurus constellation
... Taurus also has a number of famous deep sky objects, among This is a mosaic image of the Crab Nebula, a six-light-year-wide remnant them Messier 1 (the Crab Nebula), Hind’s Variable Nebula of a star’s supernova explosion in 1054, a 1000 years ago. The orange are the tattered remains of the star and ...
... Taurus also has a number of famous deep sky objects, among This is a mosaic image of the Crab Nebula, a six-light-year-wide remnant them Messier 1 (the Crab Nebula), Hind’s Variable Nebula of a star’s supernova explosion in 1054, a 1000 years ago. The orange are the tattered remains of the star and ...
26.2 Stars - Clinton Public Schools
... Distance to the Stars With the invention of the telescope, astronomers could measure the positions of stars with much greater accuracy. • The closer a star is to Earth, the greater is its parallax. • Astronomers have measured the parallax of many nearby stars and determined their distances from Eart ...
... Distance to the Stars With the invention of the telescope, astronomers could measure the positions of stars with much greater accuracy. • The closer a star is to Earth, the greater is its parallax. • Astronomers have measured the parallax of many nearby stars and determined their distances from Eart ...
The First Stars in the Universe - Scientific American
... temperature and inversely proportional to the square root of the gas pressure. The first star-forming systems would have had pressures similar to those of present-day molecular clouds. But because the temperatures of the first collapsing gas clumps were almost 30 times higher than those of molecula ...
... temperature and inversely proportional to the square root of the gas pressure. The first star-forming systems would have had pressures similar to those of present-day molecular clouds. But because the temperatures of the first collapsing gas clumps were almost 30 times higher than those of molecula ...
Deep HST Imaging of M33: Reliability and Recovery of the Star
... are assembled is key Star formation histories record the buildup of stellar mass: include history of star formation rate, history of metallicity distribution, history of stellar mass distribution (IMF) Understanding star formation is key: it’s a critical aspect of galaxy formation that is not curren ...
... are assembled is key Star formation histories record the buildup of stellar mass: include history of star formation rate, history of metallicity distribution, history of stellar mass distribution (IMF) Understanding star formation is key: it’s a critical aspect of galaxy formation that is not curren ...
ies la arboleda – centro tic - plurilingüe
... (A)- The universe was contained in a single point in space. All of the matter and energy of space was then contained at this point. What existed prior to this event is completely unknown. About 13.73 billion years (13.730.000.000 years) ago a tremendous explosion started the expansion of the univers ...
... (A)- The universe was contained in a single point in space. All of the matter and energy of space was then contained at this point. What existed prior to this event is completely unknown. About 13.73 billion years (13.730.000.000 years) ago a tremendous explosion started the expansion of the univers ...
Small Wonders: Taurus
... As to the naked eye sightings of lage numbers of the Pleiades, what may complicate the matter is the debate over the visibility of the nebulosity that runs throughout M45. Some say it's easily visible, others think it's not and what people are actually seeing and taking for nebulosity is the light o ...
... As to the naked eye sightings of lage numbers of the Pleiades, what may complicate the matter is the debate over the visibility of the nebulosity that runs throughout M45. Some say it's easily visible, others think it's not and what people are actually seeing and taking for nebulosity is the light o ...
PPT presentation
... • Many extended sources, presumably star formation regions at low redshift. Those pose no confusion problem because of their extended nature. • Two point sources bright in the on-band and fainter but visible in the offband. Could be high-z quasars or star forming regions or even a PN within a globul ...
... • Many extended sources, presumably star formation regions at low redshift. Those pose no confusion problem because of their extended nature. • Two point sources bright in the on-band and fainter but visible in the offband. Could be high-z quasars or star forming regions or even a PN within a globul ...
SM_Taurus - Cloudy Nights
... As to the naked eye sightings of lage numbers of the Pleiades, what may complicate the matter is the debate over the visibility of the nebulosity that runs throughout M45. Some say it's easily visible, others think it's not and what people are actually seeing and taking for nebulosity is the light o ...
... As to the naked eye sightings of lage numbers of the Pleiades, what may complicate the matter is the debate over the visibility of the nebulosity that runs throughout M45. Some say it's easily visible, others think it's not and what people are actually seeing and taking for nebulosity is the light o ...
Signs of the Zodiac: Capricorn
... cluster approximately 28,000 light years distant and about 90 light years across in size. The cluster is approaching us at the speed of 181.9 km/s. It was one of the first deep sky objects discovered by Charles Messier in 1764. The cluster has an overall spectral type F3. M30 is relatively dense and ...
... cluster approximately 28,000 light years distant and about 90 light years across in size. The cluster is approaching us at the speed of 181.9 km/s. It was one of the first deep sky objects discovered by Charles Messier in 1764. The cluster has an overall spectral type F3. M30 is relatively dense and ...
Ay 20 - Lecture 3: Astronomical Instruments and Measurements
... or: How good is that measurement? • S/N = signal/error (If the noise is Gaussian, we speak of 3-s, 5- s, … detections. This translates into a probability that the detection is spurious.) • For a counting process (e.g., photons), error = √n, and thus S/N = n / √n = √n (“Poissonian noise”). This is th ...
... or: How good is that measurement? • S/N = signal/error (If the noise is Gaussian, we speak of 3-s, 5- s, … detections. This translates into a probability that the detection is spurious.) • For a counting process (e.g., photons), error = √n, and thus S/N = n / √n = √n (“Poissonian noise”). This is th ...
Stars PowerPoint
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
... – A binary star is two stars that are gravitationally bound together and that orbit a common center of mass. – More than half of the stars in the sky are either binary stars or members of multiple-star systems. – Astronomers are able to identify binary stars through several methods. • Accurate measu ...
An introduce of the spectrograph of the GALEX
... (...) The data show a compellingly consistent picture of the SFH out to redshift z~6, with especially tight constraints for z<~1. We fit these data with simple analytical forms and derive conservative uncertainties. Since the z<~1 SFH data are quite precise, we investigate the sequence of assumption ...
... (...) The data show a compellingly consistent picture of the SFH out to redshift z~6, with especially tight constraints for z<~1. We fit these data with simple analytical forms and derive conservative uncertainties. Since the z<~1 SFH data are quite precise, we investigate the sequence of assumption ...
Finding What`s Up There Part1
... Celestial charts are maps of the sky drawn to different levels of detail. They can include stars from magnitude 5 to magnitude11. They have advantages and disadvantages. Magnitude 5 or 6 charts show a bigger portion of the sky than more detailed charts and make navigating the sky easier. Magnitude 9 ...
... Celestial charts are maps of the sky drawn to different levels of detail. They can include stars from magnitude 5 to magnitude11. They have advantages and disadvantages. Magnitude 5 or 6 charts show a bigger portion of the sky than more detailed charts and make navigating the sky easier. Magnitude 9 ...
Star Magnitude - ScienceEducationatNewPaltz
... With the invention of the telescope and modern equipment to measure star magnitudes the scale has been extended in both directions. Dimmer stars are assigned magnitudes larger than 6 ( 6, 7, 8, 9, ... 30th ... etc.) The Hubble Space Telescope Deep Field image contains some galaxies as faint as 30th ...
... With the invention of the telescope and modern equipment to measure star magnitudes the scale has been extended in both directions. Dimmer stars are assigned magnitudes larger than 6 ( 6, 7, 8, 9, ... 30th ... etc.) The Hubble Space Telescope Deep Field image contains some galaxies as faint as 30th ...
Asymmetric Star Formation Efficiency Due to Ram Pressure Stripping
... matter haloes, depending on how they have cooled and whether they reach a density greater than a certain threshold, they can be converted into star particles or not. The rate at which stars are formed is determined by the thermodynamic conditions of the medium. The simulations follow different feedb ...
... matter haloes, depending on how they have cooled and whether they reach a density greater than a certain threshold, they can be converted into star particles or not. The rate at which stars are formed is determined by the thermodynamic conditions of the medium. The simulations follow different feedb ...
Preview Sample 2
... Most of the atoms in our bodies (all the elements except for hydrogen, since our bodies generally do not contain helium) were made by stars well after the Big Bang. So most of what makes up our bodies was once part of stars. Light travels at 300,000 kilometers per second. A light-year is the distanc ...
... Most of the atoms in our bodies (all the elements except for hydrogen, since our bodies generally do not contain helium) were made by stars well after the Big Bang. So most of what makes up our bodies was once part of stars. Light travels at 300,000 kilometers per second. A light-year is the distanc ...
LSS-GAC – A LAMOST Spectroscopic Survey of the Galactic Anti
... statistical analysis of large samples of more distant galaxies (e.g. Mayer, Governato & Kaufmann 2008). Both approaches depend on the acquisition of large survey samples. The Milky Way is an archetypical disk galaxy and the only grand-design (barred) spiral that individual constituent stars can be r ...
... statistical analysis of large samples of more distant galaxies (e.g. Mayer, Governato & Kaufmann 2008). Both approaches depend on the acquisition of large survey samples. The Milky Way is an archetypical disk galaxy and the only grand-design (barred) spiral that individual constituent stars can be r ...
Microsoft Word 97
... of dust surrounding newly formed stars is easily observed from the ground and from infrared spacecraft. c) They found infrared radiation from so many stars in our galaxy that we think about one star forms in our galaxy each year. d) Since the interstellar gas is “invisible” in the visible part of th ...
... of dust surrounding newly formed stars is easily observed from the ground and from infrared spacecraft. c) They found infrared radiation from so many stars in our galaxy that we think about one star forms in our galaxy each year. d) Since the interstellar gas is “invisible” in the visible part of th ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.