Lab 14 Galaxy Morphology
... into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While many of these nebulae are clouds of glowing hydrogen gas within the Milky Way galaxy ...
... into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While many of these nebulae are clouds of glowing hydrogen gas within the Milky Way galaxy ...
Hands-On Activities
... universe and the concept of models in small groups. Participants with less experience with these concepts will require more time and guidance during the discussion part of the activity. 1. Before breaking into smaller groups, tell them they will have 3 minutes to brainstorm objects in the universe a ...
... universe and the concept of models in small groups. Participants with less experience with these concepts will require more time and guidance during the discussion part of the activity. 1. Before breaking into smaller groups, tell them they will have 3 minutes to brainstorm objects in the universe a ...
ALFALFA H-alpha: The Star-Formation-Rate Density
... The Wesleyan Astronomy Department includes the most exciting and supportive professors I have met. Their interest in the field was infectious and drew me in. One class in particular – John Salzer’s Introduction to Astronomical Techniques – converted me to an astronomy major. For this and two years’ ...
... The Wesleyan Astronomy Department includes the most exciting and supportive professors I have met. Their interest in the field was infectious and drew me in. One class in particular – John Salzer’s Introduction to Astronomical Techniques – converted me to an astronomy major. For this and two years’ ...
The redshift of extragalactic nebulae
... famous Einstein effect. It appeared, however, that it was not possible in this way to uncover rational relationships. E. HUBBLE then tried to correlate the redshift with the distance of different nebulae. This experiment has, as is well known, since then been crowned by great success. The nebulae wh ...
... famous Einstein effect. It appeared, however, that it was not possible in this way to uncover rational relationships. E. HUBBLE then tried to correlate the redshift with the distance of different nebulae. This experiment has, as is well known, since then been crowned by great success. The nebulae wh ...
lecture course
... somewhat less secure than for stars. This is in part due to the extreme conditions near these very massive black holes of 106 to 109 solar masses, which is quite unlike anything we can test in laboratories on Earth (we are in the strong field limit of general relativity). On the other hand, atomic s ...
... somewhat less secure than for stars. This is in part due to the extreme conditions near these very massive black holes of 106 to 109 solar masses, which is quite unlike anything we can test in laboratories on Earth (we are in the strong field limit of general relativity). On the other hand, atomic s ...
Hidden57_rf
... orbiting observatories have produced a wondrous and often breathtakingly beautiful view of a Universe whose richness could not have been imagined. A string of new discoveries has come from this fleet of new space-based instruments and observatories, and each new insight has been firmly placed into t ...
... orbiting observatories have produced a wondrous and often breathtakingly beautiful view of a Universe whose richness could not have been imagined. A string of new discoveries has come from this fleet of new space-based instruments and observatories, and each new insight has been firmly placed into t ...
ROTATION CURVES OF HIGH-LUMINOSITY SPIRAL GALAXIES
... level, A = -B is not excluded, i.e., the rotation curve could be flat in the solar vicinity. More likely, there is a negative velocity gra dient at the position of the sun. Because spiral arms show positive velocity gradients, the sun is probably not located in a spiral arm. Lin ert al. (1977) conc ...
... level, A = -B is not excluded, i.e., the rotation curve could be flat in the solar vicinity. More likely, there is a negative velocity gra dient at the position of the sun. Because spiral arms show positive velocity gradients, the sun is probably not located in a spiral arm. Lin ert al. (1977) conc ...
Local Group Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mario L Mateo
... penetrate the haze of the Milky Way by detecting radiation that is unaffected by dust obscuration. These searches are almost certain to reveal several new Local Group members in coming years. Another complication in producing a complete census of the Local Group is the uncertainty involved with defi ...
... penetrate the haze of the Milky Way by detecting radiation that is unaffected by dust obscuration. These searches are almost certain to reveal several new Local Group members in coming years. Another complication in producing a complete census of the Local Group is the uncertainty involved with defi ...
A Zoo of Galaxies - Cambridge University Press
... In his 1927 defence of the classification scheme, Hubble claimed to have examined “upward of a thousand galaxies” in its construction. However for true physical understanding of a galaxy, more than just an image is required – we also need an estimate of its distance in order to reveal its size and ma ...
... In his 1927 defence of the classification scheme, Hubble claimed to have examined “upward of a thousand galaxies” in its construction. However for true physical understanding of a galaxy, more than just an image is required – we also need an estimate of its distance in order to reveal its size and ma ...
Exploring the Most Bizarre Ideas in Cosmology Astronomers
... somewhat broader view insofar as recent discoveries about other planets have uncovered many features and phenomena which may certainly be regarded as "weird" or anomalous in comparison with anything experienced on Earth. The present volume continues this approach. Strange observations are certainly ...
... somewhat broader view insofar as recent discoveries about other planets have uncovered many features and phenomena which may certainly be regarded as "weird" or anomalous in comparison with anything experienced on Earth. The present volume continues this approach. Strange observations are certainly ...
Teaching Tips Table of Contents - Hubble Deep Field
... The Mathematical World: C. Shapes By the end of 8th grade, students should know that ...
... The Mathematical World: C. Shapes By the end of 8th grade, students should know that ...
1 The Hubble Story (10:56)
... predicts that massive objects will deform the structure of space itself. When light passes one of these objects, such as a cluster of galaxies, its path is curved slightly. The effect is called gravitational lensing. Hubble’s sensitivity and high resolution allow it to observe numerous faint and dis ...
... predicts that massive objects will deform the structure of space itself. When light passes one of these objects, such as a cluster of galaxies, its path is curved slightly. The effect is called gravitational lensing. Hubble’s sensitivity and high resolution allow it to observe numerous faint and dis ...
Galaxies
... The radiation from these galaxies is called nonstellar radiation Many luminous galaxies are experiencing an outburst of star formation, probably due to interactions with a neighbor These galaxies are called starburst galaxies, and we will discuss them later The galaxies we will discuss now are those ...
... The radiation from these galaxies is called nonstellar radiation Many luminous galaxies are experiencing an outburst of star formation, probably due to interactions with a neighbor These galaxies are called starburst galaxies, and we will discuss them later The galaxies we will discuss now are those ...
from z=0 to z=1
... significantly higher SFR, higher attenuation, higher stellar mass, and higher correlation length than LBGs. 7. At intermediate redshifts of z~0.6, UV selected galaxies show moderate evolution in stellar mass in the sense that for a given luminosity, galaxies at z=0.6 have stellar mass ~2 times less ...
... significantly higher SFR, higher attenuation, higher stellar mass, and higher correlation length than LBGs. 7. At intermediate redshifts of z~0.6, UV selected galaxies show moderate evolution in stellar mass in the sense that for a given luminosity, galaxies at z=0.6 have stellar mass ~2 times less ...
– 1 – 1. Galaxy Observations 1.1.
... rate affecting the UV continuum, and the calibration for UV stellar photospheric features or UV ISM absorption to metallicity is not well understood at present (see Erb 2010 for details). So the best approach is to move into the near-IR, where the normal optical low redshift techniques and calibrati ...
... rate affecting the UV continuum, and the calibration for UV stellar photospheric features or UV ISM absorption to metallicity is not well understood at present (see Erb 2010 for details). So the best approach is to move into the near-IR, where the normal optical low redshift techniques and calibrati ...
arXiv:astro-ph/9701131v1 18 Jan 1997
... ejecting the majority, and driving a minority toward eventual accretion onto massive black holes. As the galaxy disperses, stellar remnants provide a mechanism for converting the halo dark matter into radiative energy. Posited weakly interacting massive particles are accreted by white dwarfs, where ...
... ejecting the majority, and driving a minority toward eventual accretion onto massive black holes. As the galaxy disperses, stellar remnants provide a mechanism for converting the halo dark matter into radiative energy. Posited weakly interacting massive particles are accreted by white dwarfs, where ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... to compare them with current astronomical knowledge. The Master Universe Size of the Master Universe The Urantia Book does not explicitly give a size for the master universe. It does imply that the master universe is finite and is expanding. "Even if the master universe eventually expands to infinit ...
... to compare them with current astronomical knowledge. The Master Universe Size of the Master Universe The Urantia Book does not explicitly give a size for the master universe. It does imply that the master universe is finite and is expanding. "Even if the master universe eventually expands to infinit ...
Measuring distances to the edge of the local group
... Scientific Justification Be sure to include overall significance to astronomy. For standard proposals limit text to one page with figures, captions and references on no more than two additional pages. We propose to measure the distance to the nearby dwarf irregular galaxies Sextans A, B, and NGC 310 ...
... Scientific Justification Be sure to include overall significance to astronomy. For standard proposals limit text to one page with figures, captions and references on no more than two additional pages. We propose to measure the distance to the nearby dwarf irregular galaxies Sextans A, B, and NGC 310 ...
An Expanded View of the Universe
... under extreme conditions, the amazingly rapid expansion (inflation) of the Universe after the Big Bang is not understood, dark matter seems to dominate the formation of the large scale structure but its nature remains unknown, and the recently discovered acceleration of the expansion of the Universe ...
... under extreme conditions, the amazingly rapid expansion (inflation) of the Universe after the Big Bang is not understood, dark matter seems to dominate the formation of the large scale structure but its nature remains unknown, and the recently discovered acceleration of the expansion of the Universe ...
Introduction
... responsible for removing the gas required to fuel star formation in these objects. A fraction of quenched late-type galaxies are, however, not gas deficient, and form a more heterogeneous class of objects with probably more complex evolutionary histories. In contrast to the case of star formation, t ...
... responsible for removing the gas required to fuel star formation in these objects. A fraction of quenched late-type galaxies are, however, not gas deficient, and form a more heterogeneous class of objects with probably more complex evolutionary histories. In contrast to the case of star formation, t ...
Building galaxies Hunt, Leslie Kipp
... that atomic gas mass fraction also varies along the Hubble sequence. On the other hand, the massto-light ratio measured in the B band remains relatively constant with morphology, even toward the very late spiral types (although see Burstein 1982). With data from Roberts & Haynes (1994), Figure 3 sho ...
... that atomic gas mass fraction also varies along the Hubble sequence. On the other hand, the massto-light ratio measured in the B band remains relatively constant with morphology, even toward the very late spiral types (although see Burstein 1982). With data from Roberts & Haynes (1994), Figure 3 sho ...
Super-solar Metal Abundances in Two Galaxies at ζ ∼ 3.57
... both in G0 and G1. From the rest-frame UV emission in the GRB location, we derive a relatively high, not corrected for dust extinction, star-formation rate SFR ≈ 6 M# yr−1 . These properties suggest a possible connection between some high-redshift GRB host galaxies and high-z massive sub-millimeter ...
... both in G0 and G1. From the rest-frame UV emission in the GRB location, we derive a relatively high, not corrected for dust extinction, star-formation rate SFR ≈ 6 M# yr−1 . These properties suggest a possible connection between some high-redshift GRB host galaxies and high-z massive sub-millimeter ...
PH607lec08
... the underlying luminosity distribution • Few E galaxies actually have flat luminosity profiles at small radii; instead, the profiles rise inward to the last measured point . • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to cou ...
... the underlying luminosity distribution • Few E galaxies actually have flat luminosity profiles at small radii; instead, the profiles rise inward to the last measured point . • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to cou ...
Observable universe
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.