Is there a Supermassive Black Hole at the Center of the Milky Way?
... density is 4 × 109 M⊙ pc−3 . Were one to place 4 × 107 stars inside a radius of 0.13 parsecs, the system would be dynamically unstable with less massive stars being expelled (“evaporated”) and more massive stars sinking to the center, colliding and possibly forming a black hole. The timescale for th ...
... density is 4 × 109 M⊙ pc−3 . Were one to place 4 × 107 stars inside a radius of 0.13 parsecs, the system would be dynamically unstable with less massive stars being expelled (“evaporated”) and more massive stars sinking to the center, colliding and possibly forming a black hole. The timescale for th ...
Project Description - SDSS-III
... expansion of the Universe. Large-scale imaging and spectroscopic surveys have revealed rich, complex structure in the outer Milky Way, residual traces of the Galaxy’s hierarchical formation history. These surveys have discovered more than a dozen new members of the Local Group of galaxies and identi ...
... expansion of the Universe. Large-scale imaging and spectroscopic surveys have revealed rich, complex structure in the outer Milky Way, residual traces of the Galaxy’s hierarchical formation history. These surveys have discovered more than a dozen new members of the Local Group of galaxies and identi ...
Galaxy Disks Further
... point is that these two systems differ significantly only in morphological classification and nothing else. The detailed structure of a galaxy, its morphology, and spiral structure may be determined by external properties such as environment or may even be transient, so that during the lifetime of t ...
... point is that these two systems differ significantly only in morphological classification and nothing else. The detailed structure of a galaxy, its morphology, and spiral structure may be determined by external properties such as environment or may even be transient, so that during the lifetime of t ...
PDF only - at www.arxiv.org.
... vertical H2O2 profiles and in a unique way constrain photochemical models. Other important species are HO2 and OH not observed by HIFI, since Mars’ apparent diameter was too small during the Herschel observation windows so that the planet was not resolved. With larger collection area and higher s ...
... vertical H2O2 profiles and in a unique way constrain photochemical models. Other important species are HO2 and OH not observed by HIFI, since Mars’ apparent diameter was too small during the Herschel observation windows so that the planet was not resolved. With larger collection area and higher s ...
Spring 2015 Mercury - Astronomical Society of the Pacific
... A quarter-century and five servicing missions later, Hubble is performing better than ever. But perhaps the most fascinating aspect of Hubble’s history is that it’s making observations that were never envisioned when it was being designed and built. Here’s one example. In the July 1982 Scientific Am ...
... A quarter-century and five servicing missions later, Hubble is performing better than ever. But perhaps the most fascinating aspect of Hubble’s history is that it’s making observations that were never envisioned when it was being designed and built. Here’s one example. In the July 1982 Scientific Am ...
- Isaac Newton Group of Telescopes
... blue magnitude limit of B=27.5 magnitudes. These data are deeper than any previously published B-band count. In recent years sensitive optical surveys have revealed a large population of faint blue galaxies, which are believed to be young galaxies observed close to their time of formation. But the ...
... blue magnitude limit of B=27.5 magnitudes. These data are deeper than any previously published B-band count. In recent years sensitive optical surveys have revealed a large population of faint blue galaxies, which are believed to be young galaxies observed close to their time of formation. But the ...
Annual Report 2006/2007
... The NOVA research program concentrates on the following three interconnected areas: • Network 1: Formation and evolution of galaxies: from high redshift to the present Galaxies contain billions of stars, as well as interstellar gas and dust, and are embedded in dark halos of unknown constitution. A ...
... The NOVA research program concentrates on the following three interconnected areas: • Network 1: Formation and evolution of galaxies: from high redshift to the present Galaxies contain billions of stars, as well as interstellar gas and dust, and are embedded in dark halos of unknown constitution. A ...
The science case for - Astrophysics
... Were stars the first objects to form? Were the first stars the source of the ultraviolet photons which re-ionised the Universe some 200million years after the Big Bang, and made it transparent? These objects may be visible through their supernovae, or their ionisation zones. How many types of matter ...
... Were stars the first objects to form? Were the first stars the source of the ultraviolet photons which re-ionised the Universe some 200million years after the Big Bang, and made it transparent? These objects may be visible through their supernovae, or their ionisation zones. How many types of matter ...
THE PRIMORDIAL HELIUM ABUNDANCE Manuel Peimbert
... representative of the whole star, and consequently that they had cosmological implications, and concluded that this was not the case. Searle & Sargent (17) obtained for Y values of 0.29 ± 0.05 and 0.25 ± 0.05 respectively, for I Zwicky 18 and II Zwicky 40 two irregular galaxies with: a low content o ...
... representative of the whole star, and consequently that they had cosmological implications, and concluded that this was not the case. Searle & Sargent (17) obtained for Y values of 0.29 ± 0.05 and 0.25 ± 0.05 respectively, for I Zwicky 18 and II Zwicky 40 two irregular galaxies with: a low content o ...
Teil 2
... suggests that the flip-flop phenomenon is caused by changing the relative strengths of the spot groups at the two active longitudes without actual spot movement on the stellar surface. Inversions of light-curves result in maps of spot filling factor. The second figure shows the phases of the maximum ...
... suggests that the flip-flop phenomenon is caused by changing the relative strengths of the spot groups at the two active longitudes without actual spot movement on the stellar surface. Inversions of light-curves result in maps of spot filling factor. The second figure shows the phases of the maximum ...
An Expanded View of the Universe
... 1755 by Immanuel Kant, and used at the be ginning of the 20th century to define spiral nebulae as independent galaxies outside the Milky Way. Trying to understand galaxy formation and evolution has become one of the most active fields of astronomical research over the last few decades, as large tel ...
... 1755 by Immanuel Kant, and used at the be ginning of the 20th century to define spiral nebulae as independent galaxies outside the Milky Way. Trying to understand galaxy formation and evolution has become one of the most active fields of astronomical research over the last few decades, as large tel ...
Ch 33) Astrophysics and Cosmology
... fairly regular elliptical shapes. Immanuel Kant (about 1755) guessed they are faint because they are a great distance beyond our Galaxy. At first it was not universally accepted that these objects were extragalactic—that is, outside our Galaxy. But the very large telescopes constructed in the twenti ...
... fairly regular elliptical shapes. Immanuel Kant (about 1755) guessed they are faint because they are a great distance beyond our Galaxy. At first it was not universally accepted that these objects were extragalactic—that is, outside our Galaxy. But the very large telescopes constructed in the twenti ...
ESA BR-170 - ESA Science
... 1650 Bishop Ussher had famously calculated the date of creation as 4004 BC. The first to recognise the true age of the Earth was a Scottish physician called James Hutton, an amateur geologist, who, in 1790, realised from his study of rock formations that the Earth had to be much older. It was so man ...
... 1650 Bishop Ussher had famously calculated the date of creation as 4004 BC. The first to recognise the true age of the Earth was a Scottish physician called James Hutton, an amateur geologist, who, in 1790, realised from his study of rock formations that the Earth had to be much older. It was so man ...
Missions
... The first infrared survey of the sky, performed by Gerry Neugebauer and Robert Leighton – who built their own telescope for the purpose – changed this view completely. The results were published in 1965 and Harwit describes them as “electrifying”: they revealed ten objects that were completely invis ...
... The first infrared survey of the sky, performed by Gerry Neugebauer and Robert Leighton – who built their own telescope for the purpose – changed this view completely. The results were published in 1965 and Harwit describes them as “electrifying”: they revealed ten objects that were completely invis ...
The Swift satellite lives up to its name, revealing cosmic
... stringent limits, and together with the elliptical host galaxy this provided evidence in support of an origin for short bursts which is completely different from the massive star origins of their long-duration cousins: the compact binary merger scenario. This scenario was proposed for the origin of ...
... stringent limits, and together with the elliptical host galaxy this provided evidence in support of an origin for short bursts which is completely different from the massive star origins of their long-duration cousins: the compact binary merger scenario. This scenario was proposed for the origin of ...
GRB prompt emission
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
GRB prompt emission
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater⋆†
... No globular cluster has ever accomplished the feat of prolonging its star formation by several Gyr. Therefore, if our hypothesis that the blue bright stars in Crater are blue loop giants is correct, the new satellite should be classified as a dwarf galaxy with unusual properties. Note that only 10◦ ...
... No globular cluster has ever accomplished the feat of prolonging its star formation by several Gyr. Therefore, if our hypothesis that the blue bright stars in Crater are blue loop giants is correct, the new satellite should be classified as a dwarf galaxy with unusual properties. Note that only 10◦ ...
ISA_lecture01 - School of Physics
... vastly, hugely, mind-bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist, but that’s just peanuts to space.” Douglas Adams, The Hitchhiker’s Guide to the Galaxy ...
... vastly, hugely, mind-bogglingly big it is. I mean, you may think it’s a long way down the road to the chemist, but that’s just peanuts to space.” Douglas Adams, The Hitchhiker’s Guide to the Galaxy ...
AR2012 - Vatican Observatory
... Venus transits are remarkably rare events; they occur in pairs, eight years apart, followed by more than a century before the next pair occur. This year’s transit was ...
... Venus transits are remarkably rare events; they occur in pairs, eight years apart, followed by more than a century before the next pair occur. This year’s transit was ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... formation to that of the field over 0.15 < z < 1.5 using ∼8000 galaxies from the UltraVISTA survey. Mid-infrared star formation rates are measured using Spitzer 24 µm data for isolated high-redshift galaxies. We calculate rest-frame ultraviolet star formation rates for low-redshift cluster members u ...
... formation to that of the field over 0.15 < z < 1.5 using ∼8000 galaxies from the UltraVISTA survey. Mid-infrared star formation rates are measured using Spitzer 24 µm data for isolated high-redshift galaxies. We calculate rest-frame ultraviolet star formation rates for low-redshift cluster members u ...
course objectives - Metropolitan Community College
... COURSE DESCRIPTION: This course is an introductory course in astronomy that covers the tools of astronomy, the night sky, the solar system, stars and star systems, galaxies, and cosmology. This is a lecture-only course. The lab course that complements this course is SCIE 1310. ...
... COURSE DESCRIPTION: This course is an introductory course in astronomy that covers the tools of astronomy, the night sky, the solar system, stars and star systems, galaxies, and cosmology. This is a lecture-only course. The lab course that complements this course is SCIE 1310. ...
Hubble Deep Field Academy -- Overview
... The purpose of this lesson is to allow students to experience the processes actual scientists go through to organize and synthesize new information. They will have the opportunity to ask and answer questions of their own about a previously unknown region of space and then to compare their analysis t ...
... The purpose of this lesson is to allow students to experience the processes actual scientists go through to organize and synthesize new information. They will have the opportunity to ask and answer questions of their own about a previously unknown region of space and then to compare their analysis t ...
EROs and submm galaxies: Expectations for FMOS in the
... EROs: photometric classification Mannucci et al. (2002) find approximately equal numbers of Es and SBs. The distribution of galaxies is not bimodal, and photometric uncertainties are large. ...
... EROs: photometric classification Mannucci et al. (2002) find approximately equal numbers of Es and SBs. The distribution of galaxies is not bimodal, and photometric uncertainties are large. ...
Cold galaxies at low and high z
... the distances between galaxies will increase at an ever-accelerating rate, but the horizon will remain fixed at more or less its current size, 13 billion light yrs eventually, after 100 billion years, our Galaxy will have merged with Andromeda and our other neighbours in the Local Group into a singl ...
... the distances between galaxies will increase at an ever-accelerating rate, but the horizon will remain fixed at more or less its current size, 13 billion light yrs eventually, after 100 billion years, our Galaxy will have merged with Andromeda and our other neighbours in the Local Group into a singl ...
Galaxy Zoo
Galaxy Zoo is a crowdsourced astronomy project which invites people to assist in the morphological classification of large numbers of galaxies. (e.g.) It is an example of citizen science as it enlists the help of members of the public to help in scientific research. There have been seven versions up to July 2014, which are outlined in this article. Galaxy Zoo is part of the Zooniverse, a group of citizen science projects.