Teaching Tips Table of Contents - Hubble Deep Field
... AMAZING SPACE: HUBBLE DEEP FIELD ACADEMY ...
... AMAZING SPACE: HUBBLE DEEP FIELD ACADEMY ...
Methanol Masers in the NGC6334F Star Forming Region
... • The Southern star forming region NGC6334 is one of the most active OB star forming regions in the Galaxy. • It contains 6 different high-mass star forming sites detected at radio/infrared wavelengths, and different evolutionary phases. • The sources in the north-eastern part of the complex are the ...
... • The Southern star forming region NGC6334 is one of the most active OB star forming regions in the Galaxy. • It contains 6 different high-mass star forming sites detected at radio/infrared wavelengths, and different evolutionary phases. • The sources in the north-eastern part of the complex are the ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... at a distance of 840 kpc, is close enough for individual giant molecular clouds (GMCs) to be identified. The goal of this work is to study the properties of the GMCs in this subsolar metallicity galaxy. The CPROPS (Cloud PROPertieS) algorithm was used to identify 337 GMCs in M 33, the largest sample ...
... at a distance of 840 kpc, is close enough for individual giant molecular clouds (GMCs) to be identified. The goal of this work is to study the properties of the GMCs in this subsolar metallicity galaxy. The CPROPS (Cloud PROPertieS) algorithm was used to identify 337 GMCs in M 33, the largest sample ...
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 ...
azu_etd_13224_sip1_m
... I NTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... I NTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Galaxies in the Universe: An Introduction, Second Edition
... Boldface is used for vectors; italics indicate concepts from physics, or specialist terms from astronomy which the reader will see again in this text, or will meet in the astronomical literature. Because they deal with large distances and long timescales, astronomers use an odd mixture of units, dep ...
... Boldface is used for vectors; italics indicate concepts from physics, or specialist terms from astronomy which the reader will see again in this text, or will meet in the astronomical literature. Because they deal with large distances and long timescales, astronomers use an odd mixture of units, dep ...
- National Optical Astronomy Observatory
... Movement of the Iron ions is restricted to the magnetic field lines from within the umbra to the edge of the penumbra. This is supported by the data, which shows an initial outward flow of the ions and then a downward flow near penumbra. Because the nickel particles are not ionized, their velocities ...
... Movement of the Iron ions is restricted to the magnetic field lines from within the umbra to the edge of the penumbra. This is supported by the data, which shows an initial outward flow of the ions and then a downward flow near penumbra. Because the nickel particles are not ionized, their velocities ...
Annual Report 2012
... television on ALMA, with Leiden astronomers Ewine van Dishoeck and Tim van Kempen. Rumour has it that as a special tribute to Leiden it was broadcast on October 3. A fascinating project that combines outreach, techniques developed for astronomy and citizen science is ISPEX. ISPEX is a small device t ...
... television on ALMA, with Leiden astronomers Ewine van Dishoeck and Tim van Kempen. Rumour has it that as a special tribute to Leiden it was broadcast on October 3. A fascinating project that combines outreach, techniques developed for astronomy and citizen science is ISPEX. ISPEX is a small device t ...
Stars and Planets Credits and Acknowledgements
... galaxies students will move from the 1 to 10 billion scale model used with stars to one showing the size of the Milky Way in comparison to the spacing between galaxies in the Local Group. Images of our galactic neighbors are provided for the teacher to enrich the introduction to galaxies beyond our ...
... galaxies students will move from the 1 to 10 billion scale model used with stars to one showing the size of the Milky Way in comparison to the spacing between galaxies in the Local Group. Images of our galactic neighbors are provided for the teacher to enrich the introduction to galaxies beyond our ...
A spectroscopic investigation of the O
... which no evidence of binarity is found can never be definitely considered as single. Even if no RV shift is detected, the system could be seen under a particular orientation, have a very long period or perhaps a high eccentricity, thereby making the RV variations not significant over a long timescal ...
... which no evidence of binarity is found can never be definitely considered as single. Even if no RV shift is detected, the system could be seen under a particular orientation, have a very long period or perhaps a high eccentricity, thereby making the RV variations not significant over a long timescal ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. We compare cluster galaxy star 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 ...
... IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. We compare cluster galaxy star 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 ...
Constraints on the physical properties and chemical evolution of star
... The emission from interstellar gas heated by young stars in galaxies contains valuable clues about both the nature of these stars and the physical conditions in the interstellar medium. In particular, prominent emission lines produced by H ii regions, diffuse ionized gas and a potential active galac ...
... The emission from interstellar gas heated by young stars in galaxies contains valuable clues about both the nature of these stars and the physical conditions in the interstellar medium. In particular, prominent emission lines produced by H ii regions, diffuse ionized gas and a potential active galac ...
CPW
... of protons, not electrons, you can immediately eliminate C and D. • B is correct over A because like charges do in fact repel, not a^ract each other. If you did not know that like c ...
... of protons, not electrons, you can immediately eliminate C and D. • B is correct over A because like charges do in fact repel, not a^ract each other. If you did not know that like c ...
Strongly suggested reading: The stellar halo of the Galaxy
... In the early years, star counts were based on photographic images, and were usually restricted to just a few fields. This was also the basis for the pioneering Bahcall and Soneira (1980) model of the Galaxy. These authors took the approach that our Galaxy is “just” like any other galaxy, and so it s ...
... In the early years, star counts were based on photographic images, and were usually restricted to just a few fields. This was also the basis for the pioneering Bahcall and Soneira (1980) model of the Galaxy. These authors took the approach that our Galaxy is “just” like any other galaxy, and so it s ...
submillimeter observations of giant molecular clouds in the large
... The first spatially resolved complete sample of GMCs in a single galaxy has been obtained toward the whole LMC with the NANTEN 4 m telescope in 2.6 mm CO emission at 40 pc resolution (Fukui et al. 1999, 2001, 2007; Mizuno et al. 2001). These studies revealed the three types of GMCs in terms of star ...
... The first spatially resolved complete sample of GMCs in a single galaxy has been obtained toward the whole LMC with the NANTEN 4 m telescope in 2.6 mm CO emission at 40 pc resolution (Fukui et al. 1999, 2001, 2007; Mizuno et al. 2001). These studies revealed the three types of GMCs in terms of star ...
the PDF program book
... Welcome to Cool Stars 19 On behalf of the Cool Stars 19 LOC, the SOC, and Uppsala universitet, we welcome you to Uppsala, home to the oldest university in Scandinavia and the home of Carl Linnaeus, Anders Celsius and Anders Jonas Ångström. It is our goal to provide you with a relaxed and comfortabl ...
... Welcome to Cool Stars 19 On behalf of the Cool Stars 19 LOC, the SOC, and Uppsala universitet, we welcome you to Uppsala, home to the oldest university in Scandinavia and the home of Carl Linnaeus, Anders Celsius and Anders Jonas Ångström. It is our goal to provide you with a relaxed and comfortabl ...
Statistical properties of a sample of periodically variable B-type supergiants ⋆
... since they are (by definition) free from saturation effects and least affected by collisional broadening. We have the following lines at our disposal: either Si II 4128-4130 or Si III 45524567-4574 (depending on spectral type), Mg II 4481 (in the same spectral order as He I 4471) and, for slow rotat ...
... since they are (by definition) free from saturation effects and least affected by collisional broadening. We have the following lines at our disposal: either Si II 4128-4130 or Si III 45524567-4574 (depending on spectral type), Mg II 4481 (in the same spectral order as He I 4471) and, for slow rotat ...
The visibility of Lyman Alpha Emitters: constraining reionization
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
story of telescope
... Historical changes are slow and occur over a period of time, and the history of ideas in human thought is no exception. But one particular event stands out above all in the history of science. In July 1609, Galileo Galilei used an instrument to look at stars, and the discoveries he reported changed ...
... Historical changes are slow and occur over a period of time, and the history of ideas in human thought is no exception. But one particular event stands out above all in the history of science. In July 1609, Galileo Galilei used an instrument to look at stars, and the discoveries he reported changed ...
Chapter J2
... Passage 1 Quasars are some of the most puzzling objects in the sky. If viewed through an optical telescope, a quasar appears as a small, dim star. Quasars are the most distant objects that have been observed from Earth. But many quasars are hundreds of times brighter than the brightest galaxy. Becau ...
... Passage 1 Quasars are some of the most puzzling objects in the sky. If viewed through an optical telescope, a quasar appears as a small, dim star. Quasars are the most distant objects that have been observed from Earth. But many quasars are hundreds of times brighter than the brightest galaxy. Becau ...
ancient cultures 114 - Stellenbosch University
... mundane and inappropriate as domestic lighting when viewed from a distance). In true astronomical terms, however, a star is a giant ball of gas, constantly undergoing nuclear processes, and as such constantly emitting electromagnetic waves. The light waves produced from these reactions are particula ...
... mundane and inappropriate as domestic lighting when viewed from a distance). In true astronomical terms, however, a star is a giant ball of gas, constantly undergoing nuclear processes, and as such constantly emitting electromagnetic waves. The light waves produced from these reactions are particula ...
Was a cloud-cloud collision the trigger of the recent star formation in
... in the field, but they appear more dispersed, without an obvious connection to the current protostars, and are no longer embedded or surrounded by any cold dust seen at submillimetre wavelengths. Presumably they belong to a different burst of starformation, which occurred 2 Myr before the current one ...
... in the field, but they appear more dispersed, without an obvious connection to the current protostars, and are no longer embedded or surrounded by any cold dust seen at submillimetre wavelengths. Presumably they belong to a different burst of starformation, which occurred 2 Myr before the current one ...
The Nature of the Stars
... across the plane of the sky—is called the star’s tangential velocity (vt). To determine it, astronomers must know the distance to a star (d) and its proper motion (, the Greek letter mu), which is the number of arcseconds that the star appears to move per year on the celestial sphere. Proper motion ...
... across the plane of the sky—is called the star’s tangential velocity (vt). To determine it, astronomers must know the distance to a star (d) and its proper motion (, the Greek letter mu), which is the number of arcseconds that the star appears to move per year on the celestial sphere. Proper motion ...
this article
... formation rates. While the majority of Sa–Sab galaxies in our sample are forming stars at a modest rate, a significant fraction (29%) exhibit star formation rates greater than 1 M yr1, rivaling the most prolifically star-forming latetype spirals. A similar diversity is apparent in the star format ...
... formation rates. While the majority of Sa–Sab galaxies in our sample are forming stars at a modest rate, a significant fraction (29%) exhibit star formation rates greater than 1 M yr1, rivaling the most prolifically star-forming latetype spirals. A similar diversity is apparent in the star format ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.