in search of antimatter in the universe
... Spiral galaxies do not often feature AGN, and so instead, we consider elliptical galaxies, which have stars evenly distributed throughout the volume of an ellipse. One such galaxy is Centaurus A, which is the closest galaxy to us with an AGN jet, at 3.7 Mega parsecs (1 parsec is 3.1x1016 m). This me ...
... Spiral galaxies do not often feature AGN, and so instead, we consider elliptical galaxies, which have stars evenly distributed throughout the volume of an ellipse. One such galaxy is Centaurus A, which is the closest galaxy to us with an AGN jet, at 3.7 Mega parsecs (1 parsec is 3.1x1016 m). This me ...
Comprehensive Census and Complete Characterization of Nearby
... photosphere. The summary of these criteria are included in Table 1 and more thorough description can be found in Cotten & Song (2015, in prep). Ruling out any duplicates found between the literature search and this new Tycho2/AllWISE search, assembled 963 unique infrared excess stars. Assessment of ...
... photosphere. The summary of these criteria are included in Table 1 and more thorough description can be found in Cotten & Song (2015, in prep). Ruling out any duplicates found between the literature search and this new Tycho2/AllWISE search, assembled 963 unique infrared excess stars. Assessment of ...
environmental effects on galaxy evolution in nearby clusters
... This work represents the end point of my student career. After approximately twenty one years from my first entrance in a class room (it was September 1984 in Phoenix, AZ), I’m finally going to attend my last ”school” examination. Therefore I want to seize this opportunity in order to briefly rememb ...
... This work represents the end point of my student career. After approximately twenty one years from my first entrance in a class room (it was September 1984 in Phoenix, AZ), I’m finally going to attend my last ”school” examination. Therefore I want to seize this opportunity in order to briefly rememb ...
Collisions and Encounters of Stellar Systems
... post-collision remnant might lose much of its orbital angular momentum, and then fall towards the bottom of the potential well of the whole system, thereby enhancing the cloud-collision and star-formation rates still further. We do not yet have a good understanding of this complex chain of events, b ...
... post-collision remnant might lose much of its orbital angular momentum, and then fall towards the bottom of the potential well of the whole system, thereby enhancing the cloud-collision and star-formation rates still further. We do not yet have a good understanding of this complex chain of events, b ...
ppt - NRAO
... comprehension of the birth and pre-main sequence evolution of stars is significantly poorer. o Accurate observational data are needed to constrain the models. o Distance errors dominate the error budget ...
... comprehension of the birth and pre-main sequence evolution of stars is significantly poorer. o Accurate observational data are needed to constrain the models. o Distance errors dominate the error budget ...
XXII. Low-efficiency star formation in early-type galaxies
... H I in 40 per cent of the galaxies that are not in the Virgo cluster, with H I masses from 107 to a few 109 M . More relevant for star formation, molecular gas is detected in 22 per cent of ETGs, with an average molecular gas-to-star mass fraction of a few per cent (1– 5 per cent, Young et al. 2011 ...
... H I in 40 per cent of the galaxies that are not in the Virgo cluster, with H I masses from 107 to a few 109 M . More relevant for star formation, molecular gas is detected in 22 per cent of ETGs, with an average molecular gas-to-star mass fraction of a few per cent (1– 5 per cent, Young et al. 2011 ...
The visibility of Lyman Alpha Emitters: constraining reionization
... that would be observationally classified as LAEs. Using this model, the authors showed that the effects of dust and IGM are degenerate in affecting the visibility of LAEs such that a large fα can be compensated by a small Tα and vice versa to yield a given value of the observed Lyα luminosity. Howev ...
... that would be observationally classified as LAEs. Using this model, the authors showed that the effects of dust and IGM are degenerate in affecting the visibility of LAEs such that a large fα can be compensated by a small Tα and vice versa to yield a given value of the observed Lyα luminosity. Howev ...
Star Formation in the Milky Way and Nearby Galaxies Further
... star formation on all scales, thanks in no small part to new facilities such as the Galaxy Evolution Explorer (GALEX), the Spitzer Space Telescope, and the Herschel Space Observatory; the introduction of powerful new instruments on the Hubble Space Telescope (HST); and a host of ground-based optical ...
... star formation on all scales, thanks in no small part to new facilities such as the Galaxy Evolution Explorer (GALEX), the Spitzer Space Telescope, and the Herschel Space Observatory; the introduction of powerful new instruments on the Hubble Space Telescope (HST); and a host of ground-based optical ...
Astronomy 140 Lecture Notes, Spring 2008 c
... 0th magnitude flux F◦ is quite difficult, since it requires the comparison of a star with a laboratory standard light source. Stars are much fainter and hotter than lab standards, and are also much further away and observed through the atmosphere. Correcting for all these problems still leaves an un ...
... 0th magnitude flux F◦ is quite difficult, since it requires the comparison of a star with a laboratory standard light source. Stars are much fainter and hotter than lab standards, and are also much further away and observed through the atmosphere. Correcting for all these problems still leaves an un ...
Edgar Allan Poe: the first man to conceive a Newtonian evolving
... Dimensions, Space and Voids Poe takes the size the Universe of about 3 million light years, as estimated by William Herschel from the limiting magnitude of the objects he was able to see with his telescope: yet so far removed from us are some of the "nebulae" that even light, speeding with this velo ...
... Dimensions, Space and Voids Poe takes the size the Universe of about 3 million light years, as estimated by William Herschel from the limiting magnitude of the objects he was able to see with his telescope: yet so far removed from us are some of the "nebulae" that even light, speeding with this velo ...
lecture outlines
... Hypothesis, Kapteyn, Kapteyn Universe, selected areas FURTHER STUDIES: 7. The Kapteyn universe: selected areas and photography ...
... Hypothesis, Kapteyn, Kapteyn Universe, selected areas FURTHER STUDIES: 7. The Kapteyn universe: selected areas and photography ...
Astrometry of Asteroids
... ascension. A star with a right ascension of 5 hours would be 50 hours, or 75 degrees, east of the line of right ascension (0H) that runs through the vernal equinox. There are many catalogs of objects in the heavens which list their right ascensions and declinations. It’s impossible to list all the s ...
... ascension. A star with a right ascension of 5 hours would be 50 hours, or 75 degrees, east of the line of right ascension (0H) that runs through the vernal equinox. There are many catalogs of objects in the heavens which list their right ascensions and declinations. It’s impossible to list all the s ...
The Search for Directed Intelligence
... effects which would otherwise be overwhelming for a broadband photometric band survey. Heterodyning is also possible could be used in the future but is not assumed as we do not posses large focal plane arrays of such detectors. 5.2 Cosmic IR Background - CIB The CIB was first detected by the Diffuse ...
... effects which would otherwise be overwhelming for a broadband photometric band survey. Heterodyning is also possible could be used in the future but is not assumed as we do not posses large focal plane arrays of such detectors. 5.2 Cosmic IR Background - CIB The CIB was first detected by the Diffuse ...
White dwarfs from GAIA: The 7th dimension
... • The white dwarf luminosity function of Gaia is a sensitive probe of the averaged star formation rate • Due to their very short main-sequence lifetimes the shape of the SFR can be reconstructed from the luminosity function of massive white dwarfs • To achieve these goals, we need R~5000 spectroscop ...
... • The white dwarf luminosity function of Gaia is a sensitive probe of the averaged star formation rate • Due to their very short main-sequence lifetimes the shape of the SFR can be reconstructed from the luminosity function of massive white dwarfs • To achieve these goals, we need R~5000 spectroscop ...
Penn State Astronomy 11 Laboratory
... Most of the observations you will make this semester will be similar to those that have been made by countless numbers of astronomers throughout history. However, they will be unique to you, and give you the opportunity to discover the nature of the universe for yourself. Students often ask, “What i ...
... Most of the observations you will make this semester will be similar to those that have been made by countless numbers of astronomers throughout history. However, they will be unique to you, and give you the opportunity to discover the nature of the universe for yourself. Students often ask, “What i ...
Astronomy Laboratory Manual
... Fremont Peak Observatory is located in the beautiful Fremont Peak State Park in San Juan Bautista. It is about a 1 hour drive from Salinas. The road up the mountain is very windy and at times steep. Be very careful when driving at night. The date of the field trip will be announced several weeks ahe ...
... Fremont Peak Observatory is located in the beautiful Fremont Peak State Park in San Juan Bautista. It is about a 1 hour drive from Salinas. The road up the mountain is very windy and at times steep. Be very careful when driving at night. The date of the field trip will be announced several weeks ahe ...
RXTE PCA Contributions to Monitoring Fast Transients
... 62 sources are in the current fit list, including: 18 XTE 6 SAX 4 GRS 3 SLX 3 EXO 6 RXS + 4U, 2S, GS, 1E, NGC, SGR2. (Many were seen by more than 1 mission and which name we use may be “accidental”.) ~ 31 of these are transient (not there at the 3 sigma level at some time). ~ 31 have been on always ...
... 62 sources are in the current fit list, including: 18 XTE 6 SAX 4 GRS 3 SLX 3 EXO 6 RXS + 4U, 2S, GS, 1E, NGC, SGR2. (Many were seen by more than 1 mission and which name we use may be “accidental”.) ~ 31 of these are transient (not there at the 3 sigma level at some time). ~ 31 have been on always ...
Using time to measure distance - AS-A2
... sky. They were both in the south at midnight, which means that the Earth was directly between them and the Sun. This is called an ‘opposition’. It also means that the two planets were both at the same time at their closest to the Earth. At this time Jupiter was the brightest object in the night sky ...
... sky. They were both in the south at midnight, which means that the Earth was directly between them and the Sun. This is called an ‘opposition’. It also means that the two planets were both at the same time at their closest to the Earth. At this time Jupiter was the brightest object in the night sky ...
June, 2001 AAS poster - David P. Bennett
... These figures show light curves of massive planet events from our VISTA simulations. As the lens mass increases, the probability that the event will pass our time sampling criteria decreases quite sharply as indicated in our “# of detected planets” plot (on page 7). For planets in the 10-100 M⊕ rang ...
... These figures show light curves of massive planet events from our VISTA simulations. As the lens mass increases, the probability that the event will pass our time sampling criteria decreases quite sharply as indicated in our “# of detected planets” plot (on page 7). For planets in the 10-100 M⊕ rang ...
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.