Star Formation in Galaxies Along the Hubble Sequence
... Hubble sequence as a monotonic sequence in present-day SFRs and past star formation histories. Quantifying this picture required the development of more precise diagnostics of global SFRs in galaxies. The first quantitative SFRs were derived from evolutionary synthesis models of galaxy colors (Tinsl ...
... Hubble sequence as a monotonic sequence in present-day SFRs and past star formation histories. Quantifying this picture required the development of more precise diagnostics of global SFRs in galaxies. The first quantitative SFRs were derived from evolutionary synthesis models of galaxy colors (Tinsl ...
Morphological evolution of galaxies over the last 8 billion years
... I have used large deep surveys to study the mass assembly history of galaxies, the evolution of their structural properties, and the history of star formation in the Universe. In recent work, my collaborators and I have shown that about half of the present day stars were already in place at z ≈ 1, i ...
... I have used large deep surveys to study the mass assembly history of galaxies, the evolution of their structural properties, and the history of star formation in the Universe. In recent work, my collaborators and I have shown that about half of the present day stars were already in place at z ≈ 1, i ...
Observational Studies of Interacting Galaxies and the Development
... understanding of galaxy merger evolution through both observational studies and instrument developments. Observationally, I approach the goal photometrically and spectroscopically. The photometric studies better constrain the number density evolution of wet and dry mergers through five CFHTLS broad ...
... understanding of galaxy merger evolution through both observational studies and instrument developments. Observationally, I approach the goal photometrically and spectroscopically. The photometric studies better constrain the number density evolution of wet and dry mergers through five CFHTLS broad ...
Spectro-Morphology of Galaxies.
... The morphology of galaxies is the result of physical processes that acted on these systems since their formation. In an attempt to organize galaxies and to understand their evolution, the Hubble-Sandage classification, based on the bulge-to-disk ratio, was built from the study of a sample of nearby ...
... The morphology of galaxies is the result of physical processes that acted on these systems since their formation. In an attempt to organize galaxies and to understand their evolution, the Hubble-Sandage classification, based on the bulge-to-disk ratio, was built from the study of a sample of nearby ...
T3-Cosmic Star Formation History
... events that led from the formation of the first stars after the end of the cosmic dark ages to the present-day diversity of forms, sizes, masses, colors, luminosities, metallicities, and clustering properties of galaxies. This is a daunting task, and it is perhaps not surprising that an alternative w ...
... events that led from the formation of the first stars after the end of the cosmic dark ages to the present-day diversity of forms, sizes, masses, colors, luminosities, metallicities, and clustering properties of galaxies. This is a daunting task, and it is perhaps not surprising that an alternative w ...
Chapter 5 The Evolutionary Paths Of Nearby Galaxies
... of a small random sample of the massive late-types residing across the blue cloud and transition region, demonstrating the visible reddening at optical wavelengths. Therefore, in the rest of this section I focus on the properties of late-type galaxies to try to understand the mechanisms behind the q ...
... of a small random sample of the massive late-types residing across the blue cloud and transition region, demonstrating the visible reddening at optical wavelengths. Therefore, in the rest of this section I focus on the properties of late-type galaxies to try to understand the mechanisms behind the q ...
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 ...
Early star formation and the evolution of the stellar initial mass
... only a slow increase with time over most of Galactic history. These observations suggest that the rate of production of heavy elements was higher at early times than at more recent times. (3) The large total mass of heavy elements observed in the hot gas in large clusters of galaxies suggests that t ...
... only a slow increase with time over most of Galactic history. These observations suggest that the rate of production of heavy elements was higher at early times than at more recent times. (3) The large total mass of heavy elements observed in the hot gas in large clusters of galaxies suggests that t ...
Where stars form: inside-out growth and coherent star formation from
... JF125W /HF140W /HF160W selected photometric catalogs (see Skelton et al. 2014). These photometric catalogs form the scaffolding of this project upon which all the remaining data products rest. For this study, we rely on the rest-frame colors, stellar masses, and star formation rates. All of these qu ...
... JF125W /HF140W /HF160W selected photometric catalogs (see Skelton et al. 2014). These photometric catalogs form the scaffolding of this project upon which all the remaining data products rest. For this study, we rely on the rest-frame colors, stellar masses, and star formation rates. All of these qu ...
Science Case for the Chinese Participation of TMT
... reveal that the Universe is dominated by dark matter and dark energy. The nature of these two dark components is the most fundamental question in (astro-)physics today. The discovery of more than 400 extrasolar planet systems indicates that our solar system may be the exception rather than the norm; ...
... reveal that the Universe is dominated by dark matter and dark energy. The nature of these two dark components is the most fundamental question in (astro-)physics today. The discovery of more than 400 extrasolar planet systems indicates that our solar system may be the exception rather than the norm; ...
Galaxy And Mass Assembly (GAMA): Gas Fueling of Spiral Galaxies
... clouds. Thus, the prevalence of red, low specific SFR (sSFR) galaxies may actually be more indicative of transformative processes affecting the morphology of satellite galaxies than of effects linked to the supply of gas, making control of the galaxy morphology paramount to any empirically driven inv ...
... clouds. Thus, the prevalence of red, low specific SFR (sSFR) galaxies may actually be more indicative of transformative processes affecting the morphology of satellite galaxies than of effects linked to the supply of gas, making control of the galaxy morphology paramount to any empirically driven inv ...
Models of galaxy collisions in Stephan`s Quintet and other
... model disks (see Figure 1.1). They also reproduced the basic stellar morphologies of several specific binary systems which posses very extended peculiar features, showing that tidal forces alone in close encounters could deform the appearances of the systems as observed. Their model results and disc ...
... model disks (see Figure 1.1). They also reproduced the basic stellar morphologies of several specific binary systems which posses very extended peculiar features, showing that tidal forces alone in close encounters could deform the appearances of the systems as observed. Their model results and disc ...
Messier 87
Messier 87 (also known as Virgo A or NGC 4486, and generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo. One of the most massive galaxies in the local universe, it is notable for its large population of globular clusters—M87 contains about 12,000 compared to the 150-200 orbiting the Milky Way—and its jet of energetic plasma that originates at the core and extends outward at least 1,500 parsecs (4,900 light-years), travelling at relativistic speed. It is one of the brightest radio sources in the sky, and is a popular target for both amateur astronomy observations and professional astronomy study.French astronomer Charles Messier discovered M87 in 1781, cataloguing it as a nebulous feature while searching for objects that would confuse comet hunters. The second brightest galaxy within the northern Virgo Cluster, M87 is located about 16.4 million parsecs (53.5 million light-years) from Earth. Unlike a disk-shaped spiral galaxy, M87 has no distinctive dust lanes. Instead, it has an almost featureless, ellipsoidal shape typical of most giant elliptical galaxies, diminishing in luminosity with distance from the centre. Forming around one sixth of M87's mass, the stars in this galaxy have a nearly spherically symmetric distribution, their density decreasing with increasing distance from the core. At the core is a supermassive black hole, which forms the primary component of an active galactic nucleus. This object is a strong source of multiwavelength radiation, particularly radio waves. M87's galactic envelope extends out to a radius of about 150 kiloparsecs (490,000 light-years), where it has been truncated—possibly by an encounter with another galaxy. Between the stars is a diffuse interstellar medium of gas that has been chemically enriched by elements emitted from evolved stars.