Download or read book Recent Star Formation History of the Central Giant Elliptical Galaxy in the Cluster MACS J0329 7 0211 written by 李俊豪 and published by . This book was released on 2019 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Star Formation History of Elliptical Galaxies written by Louisa Anne Nolan and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Star Formation History of Elliptical Galaxies written by Louisa Anne Nolan and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Star Formation Histories of Nearby Elliptical Galaxies written by Justin H. Howell and published by . This book was released on 2004 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Recent Star Formation History of Galaxies in X ray Clusters written by Michael Lajos Balogh and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Recent Star Formation History of Galaxies in X ray Clusters written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Stellar Population Histories of Elliptical Galaxies written by Scott C. Trager and published by . This book was released on 1997 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Star Formation in Cluster Early type Galaxies written by Koshy George and published by . This book was released on 2013 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distances and Stellar Populations of Elliptical Galaxies written by Michael C. Liu and published by . This book was released on 2000 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnificent Constructions written by Kevin Christopher Cooke and published by . This book was released on 2019 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: "To understand how the present day universe came to be, we must understand how the massive structures in which we live formed and evolved over the preceding billions of years. Constraining how galaxies grow are the most massive galaxies, called brightest cluster galaxies (BCGs). These luminous and diffuse elliptical galaxies inhabit relaxed positions within their host cluster's gravitational potentials and provide a look at the high mass extreme of galaxy evolution. The relaxed structure, old stellar populations, and central location within the cluster indicate a high redshift formation scenario, however, star-forming BCGs have been observed at much more recent epochs. Addressing this evolutionary complexity, my dissertation consists of four studies to investigate the growth rates of BCGs over several epochs, and how they relate to the growth of the general galaxy population. In my first paper, I present a multiwavelength (far-ultraviolet to far-infrared) study of BCG star formation rates and stellar masses from 0.2 z 0.7 (Cooke et al. 2016), selected from the CLASH and SGAS surveys. I find that in-situ star formation in my sample is consistent with overall quiescence, and star-forming BCGs remain very rare. In my second paper (Cooke et al. 2018), my sample's redshift range is expanded to z ~ 1 with the addition of massive BCGs (M_Stellar 10^11 M_Solar) from galaxy clusters available in the COSMOS X-ray Group Catalog. I find that star formation is roughly constant in our sample of high mass BCGs from 0.3
Download or read book The Evolution of Galaxy Activity in Massive Clusters written by Emil S Noordeh and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature of galaxy evolution from the early Universe to the present day is intricately linked to large-scale environment: the environments of galaxies are expected to play a critical role in the development of their morphologies, star formation activity, and the activity of their central Super Massive Black Holes (SMBHs). Large scale environment can strongly and rapidly affect gas reservoirs which are a prerequisite for both star formation and SMBH activity. We would expect the effect of environment to be most pronounced in massive galaxy clusters, where both the density of the intracluster medium and number density of galaxies are the highest. This has indeed been established for star formation activity in the local and intermediate redshift universe, where dense, cluster environments are more likely to host elliptical, quiescent galaxies. However, the impact of the cluster environment on SMBH activity has been significantly less clear. At high redshift, the impact of clusters on galaxy activity is even less well understood. This is due to both a decline in the number of massive clusters at high redshift as well as increasing observational difficulty in reliably identifying and characterizing both the clusters themselves and their member galaxies. This dissertation tries to bring some clarity to these unknowns. First, we present an analysis of SMBH activity in a sample of massive clusters at intermediate redshift where we confirm a dependence of this activity on cluster mass. Second, we describe the spectroscopic characterization of one of the highest redshift galaxy clusters ever discovered, existing at a lookback time of more than 10 billion years. We model the stellar population of its member galaxies and trace their formation back to the cosmic dark ages, when the Universe was only 370 million years old. Finally, we do a deep dive into this cluster's galaxy population and find it to be remarkably similar to that of clusters in the local universe. We identify a tremendously enhanced quiescent fraction relative to the field and find evidence for accelerated size-evolution in these quiescent galaxies.
Download or read book The Second Stromlo Symposium written by Magda Arnaboldi and published by . This book was released on 1997 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Star Formation History of Early type Galaxies in the Fornax Cluster written by Harald Kuntschner and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Formation and Evolution of Star Clusters written by Kenneth Janes and published by . This book was released on 1991 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Evolution of Massive Galaxies written by Kristen Leah Shapiro and published by . This book was released on 2010 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxies, as the fundamental building blocks of the Universe, are the critical link between the overall evolution of the Universe and the assembly of small-scale structures, such as stars and planets, within it. Unfortunately, the formation and evolution of galaxies remains poorly understood, due to the incredible complexity of the physics that governs these processes. To study and constrain these processes, a particularly useful galaxy population are bulge-dominated galaxies such as elliptical and large spiral galaxies, which together are the most massive and most evolved components of the local Universe. In the present day, these galaxies are dominated by old stars; however, their histories likely include an epoch of powerful star formation and rapid growth of their supermassive black holes. Progress in understanding the evolution of massive galaxies can therefore proceed on two fronts -- 1) observations of their formation in situ in the early Universe, and 2) detailed studies of the fossil relics of this process in the local Universe -- with the ultimate goal being to link progenitors and descendants. A key epoch for such investigations is 10 billion years ago, the most active period in the Universe's history, at which time the vast majority of stellar material in galaxies was assembled. Recent comparisons of the observed properties of galaxy populations across cosmic time have shown that the dominant star-forming galaxy population at these early times were the probable ancestors of present-day massive (bulge-dominated spiral and elliptical) galaxies. The obvious direction for current and future research is therefore to probe the detailed evolution with time of the properties and sub-structures that define this local galaxy population. This goal has guided my dissertation research, as described in the following pages. Using photometric, spectroscopic, and integral-field observations at optical through mid-infrared wavelengths, I have studied both star-forming galaxies in the early Universe and their present-day descendants. Specifically, this thesis explores the dynamical, star-forming, and black hole properties of galaxies 10 billion years ago and shows that these young galaxies must be assembled via a rapid but steady influx of gas from the surrounding cosmic structure. The resulting large quantity of gas in these galaxies causes super-large star-forming gas clouds to form, and the dynamical interactions of these clouds control the evolution of the galaxies' supermassive black holes and internal sub-structures, producing the bulges and globular cluster populations observed in the present day. Studies of the resulting local massive galaxy population, also presented herein, confirm that such successive minor dynamical disturbances were important to the assembly of these bulge-dominated galaxies and their supermassive black holes. In the pages of this thesis, an exciting link is emerging in which many observed properties of local galaxies can be explained by the dramatic internal processes occurring in galaxies 10 billion years ago, during the era of the most rapid galaxy assembly.
Download or read book Characteristics of Young Massive Star Clusters in Nearby Galaxies written by Jenna Elizabeth Ryon and published by . This book was released on 2016 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Star formation commonly results in the production of star clusters. In recent years, observations with the Hubble Space Telescope have led to the discovery of young, massive star clusters in nearby galaxies, constituting a new class that may bridge the gap between open and globular clusters. In this thesis, I present observational studies focused on understanding the properties of young, massive cluster (YMC) populations across a range of galactic environments. Using multiwavelength HST data from the Snapshot Hubble U-band Cluster Survey, I select a high-confidence sample of YMCs in the spiral galaxy NGC 2997 and perform photometry. I characterize the physical properties of the YMC population, including determining the luminosity and mass functions, age distribution, and efficiency of cluster formation. This work helps to establish that in relatively quiescent spiral galaxies, YMCs tend to form with efficiencies of ~10%, and can survive for at least a few hundred Myr. I then present a study of star formation associated with giant gas filaments surrounding NGC 1275, the central galaxy in the Perseus galaxy cluster. I identify a population of YMCs embedded in "streaks" of stars using far-ultraviolet and optical data from HST. These objects may form when the galactic-scale gas filaments slow their expansion and become gravitationally unstable in the outer regions of the galaxy. This work shows that cluster formation can proceed relatively normally in unusual environments, and may form isolated clusters in the outskirts of galaxies. Finally, I focus on the structural properties of YMC populations in two studies. In the first, I measure the effective (half-light) radii, core radii, and light profiles of ~200 YMCs in seven adjacent HST fields on the spiral galaxy M83. In the second, I build upon the findings in the first using YMC samples from two spiral galaxies in the Legacy Extragalactic UV Survey, NGC 628 and NGC 1313. These studies imply that YMCs emerge from early evolution with similar radii, typically 2-3 pc, and are not strongly affected by their local environment.
Download or read book Probing the Star Formation History of Early type Galaxies in Clusters written by Alejandro Ivan Terlevich and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
