Starformation In A Pair Of Interacting Galaxies

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Starformation In A Pair Of Interacting Galaxies

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Author : Mehdi Jahanmiri
language : en
Publisher:
Release Date : 1990

Starformation In A Pair Of Interacting Galaxies written by Mehdi Jahanmiri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Galaxies categories.

Models Of Star Formation In Interacting And Merging Disk Galaxies

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Author : James Christopher Mihos
language : en
Publisher:
Release Date : 1992

Models Of Star Formation In Interacting And Merging Disk Galaxies written by James Christopher Mihos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Active galaxies categories.

Exploring The Limits Of Star Formation From The Extreme Environment Of Galaxy Interactions To The Milky Way

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Author : Amanda Lea Heiderman
language : en
Publisher:
Release Date : 2012

Exploring The Limits Of Star Formation From The Extreme Environment Of Galaxy Interactions To The Milky Way written by Amanda Lea Heiderman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

In this thesis, I explore the rate at which molecular gas is converted to stars through detailed studies of a sample of molecular clouds in the Milky Way, IFU spatially resolved observations of gas-rich nearby interacting galaxies, as well as the environmental dependence of star formation and galaxy morphology in a galaxy supercluster. This thesis is composed of three individual projects that investigate nearby star formation within the local 500 pc of our Sun, to neighboring extreme star forming environments of interacting starburst galaxies, and finally studying how star formation varies with galaxy morphology in a galaxy supercluster a z~0.165. I discuss the relation between the star formation rate (SFR) and molecular gas surface densities (e.g., Schmidt-Kennicutt relation) in Galactic star forming regions and find there is a discrepancy between my study and extragalactic relations. The discrepancy is attributed to extragalactic measurements that are averaged over large>kpc scales and include star forming molecular gas (above some threshold) and molecular gas the is not dense enough to form stars. I find a steep increase in the Galactic SFR-gas surface density relation indicative of a threshold for efficient star formation that is best fit to a broken power law with a linear slope above 129 Msun pc−2. I introduce the VIRUS-P Investigation of the eXtreme ENviroments of Starbursts (VIXENS) project which is a survey of interacting is a large integral field unit survey of nearby infrared bright (L_IR>3x1010 Lsun) interacting/starburst galaxies. The main goal of VIXENS is to investigate the relation between star formation and gas content on spatially resolved scales of ~0.1-1 kpc in the extreme star forming environments of interacting/starburst galaxies. The VIXENS sample is composed of systems in a range interaction stages with morphological signatures from early phase (close pairs) to late stage mergers (single system with multiple nuclei), SFRs, and gas surface densities. I highlight the first results from the VIXENS survey in the late interaction phase galaxy merger Arp 299. I find 1.3 kpc regions in Arp 299 to lie along the SFR-gas surface density relation found for mergers at high redshift, but this relation is highly dependent on the CO to molecular hydrogen (H2) conversion factor. I find evidence for a Galactic CO-to-H2 conversion factor using metallicity and dust temperature measurements, which would place 1.3 kpc regions in the Arp 299 merger in between the high redshift and Kennicutt-Schmidt relations. Comparing the SFR to dense gas surface densities as traced by HCN and HCO, I find an agreement between the spatially resolved measurements and that found on global scales in spirals and (ultra)luminous infrared galaxies. Finally, I present an investigation of the influence of environment on frequency, distribution, color, and star formation properties of galaxy mergers and non-interacting galaxies in the Abell 901/902 supercluster at z~0.165. I find galaxy mergers be preferentially blue in color and have an enhanced SFR by a factor of ~2 compared to non-interacting galaxies. This result may be due to a decrease in galaxy velocity dispersion in the cluster outskirt, favoring galaxy-galaxy interactions, or to interacting galaxies that are part of groups or field galaxies being accreted along cosmological filaments by the clusters. I compare to N-body simulations of groups and field galaxies accreting onto the clusters and find the fraction of mergers are similar to that predicated at group overdensities. I find the SFR of galaxies in the supercluster to be depressed compared to field galaxies in both the core and cluster outskirts, suggesting that an environmental process such as ram pressure stripping is effective throughout the cluster. The results of a modest SFR enhancement and a low merger fraction culminate in my finding that mergers contribute only a small fraction (between 10% and 15%) of the total SFR density of the Abell 901/902 clusters.

Star Formation In Galaxies

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Author :
language : en
Publisher:
Release Date : 1987

Star Formation In Galaxies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Astrophysics categories.

Star Formation And Feedback In Simulations Of Interacting Galaxies

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Author : Thomas J. Cox
language : en
Publisher:
Release Date : 2004

Star Formation And Feedback In Simulations Of Interacting Galaxies written by Thomas J. Cox and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Star Formation In A Sample Of Interacting Galaxies

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Author : Eija Laurikainen
language : en
Publisher:
Release Date : 1989

Star Formation In A Sample Of Interacting Galaxies written by Eija Laurikainen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

Cosmic Collisions

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Author : Lars Lindberg Christensen
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-04-07

Cosmic Collisions written by Lars Lindberg Christensen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-04-07 with Science categories.

Like no other telescope ever invented, the NASA/ESA Hubble Space Telescope has given us magnificent high resolution views of the gigantic cosmic collisions between galaxies. Hubble's images are snapshots in time and catch the colliding galaxies in different stages of collision. Thanks to a new and amazing set of 60 Hubble images, for the first time these different stages can be put together to form a still-frame movielike montage showing the incredible processes taking place as galaxies collide and merge. The significance of these cosmic encounters reaches far beyond aesthetics. Galaxy mergers may, in fact, be some of the most important processes that shape our universe. Colliding galaxies very likely, hold some of the most important clues to our cosmic past and to our destiny. It now seems clear that the Milky Way is continuously undergoing merging events, some small scale, others on a gigantic scale. And the importance of this process in the lives of galaxies is much greater than what was previously thought.

Paired And Interacting Galaxies

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Author : International Astronomical Union. Colloquium
language : en
Publisher:
Release Date : 1990

Paired And Interacting Galaxies written by International Astronomical Union. Colloquium and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Galaxies categories.

The Interstellar Medium And Star Formation In Interacting Galaxies

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Author : Marcel Spencer Clemens
language : en
Publisher:
Release Date : 1999

The Interstellar Medium And Star Formation In Interacting Galaxies written by Marcel Spencer Clemens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

The Star Formation And Merger Evolution Of Interacting Galaxies

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Author : Carrie Ruth Bridge
language : en
Publisher:
Release Date : 2007

The Star Formation And Merger Evolution Of Interacting Galaxies written by Carrie Ruth Bridge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Hierarchical models and observations show that galaxy mergers and interactions play a key role in galaxy assembly and star formation, but to what extent is still unclear. This thesis attempts to quantify their contribution to galaxy evolution by probing the number of interactions and mergers, along with their star forming properties as a function of redshift. The presence of long tidal tails and bridges are robust signatures of recent merger activity. This completely dynamical phenomenon was used to develop a new classification scheme to identify interacting galaxies and probe the interaction fraction and merger rate. We applied this new technique to large area, multi-band imaging obtained via the Canada France Hawaii Telescope Legacy Survey (CFHTLS-Deep), yielding the first statistically secure, lower limit of the galaxy interaction fraction between 0.1 z 1.0. Optically, the fraction of galaxies undergoing an interaction evolves moderately with redshift as (1 + z)2.24+/-0.24The Spitzer 24mum coverage of both the Extragalactic First Look Survey (XFLS) and CFHTLSDeep Survey were used to carry out one of the first and largest merger studies of IR bright galaxies. Within the ACS component of the XFLS, interactions were identified over the full merger sequence using traditional techniques, finding a merger rate increase for 24microm galaxies of (1 + z) & sim;2. This result implies that merging is an increasingly important process in the evolution of luminous IR galaxies (LIRGs), contributing 40--60% of the IR luminosity density and at least 30--40% of the star formation rate density at z & sim; 1. Galaxy interactions at all stages are found to have elevated star formation rates greater than a factor of two-four (on average) and a higher incidence of AGN activity compared to non-interacting field galaxies. This result supports a causal connection between galaxy merging, induced star formation, and AGN activity. Ultimately, major mergers provide a moderate contribution to the evolution of the cosmic star formation rate density and IR luminosity density to z & sim; 1, with an increasing trend suggesting that merging plays a larger role at higher redshifts (z 1). It is also clear that merging plays a significant role in triggering the processes that power the IR emission of LIRG galaxies at z 0.5.