The Effect Of Environment On The Radio Far Infrared Correlation In Spiral Galaxies
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The Effect Of Environment On The Radio Far Infrared Correlation In Spiral Galaxies
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Author : Victor Andersen
language : en
Publisher:
Release Date : 1992
The Effect Of Environment On The Radio Far Infrared Correlation In Spiral Galaxies written by Victor Andersen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Infrared radiation categories.
Study Of The Far Infrared Fadio Correlation For An Optically Selected Sample Of Spiral Galaxies
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Author : Melanie L. Anderson
language : en
Publisher:
Release Date : 1990
Study Of The Far Infrared Fadio Correlation For An Optically Selected Sample Of Spiral Galaxies written by Melanie L. Anderson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Far Infrared And Radio Continuum Spatial Correlations In Ten Nearby Spiral Galaxies
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Author : Bryant Charles Heikkila
language : en
Publisher:
Release Date : 1995
Far Infrared And Radio Continuum Spatial Correlations In Ten Nearby Spiral Galaxies written by Bryant Charles Heikkila and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Radio astronomy categories.
Star Forming Galaxies
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Author : Andrew John Fitt
language : en
Publisher:
Release Date : 1990
Star Forming Galaxies written by Andrew John Fitt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Radio Galaxies And The Role Of Environment
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Author : Lu Shen
language : en
Publisher:
Release Date : 2019
Radio Galaxies And The Role Of Environment written by Lu Shen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This dissertation describes research performed in the field of observational astrophysics as part of the Observations of Redshift Evolution in Large Scale Environment (ORELSE) survey, an ongoing multi-wavelength imaging and spectroscopic campaign investigating galaxyevolution in the environments of large scale structures (LSSs) surrounding 16 known clusters at the redshift range of $0.6 [less than or equal to] z [less than or equal to] 1.3. The aim of this dissertation is to contextualize how environment influences galaxy evolution among radio-emitting galaxies and radio Active Galactic Nucleus (RAGN) in a wide dynamic range of environments over cosmic time. In each of the three main chapters I present a sample of radio galaxies and an analysis of the connection to their environments. In the first part of this dissertation I describe the context of radio galaxies, galaxy environments, and the current state of the ORELSE survey. This initial section will set the framework for the variety of studies presented in this thesis. In the second part of this dissertation I present three studies undertaken to investigate various aspects of radio galaxies and the role of there environments. The first of these studies is an investigation of radio galaxies that are cross-matched to spectroscopically-confirmed galaxies in the large scale structures in the five fields of the ORELSE survey. To appropriately classify radio galaxies and study the properties of them separately, a two stage classification method is designed, where radio galaxies are classified into three sub-classes: active galactic nucleus (AGN), Hybrid, and star-forming galaxy (SFG). AGN tend to be preferentially located in locally dense environments and in the cores of clusters/groups, while SFGs exhibit a strong preference for intermediate-density global environments, with these preferences persisting when comparing to galaxies of similar color and stellar mass. These result has important consequences for galaxy evolutionary scenarios, as these two types of galaxies are thought to be the beginning and the end of galaxy evolution. The second of these studies is an investigation of the quenching effect of radio AGN (RAGN) on their neighboring galaxies. In this study, an elevated fraction of quenched RAGN neighbors was found in the most dense local and cluster environments, compared to those of non-RAGN control samples matched to the RAGN population in colour, stellar mass, and local environment. This result suggests that RAGN residing within clusters might heat the intracluster medium (ICM) affecting both in situ star formation and any inflowing gas that remains in their neighbors. This work has important consequences for understanding AGN feedback out of their host galaxies, which is the subject of much debate among astronomers.The final study in this dissertation is a full investigation of the co-evolution of AGN and star formation in radio galaxies in eight ORELSE fields. This study was first motivated by the Hybrid population analyzed in the first study, whose properties suggested that they have coeval star-formation and AGN activity with high accretion efficiency. Combining radio with mid-infrared and far-infrared data available in the ORELSE survey, the AGN and star formation contributions to the total infrared luminosity are well constrained. I present evidence for AGN quenching of the star formation in a rapid timescale in an orbital motion around the clusters/groups. This result has important consequences for galaxy evolutionary scenarios by connecting the two processes that are difficult to separate observationally and are thought to be related.
Spectral Modeling Of Dusty Galaxies And Evolution Of The Far Infrared Radio Correlation
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Author : Douglas James Peter O'Rourke
language : en
Publisher:
Release Date : 2012
Spectral Modeling Of Dusty Galaxies And Evolution Of The Far Infrared Radio Correlation written by Douglas James Peter O'Rourke 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.
The Effect Of Environment On The Star Formation Efficiency Of Spiral Galaxies
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Author : Amy Rachel Lesser
language : en
Publisher:
Release Date : 1994
The Effect Of Environment On The Star Formation Efficiency Of Spiral Galaxies written by Amy Rachel Lesser and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Spiral galaxies categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
The Far Infrared To Radio Continuum Correlation For Nearby Star Forming Galaxies
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Author : Brett S. Wells
language : en
Publisher:
Release Date : 1997
The Far Infrared To Radio Continuum Correlation For Nearby Star Forming Galaxies written by Brett S. Wells and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Galaxies categories.
Study Of The Far Infrared Emission Of Nearby Spiral Galaxies
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Author : Willie Drouhet
language : en
Publisher:
Release Date : 2013
Study Of The Far Infrared Emission Of Nearby Spiral Galaxies written by Willie Drouhet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
In my PHD work I explored the links between the physical properties of interstellar dust and other components of nearby spiral galaxies especially their stellar content. I worked on 46 disk galaxies from KINGFISH with IRAC/MIPS/PACS/SPIRE maps (3.6 - 500 microns). A bias is usually introduced in estimating disk orientations by using only a single surface brightness isophote. Thus I devised different surface brightness levels separated by constant steps in surface brightness and extracted isophotes at these levels in all FIR maps as well as in all IRAC 4.5 microns maps. To further assess the coherence of the shapes of isophotes across galactic disks, I built a quantitative indicator of the difference in shape between two ellipses with same center and same semi-major axis.I defined an acceptable level of difference between isophote shapes, by comparing disk orientations found in litterature. Using this level, I found regions inside the galactic disks where the isophotal shapes are similar. From these, I extracted one disk orientation per wavelength band. I found in the vast majority of the disk galaxy maps, be it dominated by stellar or dust emission, that a large fraction of the isophotes I extracted are coherent with the idea of an underlying disk. Comparing, for each galaxy, disk orientations extracted at all wavelengths, I found evidence in 20 galaxies out of 46, that on radial ranges as large as 1/3 of the visible disk (as measured by R25), the shapes of isophotes are morphologically similar. Thus for these 20 galaxies I devised consistent disk orientations both for the stellar and dust content. These 20 galaxies are less luminous, less emitting in the IR w.r.t. the optical, less barred, and characterized by later stage types than average. I also found that the disk orientations devised by my photometric method yield results more similar to H-alpha kinematic orientations than other photometric studies based on a single isophote level.Using the orientations I found and H-alpha dynamics disk orientations, I averaged azimuthally surface brightnesses to produce radial spectral energy distributions (SED) profiles. Once fitted with a cosmic dust emission model, they resulted in radial profiles of dust and stellar content properties. I found the dust intercepted power to be proportionnal to the product of the total dust mass and the average ISRF shining on dust. This former quantity is better correlated with the bolometric stellar luminosity than any of the dust mass or the dust heating ISRF separately. Thus the old stellar populations may be an important heating source for dust. The power intercepted by dust is also very well correlated with the total infrared power. The dust intercepts a larger quantity of power coming from stars in more actively star forming galaxies.Dust exhibit radial mass surface density profiles less well described by Sersic functions than stellar ones. When both profiles are well fitted by Sersic functions, stellar density profiles have smaller half mass radii than the isophotal optical radius (R25) separately in later type galaxies, but also in more quiescent galaxies. Sersic index and half mass radius distributions have larger widths for dust than for stellar surface density profiles.I also found that the ratio of dust over stellar surface density is an important factor to explain the variations with galactic morphological type of the ratio of dust intercepted power over the power emitted by old stellar populations. This later link could be intertwined with spiral structure strength in stage types later than 2.