Browsing by Title
Now showing items 9139-9158 of 24122
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Galaxy Clusters around Radio-loud Active Galactic Nuclei at 1.3 lt z lt 3.2 as seen by Spitzer
(2013-05-01)We report the first results from the Clusters Around Radio-Loud AGN program, a Cycle 7 and 8 Spitzer Space Telescope snapshot program to investigate the environments of a large sample of obscured and unobscured luminous ... -
Galaxy Evolution and the Redshift Desert
(2011-04-26)This thesis explores the evolution of galaxies from the onset of star formation shortly after the Big Bang until the present day. Particular emphasis lies on the redshift range z = 1.4 2.5, the so-called “redshift ... -
Galaxy evolution explorer ultraviolet color-magnitude relations and evidence of recent star formation in early-type galaxies
(2005-01-20)We have used the Galaxy Evolution Explorer UV photometric data to construct a first near-UV (NUV) color-magnitude relation (CMR) for the galaxies preclassified as early-type by Sloan Digital Sky Survey studies. The NUV CMR ... -
Galaxy Evolution in a z~3 Protocluster
(2017-07-27)Environment is known to have a significant impact on the evolution of galaxies. This is most evident in the local Universe, where the oldest and most massive galaxies are found at the of massive galaxy clusters. Current ... -
Galaxy formation: When the wind blows
(2015-03-25) -
The galaxy group NGC 507: newly detected AGN remnant plasma transported by sloshing
(2022-05-06)Jets from active galactic nuclei (AGN) are known to recurrently enrich their surrounding medium with mildly-relativistic particles and magnetic fields. Here, we present a detailed multi-frequency analysis of the nearby ... -
Galaxy merger histories and the role of merging in driving star formation at z>1
(2015-09-21)We use Horizon-AGN, a hydrodynamical cosmological simulation, to explore the role of mergers in the evolution of massive (M > 10^10 MSun) galaxies around the epoch of peak cosmic star formation (1zR(4:1 3 are 'blue' (i.e. ... -
Galaxy morphological classification in deep-wide surveys via unsupervised machine learning
(2019-10-26)Galaxy morphology is a fundamental quantity, that is essential not only for the full spectrum of galaxy-evolution studies, but also for a plethora of science in observational cosmology. While a rich literature exists on ... -
Galaxy pairs in the SDSS - XIII. The connection between enhanced star formation and molecular gas properties in galaxy mergers.
(2018-05-11)We investigate the connection between star formation and molecular gas properties in galaxy mergers at low redshift (z ≤ 0.06). The study we present is based on IRAM 30-m CO(1-0) observations of 11 galaxies with a close ... -
Galaxy zoo 2 : Detailed morphological classifications for 304,122 galaxies from the sloan digital sky survey
(2013-11-01)We present the data release for Galaxy Zoo 2 (GZ2), a citizen science project with more than 16 million morphological classifications of 304,122 galaxies drawn from the Sloan Digital Sky Survey (SDSS).Morphology is a ... -
Galaxy Zoo : Building the low-mass end of the red sequence with local post-starburst galaxies
(2012-02-01)We present a study of local post-starburst galaxies (PSGs) using the photometric and spectroscopic observations from the Sloan Digital Sky Survey and the results from the Galaxy Zoo project. We find that the majority of ... -
Galaxy Zoo : Dust and molecular gas in early-type galaxies with prominent dust lanes
(2012-06-01)We explore the properties of dust and associated molecular gas in 352 nearby (0.01 <z <0.07) early-type galaxies (ETGs) with prominent dust lanes, drawn from the Sloan Digital Sky Survey (SDSS). Two-thirds of these 'dusty ... -
Galaxy Zoo : Dust lane early-type galaxies are tracers of recent, gas-rich minor mergers
(2012-06-01)We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of active galactic nucleus (AGN) activity ... -
Galaxy Zoo : the dependence of the star formation-stellar mass relation on spiral disk morphology
(2015-03-19)We measure the stellar mass-star formation rate relation in star-forming disk galaxies at z1. Of the galaxies lying significantly above the M-SFR relation in the local Universe, more than 50% are mergers. We interpret this ... -
Galaxy zoo : The fundamentally different co-evolution of supermassive black holes and their early- and late-type host galaxies
(2010-01-01)We use data from the Sloan Digital Sky Survey and visual classifications of morphology from the Galaxy Zoo project to study black hole growth in the nearby universe (z <0.05) and to break down the active galactic nucleus ...