Galaxy Assembly through Mergers
... to make me smile and a word to comfort me. Thank you for being my safe haven. My friends have been the backbone of my life, especially in the last few years. Ana and Pedro, my partners in crime, thank you for bearing with me in the most turbulent of times, never leaving my side. I thank you for the ...
... to make me smile and a word to comfort me. Thank you for being my safe haven. My friends have been the backbone of my life, especially in the last few years. Ana and Pedro, my partners in crime, thank you for bearing with me in the most turbulent of times, never leaving my side. I thank you for the ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
... and on these scales the density fluctuations are small in size (rms fluctuations of the order ∼ 0.1 at 1 Gpc). However, on scales of the order of 10 Mpc, the density fluctuations are large (∼ 1). The most apparent overdensities are therefore on small scales, less than 10 Mpc which are the typical sc ...
... and on these scales the density fluctuations are small in size (rms fluctuations of the order ∼ 0.1 at 1 Gpc). However, on scales of the order of 10 Mpc, the density fluctuations are large (∼ 1). The most apparent overdensities are therefore on small scales, less than 10 Mpc which are the typical sc ...
... This paper reviews internal processes of secular evolution in disk galaxies. We concentrate on one important consequence: the buildup of dense central components that look like classical, i.e., merger-built bulges but that were made slowly by disks out of disk material. These are called pseudobulges ...
Hubble 2006: Science Year in Review
... Hubble’s most powerful camera, the Advanced Camera for Surveys (ACS), providing a tenfold improvement over WFPC2. The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrog ...
... Hubble’s most powerful camera, the Advanced Camera for Surveys (ACS), providing a tenfold improvement over WFPC2. The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrog ...
The VIMOS Ultra-Deep Survey (VUDS): Fast Increase in the Fraction
... star–forming galaxies (e.g., dust attenuation, SFR, stellar mass) in the local Universe. Hayes et al. (2014) and Atek et al. (2014) have found that Lyα photons escape more easily from galaxies with low dust content. At high redshift, although on samples that are much smaller than the one we use in t ...
... star–forming galaxies (e.g., dust attenuation, SFR, stellar mass) in the local Universe. Hayes et al. (2014) and Atek et al. (2014) have found that Lyα photons escape more easily from galaxies with low dust content. At high redshift, although on samples that are much smaller than the one we use in t ...
Worlds Beyond The Poles
... would have long since acquired land areas of the universe about us. There was no misinterpretation of signals by the seeker of 1926. He journeyed to the celestial beacons on the wings of extrasensory perception’s limitless necromancy. That magic permitted breaking through the long-established barrie ...
... would have long since acquired land areas of the universe about us. There was no misinterpretation of signals by the seeker of 1926. He journeyed to the celestial beacons on the wings of extrasensory perception’s limitless necromancy. That magic permitted breaking through the long-established barrie ...
environmental effects on galaxy evolution in nearby clusters
... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
Annual Report 2011 - Max Planck Institute for Astrophysics
... 1. General Information Source community. The Linux system is an inhouse developed special distribution, including the A(dvanced) F(ile) S(ystem), which allows completely transparent access to data and a high flexibility for system maintenance. For scientific work licensed software, e.g. for data red ...
... 1. General Information Source community. The Linux system is an inhouse developed special distribution, including the A(dvanced) F(ile) S(ystem), which allows completely transparent access to data and a high flexibility for system maintenance. For scientific work licensed software, e.g. for data red ...
Observational Studies of Interacting Galaxies and the Development
... expected value. Spectroscopically, the kinematic properties of close pair galaxies were studied to understand how star formation were quenched at z ∼ 0.5. I discovered that the number of red-red pairs are rare, which does not support the gravitational quenching mechanism suggested by the hot halo mo ...
... expected value. Spectroscopically, the kinematic properties of close pair galaxies were studied to understand how star formation were quenched at z ∼ 0.5. I discovered that the number of red-red pairs are rare, which does not support the gravitational quenching mechanism suggested by the hot halo mo ...
The most metal-poor galaxies
... the process of formation, because of their extreme metal under-abundance, more than 10 times less than solar, and even more extreme than that of HII regions found in the outskirts of spiral galaxies. At the time of this discovery the general wisdom that most galaxies (in particular the ellipticals) ...
... the process of formation, because of their extreme metal under-abundance, more than 10 times less than solar, and even more extreme than that of HII regions found in the outskirts of spiral galaxies. At the time of this discovery the general wisdom that most galaxies (in particular the ellipticals) ...
The visibility of Lyman Alpha Emitters: constraining reionization
... 2009). The value of fesc also remains poorly constrained with findings ranging from a few percent (e.g. Gnedin et al. 2008) up to 20 − 30% (e.g. Mitra et al. 2013) or even higher (e.g. Wise & Cen 2009). Third, only a fraction (fα ) of the Lyα photons produced inside a galaxy can escape out of it una ...
... 2009). The value of fesc also remains poorly constrained with findings ranging from a few percent (e.g. Gnedin et al. 2008) up to 20 − 30% (e.g. Mitra et al. 2013) or even higher (e.g. Wise & Cen 2009). Third, only a fraction (fα ) of the Lyα photons produced inside a galaxy can escape out of it una ...
GRB prompt emission
... Hosts! • Hosts of long GRBs are star-forming galaxies • GRBs trace the stellar distribution (in distance from galaxy center) • GRBs occur in dense environments (star forming regions?) ...
... Hosts! • Hosts of long GRBs are star-forming galaxies • GRBs trace the stellar distribution (in distance from galaxy center) • GRBs occur in dense environments (star forming regions?) ...
GRB prompt emission
... Hosts! • Hosts of long GRBs are star-forming galaxies • GRBs trace the stellar distribution (in distance from galaxy center) • GRBs occur in dense environments (star forming regions?) ...
... Hosts! • Hosts of long GRBs are star-forming galaxies • GRBs trace the stellar distribution (in distance from galaxy center) • GRBs occur in dense environments (star forming regions?) ...
Probing nuclear activity versus star formation at z ∼ 0.8 using near
... or obscured optical-to-infrared (IR) SEDs instead, practically indistinguishable from those of spiral/starburst galaxies (Alonso-Herrero et al. 2004, 2008; Rigby et al. 2006; Trump et al. 2009). The star formation activity in the hosts of AGN at z ∼ 1 has been studied by several authors using mid-in ...
... or obscured optical-to-infrared (IR) SEDs instead, practically indistinguishable from those of spiral/starburst galaxies (Alonso-Herrero et al. 2004, 2008; Rigby et al. 2006; Trump et al. 2009). The star formation activity in the hosts of AGN at z ∼ 1 has been studied by several authors using mid-in ...
THE UV-OPTICAL COLOR MAGNITUDE DIAGRAM. II. PHYSICAL
... quite clearly how the NUV r color covers a much wider magnitude range than g r. In addition, the g r color starts to saturate for red galaxies, while NUV r varies by more than 2 magnitudes. We see indications from these plots that rest-frame UV-optical colors correlate with Sersic index (and ...
... quite clearly how the NUV r color covers a much wider magnitude range than g r. In addition, the g r color starts to saturate for red galaxies, while NUV r varies by more than 2 magnitudes. We see indications from these plots that rest-frame UV-optical colors correlate with Sersic index (and ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... z ∼ 1.5 → 1.16, we find that new cluster early-type galaxies are likely being formed i ...
... z ∼ 1.5 → 1.16, we find that new cluster early-type galaxies are likely being formed i ...
Where stars form: inside-out growth and coherent star formation from
... We present Hα maps at 1 kpc spatial resolution for star-forming galaxies at z ∼ 1, made possible by the WFC3 grism on HST. Employing this capability over all five 3D-HST/CANDELS fields provides a sample of 2676 galaxies enabling a division into subsamples based on stellar mass and star formation rat ...
... We present Hα maps at 1 kpc spatial resolution for star-forming galaxies at z ∼ 1, made possible by the WFC3 grism on HST. Employing this capability over all five 3D-HST/CANDELS fields provides a sample of 2676 galaxies enabling a division into subsamples based on stellar mass and star formation rat ...
The universe of the coming ALMA revolution
... entire spectrum. The universe emits light in every invisible color, from radio waves to gamma rays, and studies conducted within each band of the spectrum contribute uniquely to our understanding. Only now has technology caught up with the dream of opening up a rich new vein of the spectrum to high- ...
... entire spectrum. The universe emits light in every invisible color, from radio waves to gamma rays, and studies conducted within each band of the spectrum contribute uniquely to our understanding. Only now has technology caught up with the dream of opening up a rich new vein of the spectrum to high- ...
SPICA Yellow Book
... of distant galaxies; however, its relatively warm telescope (between 82 and 90 K) greatly limits its sensitivity. A new much more sensitive mission reaching must therefore build on the work started by Herschel and gain a deeper understanding of the physics of the objects discovered there: i.e., to s ...
... of distant galaxies; however, its relatively warm telescope (between 82 and 90 K) greatly limits its sensitivity. A new much more sensitive mission reaching must therefore build on the work started by Herschel and gain a deeper understanding of the physics of the objects discovered there: i.e., to s ...
The correlation between galaxy morphology and star
... activity (z ∼ 2 − 3). Until relatively recently, most studies of galaxy morphologies at z > 2 have been performed at rest–frame ultraviolet (UV) wavelengths using optical imagers (such as HST/WFPC2 and HST/ACS). These works found that irregular or peculiar structures appear more common, and traditio ...
... activity (z ∼ 2 − 3). Until relatively recently, most studies of galaxy morphologies at z > 2 have been performed at rest–frame ultraviolet (UV) wavelengths using optical imagers (such as HST/WFPC2 and HST/ACS). These works found that irregular or peculiar structures appear more common, and traditio ...
2 Justification and benefits in joining TMT
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosit ...
... We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosit ...
FLARE SWG theme 3: high
... Large-scale clustering analyses with respect to galaxies – bias and constraints on BH seed formation? Mpc-scale environment around first quasars using FLARE IFU: co-eval galaxy and other z>6 quasar/AGN connections (multiple growing BHs)? Evidence for quasar outflows (e.g., broad CIV absorption troug ...
... Large-scale clustering analyses with respect to galaxies – bias and constraints on BH seed formation? Mpc-scale environment around first quasars using FLARE IFU: co-eval galaxy and other z>6 quasar/AGN connections (multiple growing BHs)? Evidence for quasar outflows (e.g., broad CIV absorption troug ...
Science Case for the Chinese Participation of TMT
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
Observable universe
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.