Where stars form: inside-out growth and coherent star formation from
... for a large sample of galaxies. An ideal dataset would also contain broadband optical imaging with the same high spatial resolution to allow for robust comparison of the spatial distribution of ionized gas and stellar continuum emission. This has now become possible with the WFC3 grism capability on ...
... for a large sample of galaxies. An ideal dataset would also contain broadband optical imaging with the same high spatial resolution to allow for robust comparison of the spatial distribution of ionized gas and stellar continuum emission. This has now become possible with the WFC3 grism capability on ...
Chapter 5 The Evolutionary Paths Of Nearby Galaxies
... constant, despite continued star formation over several Gyr (Bell et al., 2007; Faber et al., 2007). A possible explanation of this is that galaxies form most of their stars while they are in the blue cloud but then migrate to the red sequence, gradually increasing the stellar mass retained in quies ...
... constant, despite continued star formation over several Gyr (Bell et al., 2007; Faber et al., 2007). A possible explanation of this is that galaxies form most of their stars while they are in the blue cloud but then migrate to the red sequence, gradually increasing the stellar mass retained in quies ...
Star Formation in Galaxies Along the Hubble Sequence
... fully, with the development of more precise direct SFR diagnostics, including integrated emissionline fluxes (Cohen 1976, Kennicutt 1983a), near-ultraviolet continuum fluxes (Donas & Deharveng 1984), and infrared continuum fluxes (Harper & Low 1973, Rieke & Lebofsky 1978, Telesco & Harper 1980). The ...
... fully, with the development of more precise direct SFR diagnostics, including integrated emissionline fluxes (Cohen 1976, Kennicutt 1983a), near-ultraviolet continuum fluxes (Donas & Deharveng 1984), and infrared continuum fluxes (Harper & Low 1973, Rieke & Lebofsky 1978, Telesco & Harper 1980). The ...
Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry
... dwarf elliptical and dwarf irregular galaxies can be traced to the cessation of star formation activity rather than to dynamical differences between the two classes. In support of this, Skillman et al. (2003) note that the star formation histories of dwarf elliptical galaxies may be very similar to ...
... dwarf elliptical and dwarf irregular galaxies can be traced to the cessation of star formation activity rather than to dynamical differences between the two classes. In support of this, Skillman et al. (2003) note that the star formation histories of dwarf elliptical galaxies may be very similar to ...
T3-Cosmic Star Formation History
... Universe was only 3% of its current age. Following the seminal work of Steidel et al. (1996), color-selection criteria that are sensitive to the presence of intergalactic HI absorption features in the spectral energy distribution (SED) of distant sources have been used to build increasingly large sa ...
... Universe was only 3% of its current age. Following the seminal work of Steidel et al. (1996), color-selection criteria that are sensitive to the presence of intergalactic HI absorption features in the spectral energy distribution (SED) of distant sources have been used to build increasingly large sa ...
Here - Cornell Astronomy
... taught during the fall semester of 2008 by Professors Don Campbell and Martha Haynes with the always willing and able assistance of Astronomy graduate student Kassie Wells. In addition to providing an overview of the diverse science that is based on observations made with the Arecibo telescope, Astr ...
... taught during the fall semester of 2008 by Professors Don Campbell and Martha Haynes with the always willing and able assistance of Astronomy graduate student Kassie Wells. In addition to providing an overview of the diverse science that is based on observations made with the Arecibo telescope, Astr ...
Spectro-Morphology of Galaxies.
... Abstract. We present a quantitative method to classify galaxies, based on multiwavelength data and elaborated from the properties of nearby galaxies. Our objective is to define an evolutionary method that can be used for low and high redshift objects. We estimate the concentration of light (C) at th ...
... Abstract. We present a quantitative method to classify galaxies, based on multiwavelength data and elaborated from the properties of nearby galaxies. Our objective is to define an evolutionary method that can be used for low and high redshift objects. We estimate the concentration of light (C) at th ...
SPICA Yellow Book
... chemistry of these objects to be studied by remote sensing to an unprecedented level of detail, for the first time allowing us to link our own “debris” to that seen in the formation of planetary systems around other stars. Theme 4: “How did the Universe originate and what is it made of?” SPICA will ...
... chemistry of these objects to be studied by remote sensing to an unprecedented level of detail, for the first time allowing us to link our own “debris” to that seen in the formation of planetary systems around other stars. Theme 4: “How did the Universe originate and what is it made of?” SPICA will ...
Mapping the Pathways of Galaxy Transformation Across Time and
... quiescence. Many show signs of a recent galaxy-galaxy merger and a newly-evolved stellar bulge, and most have LINER-like emission, which may indicate low luminosity AGN activity. Thus, the study of this short-lived phase of galaxy evolution can address the connections among mergers, star formation h ...
... quiescence. Many show signs of a recent galaxy-galaxy merger and a newly-evolved stellar bulge, and most have LINER-like emission, which may indicate low luminosity AGN activity. Thus, the study of this short-lived phase of galaxy evolution can address the connections among mergers, star formation h ...
Probing nuclear activity versus star formation at z ∼ 0.8 using near
... this is the largest compilation of NIR spectra of active galactic nuclei (AGN) at this redshift. The data were obtained using the multi-object spectroscopic mode of the Long-slit Intermediate Resolution Infrared Spectrograph (LIRIS) at the 4.2 m William Herschel Telescope (WHT). These galaxies are r ...
... this is the largest compilation of NIR spectra of active galactic nuclei (AGN) at this redshift. The data were obtained using the multi-object spectroscopic mode of the Long-slit Intermediate Resolution Infrared Spectrograph (LIRIS) at the 4.2 m William Herschel Telescope (WHT). These galaxies are r ...
2 Justification and benefits in joining TMT
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
Observational evidence for AGN feedback in early
... and assemble the last, contrary to what has been deduced from observations. For a critical example, these models struggle to match the observed chemical abundance ratios and their trends with galaxy mass (Thomas 1999; Nagashima et al. 2005). The reason for this failure in the early models is that SF ...
... and assemble the last, contrary to what has been deduced from observations. For a critical example, these models struggle to match the observed chemical abundance ratios and their trends with galaxy mass (Thomas 1999; Nagashima et al. 2005). The reason for this failure in the early models is that SF ...
Science Case for the Chinese Participation of TMT
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
Article PDF - IOPscience
... than average star formation as compared to galaxies in the nearby universe, we examine the morphological properties of five nearby starburst galaxies that are generally regarded as the best analogs of high-redshift star-forming systems (e.g., Conselice et al. 2000a, 2000c). These five galaxies have be ...
... than average star formation as compared to galaxies in the nearby universe, we examine the morphological properties of five nearby starburst galaxies that are generally regarded as the best analogs of high-redshift star-forming systems (e.g., Conselice et al. 2000a, 2000c). These five galaxies have be ...
studies - European Southern Observatory
... nearby satellites, non-equilibrium motions caused by variations in the amount and/or the direction of the baryonic accretion (Methods). We find interacting low mass satellites in three of our six sources and evidence for some tidal stripping in one, but the rotation curve is symmetric, even near the ...
... nearby satellites, non-equilibrium motions caused by variations in the amount and/or the direction of the baryonic accretion (Methods). We find interacting low mass satellites in three of our six sources and evidence for some tidal stripping in one, but the rotation curve is symmetric, even near the ...
Galaxies - hwchemistry
... of galaxies, however, they find that the measured masses are much larger than expected from the luminosities of the galaxies. • This seems to be true of most galaxies. – Measured masses of galaxies amount to 10 to 100 times more mass than you would expect from the appearance of galaxies. ...
... of galaxies, however, they find that the measured masses are much larger than expected from the luminosities of the galaxies. • This seems to be true of most galaxies. – Measured masses of galaxies amount to 10 to 100 times more mass than you would expect from the appearance of galaxies. ...
Far-ultraviolet and far-infrared bivariate luminosity function of galaxies:
... star formation rate (hereafter SFR) has been of central importance to an understanding of the formation and evolution of galaxies. However, this has been a difficult task for a long time because of dust extinction. Active star formation (SF) is always accompanied by dust production through various d ...
... star formation rate (hereafter SFR) has been of central importance to an understanding of the formation and evolution of galaxies. However, this has been a difficult task for a long time because of dust extinction. Active star formation (SF) is always accompanied by dust production through various d ...
Galaxies
... halos cools and collapses to form stars, and how the energy from star formation can feed back into the surrounding gas and regulate subsequent star formation. However, at a fundamental level we still lack a solid understanding of the basic physics of galaxy evolution. We do not know for certain that ...
... halos cools and collapses to form stars, and how the energy from star formation can feed back into the surrounding gas and regulate subsequent star formation. However, at a fundamental level we still lack a solid understanding of the basic physics of galaxy evolution. We do not know for certain that ...
book_text4
... operation in orbit. Seventeen years later when I received my first data, I was quite staggered by the quality of the images and also by the totally new science which they revealed about the ways in which relativistic jets can illuminate the environments of active galaxies. This is a repeated theme i ...
... operation in orbit. Seventeen years later when I received my first data, I was quite staggered by the quality of the images and also by the totally new science which they revealed about the ways in which relativistic jets can illuminate the environments of active galaxies. This is a repeated theme i ...
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?) ...
A Spectroscopically Confirmed Excess of 24 micron Sources in a
... to determine rest-frame absolute magnitudes (Vega) and Kcorrections. As input, we use the MAG− AUTO photometry from the g′ BV r′ R imaging and assumed minimum photometric uncertainties in each bandpass of 0.05 mag. The photometry has been corrected for foreground Galactic extinction using the Schleg ...
... to determine rest-frame absolute magnitudes (Vega) and Kcorrections. As input, we use the MAG− AUTO photometry from the g′ BV r′ R imaging and assumed minimum photometric uncertainties in each bandpass of 0.05 mag. The photometry has been corrected for foreground Galactic extinction using the Schleg ...
2. The X-ray-Radio correlation for bulgeless galaxies
... Correlations between the X-ray and Radio emissions are observed for both galaxies with Active Galactic Nuclei (AGN) and in Star Forming galaxies. For the first case, the Xray/Radio correlation seems to present different slopes for Radio-loud and Radio-quiet AGN and may be used to estimate the mass o ...
... Correlations between the X-ray and Radio emissions are observed for both galaxies with Active Galactic Nuclei (AGN) and in Star Forming galaxies. For the first case, the Xray/Radio correlation seems to present different slopes for Radio-loud and Radio-quiet AGN and may be used to estimate the mass o ...
witnessing the birth of the red sequence
... Herschel extragalactic imaging surveys such as HerschelATLAS (Eales et al. 2010) and HerMES (Oliver et al. 2010) have covered about 1000 deg2 to the SPIRE confusion limit. As a consequence, the number of known dusty starbursts has increased from several hundred to several hundred thousand. Most of t ...
... Herschel extragalactic imaging surveys such as HerschelATLAS (Eales et al. 2010) and HerMES (Oliver et al. 2010) have covered about 1000 deg2 to the SPIRE confusion limit. As a consequence, the number of known dusty starbursts has increased from several hundred to several hundred thousand. Most of t ...
Quasar
Quasars (/ˈkweɪzɑr/) or quasi-stellar radio sources are the most energetic and distant members of a class of objects called active galactic nuclei (AGN). Quasars are extremely luminous and were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that appeared to be similar to stars, rather than extended sources similar to galaxies. Their spectra contain very broad emission lines, unlike any known from stars, hence the name ""quasi-stellar."" Their luminosity can be 100 times greater than that of the Milky Way. Most quasars were formed approximately 12 billion years ago caused by collisions of galaxies and their central black holes merging to form either a supermassive black hole or a Binary black hole system.Although the true nature of these objects was controversial until the early 1980s, there is now a scientific consensus that a quasar is a compact region in the center of a massive galaxy surrounding a central supermassive black hole. Its size is 10–10,000 times the Schwarzschild radius of the black hole. The energy emitted by a quasar derives from mass falling onto the accretion disc around the black hole.