Mapping the Dark Matter
... collection of stars at different evolutionary stages In galaxies we only see the integrated light ...
... collection of stars at different evolutionary stages In galaxies we only see the integrated light ...
Dust attenuation in galaxies up to redshift 2 V. Buat
... is well sampled with GALEX data. Buat et al. (2007) performed a statistical analysis of the GALEX and IRAS surveys and deduced volume corrected relations about farIR and FUV properties of galaxies in the nearby universe. Here, we use their UV selected sample to calculate the average far-IR to FUV fl ...
... is well sampled with GALEX data. Buat et al. (2007) performed a statistical analysis of the GALEX and IRAS surveys and deduced volume corrected relations about farIR and FUV properties of galaxies in the nearby universe. Here, we use their UV selected sample to calculate the average far-IR to FUV fl ...
Post-starburst galaxies: more than just an interesting curiosity
... 1997; Noeske et al. 2007; Tresse et al. 2007). However, the process, or processes, responsible for this gradual decline remain to be determined. What physical mechanisms cause a galaxy to stop forming stars, to turn into a spheroid, and thus to enter the red sequence? There are many competing theori ...
... 1997; Noeske et al. 2007; Tresse et al. 2007). However, the process, or processes, responsible for this gradual decline remain to be determined. What physical mechanisms cause a galaxy to stop forming stars, to turn into a spheroid, and thus to enter the red sequence? There are many competing theori ...
Near-uniform internal rotation of the main sequence γ Doradus
... tion of stars. We expect that stars are born with uniform rotation, as a consequence of thorough mixing throughout the star during the Hayashi contraction phase when the stars are fully convective. We further expect that, during evolution on the main sequence, conservation of angular momentum leads ...
... tion of stars. We expect that stars are born with uniform rotation, as a consequence of thorough mixing throughout the star during the Hayashi contraction phase when the stars are fully convective. We further expect that, during evolution on the main sequence, conservation of angular momentum leads ...
"The Pulsar Menagerie" (pdf file)
... by astrophysicists Walter Baade, Fritz of Gold’s model still reign today. Zwicky, and Lev Landau: an ultradense The Crab quickly rose to iconic status. neutron star, perhaps 20 kilometers across, But as it turns out, the pulsar is far from typleft by a massive star’s death in a superno- ical. It’s u ...
... by astrophysicists Walter Baade, Fritz of Gold’s model still reign today. Zwicky, and Lev Landau: an ultradense The Crab quickly rose to iconic status. neutron star, perhaps 20 kilometers across, But as it turns out, the pulsar is far from typleft by a massive star’s death in a superno- ical. It’s u ...
Mapping the Pathways of Galaxy Transformation Across Time and
... as and how we study core processes shaping galaxy life-cycles. As a lens, I use two outcomes from the IMACS Cluster-Building Survey: our finding that most z∼0.5 poststarbursts are rejuvenated passive galaxies, and a simple model positing that every galaxy has a lognormal SFH whose parameters are set ...
... as and how we study core processes shaping galaxy life-cycles. As a lens, I use two outcomes from the IMACS Cluster-Building Survey: our finding that most z∼0.5 poststarbursts are rejuvenated passive galaxies, and a simple model positing that every galaxy has a lognormal SFH whose parameters are set ...
Tycho Brahe
... • Using a sextant he observed that the new star was not moving in relationship to other stars. • This observation challenged the beliefs of the time that the heavens remain unchanged. ...
... • Using a sextant he observed that the new star was not moving in relationship to other stars. • This observation challenged the beliefs of the time that the heavens remain unchanged. ...
Astron 104 Laboratory #9 Cepheid Variable Stars
... Figure 1: How a Cepheid star changes brightness with time. function of time. Note that the vertical axis represents the apparent magnitude, which can be easily measured, not the absolute magnitude. Click anywhere on the plot to return to the view of the sky. To assist you in making accurate readings ...
... Figure 1: How a Cepheid star changes brightness with time. function of time. Note that the vertical axis represents the apparent magnitude, which can be easily measured, not the absolute magnitude. Click anywhere on the plot to return to the view of the sky. To assist you in making accurate readings ...
The white dwarf population within 40 pc of the Sun
... decades now that the evolution of white dwarfs is determined by a simple gravothermal process. However, although the basic picture of white dwarf evolution has remained unchanged for some time, we now have very reliable and accurate evolutionary tracks, which take into account all the relevant physi ...
... decades now that the evolution of white dwarfs is determined by a simple gravothermal process. However, although the basic picture of white dwarf evolution has remained unchanged for some time, we now have very reliable and accurate evolutionary tracks, which take into account all the relevant physi ...
12.1 Elliptical galaxies
... [slide 1] We now turn our attention to the other end of the Hubble sequence, the elliptical galaxies. [slide 2] In Hubble's definition, ellipticals were old, boring systems containing just old stars with no star formation. No dust. No gas. The first theories of their f ...
... [slide 1] We now turn our attention to the other end of the Hubble sequence, the elliptical galaxies. [slide 2] In Hubble's definition, ellipticals were old, boring systems containing just old stars with no star formation. No dust. No gas. The first theories of their f ...
ASTRONOMY AND ASTROPHYSICS Evolutionary models for solar
... curate theoretical models spanning a large range of ages, masses and metallicities. Important progress has been realized recently on the theoretical side, which emphasizes the complex physics involved in the modeling of these cool and dense objects. Recent work has demonstrated the necessity to use ...
... curate theoretical models spanning a large range of ages, masses and metallicities. Important progress has been realized recently on the theoretical side, which emphasizes the complex physics involved in the modeling of these cool and dense objects. Recent work has demonstrated the necessity to use ...
An Optical Study of Young Stellar Clusters
... Function (IMF) of the system (Salpeter, 1955; Scalo, 1986; Kroupa, 2002; Chabrier, 2003). Together with the time modulation of the star formation process, known as the star formation rate, it dictates the evolution and fate of stellar systems up to entire galaxies. The vast majority of stars are not ...
... Function (IMF) of the system (Salpeter, 1955; Scalo, 1986; Kroupa, 2002; Chabrier, 2003). Together with the time modulation of the star formation process, known as the star formation rate, it dictates the evolution and fate of stellar systems up to entire galaxies. The vast majority of stars are not ...
TOPS: Toward Other Planetary
... Science Working Group to formulate a strategy for the discovery and study of other planetary systems, considering both short-term and longterm aspects. The charter for this group included defining the interface between the study of planet formation processes and star formation. The range of consider ...
... Science Working Group to formulate a strategy for the discovery and study of other planetary systems, considering both short-term and longterm aspects. The charter for this group included defining the interface between the study of planet formation processes and star formation. The range of consider ...
solar twins and solar analogues in galactic surveys
... we call a solar twin a star that has the same observed parameters as the Sun within its errors. These stars can be used as stand-in suns when doing observations, as normal night-time telescopes are not built to be pointed at the Sun. There have been many searches for these twins and every one of the ...
... we call a solar twin a star that has the same observed parameters as the Sun within its errors. These stars can be used as stand-in suns when doing observations, as normal night-time telescopes are not built to be pointed at the Sun. There have been many searches for these twins and every one of the ...
Chapter 2 The HRS+ Sample 2.1 The Herschel Reference Survey
... large multiwavelength dataset for the HRS galaxies has been assembled from observations available across the range of the electromagnetic spectrum, from X-ray to radio data (see Table 4 in Boselli et al., 2010). There is a wealth of science that can be accomplished using just this ancillary dataset ...
... large multiwavelength dataset for the HRS galaxies has been assembled from observations available across the range of the electromagnetic spectrum, from X-ray to radio data (see Table 4 in Boselli et al., 2010). There is a wealth of science that can be accomplished using just this ancillary dataset ...
part iv - the war medal 1939-45
... as the Navy except that six months service anywhere at sea all qualify, provided that one or more voyages have been made in the defined area. Service in fishing ...
... as the Navy except that six months service anywhere at sea all qualify, provided that one or more voyages have been made in the defined area. Service in fishing ...
The Birth Environment of the Solar System
... giant planets is estimated to be about 20 percent (although larger fractions, perhaps up to 50 percent, remain possible). At this time, detection of planets with masses comparable to Earth is just out of reach for main-sequence stars (due to technical limitations). As a result, it is too early to as ...
... giant planets is estimated to be about 20 percent (although larger fractions, perhaps up to 50 percent, remain possible). At this time, detection of planets with masses comparable to Earth is just out of reach for main-sequence stars (due to technical limitations). As a result, it is too early to as ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.