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 ...
A Universal Stellar Initial Mass Function? A Critical Look Further
... Way! Elmegreen & Scalo (2006) provide a detailed exploration of the degeneracies involved in inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the plac ...
... Way! Elmegreen & Scalo (2006) provide a detailed exploration of the degeneracies involved in inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the plac ...
harlow shapley - National Academy of Sciences
... variables found in these clusters. Curtis favored much reduced distances for these stars, based on intrinsically very much fainter absolute brightnesses. Shapley clearly came out the winner in the first part of the debate; however, there was a second side. Shapley and Curtis each discussed their vie ...
... variables found in these clusters. Curtis favored much reduced distances for these stars, based on intrinsically very much fainter absolute brightnesses. Shapley clearly came out the winner in the first part of the debate; however, there was a second side. Shapley and Curtis each discussed their vie ...
Digital Universe Guide - American Museum of Natural History
... point your computer will grind to a halt). If your machine freezes, either shrink the window or close it (press ESC) and wait for your computer to catch up. ...
... point your computer will grind to a halt). If your machine freezes, either shrink the window or close it (press ESC) and wait for your computer to catch up. ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... relative to the field, and account for nearly 90% of the overall star formation activity in high-redshift clusters. While high-redshift early-type galaxies are substantially quenched relative to cluster late-types, they still contribute ∼13% of the total cluster star formation activity. With early-t ...
... relative to the field, and account for nearly 90% of the overall star formation activity in high-redshift clusters. While high-redshift early-type galaxies are substantially quenched relative to cluster late-types, they still contribute ∼13% of the total cluster star formation activity. With early-t ...
Astronomy Astrophysics
... The procedure employed for determining the fundamental cluster parameters such as age, reddening, and distance is described in Borissova et al. (2011) and Chené et al. (2012, 2013). As described in Borissova et al. (2011), we used the field-star decontamination algorithm of Bonatto & Bica (2010), wh ...
... The procedure employed for determining the fundamental cluster parameters such as age, reddening, and distance is described in Borissova et al. (2011) and Chené et al. (2012, 2013). As described in Borissova et al. (2011), we used the field-star decontamination algorithm of Bonatto & Bica (2010), wh ...
X. Nuclear star clusters in low-mass early-type galaxies
... At faint magnitudes, the dominant noise is a combination of the readnoise and the sky background noise with a small contribution of Poisson noise from the host galaxy (see also Section 4.3 and Fig. 6). For a host galaxy absolute magnitude MF814W = −13 mag, the difference between the host galaxy magn ...
... At faint magnitudes, the dominant noise is a combination of the readnoise and the sky background noise with a small contribution of Poisson noise from the host galaxy (see also Section 4.3 and Fig. 6). For a host galaxy absolute magnitude MF814W = −13 mag, the difference between the host galaxy magn ...
to - NexStar Resource Site
... one. Bode’s Galaxy, a nice ‘Spiral’ & the Cigar Galaxy, the only ‘Irregular’ Galaxy in Messier’s catalogue, can both be found in the constellation Ursa Major. Both are estimated to be about 12 million ly’s distant (or more) and come in at about 6.9 & 8.4 mag. respectively. It is believed that a few ...
... one. Bode’s Galaxy, a nice ‘Spiral’ & the Cigar Galaxy, the only ‘Irregular’ Galaxy in Messier’s catalogue, can both be found in the constellation Ursa Major. Both are estimated to be about 12 million ly’s distant (or more) and come in at about 6.9 & 8.4 mag. respectively. It is believed that a few ...
OBSERVATIONS OF PHYSICAL PROCESSES IN
... cluster galaxies (BCGs) of those clusters. It has been known for a while that the state of the hot intracluster medium (ICM) gas in the core of a galaxy cluster, quantified as the central entropy of the gas, can be found in two particular states. Galaxy clusters with central entropies greater than 3 ...
... cluster galaxies (BCGs) of those clusters. It has been known for a while that the state of the hot intracluster medium (ICM) gas in the core of a galaxy cluster, quantified as the central entropy of the gas, can be found in two particular states. Galaxy clusters with central entropies greater than 3 ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... Supernovae of Type Ia (SNe Ia) are the thermonuclear explosions of carbon-oxygen white dwarf (CO WD) stars, commonly used as cosmological standard candles although their progenitor scenario is not yet well understood (e.g., Howell 2011). Most likely, the WD is in a binary system with either another ...
... Supernovae of Type Ia (SNe Ia) are the thermonuclear explosions of carbon-oxygen white dwarf (CO WD) stars, commonly used as cosmological standard candles although their progenitor scenario is not yet well understood (e.g., Howell 2011). Most likely, the WD is in a binary system with either another ...
solon irving bailey - National Academy of Sciences
... with the delightful experiences of actually seeing celestial acquaintances of many years, such as the great star fields of Carina, the Southern Cross, and the brilliant Sagittarius rising over the Andes, was blended the pleasure of visiting the Land of the Incas with such expert guides, and of becom ...
... with the delightful experiences of actually seeing celestial acquaintances of many years, such as the great star fields of Carina, the Southern Cross, and the brilliant Sagittarius rising over the Andes, was blended the pleasure of visiting the Land of the Incas with such expert guides, and of becom ...
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 ...
arXiv:astro-ph/0701557v1 19 Jan 2007
... We investigate the stellar populations in the star forming ring of the luminous infrared galaxy NGC 7469. We use Hubble Space Telescope multi-wavelength (UV through NIR) imaging complemented with new K-band ground-based long-slit spectroscopy, and mid-IR and radio maps from the literature. Spectral ...
... We investigate the stellar populations in the star forming ring of the luminous infrared galaxy NGC 7469. We use Hubble Space Telescope multi-wavelength (UV through NIR) imaging complemented with new K-band ground-based long-slit spectroscopy, and mid-IR and radio maps from the literature. Spectral ...
Sample pages 1 PDF
... especially nearby, a mere 1,300 light years away. It is visible even to the naked eye, as a fuzzy patch halfway down the Sword of Orion asterism. A small telescope reveals its two brightest regions, the larger of which is M42 (NGC 1976) and the other M43 (NGC 1982). The Orion Molecular Cloud Complex ...
... especially nearby, a mere 1,300 light years away. It is visible even to the naked eye, as a fuzzy patch halfway down the Sword of Orion asterism. A small telescope reveals its two brightest regions, the larger of which is M42 (NGC 1976) and the other M43 (NGC 1982). The Orion Molecular Cloud Complex ...
Galaxies - WordPress.com
... A an enormous luminous cloud of gas and dust in the interstellar space. B a collection of planets with a parent star similar to the solar system. C a collection of hundreds of billions of stars sometimes called a galaxy. D a figment of the imagination of early astronomers like, the "seas" of the moo ...
... A an enormous luminous cloud of gas and dust in the interstellar space. B a collection of planets with a parent star similar to the solar system. C a collection of hundreds of billions of stars sometimes called a galaxy. D a figment of the imagination of early astronomers like, the "seas" of the moo ...
PDF - ASSA
... radiation from the O-type stars. On their exposed surfaces, pillars are created. Some of the pillars detach from their parent molecular cloud creating isolated globules, often with a young star located near the apex of the globule. A new study of the region, A Survey of Irradiated Pillars, Globules, ...
... radiation from the O-type stars. On their exposed surfaces, pillars are created. Some of the pillars detach from their parent molecular cloud creating isolated globules, often with a young star located near the apex of the globule. A new study of the region, A Survey of Irradiated Pillars, Globules, ...
Clusters: age scales for stellar physics
... struggled for years and tried not to publish his data. So, although by definition the length of the meridian should have been 10,000,000 meters (actually, the other way around), the actual length is 10,002,290 meter. The culprit, actually, falls on the Directory, who rushed the publication of the pr ...
... struggled for years and tried not to publish his data. So, although by definition the length of the meridian should have been 10,000,000 meters (actually, the other way around), the actual length is 10,002,290 meter. The culprit, actually, falls on the Directory, who rushed the publication of the pr ...
Stars & Galaxies - newmanlib.ibri.org
... • These are called galactic because they lie near the plane of our galaxy. • They are called open because they are not as tightly packed as globular clusters. • There are about 500 of these in our part of the galaxy. • They have typically 20-300 stars. ...
... • These are called galactic because they lie near the plane of our galaxy. • They are called open because they are not as tightly packed as globular clusters. • There are about 500 of these in our part of the galaxy. • They have typically 20-300 stars. ...
Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... evolution in GCs. With a collection of high resolution spectra for a large sample of cluster stars, we can shed light on the complex scene where this initial evolution occurred, possibly in the core of giant clouds/associations or even, in the case of the most massive clusters such as M 54, of dwarf ...
... evolution in GCs. With a collection of high resolution spectra for a large sample of cluster stars, we can shed light on the complex scene where this initial evolution occurred, possibly in the core of giant clouds/associations or even, in the case of the most massive clusters such as M 54, of dwarf ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... figure 375 million thus refers to the additional new galaxies observable when the Hale telescope was put into operation, not the number of galaxies in the master universe. Recently the Hubble Space Telescope made two deep field images, in the region of the North Pole, and another in the region of th ...
... figure 375 million thus refers to the additional new galaxies observable when the Hale telescope was put into operation, not the number of galaxies in the master universe. Recently the Hubble Space Telescope made two deep field images, in the region of the North Pole, and another in the region of th ...
The Norma cluster (ACO3627) – II. The near-infrared Ks
... tages. While star-forming regions are bright at optical wavelengths, making optical observations particularly sensitive to galaxies where star formation is taking place, the NIR is much less affected by short bursts of star formation and therefore a better indicator of galaxy mass (Andreon & Pelló ...
... tages. While star-forming regions are bright at optical wavelengths, making optical observations particularly sensitive to galaxies where star formation is taking place, the NIR is much less affected by short bursts of star formation and therefore a better indicator of galaxy mass (Andreon & Pelló ...
What To See Telescope(Jul-Sept) v1 - One
... averted vision, and the hundreds more stars snap into view in an almost shocking manner. The cluster contains some 500,000 stars with an age of 13 billion years, not much younger than the universe itself. While M13 lies a distant 25,000 light years from Earth, Kurt Vonnegut wrote, accurately, “Every ...
... averted vision, and the hundreds more stars snap into view in an almost shocking manner. The cluster contains some 500,000 stars with an age of 13 billion years, not much younger than the universe itself. While M13 lies a distant 25,000 light years from Earth, Kurt Vonnegut wrote, accurately, “Every ...
Colour-magnitude diagrams of the post
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
Star Formation in the Rosette Complex
... ship for a total of 30 cluster sources and to extend the list of known PMS candidates to 21. They subsequently identified members coincident with ROSAT point source catalogs and compared their properties to the rest of the sample. Six of the PMS candidates were confirmed as X-ray sources. In Figure ...
... ship for a total of 30 cluster sources and to extend the list of known PMS candidates to 21. They subsequently identified members coincident with ROSAT point source catalogs and compared their properties to the rest of the sample. Six of the PMS candidates were confirmed as X-ray sources. In Figure ...
The chemical enrichment of the ICM from hydrodynamical simulations
... important role in determining the ICM physical properties. Spatially resolved X–ray spectroscopy permits to measure the equivalent width of emission lines associated to transitions of heavily ionised elements and, therefore, to trace the pattern of chemical enrichment (e.g., Mushotzky 2004 for a rev ...
... important role in determining the ICM physical properties. Spatially resolved X–ray spectroscopy permits to measure the equivalent width of emission lines associated to transitions of heavily ionised elements and, therefore, to trace the pattern of chemical enrichment (e.g., Mushotzky 2004 for a rev ...
Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is derived from the Latin globulus—a small sphere. A globular cluster is sometimes known more simply as a globular.Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk. Globular clusters are fairly common; there are about 150 to 158 currently known globular clusters in the Milky Way, with perhaps 10 to 20 more still undiscovered. These globular clusters orbit the Galaxy at radii of 40 kiloparsecs (130,000 light-years) or more. Larger galaxies can have more: Andromeda, for instance, may have as many as 500. Some giant elliptical galaxies, particularly those at the centers of galaxy clusters, such as M87, have as many as 13,000 globular clusters.Every galaxy of sufficient mass in the Local Group has an associated group of globular clusters, and almost every large galaxy surveyed has been found to possess a system of globular clusters. The Sagittarius Dwarf galaxy and the disputed Canis Major Dwarf galaxy appear to be in the process of donating their associated globular clusters (such as Palomar 12) to the Milky Way. This demonstrates how many of this galaxy's globular clusters might have been acquired in the past.Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear. It does appear clear that globular clusters are significantly different from dwarf elliptical galaxies and were formed as part of the star formation of the parent galaxy rather than as a separate galaxy. However, recent conjectures by astronomers suggest that globular clusters and dwarf spheroidals may not be clearly separate and distinct types of objects.