Image filtering
... Sky noise-limited: all pixels have equal variance. The flux measurement of the fitted profile is equivalent to a profile-weighted aperture photometry Star photon noise-limited: variance is proportional to the pixel values above the background level. The flux measurement of the fitted profile is ...
... Sky noise-limited: all pixels have equal variance. The flux measurement of the fitted profile is equivalent to a profile-weighted aperture photometry Star photon noise-limited: variance is proportional to the pixel values above the background level. The flux measurement of the fitted profile is ...
The Age Distribution of Potential Intelligent Life in the Milky Way
... programming language MATLAB (MathWorks, 2015) to determine which areas of the Galaxy’s disk may have been the most hospitable to life and when. This GCEM incorporated interstellar gas, star formation, supernovae and metallicity. The radial component of our simulated Galaxy covered the range 2.5-15 k ...
... programming language MATLAB (MathWorks, 2015) to determine which areas of the Galaxy’s disk may have been the most hospitable to life and when. This GCEM incorporated interstellar gas, star formation, supernovae and metallicity. The radial component of our simulated Galaxy covered the range 2.5-15 k ...
Joint formation of QSOs and spheroids: QSOs as clocks of star
... relationship between the formation of QSOs and their spheroid hosts, with particular emphasis on the timing of star formation in the hosts and the QSO shining. We derive the formation rate of the spheroids from the formation rate of the QSOs (Sections 2.1 and 2.2), taking into account the observatio ...
... relationship between the formation of QSOs and their spheroid hosts, with particular emphasis on the timing of star formation in the hosts and the QSO shining. We derive the formation rate of the spheroids from the formation rate of the QSOs (Sections 2.1 and 2.2), taking into account the observatio ...
New Double Stars from Asteroidal Occultations, 1971 - 2008
... The occultation is recorded as the sudden disappearance of the star, followed some seconds (or tens of seconds) later with a sudden reappearance of the star. For a small number of events, the occultation may involve: A partial drop in light, followed by a complete drop in light. The order of the lig ...
... The occultation is recorded as the sudden disappearance of the star, followed some seconds (or tens of seconds) later with a sudden reappearance of the star. For a small number of events, the occultation may involve: A partial drop in light, followed by a complete drop in light. The order of the lig ...
XLII RENCONTRES DE MORIOND WORKSHOP ON …
... The GRB redshift distribution • The spatial distribution of GRBs is a powerful probe of GRB rate evolution. • Potentially be used as an independent tracer of massive star formation in the early Universe. • Potentially be used to probe the evolution of GRB environments. ...
... The GRB redshift distribution • The spatial distribution of GRBs is a powerful probe of GRB rate evolution. • Potentially be used as an independent tracer of massive star formation in the early Universe. • Potentially be used to probe the evolution of GRB environments. ...
ALFALFA H-alpha: The Star-Formation-Rate Density
... Over one hundred billion stars lie in the Milky Way galaxy, a moderate-sized galaxy in a universe of roughly one hundred billion galaxies. These galaxies thus amount to 1022 (ten sextillion) stars in our Universe. The science of astronomy allows us to contemplate such grand numbers and to investigat ...
... Over one hundred billion stars lie in the Milky Way galaxy, a moderate-sized galaxy in a universe of roughly one hundred billion galaxies. These galaxies thus amount to 1022 (ten sextillion) stars in our Universe. The science of astronomy allows us to contemplate such grand numbers and to investigat ...
Nebulae.The Lagoon and Dumbbell Nebulae
... These layers expand in space, forming a temporary wrap around the star.). M27 Dumbbell is found by Charles Messier on the 12 of July 1764. He describes it as a nebula without a star that has oval shape. The name comes from John Herschel, an English astronomer, who observed the nebula in 1828 and com ...
... These layers expand in space, forming a temporary wrap around the star.). M27 Dumbbell is found by Charles Messier on the 12 of July 1764. He describes it as a nebula without a star that has oval shape. The name comes from John Herschel, an English astronomer, who observed the nebula in 1828 and com ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... We obtained Strömgren photometry of the open cluster NGC 7419 using ALFOSC on the Nordic Optical Telescope at the Roque de los Muchachos Observatory (La Palma, Spain) on the night of October 3, 2005. ALFOSC allows observations in different modes. In imaging mode the camera covers a field of 6. 5 × 6 ...
... We obtained Strömgren photometry of the open cluster NGC 7419 using ALFOSC on the Nordic Optical Telescope at the Roque de los Muchachos Observatory (La Palma, Spain) on the night of October 3, 2005. ALFOSC allows observations in different modes. In imaging mode the camera covers a field of 6. 5 × 6 ...
Dust and molecular gas in the most distant quasars
... • We are seeing the end of the active bulge building in these strong mm quasars ? – The stellar bulge with a mass of a few 1011 to 1012 Msun already exist. • Require measurements of the bulge dynamical mass. • Resolve the stellar bulge at near-IR wavelengths. ...
... • We are seeing the end of the active bulge building in these strong mm quasars ? – The stellar bulge with a mass of a few 1011 to 1012 Msun already exist. • Require measurements of the bulge dynamical mass. • Resolve the stellar bulge at near-IR wavelengths. ...
Galaxy Evolution
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
The HIRES science case
... Emerging results suggest that a large fraction of stars of solar-type stars host hot Neptune or super-Earth mass planets. Moreover the frequency of multiple planetary systems among these systems seems to be very large, most of small planet being observed in multi-planetary systems These unexpected d ...
... Emerging results suggest that a large fraction of stars of solar-type stars host hot Neptune or super-Earth mass planets. Moreover the frequency of multiple planetary systems among these systems seems to be very large, most of small planet being observed in multi-planetary systems These unexpected d ...
Using photometric analysis to determine characteristics of the V
... after the scientist who discovered it) whereby the pressure at the center will exceed the threshold for the carbon and oxygen nuclei to start to fuse uncontrollably [2]. This phenomenon results in a thermonuclear detonation of the star which explains the sudden increase in optical ...
... after the scientist who discovered it) whereby the pressure at the center will exceed the threshold for the carbon and oxygen nuclei to start to fuse uncontrollably [2]. This phenomenon results in a thermonuclear detonation of the star which explains the sudden increase in optical ...
Galaxy Evolution Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mauro Giavalisco
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
... times brighter than stars like the Sun, their total luminosity will approximately equal that of 2 × 1010 of these. Thus, during the star formation activity the galaxy increases its luminosity by ∼ 20%. Its colors also become bluer, because the radiation emitted by massive stars is very rich of light ...
Introduction
... The processes influencing galaxy evolution in the local universe are investigated using a dataset of multiwavelength observations for a new sample of galaxies. The sample is volume and mass limited, and includes galaxies of all morphological types inhabiting a range of different environments, from g ...
... The processes influencing galaxy evolution in the local universe are investigated using a dataset of multiwavelength observations for a new sample of galaxies. The sample is volume and mass limited, and includes galaxies of all morphological types inhabiting a range of different environments, from g ...
our knowledge of high-mass star formation at the dawn of - CEA-Irfu
... partners. Non-equal mass encounters, circumstellar disks, and binary components could decrease this number to about 106 pc−3 , but such stellar density is highly unlikely to be the general case of high-mass star-forming sites. ...
... partners. Non-equal mass encounters, circumstellar disks, and binary components could decrease this number to about 106 pc−3 , but such stellar density is highly unlikely to be the general case of high-mass star-forming sites. ...
Early-type stars in the core of the young open cluster Westerlund 2
... is dominated by strong and broad H Balmer lines. Weak absorption lines of He λλ 4388, 4471, Mg λ 4481 and Si λ 4552 are also seen. The He λ 4471/Mg λ 4481 intensity ratio indicates a spectral type B8-A0. The appearance of some weak metallic lines favours an A0 classification, whilst ...
... is dominated by strong and broad H Balmer lines. Weak absorption lines of He λλ 4388, 4471, Mg λ 4481 and Si λ 4552 are also seen. The He λ 4471/Mg λ 4481 intensity ratio indicates a spectral type B8-A0. The appearance of some weak metallic lines favours an A0 classification, whilst ...
black hole
... Massive stars use up their nuclear fuel at a furious rate and die after only a few million years. In contrast, the lowest-mass stars use their fuel sparingly and may be able to live hundreds of billions of years. Stars with different masses lead dramatically different lives and die in differen ...
... Massive stars use up their nuclear fuel at a furious rate and die after only a few million years. In contrast, the lowest-mass stars use their fuel sparingly and may be able to live hundreds of billions of years. Stars with different masses lead dramatically different lives and die in differen ...
Labeling the HR Diagram - Mastering Physics Answers
... Spectral type is related to surface temperature, with stars of spectral type O having the highest surface temperature and stars of spectral type M having the lowest surface temperature. In other words, spectral type increases to the left on the HR diagram. Now proceed to Part E to determine how the ...
... Spectral type is related to surface temperature, with stars of spectral type O having the highest surface temperature and stars of spectral type M having the lowest surface temperature. In other words, spectral type increases to the left on the HR diagram. Now proceed to Part E to determine how the ...
Teacher`s Guide - Cornell Science Inquiry Partnerships
... New York State Standards (Physical Setting/Earth Science Standards) o Standard 1: Analysis, Inquiry, and Design: Scientific Inquiry Key Idea 1: The central purpose of scientific inquiry is to develop explanations of natural phenomena in a continuing, creative process. Key Idea 2: Beyond the use ...
... New York State Standards (Physical Setting/Earth Science Standards) o Standard 1: Analysis, Inquiry, and Design: Scientific Inquiry Key Idea 1: The central purpose of scientific inquiry is to develop explanations of natural phenomena in a continuing, creative process. Key Idea 2: Beyond the use ...
The fate of black hole singularities and the parameters of the
... others, that the parameters of physics and cosmology can change at such initiations of universes. Let us make the more specific assumption that all the dimensionless parameters of the standard models of particle physics and cosmology change by small random increments at such events.4 Then we have t ...
... others, that the parameters of physics and cosmology can change at such initiations of universes. Let us make the more specific assumption that all the dimensionless parameters of the standard models of particle physics and cosmology change by small random increments at such events.4 Then we have t ...
The new Basel high-latitude field star survey of the Galaxy
... of the Galactic population components that were derived from the previous studies of seven fields mainly in the outer Galaxy (Buser et al. 1998, 1999, hereafter Papers I and II, respectively). Apart from the canonical structural parameters, we here explore some of the special conditions prevailing i ...
... of the Galactic population components that were derived from the previous studies of seven fields mainly in the outer Galaxy (Buser et al. 1998, 1999, hereafter Papers I and II, respectively). Apart from the canonical structural parameters, we here explore some of the special conditions prevailing i ...
CELESTIAL MANUAL:CELESTIAL MANUAL
... Abbreviations are not shown for the constellations Aps, Cha, Cir, Cru, Hyi, Men, Mus, Oct, Pav, TrA, Tue and Vol since they are included in the entire or nearly entire range of the celestial sphere unable to be viewed from 35° ...
... Abbreviations are not shown for the constellations Aps, Cha, Cir, Cru, Hyi, Men, Mus, Oct, Pav, TrA, Tue and Vol since they are included in the entire or nearly entire range of the celestial sphere unable to be viewed from 35° ...
X. Nuclear star clusters in low-mass early-type galaxies
... et al. 2006; Kormendy et al. 2009). Although scaling relations of the luminosity and size of this nuclear excess light and NSCs with host galaxy properties may be continuous, the formation mechanisms are not necessarily the same. The other reason for discarding high-mass galaxies is that they often ...
... et al. 2006; Kormendy et al. 2009). Although scaling relations of the luminosity and size of this nuclear excess light and NSCs with host galaxy properties may be continuous, the formation mechanisms are not necessarily the same. The other reason for discarding high-mass galaxies is that they often ...
The chemical enrichment of the ICM from hydrodynamical simulations
... dynamical simulations, which include prescriptions for gas cooling, star formation and feedback, similar to those applied in SAMs, to address the specific role played by ram–pressure stripping to distribute metals, while Kapferer et al. (2007b) used the same approach to study the different roles pla ...
... dynamical simulations, which include prescriptions for gas cooling, star formation and feedback, similar to those applied in SAMs, to address the specific role played by ram–pressure stripping to distribute metals, while Kapferer et al. (2007b) used the same approach to study the different roles pla ...
Chapter 1 The Discovery of Open Clusters - Willmann-Bell
... Very faint nebulae Planetary nebulae Very large nebulae Very compressed, rich clusters of stars Compressed clusters of small and large stars Coarsely scattered clusters of stars. Although now long superseded, the Herschel designations which resulted from this classification system proved sufficientl ...
... Very faint nebulae Planetary nebulae Very large nebulae Very compressed, rich clusters of stars Compressed clusters of small and large stars Coarsely scattered clusters of stars. Although now long superseded, the Herschel designations which resulted from this classification system proved sufficientl ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.