Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
... A sample of 34 dwarf irregular galaxies (dIs) in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and Ks at the Canada-France-Hawaii Telescope (CFHT) in Hawaii and the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, in Mexico. Absolute mag ...
... A sample of 34 dwarf irregular galaxies (dIs) in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and Ks at the Canada-France-Hawaii Telescope (CFHT) in Hawaii and the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, in Mexico. Absolute mag ...
The Interstellar Medium White Paper
... gas has itself formed. But how do molecular clouds form in the first place? This fundamental process has yet to be observed. It is the rate-determining step for star formation itself. Observations of external spiral galaxies show that massive stars and their giant molecular clouds (GMCs) tend to for ...
... gas has itself formed. But how do molecular clouds form in the first place? This fundamental process has yet to be observed. It is the rate-determining step for star formation itself. Observations of external spiral galaxies show that massive stars and their giant molecular clouds (GMCs) tend to for ...
Article PDF - IOPscience
... objects (CSOs) taken with the Infrared Spectrograph on the Spitzer Space Telescope. The hosts of these young, powerful radio galaxies show significant diversity in their mid-IR spectra. This includes multiple atomic fine-structure lines, H2 gas, polycyclic aromatic hydrocarbon (PAH) emission, warm d ...
... objects (CSOs) taken with the Infrared Spectrograph on the Spitzer Space Telescope. The hosts of these young, powerful radio galaxies show significant diversity in their mid-IR spectra. This includes multiple atomic fine-structure lines, H2 gas, polycyclic aromatic hydrocarbon (PAH) emission, warm d ...
Galactic Archaeology: Current Surveys
... 10 km/s. The values of the stellar atmospheric parameters are obtained through a dedicated pipeline (Lee et al. 2008), developed for the broad range of targets and giving metallicity estimates to ∼ 0.2 dex, and for high signal-to-noise spectra, an estimate of the relative abundance of the ‘alpha-ele ...
... 10 km/s. The values of the stellar atmospheric parameters are obtained through a dedicated pipeline (Lee et al. 2008), developed for the broad range of targets and giving metallicity estimates to ∼ 0.2 dex, and for high signal-to-noise spectra, an estimate of the relative abundance of the ‘alpha-ele ...
The Electric Universe by Wallace Thornhill and David Talbott
... confidently of the Big Bang that set the clock ticking and the universe on its course 13.7 billion years ago. This is a universe filled with black holes, dark matter, dark energy, and other incomprehensible objects and forces, all with one thing in common: they remain unseen and inaccessible under k ...
... confidently of the Big Bang that set the clock ticking and the universe on its course 13.7 billion years ago. This is a universe filled with black holes, dark matter, dark energy, and other incomprehensible objects and forces, all with one thing in common: they remain unseen and inaccessible under k ...
Video Lesson Information Astronomy: Observations & Theories Astronomy 1
... Lesson 1 - The Study of the Universe This lesson takes students on a journey from planet Earth to the distant galaxies and superclusters. It is illustrated with stunning computer animation and photographs from NASA, the Jet Propulsion Laboratory (JPL), and astronomical observatories. This journey in ...
... Lesson 1 - The Study of the Universe This lesson takes students on a journey from planet Earth to the distant galaxies and superclusters. It is illustrated with stunning computer animation and photographs from NASA, the Jet Propulsion Laboratory (JPL), and astronomical observatories. This journey in ...
CENTRAL TEXAS COLLEGE
... provide a sense of the mystery and majesty of the universe. As with our ancestors back beyond recorded time, we can’t help but wonder what kind of Universe is this? What are its fundamental laws? How old is it? How big? What does it contain? How has it changed with time, and what may be its future? ...
... provide a sense of the mystery and majesty of the universe. As with our ancestors back beyond recorded time, we can’t help but wonder what kind of Universe is this? What are its fundamental laws? How old is it? How big? What does it contain? How has it changed with time, and what may be its future? ...
Physics of Star Formation: Milky Way and Beyond
... Galactic outflows are poorly understood although they are essential to feedback processes that quench star formation and limit the total mass of large galaxies. Thus, insufficient understanding of feedback associated with them - in particular molecular phase - is one of the greatest shortcomings in ...
... Galactic outflows are poorly understood although they are essential to feedback processes that quench star formation and limit the total mass of large galaxies. Thus, insufficient understanding of feedback associated with them - in particular molecular phase - is one of the greatest shortcomings in ...
Goal: To understand clusters of stars
... old. • And the cluster is moving by us at 46 km/s. • 46 km/s = 1 light year per 6000 years ...
... old. • And the cluster is moving by us at 46 km/s. • 46 km/s = 1 light year per 6000 years ...
Goal: To understand clusters of stars
... old. • And the cluster is moving by us at 46 km/s. • 46 km/s = 1 light year per 6000 years ...
... old. • And the cluster is moving by us at 46 km/s. • 46 km/s = 1 light year per 6000 years ...
Collisions and Encounters of Stellar Systems
... ∼ L! ) is n ≈ φ! ≈ 10 Mpc . Most of the stars in a typical luminous galaxy are contained within a radius R ≈ 10 kpc, so the collision cross-section between two such galaxies is Σ ≈ π(2R)2 . If the positions and velocities of the galaxies are uncorrelated, the rate at which an L! galaxy suffers colli ...
... ∼ L! ) is n ≈ φ! ≈ 10 Mpc . Most of the stars in a typical luminous galaxy are contained within a radius R ≈ 10 kpc, so the collision cross-section between two such galaxies is Σ ≈ π(2R)2 . If the positions and velocities of the galaxies are uncorrelated, the rate at which an L! galaxy suffers colli ...
A Modern View of the Universe
... shrunk down to a scale that would allow you to walk through it. The Voyage scale model solar system in Washington, D.C., makes such a walk possible (Figure 1.4). The Voyage model shows the Sun and the planets, and the distances between them, at one ten-billionth of their actual sizes and distances. ...
... shrunk down to a scale that would allow you to walk through it. The Voyage scale model solar system in Washington, D.C., makes such a walk possible (Figure 1.4). The Voyage model shows the Sun and the planets, and the distances between them, at one ten-billionth of their actual sizes and distances. ...
Summary of Talks at Growing Black Holes 2004 in Garching
... They have GTO time for 120 ULIRGs, with z out to 1. So far, data for 20 objects with a range of properties, from hot dust to cool dust with many spectral features. Also a range of strengths and widths of the CO feature in ULIRGs. U5101 shows Si absorption, PAH emission, and AGN features [NeV], too, ...
... They have GTO time for 120 ULIRGs, with z out to 1. So far, data for 20 objects with a range of properties, from hot dust to cool dust with many spectral features. Also a range of strengths and widths of the CO feature in ULIRGs. U5101 shows Si absorption, PAH emission, and AGN features [NeV], too, ...
Simulations of the galaxy population constrained by observations
... 1999; Helly et al. 2003; Hatton et al. 2003). With increasing numerical resolution it becomes possible to base the trees not on the haloes themselves but rather on the individual gravitationally self-bound subhaloes from which they are built (Springel et al. 2001, 2005; Kang et al. 2005; De Lucia et ...
... 1999; Helly et al. 2003; Hatton et al. 2003). With increasing numerical resolution it becomes possible to base the trees not on the haloes themselves but rather on the individual gravitationally self-bound subhaloes from which they are built (Springel et al. 2001, 2005; Kang et al. 2005; De Lucia et ...
Stellar Populations of Galaxies- 2 Lectures H
... with Hubble a few nearby galaxies) can one construct a H-R diagram which shows this For distant galaxies we have to deal with integrated spectra colors and brightness and the effects of dust. ...
... with Hubble a few nearby galaxies) can one construct a H-R diagram which shows this For distant galaxies we have to deal with integrated spectra colors and brightness and the effects of dust. ...
MESSIER - EarthLink
... August: William Herschel begins his deep-sky survey, stimulated by Messier's catalog. On September 7, he originally discovers his first deepsky object: The Saturn Nebula (NGC 7009). ...
... August: William Herschel begins his deep-sky survey, stimulated by Messier's catalog. On September 7, he originally discovers his first deepsky object: The Saturn Nebula (NGC 7009). ...
The ATLAS3D project-XXII. Low-efficiency star formation in early
... simulations of gas discs embedded in isolated early-type and spiral galaxies. Despite using a universal local law to form stars in the simulations, we find that the earlytype galaxies are offset from the spirals on the large-scale Kennicutt relation, and form stars two to five times less efficiently ...
... simulations of gas discs embedded in isolated early-type and spiral galaxies. Despite using a universal local law to form stars in the simulations, we find that the earlytype galaxies are offset from the spirals on the large-scale Kennicutt relation, and form stars two to five times less efficiently ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... galaxies at intermediate redshift (Msec). In Section 2 we describe the data and illustrate our ability to detect X-ray emission from the AGES galaxies through the stacking approach. In Section 3 we provide further details of our stacking analysis and use Monte Carlo simulations to test it and to ref ...
... galaxies at intermediate redshift (Msec). In Section 2 we describe the data and illustrate our ability to detect X-ray emission from the AGES galaxies through the stacking approach. In Section 3 we provide further details of our stacking analysis and use Monte Carlo simulations to test it and to ref ...
Andromeda Nebula Lies Outside Milky Way Galaxy
... On December 30, 1924, Hubble announced that he had taken photographs of a few bright spiral nebulae with the Mount Wilson Hooker telescope, the largest reflecting telescope in the world. According to Dr. Hubble, "The 100 inch reflector partially resolved a few of the nearest, neighboring [spiral] ne ...
... On December 30, 1924, Hubble announced that he had taken photographs of a few bright spiral nebulae with the Mount Wilson Hooker telescope, the largest reflecting telescope in the world. According to Dr. Hubble, "The 100 inch reflector partially resolved a few of the nearest, neighboring [spiral] ne ...
Preliminary Talk Abstract Book - MoCA
... Fossati, The role of environment on the growth of galaxies at z~1-2.5 from the KMOS-3D survey Wilman, An inside-out growth and outside-in truncation of star forming disks? Testing the role of star formation driven size growth with resolved Halpha maps from KMOS-3D and HAGGIS at z~0 ...
... Fossati, The role of environment on the growth of galaxies at z~1-2.5 from the KMOS-3D survey Wilman, An inside-out growth and outside-in truncation of star forming disks? Testing the role of star formation driven size growth with resolved Halpha maps from KMOS-3D and HAGGIS at z~0 ...
Spiral Arms - Harry Kroto
... Spiral Arms In the disk the density of stars in the spiral arms in only about 5% greater than the density of stars in the rest of the disk. So why are they so much brighter? Newborn clusters are all in the spiral arms. These clusters contain the most luminous and blue stars. So even though the dens ...
... Spiral Arms In the disk the density of stars in the spiral arms in only about 5% greater than the density of stars in the rest of the disk. So why are they so much brighter? Newborn clusters are all in the spiral arms. These clusters contain the most luminous and blue stars. So even though the dens ...
Low-Res Version - Chandra X
... part of the electromagnetic spectrum. X-rays, and other wavelengths such as radio, infra-red, ultra-violet and gamma, cannot be seen with the human eye, and thus do not have any "color". To see the invisible wavelengths, we need detectors that are especially designed to see those other wavelengths, ...
... part of the electromagnetic spectrum. X-rays, and other wavelengths such as radio, infra-red, ultra-violet and gamma, cannot be seen with the human eye, and thus do not have any "color". To see the invisible wavelengths, we need detectors that are especially designed to see those other wavelengths, ...
Gilmore - Astrometry and Astrophysics in the Gaia sky
... distances to 1% for 18 million stars to 2.5 kpc distances to 10% for 150 million stars to 25 kpc rare stellar types and rapid evolutionary phases in large numbers parallax calibration of all distance indicators e.g. Cepheids and RR Lyrae to LMC/SMC ...
... distances to 1% for 18 million stars to 2.5 kpc distances to 10% for 150 million stars to 25 kpc rare stellar types and rapid evolutionary phases in large numbers parallax calibration of all distance indicators e.g. Cepheids and RR Lyrae to LMC/SMC ...
Edwin Hubble (1889
... before the National Academy of Sciences on 26 April 1920. His major concern was the size of the galaxy. His model of a drastically larger galaxy, with the solar system far from its center, was largely correct. But he was on less solid ground when he argued that the spiral nebulae, which seemed to be ...
... before the National Academy of Sciences on 26 April 1920. His major concern was the size of the galaxy. His model of a drastically larger galaxy, with the solar system far from its center, was largely correct. But he was on less solid ground when he argued that the spiral nebulae, which seemed to be ...
Jason T. Wright Roger Griffith, Steinn Sigurðsson Matthew Povich
... waste heat in the mid-infrared A civilization using most of its star’s energy would have little optical luminosity but be a very bright infrared source. This approach is totally general: any energy use by a civilization would give a star a mid-infrared excess ...
... waste heat in the mid-infrared A civilization using most of its star’s energy would have little optical luminosity but be a very bright infrared source. This approach is totally general: any energy use by a civilization would give a star a mid-infrared excess ...
Galaxy Zoo
Galaxy Zoo is a crowdsourced astronomy project which invites people to assist in the morphological classification of large numbers of galaxies. (e.g.) It is an example of citizen science as it enlists the help of members of the public to help in scientific research. There have been seven versions up to July 2014, which are outlined in this article. Galaxy Zoo is part of the Zooniverse, a group of citizen science projects.