Proto-planetary disks
... meaning transition from disky to diskless is fast (~0.1Myr) compared with disk lifetime (~10Myr) (Hartmann et al. 2005; Silverstone et al. 2006) • Transition objects are seen at higher rate in old clusters (Megeath et al. 2006) • Very few CTTS are diskless, while most WTTS are diskless (Padgett et ...
... meaning transition from disky to diskless is fast (~0.1Myr) compared with disk lifetime (~10Myr) (Hartmann et al. 2005; Silverstone et al. 2006) • Transition objects are seen at higher rate in old clusters (Megeath et al. 2006) • Very few CTTS are diskless, while most WTTS are diskless (Padgett et ...
Giant molecular clouds in the dwarf galaxy NGC 1569
... However, Maloney (1990) has argued that this MV T –LCO correlation is simply a result of the observed size-linewidth relation and would exist whether or not the GMCs were in virial equilibrium. In the end, the fact that conversion factors derived with this method generally agree with those derived f ...
... However, Maloney (1990) has argued that this MV T –LCO correlation is simply a result of the observed size-linewidth relation and would exist whether or not the GMCs were in virial equilibrium. In the end, the fact that conversion factors derived with this method generally agree with those derived f ...
Lecture 15a - Sierra College Astronomy Home Page
... The problem with all these hypotheses (of aliens watching us quietly) is that galactic shear would move us to new stellar systems in a few million years; enforcement of a “DO-NOT-CONTACT-EARTHLINGS” rule would require cooperation at a galactic scale. In other words, if you think we are being quietly ...
... The problem with all these hypotheses (of aliens watching us quietly) is that galactic shear would move us to new stellar systems in a few million years; enforcement of a “DO-NOT-CONTACT-EARTHLINGS” rule would require cooperation at a galactic scale. In other words, if you think we are being quietly ...
Institute for Astrophysical Research Seminar Series
... Steven Snowden (NASA Goddard Space Flight Center) The Diffuse X-ray Background, from Earth's Exosphere to the Edge of the Universe OR One Astronomer's Signal is Another Astronomer's Contamination ...
... Steven Snowden (NASA Goddard Space Flight Center) The Diffuse X-ray Background, from Earth's Exosphere to the Edge of the Universe OR One Astronomer's Signal is Another Astronomer's Contamination ...
has occurred over the past 14 billion years COSMIC DOWNSIZING
... technique to isolate hundreds of ancient star-forming galaxies with redshifts of about three, dating from about two billion years after the big bang. The researchers confi rmed many of the estimated redshifts by obtaining very deep spectra of the galaxies with the powerful 10-meter Keck telescope on ...
... technique to isolate hundreds of ancient star-forming galaxies with redshifts of about three, dating from about two billion years after the big bang. The researchers confi rmed many of the estimated redshifts by obtaining very deep spectra of the galaxies with the powerful 10-meter Keck telescope on ...
10. The Lives of the Stars
... Like photons, electrons are both particles and waves. The wavelength of an electron is ...
... Like photons, electrons are both particles and waves. The wavelength of an electron is ...
Dynamics of galaxies and clusters in refracted gravity
... in standard gravity, the velocity dispersion of galaxies in clusters, the temperature of the intracluster gas, and gravitational lensing effects, all suggest that the gravitating mass of clusters is five to ten times larger than the mass that emits the electromagnetic radiation. The most widely acce ...
... in standard gravity, the velocity dispersion of galaxies in clusters, the temperature of the intracluster gas, and gravitational lensing effects, all suggest that the gravitating mass of clusters is five to ten times larger than the mass that emits the electromagnetic radiation. The most widely acce ...
Cepheid Calibration
... Sometimes a great advance in science is achieved through selfless work performed by a modest person not striving for recognition on the stage of history. Such was the contribution of Henrietta Leavitt, one of many female “computers” working at the Harvard College Observatory for small hourly wages. ...
... Sometimes a great advance in science is achieved through selfless work performed by a modest person not striving for recognition on the stage of history. Such was the contribution of Henrietta Leavitt, one of many female “computers” working at the Harvard College Observatory for small hourly wages. ...
An analysis of the HI component of the Magellanic Bridge
... detected in emission for the first time in the Magellanic Bridge – Indication of star formation from molecular cloud collapse (c/w shock triggered star formation) – Star formation within tidal structure and a very low metallicity environment • This presents a unique and opportunity to study star-for ...
... detected in emission for the first time in the Magellanic Bridge – Indication of star formation from molecular cloud collapse (c/w shock triggered star formation) – Star formation within tidal structure and a very low metallicity environment • This presents a unique and opportunity to study star-for ...
A Hero`s Little Horse: Discovery of a Dissolving Star Cluster in
... centre of mass calculated in terms of the normalised signals on the array into which the stars were binned and smoothed as described in Section 2. We derive an ellipticity = 0.42 ± 0.10 and a position angle θ = −59 ± 6 deg by using the fit bivariate normal function of the astroML package (VanderPl ...
... centre of mass calculated in terms of the normalised signals on the array into which the stars were binned and smoothed as described in Section 2. We derive an ellipticity = 0.42 ± 0.10 and a position angle θ = −59 ± 6 deg by using the fit bivariate normal function of the astroML package (VanderPl ...
- University of Manitoba
... In order to create a Starburst Galaxy, there must be present a large supply of gas to form large amounts of new stars. This large amount of gas must undergo compression through tidal forces triggered by a close encounter or collision with another nearby galaxy M82’s high level of star formation is d ...
... In order to create a Starburst Galaxy, there must be present a large supply of gas to form large amounts of new stars. This large amount of gas must undergo compression through tidal forces triggered by a close encounter or collision with another nearby galaxy M82’s high level of star formation is d ...
Titelseite
... • Gamma spectroscopy has many advantages compared with optical measurements, especially when detecting super nova related data: the decays are not affected by the heat- or mass density, and while optical methods are affected by the shell structure of supernovae (several months can pass until the cor ...
... • Gamma spectroscopy has many advantages compared with optical measurements, especially when detecting super nova related data: the decays are not affected by the heat- or mass density, and while optical methods are affected by the shell structure of supernovae (several months can pass until the cor ...
PDF format
... e) False, you would have an equal chance of finding an elliptical galaxy in any environment in the universe. © 2014 Pearson Education, Inc. ...
... e) False, you would have an equal chance of finding an elliptical galaxy in any environment in the universe. © 2014 Pearson Education, Inc. ...
- IRSF: Past and Future
... order to reveal its magnetic field structure. We used the imaging polarimeter SIRPOL mounted on the IRSF 1.4 m telescope at the South African Astronomical Observatory. The polarization vector maps obtained show the magnetic fields of the Vela C as follows: (1) In the Centre-Ridge subregion, which co ...
... order to reveal its magnetic field structure. We used the imaging polarimeter SIRPOL mounted on the IRSF 1.4 m telescope at the South African Astronomical Observatory. The polarization vector maps obtained show the magnetic fields of the Vela C as follows: (1) In the Centre-Ridge subregion, which co ...
Document
... then several of these clouds are needed to account for the velocities measured around the sun. ...
... then several of these clouds are needed to account for the velocities measured around the sun. ...
Discovery of Warm and Dense Molecular Gas Surrounding the Ring
... emission — which increases toward the southeast —with the molecular cloud around DR 15. Furthermore, in the wide-field MSX (Midcourse Space Experiment) and SCUBA (Submillimeter Common-User Bolometric Array) images of Redman et al. (2003) we can clearly associate the CO emission to the higher column ...
... emission — which increases toward the southeast —with the molecular cloud around DR 15. Furthermore, in the wide-field MSX (Midcourse Space Experiment) and SCUBA (Submillimeter Common-User Bolometric Array) images of Redman et al. (2003) we can clearly associate the CO emission to the higher column ...
Online version of poster
... a pressure wave to propagate outward from the sink and heat particles at progressively larger radii and lower density. The heated region extends out to ∼ 2,000 AU at 5000 yr. We do not include any radiative feedback effects here. However, McKee & Tan (2008) estimate that the accretion rate of a disk ...
... a pressure wave to propagate outward from the sink and heat particles at progressively larger radii and lower density. The heated region extends out to ∼ 2,000 AU at 5000 yr. We do not include any radiative feedback effects here. However, McKee & Tan (2008) estimate that the accretion rate of a disk ...
Storm fronts over galaxy discs: Models of how
... E-mail: [email protected] (CS), [email protected] (DCS) ABSTRACT The existence of partially ionized, diffuse gas and dust clouds at kiloparsec scale distances above the central planes of edge-on, galaxy discs was an unexpected discovery about 20 yrs ago. Subsequent observations showed that this ...
... E-mail: [email protected] (CS), [email protected] (DCS) ABSTRACT The existence of partially ionized, diffuse gas and dust clouds at kiloparsec scale distances above the central planes of edge-on, galaxy discs was an unexpected discovery about 20 yrs ago. Subsequent observations showed that this ...
ppt
... disk into internal and external remnants. The mass of the interior and exterior disk depends on the age of the disk. The concept that giant planet migration would eliminate all the mass in its swept zone is not supported by the results. The inner part clears completly if the giant moves inside 0.05 ...
... disk into internal and external remnants. The mass of the interior and exterior disk depends on the age of the disk. The concept that giant planet migration would eliminate all the mass in its swept zone is not supported by the results. The inner part clears completly if the giant moves inside 0.05 ...
Molecular Outflows Driven by Young Brown Dwarfs And VLMs. New
... distributed on an ellipsis with lobes symmetrical with respect to the central source. This result is more complex although apparently consistent with the one of Phan-Bao (2011). The estimated mass in each of the blue / red lobes is ≈ 2 10−5 M⊙ . We model the MHO5 emission in the form of a cone orien ...
... distributed on an ellipsis with lobes symmetrical with respect to the central source. This result is more complex although apparently consistent with the one of Phan-Bao (2011). The estimated mass in each of the blue / red lobes is ≈ 2 10−5 M⊙ . We model the MHO5 emission in the form of a cone orien ...
SUMSS - 京都大学
... What are the “high SFR” galaxies? • Radio LF for star-forming galaxies implies that galaxies with SFR > 30 Msun/yr are far more common than Ha surveys suggest, and may account for up to 40% of the local star-formation density. • Dust obscuration in star-forming regions could lead to under-estimate ...
... What are the “high SFR” galaxies? • Radio LF for star-forming galaxies implies that galaxies with SFR > 30 Msun/yr are far more common than Ha surveys suggest, and may account for up to 40% of the local star-formation density. • Dust obscuration in star-forming regions could lead to under-estimate ...
Spatial distribution of stars in the Milky Way
... responsible for that pull, and determine whether all the light we observe from the disk is enough to account for its mass. Or whether there is evidence for some "missing mass". ...
... responsible for that pull, and determine whether all the light we observe from the disk is enough to account for its mass. Or whether there is evidence for some "missing mass". ...
DOPPLER SHIFT IN THE MILKY WAY
... which vehicles’ engine noise would have been most and least Doppler shifted? Why? (And can you now see why we were so concerned with resolving the velocity vectors into components along and across the line of sight?) ...
... which vehicles’ engine noise would have been most and least Doppler shifted? Why? (And can you now see why we were so concerned with resolving the velocity vectors into components along and across the line of sight?) ...