Multiwavelength Observations of Massive Stellar Cluster Candidates
... Galaxy. The radio observations in this study have higher sensitivity and resolution than the VLANVSS data, and provide greater insight into the properties of the gas and dust surrounding these clusters. The primary goal of the radio data is to determine the properties of the ISM surrounding the cand ...
... Galaxy. The radio observations in this study have higher sensitivity and resolution than the VLANVSS data, and provide greater insight into the properties of the gas and dust surrounding these clusters. The primary goal of the radio data is to determine the properties of the ISM surrounding the cand ...
A numerical study of recent tidal interactions between dwarf galaxies
... has an influence on the evolution of the dwarf galaxies. In all studies tidal stripping and tidal tails were observed. These interactions also led to star formation bursts in the dwarf galaxies. And there was stated by Mayer et al. (2001a) that dwarf galaxies in the Milky Way potential were transfor ...
... has an influence on the evolution of the dwarf galaxies. In all studies tidal stripping and tidal tails were observed. These interactions also led to star formation bursts in the dwarf galaxies. And there was stated by Mayer et al. (2001a) that dwarf galaxies in the Milky Way potential were transfor ...
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 ...
A New Assessment of Dark Matter in the Milky Way Galaxy
... matter located at a given galactocentric radius, the net gravitational force at that position is equal to the gravitational force due to the mass interior to that radius and acts as though this entire interior mass were concentrated at the center of the galaxy. This approximation is mathematically v ...
... matter located at a given galactocentric radius, the net gravitational force at that position is equal to the gravitational force due to the mass interior to that radius and acts as though this entire interior mass were concentrated at the center of the galaxy. This approximation is mathematically v ...
A Comet-Hunter`s Legacy -
... near-collision about six hundred million years in the past; and each time they pass by each other, they undergo episodes of star formation caused by their gravitational interaction. M81's bright spiral arms are the site of star formation, partially caused by density waves raised by the most recent p ...
... near-collision about six hundred million years in the past; and each time they pass by each other, they undergo episodes of star formation caused by their gravitational interaction. M81's bright spiral arms are the site of star formation, partially caused by density waves raised by the most recent p ...
GAIA A Stereoscopic Census of our Galaxy - Cosmos
... definitive distance standards out to the LMC/SMC rapid reaction alerts for supernovae and burst sources (~6,000) quasar detection, redshifts, microlensing structure (~500,000) ...
... definitive distance standards out to the LMC/SMC rapid reaction alerts for supernovae and burst sources (~6,000) quasar detection, redshifts, microlensing structure (~500,000) ...
chemical abundances for a-and f-type supergiant stars
... phase, and that they are moving in the red-blue loop region. HD 180028, on the contary, shows typical abundances of Population I, but its evolutionary status cannot be satisfactorily defined. Key Words: stars: abundances — stars: atmospheres — stars: evolution — supergiants 1. INTRODUCTION The proce ...
... phase, and that they are moving in the red-blue loop region. HD 180028, on the contary, shows typical abundances of Population I, but its evolutionary status cannot be satisfactorily defined. Key Words: stars: abundances — stars: atmospheres — stars: evolution — supergiants 1. INTRODUCTION The proce ...
OGLE 2008–BLG–290: an accurate measurement of the limb
... Thanks to the public availability of data from the different groups, real-time modelling efforts then showed that the light curve was deviating from a normal Paczyński curve (Paczyński 1986), exhibiting evidence of extended-source effects. The event peaked on that same night (June 15). Because such e ...
... Thanks to the public availability of data from the different groups, real-time modelling efforts then showed that the light curve was deviating from a normal Paczyński curve (Paczyński 1986), exhibiting evidence of extended-source effects. The event peaked on that same night (June 15). Because such e ...
grav1to11 (102 slides)
... • M31 (now at 500 kpc) separated from MW a Hubble time ago • Large Magellanic Cloud has circulated our Galaxy for about 5 times at 50 kpc – argue both neighbours move with a typical 100-200km/s velocity relative to us. ...
... • M31 (now at 500 kpc) separated from MW a Hubble time ago • Large Magellanic Cloud has circulated our Galaxy for about 5 times at 50 kpc – argue both neighbours move with a typical 100-200km/s velocity relative to us. ...
Evolution of galaxy morphology - Lecture 1 - NCRA-TIFR
... Half of all disk galaxies - Milky Way included - show a central bar which contains up to 1/3 of the total light Bars are a form of dynamical instability in differentially rotating stellar disks S0 galaxies also have bars – a bar can persist in the absence of gas Bar patterns are not static, they rot ...
... Half of all disk galaxies - Milky Way included - show a central bar which contains up to 1/3 of the total light Bars are a form of dynamical instability in differentially rotating stellar disks S0 galaxies also have bars – a bar can persist in the absence of gas Bar patterns are not static, they rot ...
KINEMATIC MEASUREMENTS OF GAS AND STARS IN SPIRAL
... Complementary rotational kinematic information can be obtained using neutral gas, in either atomic (H I) or molecular (H 2 ) form. The first rotation curve for an external galaxy using H I was obtained by [5], again for M31, and even in this pioneering measurement they showed that the curve in H I c ...
... Complementary rotational kinematic information can be obtained using neutral gas, in either atomic (H I) or molecular (H 2 ) form. The first rotation curve for an external galaxy using H I was obtained by [5], again for M31, and even in this pioneering measurement they showed that the curve in H I c ...
On the Spiral Structure of the Milky Way Galaxy
... respect to rotation about the galactic center, known as a grand design (GD) spiral, is related to quasistationary spiral-density waves due to deviations of the galaxy’s gravitational potential axial symmetry, possibly due to the presence of a bar [1] or satellites; the best-studied examples are the ...
... respect to rotation about the galactic center, known as a grand design (GD) spiral, is related to quasistationary spiral-density waves due to deviations of the galaxy’s gravitational potential axial symmetry, possibly due to the presence of a bar [1] or satellites; the best-studied examples are the ...
2012 NSS Phy 2-(E).
... Weightlessness only occurs for objects inside a spacecraft orbiting around the Earth. B. The gravitational attraction of the Earth in the spacecraft’s orbit is so weak that the gravitational force is practically zero. C. The gravitational attraction of the Earth is cancelled out by that of the Moon. ...
... Weightlessness only occurs for objects inside a spacecraft orbiting around the Earth. B. The gravitational attraction of the Earth in the spacecraft’s orbit is so weak that the gravitational force is practically zero. C. The gravitational attraction of the Earth is cancelled out by that of the Moon. ...
Mass-to-light ratio gradients in early-type galaxy haloes
... have, in the near future, a much better observational picture of the halo mass distributions in a large representative sample of early-type galaxies. To prepare for this observational onslaught, in this paper we want to provide a suite of predictions from the CDM theory for halo mass distributions. ...
... have, in the near future, a much better observational picture of the halo mass distributions in a large representative sample of early-type galaxies. To prepare for this observational onslaught, in this paper we want to provide a suite of predictions from the CDM theory for halo mass distributions. ...
Observational evidence for AGN feedback in early
... and assemble the last, contrary to what has been deduced from observations. For a critical example, these models struggle to match the observed chemical abundance ratios and their trends with galaxy mass (Thomas 1999; Nagashima et al. 2005). The reason for this failure in the early models is that SF ...
... and assemble the last, contrary to what has been deduced from observations. For a critical example, these models struggle to match the observed chemical abundance ratios and their trends with galaxy mass (Thomas 1999; Nagashima et al. 2005). The reason for this failure in the early models is that SF ...
Searching for Planets During Predicted Mesolensing Events: II
... probability of an event occurring is very low. In addition, detection can be made challenging through the “dazzling by the light of the much nearer star”, the lens. Einstein’s doubts have not deterred astronomers, with their familiarity of the universe of possible lenses and background sources, from ...
... probability of an event occurring is very low. In addition, detection can be made challenging through the “dazzling by the light of the much nearer star”, the lens. Einstein’s doubts have not deterred astronomers, with their familiarity of the universe of possible lenses and background sources, from ...
Lennard-Jones quark matter and massive quark stars
... state in these two kinds of models are different, and we find that the Lennard-Jones model has stiffer equations of state, which lead to higher maximum masses for quark stars. Certainly, quark stars can have a very low mass (<10−3 M ) due to self colour interaction. On the other hand, we find that ...
... state in these two kinds of models are different, and we find that the Lennard-Jones model has stiffer equations of state, which lead to higher maximum masses for quark stars. Certainly, quark stars can have a very low mass (<10−3 M ) due to self colour interaction. On the other hand, we find that ...
Gas lines from the 5-Myr old optically thin disk around HD141569A
... to disagreements between the different gas tracers. If the disk was originally massive, the gas and the dust would have dissipated at the same rate. Key words. stars: pre-main-sequence, astrochemistry, protoplanetary disk ...
... to disagreements between the different gas tracers. If the disk was originally massive, the gas and the dust would have dissipated at the same rate. Key words. stars: pre-main-sequence, astrochemistry, protoplanetary disk ...
Silicon isotopic abundance toward evolved stars and its application
... Observations of the SiO isotopologue lines toward VY CMa, o Ceti, W Hya, and R Leo were carried out with the 12-m APEX telescope in 2011 September and 2012 December on Llano de Chajnantor in Chile. The single-sideband heterodyne receivers APEX-1 and APEX-2 (Vassilev et al. 2008; Risacher et al. 2006 ...
... Observations of the SiO isotopologue lines toward VY CMa, o Ceti, W Hya, and R Leo were carried out with the 12-m APEX telescope in 2011 September and 2012 December on Llano de Chajnantor in Chile. The single-sideband heterodyne receivers APEX-1 and APEX-2 (Vassilev et al. 2008; Risacher et al. 2006 ...
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.