Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... Homogeneous abundances of light elements, α-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 re ...
... Homogeneous abundances of light elements, α-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 re ...
A Collimated Jet and an Infalling-Rotating Disk in G192.16−3.84
... H2 O maser spatio–kinematical parameters, we discuss the formation mechanism of the massive young stellar objects and the outflow development in G192.16−3.84. Key words: ISM: jets and outflows — masers — stars: formation — stars: individual (G192.16−3.84) — stars: mass accretion 1. Introduction The ...
... H2 O maser spatio–kinematical parameters, we discuss the formation mechanism of the massive young stellar objects and the outflow development in G192.16−3.84. Key words: ISM: jets and outflows — masers — stars: formation — stars: individual (G192.16−3.84) — stars: mass accretion 1. Introduction The ...
Observations of Jets and Outflows from Young Stars
... into a jet, with a velocity several times the escape-speed from the launch region, which can range from 100 to over 500 km s−1 . Internal shocks form where faster ejecta overrun slower material. The very fastest shocks can sometimes be detected in X-rays. These primary flows often contain molecules ...
... into a jet, with a velocity several times the escape-speed from the launch region, which can range from 100 to over 500 km s−1 . Internal shocks form where faster ejecta overrun slower material. The very fastest shocks can sometimes be detected in X-rays. These primary flows often contain molecules ...
Uncovering the nucleus candidate for NGC 253
... neighboring galaxies, as revealed by new observations, contain starbursts and active galactic nuclei (AGNs) in close proximity (see Levenson et al. 2001 and references therein). It remains unclear whether or not proximity implies a physical connection, but a mechanism for forming a supermassive blac ...
... neighboring galaxies, as revealed by new observations, contain starbursts and active galactic nuclei (AGNs) in close proximity (see Levenson et al. 2001 and references therein). It remains unclear whether or not proximity implies a physical connection, but a mechanism for forming a supermassive blac ...
from z=0 to z=1
... 5. The z~0 counterparts of LBGs are a population of compact luminous UV galaxies (UVLG). In terms of Ltot (SFR), UVLGs are more than 10 times fainter than ULIRGs. 6. LBGs and SCUBA galaxies (UV and IR selected galaxies at z~3) do not overlap with each other very much. SCUBA galaxies have significant ...
... 5. The z~0 counterparts of LBGs are a population of compact luminous UV galaxies (UVLG). In terms of Ltot (SFR), UVLGs are more than 10 times fainter than ULIRGs. 6. LBGs and SCUBA galaxies (UV and IR selected galaxies at z~3) do not overlap with each other very much. SCUBA galaxies have significant ...
The Oort cloud as a remnant of the protosolar nebula
... The origin of the Oort cloud comets still remains an unanswered question, because all recent theories had serious shortcomings. The most popular primordial theory at present, which assumes the creation of comets in the Uranus-Neptune region during planet formation, does not provide a sufficient sour ...
... The origin of the Oort cloud comets still remains an unanswered question, because all recent theories had serious shortcomings. The most popular primordial theory at present, which assumes the creation of comets in the Uranus-Neptune region during planet formation, does not provide a sufficient sour ...
Migrating Dust Particles
... size they drifted towards the Sun. This material was later accreted to planetesimals which are held together by self-gravity. As the planetesimals extend their gravitational range they have a run-away growth towards becoming planets. In this step the planetesimals grow more the larger they get. This ...
... size they drifted towards the Sun. This material was later accreted to planetesimals which are held together by self-gravity. As the planetesimals extend their gravitational range they have a run-away growth towards becoming planets. In this step the planetesimals grow more the larger they get. This ...
ALMA How does it work and how to use it
... Spatial resolution per frequency This depends on the baseline, for this case 1km baseline was used for bands 3-7 and 1.5km for 8 & 9. For Cycle 3 longer baselines will be offered, up to 15km (resolution is roughly an order of magnitude better) ...
... Spatial resolution per frequency This depends on the baseline, for this case 1km baseline was used for bands 3-7 and 1.5km for 8 & 9. For Cycle 3 longer baselines will be offered, up to 15km (resolution is roughly an order of magnitude better) ...
observations of white dwarfs in the solar neighborhood
... models. Pure helium models do not describe well the observed spectroscopic properties of NLTT 40607, especially in the optical range, which shows heavy-element line blanketing, and the higher temperature estimate should be adopted. Note that as in G165-7, NLTT 40607 shows an asymmetric Mg i k5170 pr ...
... models. Pure helium models do not describe well the observed spectroscopic properties of NLTT 40607, especially in the optical range, which shows heavy-element line blanketing, and the higher temperature estimate should be adopted. Note that as in G165-7, NLTT 40607 shows an asymmetric Mg i k5170 pr ...
Galaxies - hwchemistry
... of galaxies, however, they find that the measured masses are much larger than expected from the luminosities of the galaxies. • This seems to be true of most galaxies. – Measured masses of galaxies amount to 10 to 100 times more mass than you would expect from the appearance of galaxies. ...
... of galaxies, however, they find that the measured masses are much larger than expected from the luminosities of the galaxies. • This seems to be true of most galaxies. – Measured masses of galaxies amount to 10 to 100 times more mass than you would expect from the appearance of galaxies. ...
The Celestial Origin of Atoms
... as applied to our own Sun, and by extrapolation, to all stars. (The discrepancy is roughly a factor of two, and this can very likely be put down to problems in our understanding of neutrinos, rather than some defect in stellar physics.) More precisely, it corroborates our ideas about hydrogen fusion ...
... as applied to our own Sun, and by extrapolation, to all stars. (The discrepancy is roughly a factor of two, and this can very likely be put down to problems in our understanding of neutrinos, rather than some defect in stellar physics.) More precisely, it corroborates our ideas about hydrogen fusion ...
Star Clusters - Caltech Astronomy
... to the difference in distance modulus between the two. There may also be additional shifts in magnitude and color index resulting from interstellar absorption. The general procedure is to apply the effects of absorption, if known, and then slide the diagrams of the two clusters until they match, acc ...
... to the difference in distance modulus between the two. There may also be additional shifts in magnitude and color index resulting from interstellar absorption. The general procedure is to apply the effects of absorption, if known, and then slide the diagrams of the two clusters until they match, acc ...
The chemical history of molecules in circumstellar disks I: Ices
... Context. Many chemical changes occur during the collapse of a molecular cloud core to form a low-mass star and the surrounding disk. One-dimensional models have been used so far to analyse these chemical processes, but they cannot properly describe the incorporation of material into disks. Aims. The ...
... Context. Many chemical changes occur during the collapse of a molecular cloud core to form a low-mass star and the surrounding disk. One-dimensional models have been used so far to analyse these chemical processes, but they cannot properly describe the incorporation of material into disks. Aims. The ...
arXiv:1601.01542v1 [astro-ph.GA] 7 Jan 2016
... Roy & Walsh 1997, among others). These features have been theoretically suggested to be motivated, for instance, by the presence of radial migration (Minchev et al. 2011, 2012). Nevertheless, their origin is still unknown. All these spectroscopic studies were limited by statistics, either in the num ...
... Roy & Walsh 1997, among others). These features have been theoretically suggested to be motivated, for instance, by the presence of radial migration (Minchev et al. 2011, 2012). Nevertheless, their origin is still unknown. All these spectroscopic studies were limited by statistics, either in the num ...
ESA BR-170 - ESA Science
... In 1800, the German-born British astronomer and musician, William Herschel – famous for his discovery of the planet Uranus a few years earlier – described that the differently coloured filters through which he observed the Sun allowed different levels of heat to pass. He performed a simple experimen ...
... In 1800, the German-born British astronomer and musician, William Herschel – famous for his discovery of the planet Uranus a few years earlier – described that the differently coloured filters through which he observed the Sun allowed different levels of heat to pass. He performed a simple experimen ...
Lecture 2
... Completing the z~3 Picture • Using molecular line emission at z=3, could probe cool gas • “low-excitation lines will map out a larger fraction of the ISM in these galaxies and…study in detail the spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & B ...
... Completing the z~3 Picture • Using molecular line emission at z=3, could probe cool gas • “low-excitation lines will map out a larger fraction of the ISM in these galaxies and…study in detail the spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & B ...
The Life and Work of Edward Emerson Barnard
... 'not been well' for some time, as he told Wesley,71 had not refrained from his usual demanding observing schedule, but now he became seriously ill just as these phenomena were passing through another critical phase - the Earth was due to make its final passage through the ring-plane on January 7,190 ...
... 'not been well' for some time, as he told Wesley,71 had not refrained from his usual demanding observing schedule, but now he became seriously ill just as these phenomena were passing through another critical phase - the Earth was due to make its final passage through the ring-plane on January 7,190 ...
The Physical Origins of The Morphology
... increased fraction of elliptical galaxies in dense environments (Dressler 1980) also challenges the idea that gas stripping explains the MDR. This concern, as well as the different properties of spirals and S0s, could be accommodated by a invoking a process that affects both the structure and gas co ...
... increased fraction of elliptical galaxies in dense environments (Dressler 1980) also challenges the idea that gas stripping explains the MDR. This concern, as well as the different properties of spirals and S0s, could be accommodated by a invoking a process that affects both the structure and gas co ...
the structure of the local interstellar medium. v. electron densities
... 132 pc away. The excited absorption along other LISM sight lines has been measured at moderate resolution (R 20;000) with Copernicus (e.g., York & Kinahan 1979) and the Far Ultraviolet Spectroscopic Explorer (FUSE; Lehner et al. 2003), although typically individual absorbers are not resolved, so ...
... 132 pc away. The excited absorption along other LISM sight lines has been measured at moderate resolution (R 20;000) with Copernicus (e.g., York & Kinahan 1979) and the Far Ultraviolet Spectroscopic Explorer (FUSE; Lehner et al. 2003), although typically individual absorbers are not resolved, so ...
GammaRay Bursts, the Strongest Explosions in the Universe.
... GRBs could be extra galactic, making them much more powerful than if they were produced by relativity “local” Galactic objects. Note that a source at distant galaxy is million times further than a source in our own Galaxy. This would make an extragalactic bursts 1012 ...
... GRBs could be extra galactic, making them much more powerful than if they were produced by relativity “local” Galactic objects. Note that a source at distant galaxy is million times further than a source in our own Galaxy. This would make an extragalactic bursts 1012 ...
EROs and submm galaxies: Expectations for FMOS in the
... Single-night FMOS observations should be sensitive enough to measure redshifts and accurate line fluxes study the stellar continuum ...
... Single-night FMOS observations should be sensitive enough to measure redshifts and accurate line fluxes study the stellar continuum ...
The Circumstellar Environments of Young Stars at AU Scales
... A note on nomenclature: Before the innermost disk regions could be spatially resolved, as described in this review, disk models were tailored to fit primarily the unresolved spectrophotometry. The models used can be generally characterized as being geometrically thin and optically thick, with simple ...
... A note on nomenclature: Before the innermost disk regions could be spatially resolved, as described in this review, disk models were tailored to fit primarily the unresolved spectrophotometry. The models used can be generally characterized as being geometrically thin and optically thick, with simple ...
Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
... dwarfs.’’ BCDs include gas, stars, and usually starburst regions, all of which are centrally concentrated. Due to their pronounced compact starbursts, BCDs have higher surface brightnesses (B 22 mag arcsec2). Like dIs, BCDs are also metal-poor, with Z as low as 1/50 Z, showing a trend of redder ...
... dwarfs.’’ BCDs include gas, stars, and usually starburst regions, all of which are centrally concentrated. Due to their pronounced compact starbursts, BCDs have higher surface brightnesses (B 22 mag arcsec2). Like dIs, BCDs are also metal-poor, with Z as low as 1/50 Z, showing a trend of redder ...
The KMOS Redshift One Spectroscopic Survey
... at progressively high redshifts, in that galaxies with the same rotation velocity in the distant Universe have lower stellar masses (e.g. Swinbank et al. 2006). This suggests either higher gas fractions as measured directly by Tacconi et al. (2010) or increased dark matter fractions or perhaps even ...
... at progressively high redshifts, in that galaxies with the same rotation velocity in the distant Universe have lower stellar masses (e.g. Swinbank et al. 2006). This suggests either higher gas fractions as measured directly by Tacconi et al. (2010) or increased dark matter fractions or perhaps even ...