Herschel far-infrared observations of the Carina Nebula complex⋆
... Key words. stars: formation – circumstellar matter – stars: protostars – stars: luminosity function, mass function – ISM: individual objects: NGC 3372 – stars: individual: η Carinae ...
... Key words. stars: formation – circumstellar matter – stars: protostars – stars: luminosity function, mass function – ISM: individual objects: NGC 3372 – stars: individual: η Carinae ...
COMPACT GROUPS OF GALAXIES
... of the groups in any particular sample may be strongly influenced by the criteria used to define the sample. The early surveys used qualitative criteria that, while successful in finding many interesting individual objects, do not easily allow one to draw broad conclusions about the groups as a whol ...
... of the groups in any particular sample may be strongly influenced by the criteria used to define the sample. The early surveys used qualitative criteria that, while successful in finding many interesting individual objects, do not easily allow one to draw broad conclusions about the groups as a whol ...
Probing nuclear activity versus star formation at z ∼ 0.8 using near
... by modelling their multifrequency SEDs and did not find strong evidence for either highly suppressed or enhanced star formation when compared to a mass-matched sample of galaxies at the same redshift. However, these AGN were selected to have SEDs dominated by stellar emission, and thus, they are rep ...
... by modelling their multifrequency SEDs and did not find strong evidence for either highly suppressed or enhanced star formation when compared to a mass-matched sample of galaxies at the same redshift. However, these AGN were selected to have SEDs dominated by stellar emission, and thus, they are rep ...
Luminous Blue Variables are Antisocial: Their Isolation Implies that
... attempt to correct for distances along the line-of-sight to further cull the sample of O-type stars, because that may introduce a bias. For example, in many cases, such as Milky Way LBVs whose distances are based on radial velocities, the distance adopted might be substantially wrong if the star has ...
... attempt to correct for distances along the line-of-sight to further cull the sample of O-type stars, because that may introduce a bias. For example, in many cases, such as Milky Way LBVs whose distances are based on radial velocities, the distance adopted might be substantially wrong if the star has ...
The similarity of the stellar mass fractions of galaxy groups and
... studies mentioned above inferred the total stellar mass by applying a simple stellar M/L ratio conversion. L12 argue that applying a single conversion factor to all galaxies will bias the estimate of fstar , since not all galaxies in groups and clusters are quiescent and furthermore the fraction of ...
... studies mentioned above inferred the total stellar mass by applying a simple stellar M/L ratio conversion. L12 argue that applying a single conversion factor to all galaxies will bias the estimate of fstar , since not all galaxies in groups and clusters are quiescent and furthermore the fraction of ...
Catalogues of isolated galaxies, isolated pairs, and isolated triplets
... observed galaxy properties is not trivial. Galaxies suffer intrinsic and secular evolution processes, but they are also exposed to the influences of their local and large-scale environments. There is a strong correlation of galaxy properties with the environment, such as the morphology-density relat ...
... observed galaxy properties is not trivial. Galaxies suffer intrinsic and secular evolution processes, but they are also exposed to the influences of their local and large-scale environments. There is a strong correlation of galaxy properties with the environment, such as the morphology-density relat ...
Galaxy Disks Further
... Despite the correlations between overall properties, there are galaxies with very similar properties but very different morphologies. M33 and the Large Magellanic Cloud (LMC) provide an example. Both galaxies have very similar central surface brightnesses (∼21.2 B-mag arcsec−2 ), scalelengths (∼1.6 ...
... Despite the correlations between overall properties, there are galaxies with very similar properties but very different morphologies. M33 and the Large Magellanic Cloud (LMC) provide an example. Both galaxies have very similar central surface brightnesses (∼21.2 B-mag arcsec−2 ), scalelengths (∼1.6 ...
The occurrence of nitrogen-enhanced metal
... [Fe/H] = −2.3. Within this metallicity range (triangles) there are only three candidate NEMP stars, one of which (HD25329) we can most likely exclude. The other two are also doubtful cases: HE1410+0213 has an alternative measurement that gives [N/C] < 0, and HE2253-4217 is exactly on the borderline ...
... [Fe/H] = −2.3. Within this metallicity range (triangles) there are only three candidate NEMP stars, one of which (HD25329) we can most likely exclude. The other two are also doubtful cases: HE1410+0213 has an alternative measurement that gives [N/C] < 0, and HE2253-4217 is exactly on the borderline ...
365 days of SKYWATCHING
... the surface, revealing new details. Unlike a star chart, Moon feature instructions are based on lunar topography and not our Earthly cardinal directions. While these pages outline what features should be visible on any given night, the position of the terminator may be slightly different for viewers ...
... the surface, revealing new details. Unlike a star chart, Moon feature instructions are based on lunar topography and not our Earthly cardinal directions. While these pages outline what features should be visible on any given night, the position of the terminator may be slightly different for viewers ...
Fundamental properties of core-collapse Supernova and GRB
... Such glaring discrepancies between observations and the stellar evolution theory exposes a main gap in the understanding of massive stars and highlights our incomplete view of their postMain Sequence evolution and fate. Several reasons exist for explaining our limit knowledge of massive stars. For i ...
... Such glaring discrepancies between observations and the stellar evolution theory exposes a main gap in the understanding of massive stars and highlights our incomplete view of their postMain Sequence evolution and fate. Several reasons exist for explaining our limit knowledge of massive stars. For i ...
PDF hosted at the Radboud Repository of the Radboud University
... has been partially processed by thermonuclear reactions during the explosion. Secondly, corecollapse supernovae are a heterogeneous group of events with significant inherent differences in explosion morphologies, light-curves, brightness and spectral behaviour. Type Ia supernovae, on the other hand, a ...
... has been partially processed by thermonuclear reactions during the explosion. Secondly, corecollapse supernovae are a heterogeneous group of events with significant inherent differences in explosion morphologies, light-curves, brightness and spectral behaviour. Type Ia supernovae, on the other hand, a ...
Multiwavelength Observations of Massive Stellar Cluster Candidates
... Radio observations were made at 8.5 and 4.9 GHz with the Very Large Array (VLA) telescope of the National Radio Astronomy Observatory (NRAO) 3 in August 2008 through observing program AL723. The VLA was in its D array configuration allowing for resolutions of 5-20′′ . At both frequencies, J1331+305 ...
... Radio observations were made at 8.5 and 4.9 GHz with the Very Large Array (VLA) telescope of the National Radio Astronomy Observatory (NRAO) 3 in August 2008 through observing program AL723. The VLA was in its D array configuration allowing for resolutions of 5-20′′ . At both frequencies, J1331+305 ...
Strongly suggested reading: The Milky Way`s stellar disk
... three-dimensional gravitational potential and by implication the dark-matter distribution in the Milky Way. A sequence of ongoing photometry and spectroscopy surveys has recently hundred-folded the number of stars with good distances, radial and transverse velocities, and abundance estimates; this o ...
... three-dimensional gravitational potential and by implication the dark-matter distribution in the Milky Way. A sequence of ongoing photometry and spectroscopy surveys has recently hundred-folded the number of stars with good distances, radial and transverse velocities, and abundance estimates; this o ...
SN 2006gy: DISCOVERY OF THE MOST LUMINOUS
... However, there are reasons to suspect that the mass-loss properties of stars in the local universe may not be so different from these early stars. Namely, recent studies of line-driven winds from O-type stars and WR stars have shown that their winds are highly clumped, requiring that their mass-loss ...
... However, there are reasons to suspect that the mass-loss properties of stars in the local universe may not be so different from these early stars. Namely, recent studies of line-driven winds from O-type stars and WR stars have shown that their winds are highly clumped, requiring that their mass-loss ...
G030086-00 - DCC
... What do I gather from globular cluster and galaxy observations • The only electromagnetically visible BH are those accreting from companion star • Why so many are visible? • Frequent Encounters of binaries with singles tie and tighten up the bigger guy and fling out the smaller guy (s.m. size ones) ...
... What do I gather from globular cluster and galaxy observations • The only electromagnetically visible BH are those accreting from companion star • Why so many are visible? • Frequent Encounters of binaries with singles tie and tighten up the bigger guy and fling out the smaller guy (s.m. size ones) ...
The occurrence of nitrogen-enhanced metal
... owing to internal mixing processes on the RGB. In this paper, however, we prefer to use our criterion (1) because it is consistent with Paper I and our model calculations, but we will subject NEMP stars with [(C + N)/Fe] < 0.9 to critical examination. If we eliminate the 10 “mixed” RGB stars we are ...
... owing to internal mixing processes on the RGB. In this paper, however, we prefer to use our criterion (1) because it is consistent with Paper I and our model calculations, but we will subject NEMP stars with [(C + N)/Fe] < 0.9 to critical examination. If we eliminate the 10 “mixed” RGB stars we are ...
Classification of extremely red objects in the Hubble Ultra Deep Field
... (PI: Mark Dickinson). GOODS/MIPS Data Release v3 was used for our analysis. In addition, groundbased near-infrared images (JHK) of the UDF are taken as part of the GOODS with VLT/ISAAC. GOODS/ISAAC Data Release v1.5 was used for our analysis. They are reduced using an improved version of the ESO/MVM ...
... (PI: Mark Dickinson). GOODS/MIPS Data Release v3 was used for our analysis. In addition, groundbased near-infrared images (JHK) of the UDF are taken as part of the GOODS with VLT/ISAAC. GOODS/ISAAC Data Release v1.5 was used for our analysis. They are reduced using an improved version of the ESO/MVM ...
Debris discs around M stars: non-existence versus non
... their blackbody temperatures and emit at peak wavelengths that are shorter than the observed one. At these small distances from the M star, planetesimals are unlikely to survive or persist for time scales of 300 Myr or longer if the disc is too massive. Conversely, our survival models allow for the ...
... their blackbody temperatures and emit at peak wavelengths that are shorter than the observed one. At these small distances from the M star, planetesimals are unlikely to survive or persist for time scales of 300 Myr or longer if the disc is too massive. Conversely, our survival models allow for the ...
Invited Review The Beginning and Evolution of the Universe
... well as review articles. We begin with discussion of the foundations of the Big Bang Model in § 2, which summarizes research in the half century from Einstein’s foundational paper on modern cosmology until the late 1960s discovery of the CMB radiation, as well as some loose ends. Section 3 discusses ...
... well as review articles. We begin with discussion of the foundations of the Big Bang Model in § 2, which summarizes research in the half century from Einstein’s foundational paper on modern cosmology until the late 1960s discovery of the CMB radiation, as well as some loose ends. Section 3 discusses ...
first results of the qa_2plates procedure
... present, not all the overlap plates are connected with the GSCII project, because at the beginning the Database has been populated with GSCI plates only , while the GSCII plates are loaded sequentially only after the pipeline processing. The fist result obtained by this software has put in evidence ...
... present, not all the overlap plates are connected with the GSCII project, because at the beginning the Database has been populated with GSCI plates only , while the GSCII plates are loaded sequentially only after the pipeline processing. The fist result obtained by this software has put in evidence ...
The Formation and Early Evolution of Young Massive Clusters
... 2011; Moster et al. 2013), when the average gas surface density (and hence inferred protostellar densities) were significantly higher (see e.g. Carilli and Walter 2013). Given that most stars in the solar neighborhood are at a similar age to the Sun (∼5 Gyr: Nordström et al. 2004), does it then mak ...
... 2011; Moster et al. 2013), when the average gas surface density (and hence inferred protostellar densities) were significantly higher (see e.g. Carilli and Walter 2013). Given that most stars in the solar neighborhood are at a similar age to the Sun (∼5 Gyr: Nordström et al. 2004), does it then mak ...
Stars and dust in the Galactic Center
... Field of view for different measurements . . . . . . . . . . . . . . . . . . H II emission maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ISO-SWS spectrum of the GC . . . . . . . . . . . . . . . . . . . . . . . . Color image from J-band SINFONI data . . . . . . . . . . . . . . . . . ...
... Field of view for different measurements . . . . . . . . . . . . . . . . . . H II emission maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ISO-SWS spectrum of the GC . . . . . . . . . . . . . . . . . . . . . . . . Color image from J-band SINFONI data . . . . . . . . . . . . . . . . . ...
ALMA - National Radio Astronomy Observatory
... Energy distribution of dusty star-forming galaxies peaks in far-infrared, near 200 microns. This is also the peak of the energy distribution in the post-reionization Universe; much of the photons and energy in the Universe lie within the ALMA bands Expansion of the Universe redshifts radiation from ...
... Energy distribution of dusty star-forming galaxies peaks in far-infrared, near 200 microns. This is also the peak of the energy distribution in the post-reionization Universe; much of the photons and energy in the Universe lie within the ALMA bands Expansion of the Universe redshifts radiation from ...
Galaxies in the Universe: An Introduction, Second Edition
... We have tried to place material which is relatively more difficult or more intricate at the end of each subsection. Students who find some portions heavy going at a first reading are advised to move to the following subsection and return later to the troublesome passage. Some problems have been include ...
... We have tried to place material which is relatively more difficult or more intricate at the end of each subsection. Students who find some portions heavy going at a first reading are advised to move to the following subsection and return later to the troublesome passage. Some problems have been include ...
Improving Galactic Center Astrometry by Reducing the Effects of
... We present significantly improved proper motion measurements of the Milky Way’s central stellar cluster. These improvements are made possible by refining our astrometric reference frame with a new geometric optical distortion model for the W. M. Keck II 10 m telescope’s Adaptive Optics camera (NIRC2 ...
... We present significantly improved proper motion measurements of the Milky Way’s central stellar cluster. These improvements are made possible by refining our astrometric reference frame with a new geometric optical distortion model for the W. M. Keck II 10 m telescope’s Adaptive Optics camera (NIRC2 ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.