搜索结果: 1-15 共查到“天体物理学其他学科 Mass”相关记录17条 . 查询时间(0.066 秒)
Reconciling a significant hierarchical assembly of massive early-type galaxies at z<~1 with mass downsizing
massive early-type galaxies Cosmology and Extragalactic Astrophysics
2011/1/11
Hierarchical models predict that massive early-type galaxies (mETGs) are the latest systems to be in place into the cosmic scenario (at z<~0.5), conflicting with the observational phenomenon of galaxy...
The impact of realistic models of mass segregation on the event rate of extreme-mass ratio inspirals and cusp re-growth
realistic models mass segregation the event rate
2011/1/11
One of the most interesting sources of gravitational waves (GWs) for LISA is the inspiral of compact objects on to a massive black hole (MBH), commonly referred to as an "extreme-mass ratio inspiral" ...
Multiwavelength Observations of Accretion in Low-Mass X-ray Binary Systems
Multiwavelength Observations Accretion Low-Mass X-ray Binary Systems
2011/1/11
This work is intended to provide an introduction to multiwavelength observations of low-mass X-ray binaries and the techniques used to analyze and interpret their data. The focus will primarily be on ...
Current cosmic microwave background (CMB) bounds on the sum of the neutrino masses assume a sudden reionization scenario described by a single parameter that determines the onset of reionization. We i...
Cosmic Chemical Evolution with an Early Population of Intermediate Mass Stars
Cosmic Chemical Evolution Intermediate Mass Stars
2011/1/11
We explore the consequences of an early population of intermediate mass stars in the 2 - 8 M\odot range on cosmic chemical evolution. We discuss the implications of this population as it pertains to s...
The mass-loss rates of red supergiants and the de Jager prescription
The mass-loss rates of red supergiants the de Jager prescription
2011/1/11
Mass loss of red supergiants (RSG) is important for the evolution of massive stars, but is not fully explained. Several empirical prescriptions have been proposed, trying to express the mass-loss rate...
Mechanism for the Suppression of Intermediate-Mass Black Holes
the Suppression Intermediate-Mass Black Holes
2011/1/11
A model for the formation of supermassive primordial black holes in galactic nuclei with the simultaneous suppression of the formation of intermediate-mass black holes is presented. A bimodal mass fun...
Sub-Chandrasekhar Mass Models For Type Ia Supernovae
Sub-Chandrasekhar Mass Models Type Ia Supernovae
2011/1/11
For white dwarfs accreting hydrogen or helium at rates in the range 1 to 5 x 10^(-8) Msun/yr, a variety of explosive outcomes are possible well before the star reaches the Chandrasekhar mass. The expl...
The Genesis of an Impulsive Coronal Mass Ejection observed at Ultra-High Cadence by AIA on SDO
Impulsive Coronal Ultra-High Cadence AIA on SDO
2011/1/11
The study of fast, eruptive events in the low solar corona is one of the science objectives of the Atmospheric Imaging Assembly (AIA) imagers on the recently launched Solar Dynamics Observatory (SDO),...
An Initial Mass Function for Individual Stars in Galactic Disks: I. Constraining the Shape of the IMF
Galaxy Astrophysics (astro-ph.GA)
2010/12/29
We derive a semi-empirical galactic initial mass function (IMF) from observational constraints. We assume that the star formation rate in a galaxy can be expressed as the product of the IMF, $\psi (m)...
The evolution of luminosity, colour and the mass-to-luminosity ratio of Galactic open clusters: comparison of discrete vs. continuous IMF models
Galaxy Astrophysics (astro-ph.GA)
2010/12/29
We found in previous studies that standard Simple Stellar Population (SSP) models are unable to describe or explain the colours of Galactic open clusters both in the visible and in the NIR spectral ra...
Evolution and nucleosynthesis of extremely metal-poor and metal-free low- and intermediate-mass stars II. s-process nucleosynthesis during the core He flash
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
Models of primordial and hyper-metal-poor stars with masses similar to the Sun experience an ingestion of protons into the hot core during the core helium flash phase at the end of their red giant bra...
A sub-Saturn Mass Planet, MOA-2009-BLG-319Lb
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/28
We report the gravitational microlensing discovery of a sub-Saturn mass planet, MOA-2009-BLG-319Lb, orbiting a K or M-dwarf star in the inner Galactic disk or Galactic bulge. The high cadence observat...
Dependence of Star Formation Activity On Stellar Mass and Environment From the Redshift One LDSS-3 Emission Line Survey (ROLES)
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
Using the sample from the \it Redshift One LDSS3 Emission line Survey \rm (ROLES), we probe the dependence of star formation rate (SFR) and specific star formation rate (sSFR) as a function of stellar...
HAT-P-26b: A Low-Density Neptune-Mass Planet Transiting a K Star
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
We report the discovery of HAT-P-26b, a transiting extrasolar planet orbiting the moderately bright V=11.744 K1 dwarf star GSC 0320-01027, with a period P = 4.234516 +- 0.000015 d, transit epoch Tc = ...