搜索结果: 1-12 共查到“天体物理学 constraining”相关记录12条 . 查询时间(0.093 秒)
Constraining GRB Emission Physics with Extensive Early-Time, Multiband Follow-up
Constraining Emission Physics Extensive Early-Time Multiband Follow-up
2011/10/10
Understanding the origin and diversity of emission processes responsible for Gamma-ray Bursts (GRBs) remains a pressing challenge. While prompt and contemporaneous panchromatic observations have the p...
A Suzaku Observation of MCG-2-58-22: Constraining the Geometry of the Circumnuclear Material
Galaxies: active – X-rays galaxies – Galaxies Individual
2011/8/24
We have analyzed a Suzaku long-look of the active galactic nucleus MCG-2-58-22, a type 1.5 Seyfert with very little X-ray absorption in the line of sight and prominent features arising from reflection...
Future proposed satellite missions as Euclid can offer the opportunity to test general relativity on cosmic scales through mapping of the galaxy weak lensing signal. In this paper we forecast the abil...
Constraining the Redshift Evolution of FIRST Radio Sources in RCS1 Galaxy Clusters
the Redshift Evolution FIRST Radio Sources
2011/1/13
We conduct a statistical analysis of the radio source population in galaxy clusters as a function of redshift by matching radio sources from the Faint Images of the Radio Sky at Twenty-Centimeters (FI...
Catalogs of Hot White Dwarfs in the Milky Way from GALEX's Ultraviolet Sky Surveys. Constraining Stellar Evolution
Astronomical Data Bases catalogues — stars white dwarfs — stars evolution — Galaxy
2010/11/11
We present comprehensive catalogs of hot star candidates in the Milky Way, se-lected from GALEX far-UV (FUV, 1344-1786°A) and near-UV (NUV, 1771-2831°A)imaging. The FUV and NUV photometry allows us to...
Constraining the ages of the fireballs in the wake of the dIrr galaxy VCC1217 / IC3418
Galaxies clusters individual: Virgo Galaxies evolution Galaxies irregular
2010/11/11
Context. A complex of Hα emitting blobs with strong FUV excess is associated to the dIrr galaxy VCC1217 / IC3418 (Hester et al.2010), and extends up to 17 Kpc in the South-East direction. These outsta...
Multi-frequency emission analysis and constraining redshift of 3C 66A
BL Lacertae objects individual galaxies active gamma rays general
2010/11/11
The emission mechanism of TeV blazar 3C 66A is studied by employing the multi-wavelength
observational data. The GeV spectrum observed by Fermi-LAT can’t be explained by pure synchrotron self-Compton...
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)...
Constraining the Minimum Mass of High-Redshift Galaxies and Their Contribution to the Ionization State of the IGM
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/29
We model the latest HST WFPC3/IR observations of > 100 galaxies at redshifts z=7-8 in terms of a hierarchical galaxy formation model with starburst activity. Our model provides a distribution of UV lu...
Constraining halo occupation properties of X-ray AGNs using clustering of Chandra sources in the Bootes survey region
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
We present the most precise measurement to date of the spatial clustering of X-ray selected AGNs using a sample derived from the Chandra X-ray Observatory survey in the Bootes field. The real-space tw...
Constraining the expansion rate of the Universe using low-redshift ellipticals as cosmic chronometers
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/24
We present a new methodology to determine the expansion history of the Universe analyzing the spectral properties of early type galaxies (ETG). We found that for these galaxies the 4000\AA break is a ...
Constraining the Relative Inclinations of the Planets B and C of the Millisecond Pulsar PSR B1257+12
Planetary systems—pulsars general individual (PSR B1257+12)—extrasolar planets
2010/9/15
We investigate on the relative inclination of the planets B and C orbiting the pulsar PSR B1257+12. First, we show that the third Kepler’s law does represent an adequate model for the orbital periods ...