搜索结果: 1-12 共查到“天文学 limits”相关记录12条 . 查询时间(0.066 秒)
Sensitive limits on the water abundance in cold low-mass molecular cores
formation submil
2014/12/26
We present Submillimeter Wave Astronomy Satellite observations of water vapor in two cold starless clouds, B68 and core D in ρ Ophiuchi. Sensitive nondetections of the 110-101 transition of o-H2O are ...
Although the existence of large-scale hot gaseous halos around massive disk galaxies has been theorized for a long time, there is yet very little observational evidence. We report the Chandra and XMM-...
Searching for Saturn's Dust Swarm: Limits on the size distribution of Irregular Satellites from km to micron sizes
Solar System: satellites
2011/10/8
We describe a search for dust created in collisions between the Saturnian irregular satellites using archival \emph{Spitzer} MIPS observations. Although we detected a degree scale Saturn-centric exces...
Sparse aperture masking at the VLT I. Faint companion detection limits for the two debris disk stars HD 92945 and HD 141569
Instrumentation: high angular resolution – Stars: planetary systems – Stars: individual
2011/9/29
Observational data on companion statistics around young stellar systems is needed to flesh out the formation pathways for extrasolar planets and brown dwarfs. Aperture masking is a new technique that ...
Spin-Dependent Limits from the DRIFT-IId Directional Dark Matter Detector
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
Data are presented from the DRIFT-IId detector housed in the Boulby mine in northeast England. A 0.8 m^3 fiducial volume, containing partial pressures of 30 Torr CS2 and 10 Torr CF4, was exposed for a...
Planetary detection limits taking into account stellar noise. I. Observational strategies to reduce stellar oscillation and granulation effects
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/29
The radial velocity signature of stellar noise is small, around the meter-per-second, but already too much for the detection of Earth mass planets in habitable zones. In this paper, we address the imp...
Quasar variability limits on cosmological density of cosmic strings
Quasar variability limits cosmological density cosmic strings
2010/3/19
We put robust upper limits on the average cosmological density \Omega_s of cosmic strings based on the variability properties of a large homogeneous sample of SDSS quasars. We search for an excess of ...
Alma：exploring the outer limits of astronomy。
Confidence limits of sn, kinetic energy and chemical yields in evolutionary synthesis models
Confidence limits kinetic energy sn chemical yields
2009/6/11
Confidence limits of sn, kinetic energy and chemical yields in evolutionary synthesis models。
We have examined 426 Voyager fields distributed across the sky
for O VI ( 1032/1038 Å) emission from the Galactic diffuse interstellar
medium. No such emission was detected in any of our obs...
On New Limits of the Coefficient of Gravitation Shielding
Gravitation shielding lower limits
2009/5/7
New limits of the shielding coefficients in the supposed phenomenon
of gravitation shielding have recently become available. The new
values are briefly reviewed and discussed in order to update the ...
Research Note On New Limits of the Coefficient of Gravitation Shielding
Gravitation shielding lower limits
2010/9/16
New limits of the shielding coefficients in the supposed phenomenon of gravitation shielding have recently become available. The new values are briefly reviewed and discussed in order to update the st...
