搜索结果: 1-15 共查到“天文学 e disc”相关记录28条 . 查询时间(0.046 秒)
Physical parameter eclipse mapping of the quiescent disc in V2051 Ophiuchi
V2051 Oph cataclysmic variables
2014/12/26
We analyse simultaneous UBVR quiescent light curves of the cataclysmic variable V2051 Oph using the Physical Parameter Eclipse Mapping (PPEM) method in order to map the gas temperature and surface den...
We consider the sensitivity of the circular-orbit adiabatic contraction approximation to the baryon condensation rate and the orbital structure of dark matter haloes in the Λ cold dark matter (ΛCDM) p...
Chandra observation of the edge-on spiral NGC 5775: probing the hot galactic disc/halo connection
individual (NGC 5775) general
2014/12/23
We study the edge-on galaxy NGC 5775, utilizing a 58.2 ks Chandra ACIS-S observation together with complementary Hubble Space Telescope (HST) ACS, Spitzer IRAC and other multi-wavelength data sets. Th...
Intrinsic disc emission and the Soft X-ray Excess in AGN
X-rays: accretion discs black hole physics
2011/10/18
Narrow Line Seyfert 1 (NLS1) galaxies have low mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should peak in the EUV. However, the ...
The final parsec problem: aligning a binary with an external accretion disc
accretion accretion discs – black hole physics – galaxies evolution – stars formation – planets and satellites: formation
2011/10/21
We consider the interaction between a binary system (e.g. two supermassive black holes or two stars) and an external accretion disc with misaligned angular momentum. This situation occurs in galaxy me...
Chemistry in a gravitationally unstable protoplanetary disc
stars: pre-main-sequence, stars: circumstellar matter, protoplanetary discs, astrochemistry
2011/10/9
Until now, axisymmetric, alpha-disc models have been adopted for calculations of the chemical composition of protoplanetary discs. While this approach is reasonable for many discs, it is not appropria...
The Jeans Mass as a Fundamental Measure of Self-Gravitating Disc Fragmentation and Initial Fragment Mass
stars: formation accretion accretion discs methods:analytical
2011/9/28
As a formation route for objects such as giant planets and low-mass stars in protostellar discs (as well as stars in AGN discs), theories of self-gravitating disc fragmentation need to be able to pred...
Star formation history, double degenerates and type Ia supernovae in the thin disc
stars: white dwarfs − stars: evolution − stars: binaries: close − supernovae: general − Galaxy: evolution − Galaxy: structure
2011/9/27
We investigate the relation between the star formation history and the evolution of the double-degenerate (DD) population in the thin disc of the Galaxy, which we assume to have formed 10 Gyr before t...
Multi-Wavelength Modelling of the Beta Leo Debris Disc: 1, 2 or 3 planetesimal populations?
Multi-Wavelength Modelling Beta Leo Debris Disc planetesimal populations
2011/9/27
In this paper we present a model of the Beta Leo debris disc, with an emphasis on modelling the resolved PACS images obtained as part of the Herschel key programme DEBRIS. We also present new SPIRE im...
Varying disc-magnetosphere coupling as the origin of pulse profile variability in SAX J1808.4-3658
accretion accretion discs – pulsars:individual:SAX J1808.4–3658 – stars:neu-tron – X-rays:binaries
2011/9/26
Accreting millisecond pulsars show significant variability of their pulse profiles, especially at low accretion rates. On the other hand, their X-ray spectra are remarkably similar with not much varia...
The role of the initial surface density profiles of the disc on giant planet formation: comparing with observations
the initial surface density profiles the disc on giant planet formation
2011/1/10
In order to explain the main characteristics of the observed population of extrasolar planets and the giant planets in the Solar System, we need to get a clear understanding of which are the initial c...
The kinematic identification of a thick stellar disc in M31
The kinematic identification stellar disc
2011/1/11
Submitted on 25 Oct 2010 (v1), last revised 21 Dec 2010 (this version, v2))
Abstract: We present the first characterization of a thick disc component in the Andromeda galaxy (M31) using kinematic dat...
On the Nature of the HII Regions in the Extended Ultraviolet Disc of NGC 4625
galaxies abundances galaxies structure galaxies ISM galaxies individual NGC 4625
2010/11/12
Using deep Subaru/FOCAS spectra of 34 Hii regions in both the inner and outer parts of the extended ultraviolet (XUV) disc galaxy NGC 4625 we have measured an abundance gradient out to almost 2.5 time...
On the source of dense outflows from T Tauri Stars. and III. Winds driven from the star-disc shear layer
stars pre-main-sequence stars: winds outflows stars circumstellar matter – stars formation
2010/11/11
Ultraviolet observations of classical T Tauri Stars (cTTSs) have shown that there is a hot (Te ≃ 80, 000 K) and dense (ne ≃ 1010 cm−3) component associated with the large scale jet. ...
The similarity of observed X-ray coronae associated with L* disc and elliptical galaxies
galaxies:formation – galaxies haloes – galaxies cooling flows – galaxies intergalactic intergalactic
2010/11/12
The existence of hot, X-ray luminous gaseous coronae surrounding present day L? galaxies
is a generic prediction of galaxy formation theory in the cold dark matter cosmogony.
While extended X-ray em...