Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Hjalmarsdotter, L"'
At high luminosities black hole binaries show spectra with a strong disc component accompanied by an equally strong tail where at least some of the electrons are non-thermal. We reanalyze the simultaneous ASCA-RXTE-OSSE data from the 1998 outburst of
Externí odkaz:
http://arxiv.org/abs/1502.07135
Autor:
Shakura, N. I., Postnov, K. A., Kochetkova, A. Yu., Hjalmarsdotter, L., Sidoli, L., Paizis, A.
Publikováno v:
Astronomy Reports, vol. 59, No 7, p. 645-655 (2015)
A review of wind accretion in HMXB is presented. We focus on different regimes of quasi-spherical accretion onto a NS: supersonic (Bondi) accretion, which takes place when the captured matter cools down rapidly and falls supersonically towards the NS
Externí odkaz:
http://arxiv.org/abs/1407.3163
Strong magnetic field of accreting neutron stars ($10^{14}$ G) is hard to probe by X-ray spectroscopy but can be indirectly inferred from spin-up/spin-down measurement in X-ray pulsars. The existing observations of slowly rotating X-ray pulsars are d
Externí odkaz:
http://arxiv.org/abs/1307.3032
A review of wind accretion in high-mass X-ray binaries is presented. We focus attention to different regimes of quasi-spherical accretion onto the neutron star: the supersonic (Bondi) accretion, which takes place when the captured matter cools down r
Externí odkaz:
http://arxiv.org/abs/1307.3029
Publikováno v:
Physics Uspekhi 56 (2013) 321
Quasi-spherical subsonic accretion onto slowly rotating magnetized NS is considered, when the accreting matter settles down subsonically onto the rotating magnetosphere, forming an extended quasi-static shell. The shell mediates the angular momentum
Externí odkaz:
http://arxiv.org/abs/1302.0500
We extract the spectra of the fastest variability (above 10 Hz) from the black hole XTE J1550-564 during a transition from hard to soft state on the rise to outburst. We confirm previous results that the rapid variability contains no significant disc
Externí odkaz:
http://arxiv.org/abs/1301.0627
Quasi-spherical subsonic accretion can be realized in slowly rotating wind-fed X-ray pulsars (XPSRs) at X-ray luminosities <4 10^{36} erg/s. In this regime the accreting matter settles down subsonically onto the rotating magnetosphere, forming an ext
Externí odkaz:
http://arxiv.org/abs/1212.2841
We elaborate on a recently proposed model for subsonic quasi-spherical accretion onto slowly rotating pulsars, in which accretion is mediated through a hot quasi-static shell above the neutron star magnetosphere. We show that under the same external
Externí odkaz:
http://arxiv.org/abs/1209.4962
Autor:
Larsson, S., Fuhrmann, L., Weiss, A., Angelakis, E., Krichbaum, T. P., Nestoras, I., Zensus, J. A., Axelsson, M., Nilsson, D., Ryde, F., Hjalmarsdotter, L., Larsson, J., Lundgren, A., Mac-Auliffe, F., Parra, R., Siringo, G.
So far, no systematic long-term blazar monitoring programs and detailed variability studies exist at sub-mm wavelengths. Here, we present a new sub-mm blazar monitoring program using the APEX 12-m telescope. A sample of about 40 gamma-ray blazars has
Externí odkaz:
http://arxiv.org/abs/1206.3799
Quasi-spherical accretion in wind-fed X-ray pulsars is discussed. At X-ray luminosities <4 10^{36} erg/s, a hot convective shell is formed around the neutron star magnetosphere, and subsonic settling accretion regime sets in. In this regime, accretio
Externí odkaz:
http://arxiv.org/abs/1111.1382