Search Publications
Non-LTE models for synthetic spectra of type Ia supernovae. III. An accelerated lambda-iteration procedure for the mutual interaction of strong spectral lines in SN Ia models with and without energy deposition
Pauldrach, A. W. A.; Hoffmann, T. L.; Hultzsch, P. J. N.
Context. In type Ia supernova (SN Ia) envelopes a huge number of lines of different elements overlap within their thermal Doppler widths, and this problem is exacerbated by the circumstance that up to 20% of these lines can have a line optical depth higher than 1. The stagnation of the lambda iteration in such optically thick cases is one of the f…
The Time-dependent Chemistry of Cometary Debris in the Solar Corona
Bryans, P.; Pesnell, W. D.
Recent improvements in solar observations have greatly progressed the study of sungrazing comets. They can now be imaged along the entirety of their perihelion passage through the solar atmosphere, revealing details of their composition and structure not measurable through previous observations in the less volatile region of the orbit further from…
Milky Way dust extinction measured with QSOs
Wolf, Christian
We investigate reddening by Milky Way dust in the low-extinction regime of E(B - V) < 0.15. Using over 50 000 QSOs at 0.5 < z < 2.5 from the Sloan Digital Sky Survey (SDSS) data release 7 (DR7) QSO Catalogue, we probe the residual SDSS colours after dereddening and correcting for the known spectroscopic redshifts. We find that the extinct…
Initiation and Early Evolution of the Coronal Mass Ejection on 2009 May 13 from Extreme-ultraviolet and White-light Observations
Reva, A. A.; Ulyanov, A. S.; Kuzin, S. V. +1 more
We present the results of the observations of a coronal mass ejection (CME) that occurred on 2009 May 13. The most important feature of these observations is that the CME was observed from the very early stage (the solar surface) up to a distance of 15 solar radii (R ⊙). Below 2 R ⊙, we used the data from the TESIS extreme-ul…
CDM/baryon isocurvature perturbations in a sneutrino curvaton model
Kawasaki, Masahiro; Harigaya, Keisuke; Hayakawa, Taku +1 more
Matter isocurvature perturbations are strictly constrained from cosmic microwave background observations. We study a sneutrino curvaton model where both cold dark matter (CDM)/baryon isocurvature perturbations are generated. In our model, total matter isocurvature perturbations are reduced since the CDM/baryon isocurvature perturbations compensate…
Herschel-ATLAS/GAMA: How does the far-IR luminosity function depend on galaxy group properties?
Ivison, R. J.; Dunne, L.; Eales, S. +15 more
We use the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) Phase I data to study the conditional luminosity function of far-IR (250 µm) selected galaxies in optically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) spectroscopic survey, as well as environmental effects on the far-IR-to-optical colour. We applied …
Forecast of solar proton flux profiles for well-connected events
Moon, Yong-Jae; Ji, Eun-Young; Park, Jinhye
We have developed a forecast model of solar proton flux profiles (> 10 MeV channel) for well-connected events. Among 136 solar proton events (SPEs) from 1986 to 2006, we select 49 well-connected ones that are all associated with single X-ray flares stronger than M1 class and start to increase within 4 h after their X-ray peak times. These event…
Do Solar Coronal Holes Affect the Properties of Solar Energetic Particle Events?
Arge, C. N.; Gopalswamy, N.; Kahler, S. W. +1 more
The intensities and timescales of gradual solar energetic particle (SEP) events at 1 AU may depend not only on the characteristics of shocks driven by coronal mass ejections (CMEs), but also on large-scale coronal and interplanetary structures. It has long been suspected that the presence of coronal holes (CHs) near the CMEs or near the 1-AU magne…
Episodic star formation in a group of LAEs at z = 5.07.
Mas-Hesse, J. M.; Cava, A.; Gonzalez-Martin, O. +10 more
We are undertaking a search for high-redshift low-luminosity Lyman Alpha sources in the SHARDS (Survey for High-z Absorption Red and Dead Sources) survey. Among the pre-selected Lyman Alpha sources two candidates were spotted, located 3.19 arcsec apart, and tentatively at the same redshift. Here, we report on the spectroscopic confirmation with Gr…
Initial Results from NuSTAR Observations of the Norma Arm
Hailey, Charles J.; Mori, Kaya; Bauer, Franz E. +13 more
Results are presented for an initial survey of the Norma Arm gathered with the focusing hard X-Ray Telescope NuSTAR. The survey covers 0.2 deg2 of sky area in the 3-79 keV range with a minimum and maximum raw depth of 15 ks and 135 ks, respectively. Besides a bright black-hole X-ray binary in outburst (4U 1630-47) and a new X-ray transi…