Search Publications
The impact hazard of near-Sun comets
Neslušan, Luboš; Tomko, Dušan
There are several groups of comets with perihelion near the solar surface known. Of these, the Marsden and Kracht groups move in orbits situated in a spatial corridor of the daytime Arietid meteoroid stream. The orbits of comets of the Meyer group are not very different from those of the Marsden and Kracht groups; for the purpose of our study, we …
The cosmic environment overtakes the local density in shaping galaxy star formation
Fang, Min; Bian, Fuyan; Huang, Jia-Sheng +11 more
The gas supply from the cosmic web is the key to sustain star formation in galaxies. It remains to be explored how the cosmic large-scale structure (LSS) effects on galaxy evolution at given local environments. We examine galaxy-specific star formation rate as a function of local density in a LSS at z = 0.735 in the Extended Chandra Deep Field Sou…
Physical conditions and chemical abundances of the variable planetary nebula IC 4997
Parthasarathy, M.; Danehkar, A.
The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and chemical abundances of this object using the collisionally excited lines (CELs) and optical recombination lines (ORLs) measured from…
Astrometry of variable compact radio sources: a search for Galactic black hole X-ray binaries
Maccarone, T. J.; Heinke, C. O.; Miller-Jones, J. C. A. +8 more
We use the Very Long Baseline Array to conduct high precision astrometry of a sample of 33 compact, flat spectrum, variable radio sources in the direction of the Galactic plane (Becker et al. 2010). Although Becker et al. (2010) ruled out a few potential scenarios for the origin of the radio emission, the study could not rule out that these source…
Signatures of extended discs and outflows in the circumgalactic medium using the Q0107 quasar triplet
Tejos, Nicolas; Beckett, Alexander; Morris, Simon L. +3 more
We use H I absorption along the lines-of-sight to the Q0107 quasar triplet in order to model potential disc and outflow structures in the circumgalactic medium of intervening galaxies at z ≲ 1, as well as the intergalactic medium on scales of up to a few virial radii. We consider a sample of twelve isolated galaxies in the Q0107 field with positio…
Searching for outbursts in the ground-based photometry of 67P/Churyumov-Gerasimenko
Gardener, Daniel; Snodgrass, Colin; Ligier, Nicolas
67P/Churyumov-Gerasimenko is a Jupiter-family comet that was the target of the Rosetta mission, the first mission to successfully orbit and land a probe on a comet. This mission was accompanied by a large ground-based observing campaign. We have developed a pipeline to calibrate and measure photometry of comet 67P during its 2016 perihelion passag…
Kepler binary stars in NGC 6791 open cluster: KIC 2437060, KIC 2437149, and KIC 2438490
Çakırlı, Ömür; Hoyman, Barış
The study of detached eclipsing binaries in open clusters can provide powerful tests of theoretical stellar evolutionary models. These models must simultaneously fit the masses, radii, and radiative properties of the eclipsing stars with essentially the same distance, age, and initial composition. In this way, clusters are ideal test benches for v…
The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms
Infante, L.; Metcalfe, N.; Shanks, T. +5 more
We compare the contribution of active galactic nuclei (AGNs) and star formation towards dust heating in sub-mm galaxies (SMGs). We have used ALMA at 0.1-arcsec resolution to image a complete flux-limited sample of seven sub-mm sources previously shown to have spectral energy distributions that were as well-fitted by obscured AGN as star-forming ga…
Rising of a magnetic null point in the wake of an erupting flux rope
Filippov, Boris
Arcades of flare loops rise, slowing down in the wake of eruptive prominences. They lag significantly from the top of prominences and do not reach too great heights in the corona. It is widely accepted that their evolution is governed by the limited reconnection rate in the current sheet developed below the eruptive prominence. We suggest that the…
The gMOSS: the galaxy survey and galaxy populations of the large homogeneous field
Movsessian, T. A.; Dodonov, S. N.; Kotov, S. S. +1 more
We present the gMOSS (Galaxies of Medium-band One-meter Schmidt telescope Survey) catalogue of ~19 000 galaxies in 20 filters (4 broad-band SDSS and 16 medium-band filters). We observed 2.386 deg2 on the central part of the HS47.5-22 field with the 1-m Schmidt telescope of the Byurakan Astrophysical Observatory. The gMOSS is a complete …