Search Publications
Kinematics of the Milky Way from the Gaia EDR3 red giants and subgiants
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +2 more
We present the results of the kinematic investigations carried out with the use of spatial velocities of red giants and subgiants contained in the Gaia EDR3 catalogue. The 12 kinematic parameters of the Ogorodnikov-Milne model have been derived for stellar systems with radii of 0.5 and 1.0 kpc, located along the direction of the Galactic Centre-th…
Dust in the central parsecs of unobscured AGN: more challenges to the torus
Nadolny, Jakub; Prieto, M. Almudena; Fernández-Ontiveros, Juan A. +1 more
A parsec-scale dusty torus is thought to be the cause of active galactic nuclei (AGN) dichotomy in the 1/2 types, narrow/broad emission lines. In a previous work, on the basis of parsec-scale resolution infrared/optical dust maps, it was found that dust filaments, few parsecs wide and several hundred parsecs long, were ubiquitous features crossing…
The stellar system HIP 101227: is it a binary, a triple or a quadruple system?
Annuar, Adlyka; Al-Wardat, Mashhoor; Yousef, Zahra Talal +4 more
In this paper, we present the analysis of the stellar system HIP 101227 to determine the actual number of components in the system, and their properties. We use dynamical modeling and complex spectrophotometric (involving atmospheric modeling) techniques with recent data, to determine the physical properties and orbital solution for the system, re…
The nature of sub-millimetre galaxies I: a comparison of AGN and star-forming galaxy SED fits
Wang, L.; Heywood, I.; Metcalfe, N. +3 more
High-redshift sub-millimetre galaxies (SMGs) are usually assumed to be powered by star formation. However, it has been clear for some time that >20 per cent of such sourcesbrighter than ≈3 mJy host quasars. Here, we analyse a complete sample of 12 sub-mm LABOCA/ALMA 870-µm sources in the centre of the William Herschel Deep Field (WHDF) wi…
Observational Evidence Points at AGB Stars as Possible Progenitors of CEMP-s and CEMP-r/s Stars
Goswami, Aruna; Purandardas, Meenakshi
The origin of enhanced abundance of heavy elements observed in the surface chemical composition of carbon-enhanced metal-poor (CEMP) stars still remains poorly understood. Here, we present detailed abundance analysis of seven CEMP stars based on high-resolution (R ~ 50,000) spectra that reveal enough evidence of asymptotic giant branch (AGB) stars…
Lessons from the First Multiply Imaged Supernova: Revised Strong-lensing Models for the Galaxy Cluster MACS J1149.5+2223
Zitrin, Adi
We present two grid-based lens models for the galaxy cluster MACS J1149.5+2223, concentrating on the properties of the first multiply imaged supernova Refsdal, which first appeared in this cluster as an Einstein cross (images S1-S4) around a cluster galaxy in late 2014, and about a year later as an additional image (SX) in a different image of the…
On the size distribution of spots within sunspot groups
Solanki, Sami K.; Krivova, Natalie A.; Mandal, Sudip +1 more
The size distribution of sunspots provides key information about the generation and emergence processes of the solar magnetic field. Previous studies of size distribution have primarily focused on either the whole group or individual spot areas. In this paper we investigate the organisation of spot areas within sunspot groups. In particular, we an…
Ice-rich landforms of the southern mid-latitudes of Mars: A case study in Nereidum Montes
Crown, David A.; Berman, Daniel C.; Smith, Isaac B. +1 more
Mapping of Viscous Flow Features (VFFs), a general grouping of ice-rich flow features that includes Lobate Debris Aprons (LDA), Concentric Crater Fill (CCF), Lineated Valley Flow (LVF), small lobate flows (i.e., glacier-like flows, or GLFs), and arcuate ridges, in the southern hemisphere of Mars shows a dense concentration in Nereidum Montes, alon…
Local Environments of Low-redshift Supernovae
Sandstrom, Karin M.; Leroy, Adam K.; Koch, Eric W. +7 more
We characterize the local (2 kpc sized) environments of Type Ia, II, and Ib/c supernovae (SNe) that have recently occurred in nearby (d ≲ 50 Mpc) galaxies. Using ultraviolet (UV; from Galaxy Evolution Explorer) and infrared (IR; from Wide-field Infrared Survey Explorer) maps of 359 galaxies and a sample of 472 SNe, we measure the star formation ra…
Small lobe of comet 67P: Characterization of the Wosret region with ROSETTA-OSIRIS
Sierks, H.; Barucci, M. A.; Fornasier, S. +3 more
Aims: We investigated Wosret, a region located on the small lobe of the 67P/Churyumov-Gerasimenko comet subject to strong heating during the perihelion passage. This region includes the two last landing sites of the Philae lander as well as, notably the final one, Abydos, where the lander performed most of its measurements. We study Wosret in…