Search Publications
Missions
Journals
Publication Years
The ISM local to the runaway star WR16
Noriega-Crespo, A.; Reynoso, E. M.; Cichowolski, S. +3 more
Massive stars leave their imprint on the interstellar medium as they radiate their energy and undergo episodes of mass ejection throughout their lives. In this paper, we analyse the case of the Wolf-Rayet star WR16 combining archival multiwavelength data with new molecular observations obtained with the Atacama Submillimeter Telescope Experiment (…
Spatial and Temporal Variability of the 365-nm Albedo of Venus Observed by the Camera on Board Venus Express
Schröder, S. E.; Kouyama, T.; Imamura, T. +4 more
We mapped the distribution of the 365-nm albedo of the Venus atmosphere over the years 2006-2014, using images acquired by the Venus Monitoring Camera (VMC) on board Venus Express. We selected all images with a global view of Venus to investigate how the albedo depends on longitude. Bertaux et al. (2016,
Optical and X-ray studies of three polars: RX J0859.1+0537, RX J0749.1-0549, and RX J0649.8-0737
Raj, Ashish; Pandey, J. C.; Singh, K. P. +3 more
We present optical photometric and spectroscopic observations, and an analysis of archival X-ray data of three polars: RX J0859.1+0537, RX J0749.1-0549, and RX J0649.8-0737. Optical light curves of these three polars reveal eclipse-like features that are deep, total, and variable in shape. The optical and X-ray modulations of RX J0859.1+0537, RX J…
X-ray properties of dwarf nova EY Cyg and the companion star using an XMM-Newton observation
Balman, Şölen; Nabizadeh, Armin
We present the X-ray analysis of dwarf nova EY Cyg using the 45 ks XMM-Newton observatory archival data obtained in quiescence. We find orbital modulations in X-rays. We simultaneously fitted EPIC pn, MOS1 and MOS2 data using a model for interstellar medium absorption (tbabs) and a multi-temperature plasma emission model with a power-law distribut…
Solar-metallicity gas in the extended halo of a galaxy at z ∼ 0.12
Pradeep, Jayadev; Narayanan, Anand; Khaire, Vikram +4 more
We present the detection and analysis of a weak low-ionization absorber at z = 0.121 22 along the sightline of the blazar PG 1424+240, using spectroscopic data from both HST/COS and STIS. The absorber is a weak Mg II analogue, with an incidence of weak C II and Si II, along with multicomponent C IV and O VI. The low ions are tracing a dense (n
Magnetic Flux Emergence in a Coronal Hole
Denker, Carsten; Temmer, Manuela; Veronig, Astrid +13 more
A joint campaign of various space-borne and ground-based observatories, comprising the Japanese Hinode mission (Hinode Observing Plan 338, 20 - 30 September 2017), the GREGOR solar telescope, and the Vacuum Tower Telescope (VTT), investigated numerous targets such as pores, sunspots, and coronal holes. In this study, we focus on the coronal hole r…
Electromagnetic counterparts to gravitational wave events from Gaia
Harrison, D. L.; Koposov, S. E.; Evans, D. W. +15 more
The recent discoveries of gravitational wave events and in one case also its electromagnetic (EM) counterpart allow us to study the Universe in a novel way. The increased sensitivity of the LIGO and Virgo detectors has opened the possibility for regular detections of EM transient events from mergers of stellar remnants. Gravitational wave sources …
A comparative analysis of denoising algorithms for extragalactic imaging surveys
Castellano, M.; Merlin, E.; Fontana, A. +4 more
Aims: We present a comprehensive analysis of the performance of noise-reduction (denoising) algorithms to determine whether they provide advantages in source detection, mitigating noise on extragalactic survey images.
Methods: The methods we analyze here are representative of different algorithmic families: Perona-Malik filtering, bilate…
Characterizing continuum variability in the radio-loud narrow-line Seyfert 1 galaxy IRAS 17020+4544
Fabian, A. C.; Gallo, L. C.; Alston, W. N. +4 more
We present results of temporal and spectral analyses on four XMM-Newton EPIC pn observations of IRAS 17020+4544, a narrow-line Seyfert 1 galaxy with evidence of a radio jet. Analysis of the light curves reveals that this radio-loud source does not behave like the bulk population of its radio-quiet counterparts. A trend of spectral hardening with i…
Shape model and spin state of non-principal axis rotator (5247) Krylov
Duffard, R.; Marciniak, A.; Ďurech, J. +12 more
Context. The study of non-principal axis (NPA) rotators can provide important clues to the evolution of the spin state of asteroids. However, very few studies to date have focused on NPA-rotating main belt asteroids (MBAs). One MBA known to be in an excited rotation state is asteroid (5247) Krylov.
Aims: By using disk-integrated photometric d…