Search Publications
The five axes of the Turtle: symmetry and asymmetry in NGC 6210
López, J. A.; Henney, William J.; García-Díaz, Ma T. +1 more
We carry out a comprehensive kinematic and morphological study of the asymmetrical planetary nebula: NGC 6210, known as the Turtle. The nebula's spectacularly chaotic appearance has led to proposals that it was shaped by mass transfer in a triple star system. We study the three-dimensional structure and kinematics of its shells, lobes, knots, and …
Broadened profiles of diffuse interstellar bands
Krełowski, J.; Galazutdinov, G. A.; Siebenmorgen, R. +3 more
The paper describes profile broadening and peak wavelength variation of diffuse interstellar bands (DIBs) measured for 46 lines of sight, probably caused by the physical properties of intervening clouds. The full width at half-maximum of four studied DIBs (5780, 5797, 6196 and 6614 Å) demonstrates strong variability, sometimes doubling the widths …
BG Tri: an example of a low-inclination RW Sex-type nova-like
Gänsicke, B. T.; Steeghs, D.; Rodríguez-Gil, P. +4 more
We analyse a wealth of optical spectroscopic and photometric observations of the bright (V = 11.9) cataclysmic variable BG Tri. The Gaia DR2 parallax gives a distance d = 334(8) pc to the source, making the object one of the intrinsically brightest nova-like variables seen under a low orbital inclination angle. Time-resolved spectroscopic observat…
Emission line galaxies in the SHARDS Frontier Fields - I. Candidate selection and the discovery of bursty Hα emitters
Pérez-González, Pablo G.; Conselice, Christopher J.; Ferreira, Leonardo +7 more
Emission line galaxies provide a crucial tool for the study of galaxy formation and evolution, providing a means to trace a galaxy's star formation history or metal enrichment, and to identify galaxies at a range of stellar masses. In this paper, we present a study of emission line galaxies in the Survey for High-z Absorption Red and Dead Sources …
Soft gamma-ray selected giant radio galaxies: an update
Masetti, N.; Venturi, T.; Dallacasa, D. +9 more
We present an update on the sample of soft gamma-ray selected giant radio galaxies (GRGs) extracted from INTEGRAL/IBIS and Swift/BAT surveys; it includes eight new sources and one candidate object. In the new sample, all but one source display FR II radio morphologies; the only exception is B21144+35B, which is an FR I. The objects belong to both …
On the vanishing orbital X-ray variability of the eclipsing binary millisecond pulsar 47 Tuc W
Heinke, C. O.; Romani, R. W.; Freire, P. C. C. +2 more
Redback millisecond pulsars (MSPs) typically show pronounced orbital variability in their X-ray emission due to our changing view of the intrabinary shock (IBS) between the pulsar wind and stellar wind from the companion. Some redbacks ('transitional' MSPs) have shown dramatic changes in their multiwavelength properties, indicating a transition fr…
V772 Cas: an ellipsoidal HgMn star in an eclipsing binary
Shultz, M. E.; Kochukhov, O.; Tkachenko, A. +4 more
The late B-type star V772 Cas (HD 10260) was previously suspected to be a rare example of a magnetic chemically peculiar star in an eclipsing binary system. Photometric observations of this star obtained by the TESS satellite show clear eclipses with a period of 5.0137 d accompanied by a significant out-of-eclipse variation with the same period. H…
A systematic study of photoionized emission and warm absorption signatures of the NLS1 Mrk 335
Liu, H.; Komossa, S.; Bambi, Cosimo +4 more
We present an analysis of all the archival high-resolution spectra of the narrow-line Seyfert 1 galaxy Mrk 335 obtained with Reflection Grating Spectrometer (RGS) onboard XMM-Newton. The spectra show rich emission and absorption features in low and intermediate flux intervals. We model the emission lines with the PION_XS grid and try to find any p…
Four 'Peculiar' RRd stars observed by K2
Nemec, James M.; Moskalik, Paweł
Four stars pulsating simultaneously with a dominant period PD ∈ (0.28, 0.39) d and an additional period PA ∈ (0.20, 0.27) d have been identified from among the more than 3000 RR Lyrae stars observed by the Kepler space telescope during NASA's K2 Mission. All four stars are located in the direction of the Galactic Bulge and ha…
A tale of two tails: insights from simulations into the formation of the peculiar dwarf galaxy NGC 1427A
Peletier, R. F.; Mastropietro, M.; De Rijcke, S.
We present a scenario for the formation and the morphology of the arrow-shaped dwarf irregular galaxy NGC 1427A in the Fornax Cluster. This galaxy shows intriguing stellar and gaseous tails pointing in different directions for which alternative but not conclusive formation scenarios have been proposed in the literature. We performed N-body/SPH sim…