Search Publications
Multiwavelength campaign on the Super-Eddington NLS1 RX J0134.2-4258 - I. Peculiar X-ray spectra and variability
Done, Chris; Ward, Martin; Jin, Chichuan +3 more
We have conducted a new long-term multiwavelength campaign on one of the most super-Eddington narrow-line Seyfert 1s (NLS1s) known, namely RX J0134.2-4258. In this first paper, we report deep simultaneous X-ray observations performed by XMM-Newton and NuSTAR on 2019 December 19, during which RX J0134.2-4258 was fortuitously at one of its lowest X-…
Characteristics of chromospheric oscillation periods in magnetic bright points
Tavabi, Ehsan; Sadeghi, Rayhane
In this investigation, oscillation periods in Mg II k-line intensity, brightness temperature, and Doppler velocity obtained above magnetic bright points (MBPs) are investigated. For this purpose, data from the Interface Region Imaging Spectrometer (IRIS) observing the higher chromosphere and transition region (TR) were analysed, together with imag…
NGC 3147: a prototypical low-luminosity active galactic nucleus with double-peaked optical and ultraviolet lines
Laor, Ari; Bianchi, Stefano; Chiaberge, Marco +3 more
A previous narrow-slit (0.1 arcsec) Hubble Space Telescope observation unveiled a broad relativistic Hα profile in NGC 3147, a low-luminosity (Lbol ~ 1042 erg s-1), low-Eddington ratio (Lbol/LEdd ~ 10-4) active galactic nucleus (AGN), formerly believed to be a candidate true type 2 …
The nature of the radio source detected towards the exoplanet system 1RXS1609.1-210524
Narang, Mayank
Several studies have been carried out to detect radio emissions from known exoplanets. Some of these studies have resulted in tentative detections of radio sources near the position of known exoplanets. One such planet/brown dwarf around which a radio source was detected is 1RXS1609.1-210524 (hereafter 1RX) b. A radio source near 1RX was detected …
Implications from secondary emission from neutral impact on Cassini plasma and dust measurements
Edberg, N. J. T.; Vigren, E.; Eriksson, A. I. +4 more
We investigate the role of secondary electron and ion emission from impact of gas molecules on the Cassini Langmuir probe (RPWS-LP or LP) measurements in the ionosphere of Saturn. We add a model of the emission currents, based on laboratory measurements and data from comet 1P/Halley, to the equations used to derive plasma parameters from LP bias v…
On the peculiar long-term orbital evolution of the eclipsing accreting millisecond X-ray pulsar SWIFT J1749.4 - 2807
Altamirano, D.; Albayati, A. C.; Sanna, A. +16 more
We present the pulsar timing analysis of the accreting millisecond X-ray pulsar SWIFT J1749.4 - 2807 monitored by NICER and XMM-Newton during its latest outburst after almost 11 yr of quiescence. From the coherent timing analysis of the pulse profiles, we updated the orbital ephemerides of the system. Large phase jumps of the fundamental frequency…
SIRIUS Project - V. Formation of off-centre ionized bubbles associated with Orion Nebula Cluster
Shimajiri, Yoshito; Hattori, Kohei; Wang, Long +4 more
Massive stars born in star clusters terminate star cluster formation by ionizing the surrounding gas. This process is considered to be prevalent in young star clusters containing massive stars. The Orion Nebula is an excellent example associated with a forming star cluster including several massive stars (the Orion Nebula Cluster, ONC) and a 2-pc-…
Common envelope evolution in born-again planetary nebulae - Shaping the H-deficient ejecta of A 30
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +7 more
Born-again planetary nebulae (PNe) are extremely rare cases in the evolution of solar-like stars. It is commonly accepted that their central stars (CSPN) experienced a very late thermal pulse (VLTP), ejecting H-deficient material inside the evolved H-rich PN. Given the short duration of this event and the fast subsequent evolution of the CSPN, det…
FGC 1287 and its enigmatic 250 kpc long HI tail in the outskirts of Abell 1367
Finoguenov, A.; Cortese, L.; Scott, T. C. +3 more
We present H I and radio continuum, narrow-band Hα imaging, IFU spectroscopy, and X-ray observations of the FGC 1287 triplet projected ~1.8 Mpc west of the galaxy cluster Abell 1367. One triplet member, FGC 1287, displays an exceptionally long, 250 kpc H I tail and an unperturbed stellar disc which are the typical signatures of ram pressure stripp…
Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
Tissera, Patricia B.; Obreja, Aura; Ortega-Martinez, Sara +3 more
The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervis…