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Timing of 29 Pulsars Discovered in the PALFA Survey
Camilo, F.; Ransom, S. M.; Chatterjee, S. +38 more
We report on the discovery and timing observations of 29 distant long-period pulsars found in the ongoing Arecibo L-band Feed Array pulsar survey. Following discovery with the Arecibo Telescope, confirmation and timing observations of these pulsars over several years at Jodrell Bank Observatory have yielded high-precision positions and measurement…
Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN
Callingham, J. R.; Heywood, I.; Soria, R. +22 more
Many radio galaxies show the presence of dense and dusty gas near the active nucleus. This can be traced by both 21 cm H I absorption and soft X-ray absorption, offering new insight into the physical nature of the circumnuclear medium of these distant galaxies. To better understand this relationship, we investigate soft X-ray absorption as an indi…
Where are the Binaries? Results of a Long-term Search for Radial Velocity Binaries in Proto-planetary Nebulae
Lu, Wenxian; Van Winckel, Hans; Hrivnak, Bruce J. +3 more
We present the results of an expanded, long-term radial velocity search (25 years) for evidence of binarity in a sample of seven bright proto-planetary nebulae (PPNe). The goal is to investigate the widely held view that the bipolar or point-symmetric shapes of planetary nebulae (PNe) and PPNe are due to binary interactions. Observations from thre…
HR-COSMOS: Kinematics of star-forming galaxies at z 0.9
Ilbert, O.; Scoville, N.; Zamorani, G. +5 more
We present the kinematic analysis of a sub-sample of 82 galaxies at 0.75 < z < 1.2 from our new survey HR-COSMOS aimed to obtain the first statistical sample to study the kinematics of star-forming galaxies in the treasury COSMOS field at 0 < z < 1.2. We observed 766 emission line galaxies using the multi-slit spectrograph ESO-VLT/VIMO…
Four-month chromospheric and coronal activity cycle in τ Boötis
Schmitt, J. H. M. M.; Robrade, J.; Schröder, K. -P. +3 more
We have used our robotic TIGRE facility to closely monitor the star τ Boo during the last three observing seasons 2013-2016 and to determine its S-index variability from the strength of its Ca II H and K line cores in order to study its characteristic cyclic chromospheric variations and determine its rotation period. We furthermore reanalyze archi…
Near-IR Transmission Spectrum of HAT-P-32b using HST/WFC3
Tsiaras, A.; Morello, G.; Damiano, M. +2 more
We report here the analysis of the near-infrared transit spectrum of the hot Jupiter HAT-P-32b, which was recorded with the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope. HAT-P-32b is one of the most inflated exoplanets discovered, making it an excellent candidate for transit spectroscopic measurements. To obtain the transit spect…
A novel star identification technique robust to high presence of false objects: The Multi-Poles Algorithm
Schiattarella, Vincenzo; Spiller, Dario; Curti, Fabio
This work proposes a novel technique for the star pattern recognition for the Lost in Space, named Multi-Poles Algorithm. This technique is especially designed to ensure a reliable identification of stars when there is a large number of false objects in the image, such as Single Event Upsets, hot pixels or other celestial bodies. The algorithm ide…
Probing the interstellar dust towards the Galactic Centre: dust-scattering halo around AX J1745.6-2901
Haberl, Frank; Jin, Chichuan; Ponti, Gabriele +1 more
AX J1745.6-2901 is an X-ray binary located at only 1.45 arcmin from Sgr A⋆, showcasing a strong X-ray dust-scattering halo. We combine Chandra and XMM-Newton observations to study the halo around this X-ray binary. Our study shows two major thick dust layers along the line of sight (LOS) towards AX J1745.6-2901. The LOS position and N
Excitation and evolution of vertically polarised transverse loop oscillations by coronal rain
Kohutova, P.; Verwichte, E.
Context. Coronal rain is composed of cool dense blobs that form in solar coronal loops and are a manifestation of catastrophic cooling linked to thermal instability. The nature and excitation of oscillations associated with coronal rain is not well understood.
Aims: We consider observations of coronal rain in a bid to elucidate the excitation…
Structure, Propagation, and Expansion of a CME-driven Shock in the Heliosphere: A Revisit of the 2012 July 23 Extreme Storm
Vourlidas, Angelos; Liu, Ying D.; Hu, Huidong +2 more
We examine the structure, propagation, and expansion of the shock associated with the 2012 July 23 extreme coronal mass ejection. Characteristics of the shock determined from multi-point imaging observations are compared to in situ measurements at different locations and a complex radio type II burst, which according to our definition has multiple…