Search Publications
Investigating the dynamical history of the interstellar object 'Oumuamua
Dybczyński, Piotr A.; Królikowska, Małgorzata
Here we try to find the origin of 1I/2017 U1 'Oumuamua, the first interstellar object recorded inside the solar system. To this aim, we searched for close encounters between 'Oumuamua and all nearby stars with known kinematic data during their past motion. We had checked over 200 thousand stars and found just a handful of candidates. If we limit o…
V1369 Cen High-resolution Panchromatic Late Nebular Spectra in the Context of a Unified Picture for Nova Ejecta
Izzo, Luca; Shore, Steven N.; Schwarz, Greg J. +3 more
Nova Cen 2013 (V1369 Cen) is the fourth bright nova observed panchromatically through high-resolution UV+optical multiepoch spectroscopy. It is also the nova with the richest set of spectra (in terms of both data quality and number of epochs) thanks to its exceptional brightness. Here, we use the late nebular spectra taken between day ∼250 and day…
Molecular clouds toward three Spitzer bubbles S116, S117, and S118: Evidence for a cloud-cloud collision which formed the three H II regions and a 10 pc scale molecular cavity
Tachihara, Kengo; Fukui, Yasuo; Nishimura, Atsushi +6 more
We carried out a molecular-line study toward the three Spitzer bubbles S116, S117, and S118, which show active formation of high-mass stars. We found molecular gas consisting of two components with a velocity difference of ∼5 km s-1. One of them, the small cloud, has a typical velocity of -63 km s-1 and the other, the large c…
Linking interstellar and cometary O2: a deep search for 16O18O in the solar-type protostar IRAS 16293-2422
Altwegg, K.; Codella, C.; Bieler, A. +15 more
Recent measurements carried out at comet 67P/Churyumov-Gerasimenko (67P) with the Rosetta probe revealed that molecular oxygen, O2, is the fourth most abundant molecule in comets. Models show that O2 is likely of primordial nature, coming from the interstellar cloud from which our solar system was formed. However, gaseous O
The fate of the Antennae galaxies
Naab, Thorsten; Johansson, Peter H.; Lahén, Natalia +2 more
We present a high-resolution smoothed particle hydrodynamic simulation of the Antennae galaxies (NGC 4038/4039) and follow the evolution 3 Gyr beyond the final coalescence. The simulation includes metallicity-dependent cooling, star formation, and both stellar feedback and chemical enrichment. The simulated best-match Antennae reproduce well both …
Investigating cluster astrophysics and cosmology with cross-correlation of the thermal Sunyaev-Zel'dovich effect and weak lensing
Nagai, Daisuke; Osato, Ken; Yoshida, Naoki +2 more
Recent detections of the cross-correlation of the thermal Sunyaev-Zel'dovich (tSZ) effect and weak gravitational lensing (WL) enable unique studies of cluster astrophysics and cosmology. In this work, we present constraints on the amplitude of the non-thermal pressure fraction in galaxy clusters, α0, and the amplitude of the matter powe…
Measurement of the pairwise kinematic Sunyaev-Zeldovich effect with Planck and BOSS data
Moodley, Kavilan; Ma, Yin-Zhe; Remazeilles, Mathieu +1 more
We present a new measurement of the kinetic Sunyaev-Zeldovich effect (kSZ) using Planck cosmic microwave background (CMB) and Baryon Oscillation Spectroscopic Survey (BOSS) data. Using the "LowZ North/South" galaxy catalogue from BOSS DR12, and the group catalogue from BOSS DR13, we evaluate the mean pairwise kSZ temperature associated with BOSS g…
A stratified ultrafast outflow in 1H0707-495?
Fabian, A. C.; Pinto, C.; Buisson, D. J. K. +3 more
Ultrafast outflows (UFOs) have recently been found in the spectra of a number of active galactic nuclei (AGN) and are strong candidates for driving AGN feedback. 1H0707-495 is a highly accreting narrow line Seyfert 1 and the second most X-ray variable bright AGN. Previous studies found evidence of blueshifted absorption at 0.1-0.2c in its spectrum…
Extended Structures of Planetary Nebulae Detected in H2 Emission
Zhang, Yong; Kwok, Sun; Guerrero, Martín A. +4 more
We present narrowband near-infrared images of a sample of 11 Galactic planetary nebulae (PNe) obtained in the H2 2.122 µm and Brγ 2.166 µm emission lines and the K c 2.218 µm continuum. These images were collected with the Wide-field Infrared Camera on the 3.6 m Canada-France-Hawaii Telescope (CFHT); their u…
The Dual Role of Starbursts and Active Galactic Nuclei in Driving Extreme Molecular Outflows
Bizzocchi, Luca; González-Alfonso, Eduardo; Darling, Jeremy +7 more
We report molecular gas observations of IRAS 20100-4156 and IRAS 03158+4227, two local ultraluminous infrared galaxies (ULIRGs) hosting some of the fastest and most massive molecular outflows known. Using Atacama Large Millimeter Array and Plateau de Bure Interferometer observations, we spatially resolve the CO (1-0) emission from the outflowing m…