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Kinematics of symmetric Galactic longitudes to probe the spiral arms of the Milky Way with Gaia
Prusti, T.; Antoja, T.; de Bruijne, J. +1 more
Aims: We model the effects of the spiral arms of the Milky Way on the disk stellar kinematics in the Gaia observable space. We also estimate the Gaia capabilities of detecting the predicted signatures.
Methods: We use both controlled orbital integrations in analytic potentials and self-consistent simulations. We introduce a new strategy …
Modelling the structure and kinematics of the Firework nebula: The nature of the GK Persei nova shell and its jet-like feature
Boumis, P.; Akras, S.; Harvey, E. +1 more
Aims: The shaping mechanisms of old nova remnants are probes for several important and unexplained processes, such as dust formation and the structure of evolved star nebulae. To gain a more complete understanding of the dynamics of the GK Per (1901) remnant, an examination of symmetry of the nova shell is explored, followed by a kinematical …
The SLUGGS survey*: exploring the globular cluster systems of the Leo II group and their global relationships
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +6 more
We present an investigation of the globular cluster (GC) systems of NGC 3607 and NGC 3608 as part of the ongoing SLUGGS (SAGES Legacy Unifying Globulars and GalaxieS) survey. We use wide-field imaging data from the Subaru telescope in the g, r and I filters to analyse the radial density, colour and azimuthal distributions of both GC systems. With …
Constraints on the Binary Companion to the SN Ic 1994I Progenitor
Van Dyk, Schuyler D.; de Mink, Selma E.; Zapartas, Emmanouil
Core-collapse supernovae (SNe), which mark the deaths of massive stars, are among the most powerful explosions in the universe and are responsible, e.g., for a predominant synthesis of chemical elements in their host galaxies. The majority of massive stars are thought to be born in close binary systems. To date, putative binary companions to the p…
ATCA observations of the MACS-Planck Radio Halo Cluster Project. I. New detection of a radio halo in PLCK G285.0-23.7
Brunetti, G.; Aghanim, N.; Douspis, M. +12 more
Aims: We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z = 0.39, M500 = 8.39 × 1014M⊙).
Methods: Our 16 cm-band ATCA observations of PLCK G285.0-23.7 allow us to reach a rms noise level of 11 µJy/beam on the wide-band (1.1…
Deep ALMA imaging of the merger NGC 1614. Is CO tracing a massive inflow of non-starforming gas?
Gallagher, J. S.; Xu, C. K.; Evans, A. +4 more
Aims: Observations of the molecular gas over scales of ~0.5 to several kpc provide crucial information on how molecular gas moves through galaxies, especially in mergers and interacting systems, where it ultimately reaches the galaxy center, accumulates, and feeds nuclear activity. Studying the processes involved in the gas transport is one o…
Compact Galactic Planetary Nebulae: An HST/WFC3 Morphological Catalog, and a Study of Their Role in the Galaxy
Villaver, Eva; Shaw, Richard A.; Stanghellini, Letizia
We present the images of a Hubble Space Telescope (HST/WFC3) snapshot program of angularly compact Galactic planetary nebulae (PNe), acquired with the aim of studying their size, evolutionary status, and morphology. PNe that are smaller than ∼4″ are underrepresented in most morphological studies, and today they are less well studied than their imm…
Galactic Centre hypershell model for the North Polar Spurs
Kataoka, J.; Matsui, H.; Nakashima, S. +5 more
The bipolar-hypershell (BHS) model for the North Polar Spurs (NPS-E, -W, and Loop I) and counter southern spurs (SPS-E and -W) is revisited based on numerical hydrodynamical simulations. Propagations of shock waves produced by energetic explosive events in the Galactic Centre are examined. Distributions of soft X-ray brightness on the sky at 0.25,…
Classifying the embedded young stellar population in Perseus and Taurus and the LOMASS database
van Dishoeck, E. F.; Mottram, J. C.; Jørgensen, J. K. +3 more
Context. The classification of young stellar objects (YSOs) is typically done using the infrared spectral slope or bolometric temperature, but either can result in contamination of samples. More accurate methods to determine the evolutionary stage of YSOs will improve the reliability of statistics for the embedded YSO population and provide more r…
Searching for intermediate-mass black holes in globular clusters with gravitational microlensing
Kains, N.; Bramich, D. M.; Sahu, K. C. +1 more
We discuss the potential of the gravitational microlensing method as a unique tool to detect unambiguous signals caused by intermediate-mass black holes in globular clusters. We select clusters near the line of sight to the Galactic bulge and the Small Magellanic Cloud, estimate the density of background stars for each of them, and carry out simul…