Search Publications
Abnormal oscillation modes in a waning light bridge
Walsh, Robert W.; Yuan, Ding
Context. A sunspot acts as a waveguide in response to the dynamics of the solar interior; the trapped waves and oscillations could reveal its thermal and magnetic structures.
Aims: We study the oscillations in a sunspot intruded by a light bridge, and the details of these oscillations could reveal the fine structure of the magnetic topology. …
The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
van Loon, J. Th.; Olofsson, H.; Sahai, R. +21 more
Context. Low- and intermediate-mass stars lose most of their stellar mass at the end of their lives on the asymptotic giant branch (AGB). Determining gas and dust mass-loss rates (MLRs) is important in quantifying the contribution of evolved stars to the enrichment of the interstellar medium.
Aims: This study attempts to spectrally resolve CO…
Carbon gas in SMC low-metallicity star-forming regions
Stutzki, J.; Zinnecker, H.; Okada, Y. +5 more
This paper presents [ CII ], [ CI ] and CO emission line maps of the star-forming regions N 66, N 25+N 26, and N 88 in the metal-poor Local Group dwarf galaxy SMC. The spatial and velocity structure of the large HII region N 66 reveals an expanding ring of shocked molecular gas centered on the exciting star cluster NGC 346, whereas a more distant …
Physical properties of CO-dark molecular gas traced by C+
Wang, Shen; Heiles, Carl; Li, Di +3 more
Context. Neither Hi nor CO emission can reveal a significant quantity of so-called dark gas in the interstellar medium (ISM). It is considered that CO-dark molecular gas (DMG), the molecular gas with no or weak CO emission, dominates dark gas. Determination of physical properties of DMG is critical for understanding ISM evolution. Previous studies…
Inner disk clearing around the Herbig Ae star HD 139614: Evidence for a planet-induced gap?
Thi, W. F.; Carmona, A.; Labadie, L. +8 more
Spatially resolving the inner dust cavity (or gap) of the so-called (pre-)transitional disks is a key to understanding the connection between the processes of planetary formation and disk dispersal. The disk around the Herbig star HD 139614 is of particular interest since it presents a pretransitional nature with an au-sized gap structure that is …
Planck intermediate results. XLV. Radio spectra of northern extragalactic radio sources
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +184 more
Continuum spectra covering centimetre to submillimetre wavelengths are presented for a northern sample of 104 extragalactic radio sources, mainly active galactic nuclei, based on four-epoch Planck data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous ground-based radio observations between 1.1 and 37 GHz.…
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 …
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…