Search Publications
Two evolved supernova remnants with newly identified Fe-rich cores in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +7 more
Aims: We present a multi-wavelength analysis of the evolved supernova remnants
Methods: We used observational data from XMM-Newton, the Australian Telescope Compact Array, and the Magellanic Cloud Emission Line Survey to study their…
Polarimetry of comets 67P/Churyumov-Gerasimenko, 74P/Smirnova-Chernykh, and 152P/Helin-Lawrence
Jones, G. H.; Muinonen, K.; Protopapa, S. +5 more
Aims: Polarimetric characteristics of comets at large heliocentric distances is a relatively unexplored area; we extend the idea by adding and analysing the data for three Jupiter family comets (JFCs).
Methods: With the FORS2 instrument of the ESO VLT, we performed quasi-simultaneous photometry and polarimetry of three active JFCs 67P/Ch…
GTC/CanariCam observations of (99942) Apophis
Alvarez, C.; Delbo, M.; Licandro, J. +2 more
Context. The potentially hazardous asteroid (PHA) (99942) Apophis is one of the most remarkable near-Earth asteroids (NEA) in terms of impact hazard. A good determination of its surface thermal inertia is very important in order to evaluate the Yarkovsky effect on its orbital evolution.
Aims: We present thermal infrared observations obtained …
Morphological classification of local luminous infrared galaxies
Le Floc'h, E.; Armus, L.; Charmandaris, V. +6 more
We present analysis of the morphological classification of 89 luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey (GOALS) sample, using non-parametric coefficients and compare their morphology as a function of wavelength. We rely on images that were obtained in the optical (B- and I-band) as well as in the infrared …
Evolutionary status of isolated B[e] stars
Liu, Sheng-Yuan; Chen, Wen-Ping; Lee, Chien-De
Aims: We study a sample of eight B[e] stars with uncertain evolutionary status to shed light on the origin of their circumstellar dust.
Methods: We performed a diagnostic analysis on the spectral energy distribution beyond infrared wavelengths, and conducted a census of neighboring region of each target to ascertain its evolutionary stat…
Herschel observations of the nebula M1-67 around the Wolf-Rayet star WR 124
Barlow, M. J.; Groenewegen, M. A. T.; Waelkens, C. +3 more
Infrared Herschel imaging and spectroscopic observations of the nebula M1-67 around the Wolf-Rayet star WR 124 have been obtained along with optical imaging observations. The infrared images reveal a clumpy dusty nebula that extends up to 1 pc. The comparison with the optical images shows that the ionized gas nebula coincides with the dust nebula,…
Tracing back the evolution of the candidate LBV HD 168625
Mahy, L.; Waelkens, C.; Royer, P. +1 more
Context. The luminous blue variable phase is a crucial transitory phase that is not clearly understood in the massive star evolution.
Aims: We have obtained far-infrared Herschel/PACS imaging and spectroscopic observations of the nebula surrounding the candidate LBV HD 168625. By combining these data with optical spectra of the central star, …
Compact planetary nebulae in the Galactic disk: Analysis of the central stars
Villaver, Eva; Shaw, Richard A.; Stanghellini, Letizia +1 more
Context. We have obtained multi-wavelength observations of compact Galactic planetary nebulae (PNe) to probe post-asymptotic giant branch (AGB) evolution from the onset of nebular ejection. Here we analyze new observations from HST to derive the masses and evolutionary status of their central stars (CSs).
Aims: Our objective here is to derive…
The Herschel Virgo Cluster Survey. XIX. Physical properties of low luminosity FIR sources at z < 0.5
Bizzocchi, Luca; De Looze, Ilse; Baes, Maarten +12 more
Context. The star formation rate is a crucial parameter for the investigation galaxy evolution. At low redshift the cosmic star formation rate density declines smoothly, and massive active galaxies become passive, reducing their star formation activity. This implies that the bulk of the star formation rate density at low redshift is mainly driven …
Solar-cycle variation of the rotational shear near the solar surface
Schou, J.; Gizon, L.; Barekat, A.
Context. Helioseismology has revealed that the angular velocity of the Sun increases with depth in the outermost 35 Mm of the Sun. Recently, we have shown that the logarithmic radial gradient (dlnΩ/dlnr) in the upper 10 Mm is close to -1 from the equator to 60° latitude.
Aims: We aim to measure the temporal variation of the rotational shear o…