Search Publications
Nuclear discs as clocks for the assembly history of early-type galaxies: the case of NGC 4458
Morelli, L.; Maraston, C.; Corsini, E. M. +6 more
Approximately 20 per cent of early-type galaxies host small nuclear stellar discs that are tens to a few hundred parsecs in size. Such discs are expected to be easily disrupted during major galactic encounters, hence their age serve to constrain their assembly history. We use VIsible MultiObject Spectrograph integral-field spectroscopic observatio…
Analysis of the dust jet imaged by Rosetta VIRTIS-M in the coma of comet 67P/Churyumov-Gerasimenko on 2015 April 12
Bieler, A.; Capaccioni, F.; Combi, M. R. +10 more
This work is a part of a more global effort aimed at understanding and interpreting in situ and remote sensing data acquired by instruments on board Rosetta. This study aims at deriving the dust mass source rate and the location of the dust jet source observed by Rosetta VIRTIS-M on 2015 April 12. The analysis is performed by means of the coupled …
Can we distinguish early dark energy from a cosmological constant?
Shi, Difu; Baugh, Carlton M.
Early dark energy (EDE) models are a class of quintessence dark energy with a dynamically evolving scalar field which display a small but non-negligible amount of dark energy at the epoch of matter-radiation equality. Compared with a cosmological constant, the presence of dark energy at early times changes the cosmic expansion history and conseque…
Diagnosing shock temperature with NH3 and H2O profiles
Codella, C.; Bachiller, R.; Fuente, A. +9 more
In a previous study of the L1157 B1 shocked cavity, a comparison between NH3(10-00) and H2O(110-101) transitions showed a striking difference in the profiles, with H2O emitting at definitely higher velocities. This behaviour was explained as a result of the high-temperatu…
A new approach to the infrared photometric study of Be stars
Chen, P. S.; Liu, J. Y.; Shan, H. G.
In this paper, we have collected data for almost all Be stars known so far (1991 sources in total) and photometrically study their infrared properties. 2MASS, WISE, IRAS and Akari data are analysed. It is shown from several two-colour diagrams that from 1 to 60 µm, infrared excesses for the majority of Be stars are mainly due to the free-fre…
Cross-correlation analysis of CMB with foregrounds for residuals
Rath, Pranati K.; Aluri, Pavan K.
In this paper, we try to probe whether a clean cosmic microwave background (CMB) map obtained from the raw satellite data using a cleaning procedure is sufficiently clean. Specifically, we study if there are any foreground residuals still present in the cleaned data using a cross-correlation statistic. Residual contamination is expected to be pres…
SZ/X-ray scaling relations using X-ray data and Planck Nominal maps
Atrio-Barandela, F.; De Martino, I.
We determine the relation between the Comptonization parameter predicted using X-ray data YC, Xray and the X-ray luminosity LX, both magnitudes derived from ROSAT data, with the Comptonization parameter YC, SZ measured on Planck 2013 foreground cleaned Nominal maps. The 560 clusters of our sample includes clusters …
Suzaku X-ray observation of the GK Persei dwarf nova outburst in 2015
Ishida, Manabu; Hayashi, Takayuki; Yuasa, Takayuki
The intermediate polar GK Per exhibited a dwarf nova outburst in 2015 March-April. Suzaku X-ray telescope serendipitously captured the onset of the outburst during its pre-scheduled pointing observation spanning four days. In this paper, we present temporal and spectral analysis results of this outburst, together with those from archival data of q…
Constraining the properties of transitional discs in Chamaeleon I with Herschel
Pinte, C.; Duchêne, G.; Bouy, H. +4 more
Transitional discs are protoplanetary discs with opacity gaps/cavities in their dust distribution, a feature that may be linked to planet formation. We perform Bayesian modelling of the three transitional discs SZ Cha, CS Cha, and T25 including photometry from the Herschel Space Observatory to quantify the improvements added by these new data. We …
A revised gyro-age for M67 from Kepler/K2-Campaign-5 light curves
Gonzalez, Guillermo
We revisit the photometric variability of stars in the M67 field using Kepler/K2-Campaign-5 light curves. In our previous work, we limited the search area around M67 to that of a recent ground-based study. In the present work, we expand the search area and apply a more rigorous period-finding algorithm to determine the rotation periods of 98 main-…