Search Publications
Accretion history of AGN: Estimating the host galaxy properties in X-ray luminous AGN from z = 0-3
Kirkpatrick, Allison; Marchesi, Stefano; LaMassa, Stephanie +10 more
We aim to determine the intrinsic far-Infrared (far-IR) emission of X-ray-luminous quasars over cosmic time. Using a 16 deg2 region of the Stripe 82 field surveyed by XMM-Newton and Herschel Space Observatory, we identify 2905 X-ray luminous (LX > 1042 erg/s) active galactic nuclei (AGN) in the range z ≈ 0-3. Th…
Multiple components in the molecular outflow of the red supergiant NML Cyg
De Beck, E.; Andrews, H.; Hirvonen, P.
Despite their large impact on stellar and galactic evolution, the properties of outflows from red supergiants are not well characterized. We used the Onsala 20m telescope to perform a spectral survey at 3 and 4 mm (68-116 GHz) of the red supergiant NML Cyg, alongside the yellow hypergiant IRC + 10420. Our observations of NML Cyg were combined with…
Distance and age of the massive stellar cluster Westerlund 1 - II. The eclipsing binary W36
Damineli, Augusto; Mace, Gregory N.; Navarete, Felipe +3 more
Westerlund 1 (Wd 1) is one of the most relevant star clusters in the Milky Way to study massive star formation, although it is still poorly known. Here, we used photometric and spectroscopic data to model the eclipsing binary W36, showing that its spectral type is O6.5 III + O9.5 IV, hotter and more luminous than thought before. Its distance d
First evidence of a stripped star cluster from the Small Magellanic Cloud
Piatti, Andrés E.; Lucchini, Scott
We present results on the recently discovered stellar system YMCA-1, for which physical nature and belonging to any of the Magellanic System galaxies have been irresolutely analysed. We used SMASH and Gaia Early Data Release 3 data sets to conclude that we are dealing with a small star cluster. Its reddening-free, field star decontaminated colour-…
The Smallest Scale of Hierarchy Survey (SSH) - II. Extended star formation and bar-like features in the dwarf galaxy NGC 3741: recent merger or ongoing gas accretion?
Bacchini, C.; Cignoni, M.; Tosi, M. +12 more
Using Large Binocular Telescope deep imaging data from the Smallest Scale of Hierarchy Survey (SSH) and archival Hubble Space Telescope data, we reveal the presence of two elongated stellar features contiguous to a bar-like stellar structure in the inner regions of the dwarf irregular galaxy NGC 3741. These structures are dominated by stars younge…
The XXL Survey. XLII. The LX - σv relation of galaxy groups and clusters detected in the XXL and GAMA surveys
Chiappetti, L.; Pierre, M.; Adami, C. +19 more
The XXL Survey is the largest homogeneous survey carried out with XMM-Newton. Covering an area of 50 deg2, the survey contains several hundred galaxy clusters out to a redshift of ≈2, above an X-ray flux limit of ~6 × 10-15 er g cm-2 s-1. The GAMA spectroscopic survey of ~300 000 galaxies covers ≈286 deg…
A study on the solar coronal dynamics during the post-maxima phase of the solar cycle 24 using S-band radio signals from the Indian Mars Orbiter Mission
Jain, Richa N.; Choudhary, R. K.; Bhardwaj, Anil +3 more
Radio signals from India's Mars Orbiter Mission (MOM) have been used to study turbulence in the solar plasma during the post-maximum phase of solar cycle 24. S-band (2.29 GHz) radio carrier downlink signals from MOM were received at the Indian Deep Space Network, Bangalore, and frequency residuals were spectrally analysed to obtain coronal turbule…
Establishing the accuracy of asteroseismic mass and radius estimates of giant stars - II. Revised stellar masses and radii for KIC 8430105
Grundahl, F.; Lund, M. N.; Miglio, A. +6 more
Asteroseismic scaling relations can provide high-precision measurements of mass and radius for red giant (RG) stars displaying solar-like oscillations. Their accuracy can be validated and potentially improved using independent and accurate observations of mass, radius, effective temperature and metallicity. We seek to achieve this using long perio…
58 open clusters investigated with UBVRI and Gaia eDR3 data
Dias, W. S.; Monteiro, H.; Lépine, J. R. D. +5 more
We present the results of the investigation of 58 open clusters using UBVRI CCD photometry (Johnsons-Cousins system) and Gaia eDR3 data. The membership probability of the stars in the cluster's field was determined from a maximum-likelihood method using Gaia eDR3 astrometric data. The fundamental parameters of the clusters were determined using a …
Spectroscopic study of five SB1 stars with CP components
Giarrusso, M.; Catanzaro, G.; Ferrara, C. +1 more
In this paper, we present the results of a spectroscopic campaign devoted to ascertaining the actual nature of a sample of five objects reported as chemically peculiar stars in the Catalogue of Ap, HgMn and Am stars (2009, A&A, 498, 961). Spectroscopic observations were obtained with Catania Astrophysical Observatory Spectropolarimeter. For ea…