Search Publications
The effect of tides on the Sculptor dwarf spheroidal galaxy
Iorio, G.; Battaglia, G.; Sollima, A. +1 more
Dwarf spheroidal galaxies (dSphs) appear to be some of the most dark matter (DM)-dominated objects in the Universe. Their dynamical masses are commonly derived using the kinematics of stars under the assumption of equilibrium. However, these objects are satellites of massive galaxies (e.g. the Milky Way) and thus can be influenced by their tidal f…
The behaviour of chemical elements in 62 Am star candidates
Giarrusso, M.; Leone, F.; Busà, I. +3 more
In this paper, we present the results of a spectroscopic campaign devoted to ascertain the actual nature of a sample of 155 objects reported as uncertain peculiar stars in the General catalogue of Ap, Am, and HgMn stars. Spectroscopic observations have been obtained with Catania Astrophysical Observatory Spectropolarimeter. We derive for all the o…
Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049
Simionescu, A.; Gaspari, M.; Sun, M. +9 more
The relative importance of the physical processes shaping the thermodynamics of the hot gas permeating rotating, massive early-type galaxies is expected to be different from that in non-rotating systems. Here, we report the results of the analysis of XMM-Newton data for the massive, lenticular galaxy NGC 7049. The galaxy harbours a dusty disc of c…
The course of the Orphan Stream in the Northern Galactic hemisphere traced with Gaia DR2
van der Marel, Roeland P.; Fardal, Mark A.; Sohn, Sangmo Tony +1 more
The Orphan Stream is one of the most prominent tidal streams in the Galactic halo. Using data on red giants, RR Lyrae, and horizontal branch stars from Gaia and other surveys, we determine the proper motion of the Orphan Stream over a path of more than 90° on the sky. We also provide updated tracks for the sky position, distance, and radial veloci…
Weak lensing measurements of the APEX-SZ galaxy cluster sample
Israel, Holger; Klein, Matthias; Bertoldi, Frank +5 more
We present a weak lensing analysis for galaxy clusters from the APEX-SZ survey. For 39 massive galaxy clusters that were observed via the Sunyaev-Zel'dovich effect (SZE) with the APEX telescope, we analyse deep optical imaging data from WFI(@2.2mMPG/ESO) and Suprime-Cam(@SUBARU) in three bands. The masses obtained in this study, including an X-ray…
On the extraction of the power-law parts of probability density functions in star-forming clouds
Klessen, Ralf S.; Schneider, Nicola; Veltchev, Todor V. +5 more
We present a new approach to extract the power-law part of a density/column-density probability density function (ρ-pdf/N-pdf) in star-forming clouds. This approach is based on the mathematical method BPLFIT of Virkar & Clauset (2014, Annals of Applied Statistics, 8, 89) and it assesses the power-law part of an arbitrary distribution, without …
Powerful AGN jets and unbalanced cooling in the hot atmosphere of IC 4296
Mernier, F.; Fabian, A. C.; Sun, M. +13 more
We present new Karl G. Jansky Very Large Array (VLA, 1.5 GHz) radio data for the giant elliptical galaxy IC 4296, supported by archival radio, X-ray (Chandra, and XMM-Newton) and optical (SOAR, and HST) observations. The galaxy hosts powerful radio jets piercing through the inner hot X-ray emitting atmosphere, depositing most of the energy into th…
Searching for cool and cooling X-ray emitting gas in 45 galaxy clusters and groups
Fabian, Andrew C.; Sanders, Jeremy S.; Pinto, Ciro +2 more
We present a spectral analysis of cool and cooling gas in 45 cool-core clusters and groups of galaxies obtained from Reflection Grating Spectrometer (RGS) XMM-Newton observations. The high-resolution spectra show Fe XVII emission in many clusters, which implies the existence of cooling flows. The cooling rates are measured between the bulk intracl…
Searching for environmental effects on galaxy kinematics in groups and clusters at z ∼ 1 from the ORELSE survey
Shen, Lu; Kocevski, Dale D.; Tresse, Laurence +9 more
We present an investigation of the dependence of galaxy kinematics on the environment for a sample of 94 star-forming galaxies at z ∼ 0.9 from the ORELSE survey. ORELSE is a large photometric and spectroscopic campaign dedicated to mapping out and characterizing galaxy properties across a full range of environments in 15 fields containing large-sc…
Scaling relations for globular cluster systems in early-type galaxies
Bassino, Lilia P.; Caso, Juan P.; Ennis, Ana I. +1 more
The formation and growth of globular cluster systems (GCSs) is closely related to the evolutionary processes experienced by their host galaxies. In particular, their radial distributions scale with several properties of the galaxies and their haloes. We performed a photometric study, by means of HST/ACS archival data of several intermediate lumino…