Search Publications
The connection between star formation and supermassive black hole activity in the local Universe
Vignali, C.; Carrera, F.; Paolillo, M. +4 more
We study the nuclear (AGN) activity in the local Universe (z < 0.33) and its correlation with the host galaxy properties, derived from a Sloan Digital Sky Survey sample with spectroscopic star-formation rate (SFR) and stellar mass determination. To quantify the level of AGN activity we used the XMM-Newton Serendipitous Source Catalogue. Applyin…
Subaru/HSC deep optical imaging of infrared sources in the AKARI North Ecliptic Pole-Wide field
Momose, Rieko; Goto, Tomotsugu; Kim, Seong Jin +8 more
We present a five-broad-band (grizy) photometric catalogue of Subaru/Hyper Suprime-Cam (HSC) optical imaging observations at around the North Ecliptic Pole (NEP) where the AKARI infrared (IR) satellite conducted a large survey (NEP-Wide survey). The observations cover almost all the NEP-Wide survey field down to the depth of 28.1, 26.8, 26.3, 25.5…
A survey of CH2DOH towards starless and pre-stellar cores in the Taurus molecular cloud
Shirley, Yancy L.; Scibelli, Samantha; Ambrose, Hannah E.
Recent observations indicate that organic molecules are prevalent towards starless and pre-stellar cores. Deuteration of these molecules has not been well studied during the starless phase. Published observations of singly deuterated methanol, CH2DOH, have only been observed in a couple of well-studied, dense, and evolved pre-stellar co…
UOCS - VI. UVIT/AstroSat detection of low-mass white dwarf companions to four more blue stragglers in M67
Jadhav, Vikrant V.; Subramaniam, Annapurni; Pandey, Sindhu
Blue straggler stars (BSSs) in M67 have attracted attention from observations and theory to unravel their formation mechanisms. In the series of Ultra Violet Imaging Telescope (UVIT on AstroSat) study of Open clusters (UOCS), here we report the detection of hot companions to 4 more BSSs (WOCS 2013, WOCS 3013, WOCS 4006, and WOCS 5005), using Far-U…
A HARPS-N mass for the elusive Kepler-37d: a case study in disentangling stellar activity and planetary signals
Aigrain, S.; Poretti, E.; Sozzetti, A. +22 more
To date, only 18 exoplanets with radial velocity (RV) semi-amplitude <2 m s-1 have had their masses directly constrained. The biggest obstacle to RV detection of such exoplanets is variability intrinsic to stars themselves, e.g. nuisance signals arising from surface magnetic activity such as rotating spots and plages, which can drown…
The Gaia-ESO survey: a lithium depletion boundary age for NGC 2232
Gilmore, G.; Bayo, A.; Franciosini, E. +17 more
Astrometry and photometry from Gaia and spectroscopic data from the Gaia-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialized spectral line analysis procedure was used to recover the signature of undepleted lithium in very low luminosity cluster members. An age of 38 ± 3 Myr is inf…
Analysis of galaxy kinematics based on Cepheids from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.; Rastorguev, A. S. +1 more
To construct the rotation curve of the Galaxy, classical Cepheids with proper motions, parallaxes and line-of-sight velocities from the Gaia DR2 Catalogue are used in large part. Our working sample formed from literature data contains about 800 Cepheids with estimates of their age. We determined that the linear rotation velocity of the Galaxy at t…
Variable stars in Local Group galaxies - V. The fast and early evolution of the low-mass Eridanus II dSph galaxy
Zenteno, A.; Walker, A. R.; Salvadori, S. +18 more
We present a detailed study of the variable star population of Eridanus II (Eri II), an ultra-faint dwarf galaxy that lies close to the Milky Way virial radius. We analyse multi-epoch g, r, i ground-based data from Goodman and the Dark Energy Camera, plus F475W, F606W, F814W space data from the Advanced Camera for Surveys. We report the detection …
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy - I. HH 529 II and III
Henney, W. J.; Méndez-Delgado, J. E.; Arellano-Córdova, K. Z. +3 more
We present the analysis of physical conditions, chemical composition, and kinematic properties of two bow shocks - HH 529 II and HH 529 III - of the fully photoionized Herbig-Haro object HH 529 in the Orion Nebula. The data were obtained with the Ultraviolet and Visual Echelle Spectrograph at the 8.2m Very Large Telescope and 20 yr of Hubble Space…
Composite bulges - II. Classical bulges and nuclear discs in barred galaxies: the contrasting cases of NGC 4608 and NGC 4643
Beckman, John E.; Bender, Ralf; Drory, Niv +14 more
We present detailed morphological, photometric, and stellar-kinematic analyses of the central regions of two massive, early-type barred galaxies with nearly identical large-scale morphologies. Both have large, strong bars with prominent inner photometric excesses that we associate with boxy/peanut-shaped (B/P) bulges; the latter constitute ∼30 per…