Search Publications
Revisiting the mass of open clusters with Gaia data
Monteiro, Hektor; Dias, Wilton S.; Almeida, Anderson
The publication of the Gaia catalogue and improvements in methods to determine memberships and fundamental parameters of open clusters has led to major advances in recent years. However, important parameters such as the masses of these objects, although being studied mostly in some isolated cases, have not been addressed in large homogeneous sampl…
The Pristine Inner Galaxy Survey (PIGS) - V. A chemo-dynamical investigation of the early assembly of the Milky Way with the most metal-poor stars in the bulge
Sestito, Federico; Navarro, Julio F.; Martin, Nicolas F. +13 more
The investigation of the metal-poor tail in the Galactic bulge provides unique information on the early Milky Way assembly and evolution. A chemo-dynamical analysis of 17 very metal-poor stars (VMP, [Fe/H]<-2.0) selected from the Pristine Inner Galaxy Survey was carried out based on Gemini/GRACES spectra. The chemistry suggests that the majorit…
Broad-line region in NGC 4151 monitored by two decades of reverberation mapping campaigns - I. Evolution of structure and kinematics
Dale, D. A.; Brotherton, Michael S.; Maithil, Jaya +33 more
We report the results of long-term reverberation mapping campaigns of the nearby active galactic nuclei (AGNs) NGC 4151, spanning from 1994 to 2022, based on archived observations of the FAST Spectrograph Publicly Archived Programs and our new observations with the 2.3 m telescope at the Wyoming Infrared Observatory. We reduce and calibrate all th…
The TIME Table: rotation and ages of cool exoplanet host stars
Gaidos, Eric; Claytor, Zachary; Dungee, Ryan +2 more
Age is a stellar parameter that is both fundamental and difficult to determine. Among middle-aged M dwarfs, the most prolific hosts of close-in and detectable exoplanets, gyrochronology is the most promising method to assign ages, but requires calibration by rotation-temperature sequences (gyrochrones) in clusters of known ages. We curated a catal…
The effects of stellar rotation along the main sequence of the 100-Myr-old massive cluster NGC 1850
Cabrera-Ziri, I.; Usher, C.; Bastian, N. +13 more
Young star clusters enable us to study the effects of stellar rotation on an ensemble of stars of the same age and across a wide range in stellar mass and are therefore ideal targets for understanding the consequences of rotation on stellar evolution. We combine MUSE spectroscopy with HST photometry to measure the projected rotational velocities (…
The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources
Dhillon, V. S.; Calore, F.; Possenti, A. +35 more
More than 100 millisecond pulsars (MSPs) have been discovered in radio observations of gamma-ray sources detected by the Fermi Large Area Telescope (LAT), but hundreds of pulsar-like sources remain unidentified. Here, we present the first results from the targeted survey of Fermi-LAT sources being performed by the Transients and Pulsars with MeerK…
Vertical motion in the Galactic disc: unwinding the snail
Bovy, Jo; Hogg, David W.; Tremaine, Scott +1 more
The distribution of stars in the Milky Way disc shows a spiral structure - the snail - in the space of velocity and position normal to the Galactic mid-plane. The snail appears as straight lines in the vertical frequency-vertical phase plane when effects from sample selection are removed. Their slope has the dimension of inverse time, with the sim…
Spectral shapes of the Ly α emission from galaxies - II. The influence of stellar properties and nebular conditions on the emergent Ly α profiles
Scarlata, Claudia; Rivera-Thorsen, T. Emil; Gronke, Max +2 more
We demonstrate how the stellar and nebular conditions in star-forming galaxies modulate the emission and spectral profile of H I Ly α emission line. We examine the net Ly α output, kinematics, and in particular emission of blueshifted Ly α radiation, using spectroscopy from with the Cosmic Origins Spectrograph on Hubble Space Telescope (HST), givi…
The Cosmic Ultraviolet Baryon Survey (CUBS) - VI. Connecting physical properties of the cool circumgalactic medium to galaxies at z ≈ 1
Faucher-Giguère, Claude-André; Johnson, Sean D.; Zahedy, Fakhri S. +12 more
This paper presents a newly established sample of 19 unique galaxies and galaxy groups at redshift z = 0.89-1.21 in six QSO fields from the Cosmic Ultraviolet Baryon Survey (CUBS), designated as the CUBSz1 sample. In this sample, nine galaxies or galaxy groups show absorption features, while the other 10 systems exhibit 2σ upper limits of $\log N …
A Gaia view of the optical and X-ray luminosities of compact binary millisecond pulsars
Linares, Manuel; Koljonen, Karri I. I.
In this paper, we study compact binary millisecond pulsars with low- and very low-mass companion stars (spiders) in the Galactic field, using data from the latest Gaia data release (DR3). We infer the parallax distances of the optical counterparts to spiders, which we use to estimate optical and X-ray luminosities. We compare the parallax distance…