Search Publications
Investigating dynamical properties of globular clusters through a family of lowered isothermal models
Jiang, Ing-Guey; Cheng, Chia-Hsuan
To investigate the dynamical properties of globular clusters, surface brightness and kinematic data were collected and fitted to a family of lowered isothermal models called LIMEPY models. For the 18 globular clusters studied, the amounts of concentration, truncation, and anisotropy were determined. In addition, the cluster mass, half-mass radius,…
Gaia DR3 and nearby galaxies: where do foregrounds matter?
Barmby, P.
Nearby galaxies provide populations of stellar and non-stellar sources at a common distance and in quantifiable environments. All are observed through the Milky Way foreground, with varying degrees of contamination that depend on observed Galactic latitude and the distance and size of the target galaxy. This work uses Gaia Data Release 3 (DR3) to …
A closer look at NGC 7314 nuclear region: a multiwavelength analysis of the Seyfert nucleus and its surroundings
Arévalo, P.; López-Navas, E.; Menezes, R. B. +4 more
The central regions of galaxies harbouring active galactic nuclei (AGNs) can be quite complex, especially at high activity, presenting, besides variability, a variety of phenomena related, e.g. to ionization/excitation mechanisms. A detailed study is necessary in order to understand better those objects. For that reason, we performed a multiwavele…
The shocked molecular layer in RCW 120
Kirsanova, M. S.; Olofsson, A. O. H.; Semenov, D. A. +2 more
Expansion of wind-blown bubbles or H II regions lead to formation of shocks in the interstellar medium, which compress surrounding gas into dense layers. We made spatially and velocity-resolved observations of the RCW 120 photo-dissociation region (PDR) and nearby molecular gas with CO(6-5) and 13CO(6-5) lines and distinguished a bright…
J-PLUS: characterization of high-velocity stars in the second data release
Hernández-Monteagudo, C.; Pereira, C. B.; Placco, V. M. +18 more
High-velocity stars in the Milky Way are related to extreme astrophysical phenomena. In this work, we characterize 28 stars with Galactocentric velocities higher than 400 $\mathrm{km\, s^{-1}}$ observed in the Javalambre Photometric Local Universe Survey Data Release 2 (J-PLUS DR2) survey. We combine J-PLUS photometry with astrometric data from th…
Carbonates and ices in the z = 0.89 galaxy-absorber towards PKS 1830-211 and within star-forming regions of the Milky Way
Bowey, Janet E.
A pair of 6.0 and 6.9 µm absorption features are frequently observed in Milky Way (MW) molecular-clouds and YSOs; they also occur in the z = 0.886 rest-frame of a molecule-rich spiral galaxy obscuring blazar PKS 1830-211. I calibrate χ2-fitting methods, which match observations with two or three laboratory spectra. The 6.0-µ…
A correlation between accreted stellar kinematics and dark-matter halo spin in the ARTEMIS simulations
Belokurov, Vasily; Evans, N. Wyn; Dillamore, Adam M. +1 more
We report a correlation between the presence of a Gaia-Sausage-Enceladus (GSE) analogue and dark-matter (DM) halo spin in the ARTEMIS simulations of Milky Way-like galaxies. The haloes which contain a large population of accreted stars on highly radial orbits (like the GSE) have lower spin on average than their counterparts with more isotropic ste…
The period bouncer system SDSS J105754.25+275947.5: first radial velocity study
Zharikov, S.; Echevarría, J.; Mora Zamora, I.
We report the first radial velocity spectroscopic study of the eclipsing period bouncer SDSS J105754.25+275947.5. Together with eclipse light-curve modelling, we re-determined the system parameters and studied the accretion disc structure. We confirm that the system contains a white dwarf with MWD = 0.83(3) M⊙ and an effectiv…
Physical properties of circumnuclear ionizing clusters - I. NGC 7742
Zamora, S.; Díaz, Ángeles I.
This work aims to derive the physical properties of the circumnuclear star-forming region in the ring of the face-on spiral NGC 7742 using integral field spectroscopy observations. We have selected 88 individual ionizing clusters that power H II regions populating the ring of the galaxy that may have originated in a minor-merger event. For the H I…
DMPP-3: confirmation of short-period S-type planet(s) in a compact eccentric binary star system, and warnings about long-period RV planet detections
Barstow, Joanna K.; Stevenson, Adam T.; Haswell, Carole A. +2 more
We present additional HARPS radial velocity observations of the highly eccentric (e ~ 0.6) binary system DMPP-3AB, which comprises a K0V primary and a low-mass companion at the hydrogen burning limit. The binary has a 507 d orbital period and a 1.2 au semimajor axis. The primary component harbours a known 2.2 M⊕ planet, DMPP-3A b, with …