Search Publications
Martian Ozone Observed by TGO/NOMAD-UVIS Solar Occultation: An Inter-Comparison of Three Retrieval Methods
Aoki, S.; Vandaele, A. C.; Daerden, F. +16 more
The NOMAD-UVIS instrument on board the ExoMars Trace Gas Orbiter has been investigating the Martian atmosphere with the occultation technique since April 2018. Here, we analyze almost two Mars Years of ozone vertical distributions acquired at the day-night terminator. The ozone retrievals proved more difficult than expected due to spurious detecti…
Spatially resolved properties of the ionized gas in the H II galaxy J084220+115000
Terlevich, E.; Terlevich, R.; Bresolin, F. +20 more
We present a spatially resolved spectroscopic study for the metal poor H II galaxy J084220+115000 using MEGARA Integral Field Unit observations at the Gran Telescopio Canarias. We estimated the gas metallicity using the direct method for oxygen, nitrogen, and helium and found a mean value of 12 + log (O/H) = 8.03 ± 0.06, and integrated electron de…
The redshift evolution of the S0 fraction for z < 1 in COSMOS
Bekki, Kenji; Groves, Brent A.; Cavanagh, Mitchell K.
Lenticular (S0) galaxies are galaxies that exhibit a bulge and disc component, yet lack any clear spiral features. With features considered intermediary between spirals and ellipticals, S0s have been proposed to be a transitional morphology, however their exact origin and nature is still debated. In this work, we study the redshift evolution of th…
Interactions between the Jet and Disk Wind in Nearby Radio-intermediate Quasar III Zw 2
An, Tao; Baan, Willem A.; Mohan, Prashanth +13 more
Disk winds and jets are ubiquitous in active galactic nuclei (AGN), and how these two components interact remains an open question. We study the radio properties of the radio-intermediate quasar III Zw 2. We detect two jet knots, J1 and J2, on parsec scales that move at a mildly apparent superluminal speed of 1.35c. Two γ-ray flares were detected …
MORPHOFIT: An automated galaxy structural parameters fitting package
Tortorelli, Luca; Mercurio, Amata
In today's modern wide-field galaxy surveys, there is the necessity for parametric surface brightness decomposition codes characterised by accuracy, small degree of user intervention, and high degree of parallelisation. We try to address this necessity by introducing \textsc{morphofit}, a highly parallelisable \textsc{python} package for the estim…
Testing the Collisionless Nature of Dark Matter with the Radial Acceleration Relation in Galaxy Clusters
Umetsu, Keiichi; Robertson, Andrew; Tam, Sut-Ieng +1 more
The radial acceleration relation (RAR) represents a tight empirical relation between the inferred total and baryonic centripetal accelerations, g tot = GM tot(< r)/r 2 and g bar = GM bar(< r)/r 2, observed in galaxies and galaxy clusters. The tight correlation between these tw…
Spectral Features of the Solar Transition Region and Chromospheric Lines at Flare Ribbons Observed with IRIS
Cheng, X.; Ding, M. D.; Li, Y. +2 more
We report on the spectral features of the Si IV λ1402.77, C II λ1334.53, and Mg II h or k lines, formed in the layers from the transition region to the chromosphere, in three two-ribbon flares (with X, M, and C class) observed with IRIS. All three lines show significant redshifts within the main flare ribbons, which mainly originate from the chrom…
JWST Imaging of the Cartwheel Galaxy Reveals Dust Associated with SN 2021afdx
Shivaei, Irene; Sand, David J.; Terreran, Giacomo +12 more
We present near- and mid-infrared (0.9-18 µm) photometry of supernova (SN) 2021afdx, which was imaged serendipitously with the James Webb Space Telescope (JWST) as part of its Early Release Observations of the Cartwheel Galaxy. Our ground-based optical observations show it is likely to be a Type IIb SN, the explosion of a yellow supergiant, …
Electromagnetic Characterization of the LISA Verification Binary ZTF J0526+5934
Bergeron, P.; Kupfer, Thomas; Kosakowski, Alekzander +1 more
We present an analysis of new and archival data to the 20.506 minute LISA verification binary J052610.42+593445.32 (J0526+5934). Our joint spectroscopic and photometric analysis finds that the binary contains an unseen M 1 = 0.89 ± 0.11 M ⊙ CO-core white dwarf primary with an M 2 = 0.38 ± 0.07 M ⊙ post-c…
Chasing ICM cooling and AGN feedback from the macro to the meso scales in the galaxy cluster ZwCl 235
Gitti, M.; Brighenti, F.; Ubertosi, F.
Aims: We aim to investigate the interplay between the intracluster medium (ICM) and the active galactic nucleus (AGN) in ZwCl 235, a galaxy cluster with high X-ray flux, an extended central radio galaxy, and evidence of multiphase gas at its center.
Methods: Using archival data from the Chandra telescope, the Very Large Array Sky Survey …