The abundance discrepancy problem refers to the systematic differences observed between chemical abundances derived from collisionally excited lines (CELs) and recombination lines (RLs) of heavy ions. It remains a major unsolved problem in the study of ionized nebulae and is quantified by the abundance discrepancy factor (ADF). In this work, we

Observations of density variations in stellar streams are a promising probe of low-mass dark matter substructure in the Milky Way. However, survey systematics such as variations in seeing and sky brightness can also induce artificial fluctuations in the observed densities of known stellar streams. These variations arise because survey conditions

Context. One of the most difficult and unexplored regions of the Milky Way is the highly extincted in-plane central region within the Galactic coordinates 10 ◦ ≲ |ℓ| ≲ 30 ◦, |b| ≲ 3 ◦, where we have the long-bar and 3 kpc arm with intermediate-age stellar population, whose morphological properties are still unclear. Aims. We aim to advance our

We present near- and mid-infrared spectra of eight low-luminosity active galactic nuclei (LLAGN), spanning nearly 4 orders of magnitude in black hole mass and Eddington ratio, obtained with JWST/NIRSpec and MIRI as part of the ReveaLLAGN program, along with identical archival data of Cen A. The high spatial resolution of JWST cleanly separates

Context. Polarization measurements in the 30─40 GHz range are essential to improving our understanding of Galactic synchrotron radiation and potential anomalous microwave emissions, and obtaining such measurements will ultimately aid in detecting primordial B modes. To achieve this aim, it is crucial to achieve unprecedented performance in

We present long-slit near-infrared spectroscopic observations of six nearby (z ∼ 0.1) radio-quiet type-2 quasars (QSO2s) from the Quasar Feedback (QSOFEED) sample. The QSO2s have bolometric luminosities of 10 45 − 46 erg s −1 and stellar masses of 10 10.6−11.3 M ⊙. The observations were obtained with the instrument Espectrógrafo Multiobjeto Infra