Search Publications
A departure from the mass-metallicity relation in merging galaxies due to an infall of metal-poor gas
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +2 more
Heavy element accumulation and stellar mass assembly are fundamental processes in the formation and evolution of galaxies. However, the key elements that govern them, such as gas accretion and outflow, are not fully understood. This is especially true for luminous and massive galaxies, which usually suffer strong feedback as massive outflows and l…
A magnetized Galactic halo from inner Galaxy outflows
Morris, Mark R.; Zhang, Yi; Carretti, Ettore +12 more
Magnetic halos of galaxies are crucial for understanding galaxy evolution, galactic-scale outflows and feedback from star formation activity. Identifying the magnetized halo of the Milky Way is challenging because of the potential contamination from foreground emission arising in local spiral arms. In addition, it is unclear how our magnetic halo …
Effects of density and temperature variations on the metallicity of Mrk 71
Kreckel, Kathryn; Esteban, César; García-Rojas, Jorge +2 more
In a very recent work, [1] claim that the scenario of temperature inhomogeneities proposed by [2] ($t2$ > 0) is not able to explain the O$^{2+}$/H$^{+}$ abundance discrepancy observed between the calculations based on the optical [OIII] collisional excited lines (CELs) and the OII recombination lines (RLs) in the star forming galaxy Mrk71. In t…
Spatially resolved imaging of the inner Fomalhaut disk using JWST/MIRI
Rieke, George H.; Gáspár, András; Beichman, Charles +9 more
Planetary debris disks around other stars are analogous to the asteroid and Kuiper belts in the Solar System. Their structure reveals the configuration of small bodies and provides hints for the presence of planets. The nearby star Fomalhaut hosts one of the most prominent debris disks, resolved by the Hubble Space Telescope, Spitzer, Herschel and…
Accurate oxygen abundance of interstellar gas in Mrk 71 from optical and infrared spectra
Weiner, Benjamin; Spilker, Justin; Fadda, Dario +9 more
The heavy element content (`metallicity') of the Universe is a record of the total star formation history. Gas-phase metallicity in galaxies, as well as its evolution with time, is of particular interest as a tracer of accretion and outflow processes. However, metallicities from the widely used electron temperature (Te) method are typic…
Low gas-phase metallicities of ultraluminous infrared galaxies are a result of dust obscuration
Chartab, Nima; Fadda, Dario; Herrera-Camus, Rodrigo +9 more
Optical spectroscopic measurements show that gas in dusty, starbursting galaxies known as ultraluminous infrared galaxies (ULIRGs) in the local Universe has a significantly lower metal content than that of gas in star-forming galaxies with similar masses. This low metal content has resulted in the claim that ULIRGs are primarily fuelled by metal-p…
A Solar System formation analogue in the Ophiuchus star-forming complex
Alves, João; Lin, Douglas N. C.; Forbes, John C.
Anomalies among the daughter nuclei of the extinct short-lived radionuclides in calcium-aluminium-rich inclusions indicate that the Solar System must have been born near a source of the short-lived radionuclides so that they could be incorporated before they decayed away1. γ-rays from one such living short-lived radionuclide, 26
The magnetic field across the molecular warped disk of Centaurus A
Lopez-Rodriguez, Enrique
Magnetic fields are amplified as a consequence of galaxy formation and turbulence-driven dynamos. Galaxy mergers can potentially amplify the magnetic fields from their progenitors, making the magnetic fields dynamically important. However, the effect of mergers on magnetic fields is still poorly understood. We use thermal polarized emission observ…
Optical reconstruction of dust in the region of supernova remnant RX J1713.7−3946 from astrometric data
Krone-Martins, A.; Rowell, G.; Fukui, Y. +5 more
The origin of the radiation observed in the region of the supernova remnant RX J1713.7−3946, one of the brightest TeV emitters, has been debated since its discovery. The existence of atomic and molecular clouds in this object supports the idea that part of the GeV gamma-ray emission in this region originates from proton-proton collisions. However,…
Ubiquitous velocity fluctuations throughout the molecular interstellar medium
Henning, Thomas; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +23 more
The density structure of the interstellar medium determines where stars form and release energy, momentum and heavy elements, driving galaxy evolution1-4. Density variations are seeded and amplified by gas motion, but the exact nature of this motion is unknown across spatial scales and galactic environments5. Although dense s…