arXiv subjects

Javier Méndez-Gallego

Publications and source records attributed to Javier Méndez-Gallego.

3 recordsLinked to original sources

arXiv2026

A radio view on Gamma-Loud Protostars: Derivation of jet mechanical luminosity

Context. Gamma-Loud Protostars (GLPs) have been recently reported as Galactic hadronic accelerators whose acceleration site is situated in their protostellar jets. Theoretical and observational analysis situate radio cm luminosity as a thermal tracer of jet activity, presenting an unique opportunity to study jet properties as accelerators. Aims. We aim to develop a way to estimate the kinetic power of protostellar jets and compare their energetics with those extracted from the non-thermal gamma-ray side of GLPs. Methods. We combine theoretical and phenomenological relations to estimate the jet mechanical luminosity based on the radio cm luminosity. We relate the resulting values to the non-thermal contribution of GLPs, studying its behaviour and efficiency. Results. The derivation of the jet power successfully reproduces infrared and radio observations. The cosmic-ray energy correlates to the injected mechanical energy, implying an acceleration efficiency of 1--10%. Future radio observations are needed to find the definite accelerators and obtain reliable efficiencies.

astro-ph.HE↗

arXiv2026

Evidence for protostellar jets as a population of hadronic gamma-ray sources

Stars are born in darkness, deep within cold, dense molecular clouds where gravity drives the collapse of gas and dust, giving rise to protostars, the earliest stages of stellar evolution. Once considered purely thermal sources, these young systems are now emerging as sites of energetic non-thermal activity. While radio synchrotron jets hinted at the presence of relativistic electrons, direct confirmation of proton acceleration remained elusive. Here we report a statistically significant detection of gamma rays from a population of young stellar objects, revealing a Galactic class of Gamma-Loud Protostars. Observations point towards particle acceleration within protostellar jets, where gamma-ray emission arises from protons interacting with surrounding molecular clouds via pion decay. We find a correlation between cosmic-ray output and bolometric luminosity, suggesting that particle acceleration scales with the system's mechanical power. These findings open a new observational window into the role of non-thermal processes in protostellar evolution and suggest that gamma-ray studies of protostars can provide critical insights into accretion, ejection, and feedback in star formation. This previously overlooked emission traces the energetic feedback that young stars inject into their surroundings, shaping the conditions for subsequent star and planet formation.

astro-ph.HE↗

arXiv2025

Cosmic Ray bubbles from nova super remnants and their contribution to local cosmic ray spectra

Context: Several new phenomena have been surrounding the area of study of the repeating thermonuclear explosions called novae. For example, recurrent novae have been proven to be efficient cosmic ray hadronic accelerators thanks to the recent observations of RS Ophiuchi by different gamma-ray instruments. Novae have also demonstrated to have the ability to carve large cavities into the Interstellar Medium with parallelisms with the remnants of supernovae. We aim at calculating what is the effect of novae in their surrounding media and to which distances these effects dominate over the average quantities that are measured in the ISM. We calculate the filling factor of novae and their contribution to cosmic ray fluxes using cosmic ray propagation codes. To limit what is the atomic density of the Interstellar Medium (ISM) surrounding the region around RS Oph, we use Fermi-LAT observations of the region. The filling factor of novae in the Galaxy is not significant under all assumptions done in the paper. They do not dominate over the local cosmic ray fluxes, even at the lowest energies, for distances larger than a few parsec. The particle density of the ISM surrounding them is, however, very much modified, lowering it more than one order of magnitude with respect to galactic averages, confirming estimates done using other observatories. As a conclusion, even though at global galactic distances, novae do not seem to be dominating cosmic ray transport, they have the power to modify the conditions of their surrounding ISM over parsec distances.

astro-ph.HE↗