The content of astrophysical jets

Romero, Gustavo E.

doi:10.1002/asna.202113989

Cited by 12 publications

(5 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Correlations have been detected, connecting F CO to the properties of the source (e.g., luminosity and mass) of the outflow for both protostellar (e.g., Bontemps et al 1996) and extragalactic (e.g., Lutz et al 2020) sources. The questions that naturally arise are, whether the physical mechanisms behind these two outflow types are the same (Romero 2021), whether outflows that vary in scale and energetics by many orders of magnitude can indeed be launched by the same physical processes, and how statistical methods can be used to compare and thereby infer similarities and differences between these types of outflows.…”

Section: Introductionmentioning

confidence: 99%

Connecting Galactic and extragalactic outflows: From the Cygnus-X cluster to active galaxies

Skretas¹,

Kristensen²

2022

A&A

View full text Add to dashboard Cite

Context. Molecular outflows are commonly detected originating from both protostellar and extragalactic sources. Separate studies of low-mass, isolated high-mass, and extragalactic sources reveal scaling relations connecting the force carried by an outflow and the properties of the source that drives it, as for example the mass and luminosity. Aims. The aim of this work is twofold: first, to examine the effects, if any, of clustered star formation on the protostellar outflows and their scaling relations and, second, to explore the possibility that outflows varying in scale and energetics by many orders of magnitude are consistent with being launched by the same physical processes. Methods. To that end, high-angular resolution CO J = 3–2 observations were used of ten high-mass protostars in the Cygnus-X molecular cloud, obtained at the SubMilliMeter Array as part of the Protostellar Interferometric Line Survey of Cygnus-X (PILS-Cygnus). From these data, the outflow force, that is the momentum ejection rate, was measured. In addition, an extended sample of protostellar and extragalactic outflow-force measurements was assembled from existing literature to allow for a direct comparison of the scaling relations of the two types of outflows. Results. Molecular outflows were detected originating from all ten sources of the PILS-Cygnus survey, and their outflow forces are found to be in close agreement with measurements from the literature. In addition, the comparison of the protostellar and extragalactic sources reveals, with 95% confidence, that Class 0 protostars and extragalactic sources follow the same outflow force–bolometric luminosity correlation. Conclusions. The close agreement between the Cygnus-X sources and sources of similar envelope mass and bolometric luminosity suggests that clustered star formation has no significant effect on protostellar outflows. We find a strong indication that protostellar and extragalactic outflows are consistent with having a similar launch mechanism. The existence of such a mechanism would enable the development of a single universal outflow launch model, although more observations are required in order to verify this connection.

show abstract

Section: Introductionmentioning

confidence: 99%

Connecting Galactic and extragalactic outflows: From the Cygnus-X cluster to active galaxies

Skretas¹,

Kristensen²

2022

A&A

View full text Add to dashboard Cite

show abstract

“…also ref. [73]. A possible caveat for the noted approach relates to the model requirement of a region significantly out of equipartition and characterized by a very low magnetic field.…”

Section: Pos(gamma2022)002mentioning

confidence: 99%

Theory of Gamma-Ray loud AGNs

Rieger¹

2023

Proceedings of 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy — PoS(Gamma2022)

View full text Add to dashboard Cite

The last decade has seen tremendous developments in gamma-ray astronomy with the extragalactic sky becoming highly populated by Active Galactic Nuclei (AGNs). This brief review highlights some of the progress in AGN research achieved over the years, and discusses exemplary advances in the theory and physics of gamma-ray loud AGNs, including black-hole magnetospheric processes, the physics of pc-scales jets, as well as particle acceleration and high-energy emission in the large-scale jets of AGNs.

show abstract

“…Electron-positron plasmas, also known as pair plasmas, are present in astrophysical jets (Kundt 1987;Romero 2021), gamma-ray bursts from AGNs (Zdziarski et al 1990;Henri & Pelletier 1991;Henri et al 1993), supernovas (Woosley & Janka 2005;Woosley et al 2007), and black hole accretion disks (Khiali & de Gouveia Dal Pino 2016). Studying fundamental processes (e.g., magnetic reconnection and turbulence) in pair plasmas is important to understand energizing mechanisms in astrophysical objects (Guo et al 2015;Pucci et al 2020) and in the nonrelativistic regime (Bessho & Bhattacharjee 2005Hesse & Zenitani 2007).…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Driving Turbulent-like Fluctuations on a Harris Current Sheet Configuration and the Formation of Plasmoids

Agudelo Rueda,

Liu,

Germaschewski

et al. 2024

ApJ

View full text Add to dashboard Cite

Energy dissipation in collisionless plasmas is one of the most outstanding open questions in plasma physics. Magnetic reconnection and turbulence are two phenomena that can produce the conditions for energy dissipation. These two phenomena are closely related to each other in a wide range of plasmas. Turbulent fluctuations can emerge in critical regions of reconnection events, and magnetic reconnection can occur as a product of the turbulent cascade. In this study, we perform 2D particle-in-cell simulations of a reconnecting Harris current sheet in the presence of turbulent fluctuations to explore the effect of turbulence on the reconnection process in collisionless nonrelativistic pair plasmas. We find that the presence of a turbulent field can affect the onset and evolution of magnetic reconnection. Moreover, we observe the existence of a scale-dependent amplitude of magnetic field fluctuations above which these fluctuations are able to disrupt the growing of magnetic islands. These fluctuations provide thermal energy to the particles within the current sheet and preferential perpendicular thermal energy to the background population.

show abstract

The content of astrophysical jets

Cited by 12 publications

References 75 publications

Connecting Galactic and extragalactic outflows: From the Cygnus-X cluster to active galaxies

Connecting Galactic and extragalactic outflows: From the Cygnus-X cluster to active galaxies

Theory of Gamma-Ray loud AGNs

On the Effect of Driving Turbulent-like Fluctuations on a Harris Current Sheet Configuration and the Formation of Plasmoids

Contact Info

Product

Resources

About