The star forming region Monoceros R2 as a gamma-ray source

Martı́, Josep; Luque-Escamilla, Pedro L.; Muñoz‐Arjonilla, A. J.; Sánchez-Ayaso, E.; Munar-Adrover, P.; Sánchez‐Sutil, J. R.; Romero, Gustavo E.; Paredes, J. M.; Combi, J. A.

doi:10.1051/0004-6361/201220791

Cited by 7 publications

(10 citation statements)

References 33 publications

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“…The possibility of a true association beyond apparent coincidence has been seriously proposed based on physical arguments [2,15], although a firm proof of it is not yet available. Nevertheless, one has still to be cautious even with the reality of the gammaray sources themselves.…”

Section: Search For New Kinds Of Gamma-ray Sources In Star Forming Rementioning

confidence: 99%

“…The in depth study of 2FGL J0607.5−0618c by [15] started by confirming the reality of the gamma-ray source by analyzing the whole Fermi-LAT data set available. As a result, the source detection was improved at the ∼ 12σ level as compared to the less significant detection in the 2FGL catalogue.…”

Section: The Monoceros R2 Casementioning

confidence: 99%

“…3). If the gammaray emission is not due to a collective effect of YSOs in the region, then one would be forced to assume an anomalous enhancement of the local cosmic ray energy by a factor of ∼ 7 [15]. No alternative background/foreground counterpart unrelated to Monoceros R2 appears obvious in multiwavelength data of the region.…”

Section: The Monoceros R2 Casementioning

confidence: 99%

“…The error ellipse of the Fermi-LAT source covers most of the field. The cross with a gap marks the conspicuous radio emission of the massive star forming region Monoceros R2 that has been tentatively associated with the gamma-ray source [15]. The bottom left box illustrates the NVSS circular restoring beam of 45 ′′ .…”

Section: The ρ-Ophiuchi Casementioning

confidence: 99%

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Search for new stellar sources of gamma-rays

Martı́

Sánchez-Ayaso

Luque-Escamilla

et al. 2013

EPJ Web of Conferences

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Abstract. We review and report about the present status of our search for gamma-ray binaries, microquasars, and new kinds of gamma-ray source associated with star forming regions in the Galaxy. The search is being carried out using cross-identification techniques applied to public databases and archives. A few promising candidates have been so far identified. These include the emission line star VES 737 and the central cluster of the Monoceros R2 star forming region. The observational data supporting the proposed associations is shortly presented and discussed.

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Section: Search For New Kinds Of Gamma-ray Sources In Star Forming Rementioning

confidence: 99%

Section: The Monoceros R2 Casementioning

confidence: 99%

Section: The Monoceros R2 Casementioning

confidence: 99%

Section: The ρ-Ophiuchi Casementioning

confidence: 99%

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Search for new stellar sources of gamma-rays

Martı́

Sánchez-Ayaso

Luque-Escamilla

et al. 2013

EPJ Web of Conferences

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“…Massive young stellar objects (MYSOs) have turned out to be a possible population of high-energy emitters (Araudo et al 2007;Romero 2008;Bosch-Ramon et al 2010), and several attempts to identify gamma-ray candidates have been carried out by various authors (Munar-Adrover et al 2011;Araudo & Rodríguez 2012;Martí et al 2013). It is still unclear how massive stars form, although it is clear that outflows, in particular jets of high speed and high kinetic power, are involved in the process (Garay & Lizano 1999;Reipurth & Bally 2001;Garay et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Studying the non-thermal lobes of IRAS 16547−4247 through a multi-wavelength approach

Munar-Adrover¹,

Bosch‐Ramon²,

Paredes³

et al. 2013

A&A

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In recent years, massive protostars have turned out to be a possible population of high-energy emitters. Among the best candidates is IRAS 16547-4247, a protostar that presents a powerful outflow with clear signatures of interaction with its environment. This source has been revealed to be a potential high-energy source because it displays non-thermal radio emission of synchrotron origin, which is evidence of relativistic particles. To improve our understanding of IRAS 16547-4247 as a high-energy source, we analyzed XMM-Newton archival data and found that IRAS 16547−4247 is a hard X-ray source. We discuss these results in the context of a refined one-zone model and previous radio observations. From our study we find that it may be difficult to explain the X-ray emission as non-thermal radiation coming from the interaction region, but it might be produced by thermal Bremsstrahlung (plus photo-electric absorption) by a fast shock at the jet end. In the high-energy range, the source might be detectable by the present generation of Cherenkov telescopes, and may eventually be detected by Fermi in the GeV range.

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Dynamics of cluster-forming hub-filament systems

Treviño-Morales

Fuente

Sánchez-Monge

et al. 2019

A&A

102

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Context High-mass stars and star clusters commonly form within hub-filament systems. Monoceros R2 (hereafter Mon R2), at a distance of 830 pc, harbors one of the closest such systems, making it an excellent target for case studies. Aims We investigate the morphology, stability and dynamical properties of the Mon R2 hub-filament system. Methods We employ observations of the 13CO and C18O 1→0 and 2→1 lines obtained with the IRAM-30m telescope. We also use H2 column density maps derived from Herschel dust emission observations. Results We identified the filamentary network in Mon R2 with the DisPerSE algorithm and characterized the individual filaments as either main (converging into the hub) or secondary (converging to a main filament) filaments. The main filaments have line masses of 30–100 M⊙ pc−1 and show signs of fragmentation, while the secondary filaments have line masses of 12–60 M⊙ pc−1 and show fragmentation only sporadically. In the context of Ostriker’s hydrostatic filament model, the main filaments are thermally supercritical. If non-thermal motions are included, most of them are trans-critical. Most of the secondary filaments are roughly transcritical regardless of whether non-thermal motions are included or not. From the morphology and kinematics of the main filaments, we estimate a mass accretion rate of 10−4–10−3 M⊙ yr−1 into the central hub. The secondary filaments accrete into the main filaments with a rate of 0.1–0.4×10−4 M⊙ yr−1. The main filaments extend into the central hub. Their velocity gradients increase towards the hub, suggesting acceleration of the gas.We estimate that with the observed infall velocity, the mass-doubling time of the hub is ~ 2:5 Myr, ten times larger than the free-fall time, suggesting a dynamically old region. These timescales are comparable with the chemical age of the Hii region. Inside the hub, the main filaments show a ring- or a spiral-like morphology that exhibits rotation and infall motions. One possible explanation for the morphology is that gas is falling into the central cluster following a spiral-like pattern.

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The star forming region Monoceros R2 as a gamma-ray source

Cited by 7 publications

References 33 publications

Search for new stellar sources of gamma-rays

Search for new stellar sources of gamma-rays

Studying the non-thermal lobes of IRAS 16547−4247 through a multi-wavelength approach

Dynamics of cluster-forming hub-filament systems

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