Particle acceleration in the Herbig–Haro objects HH 80 and HH 81

Rodríguez-Kamenetzky, Adriana; Carrasco-González, Carlos; González‐Martín, O.; Araudo, Anabella T.; Rodrı́guez, Luis F.; Vig, S.; Höfner, P.

doi:10.1093/mnras/sty3055

Cited by 21 publications

(14 citation statements)

References 39 publications

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“…3) suggests that they are not protostars, further supporting our shock-excited gas interpretation for these sources. This kind of obscured HH objects, exhibiting proper motions higher than 100 km s −1 , have also been observed in radio continuum in other intermediate-and high-mass star-forming regions: e.g., Serpens (Curiel et al 1993;Rodríguez-Kamenetzky et al 2016), GGD 27 (Martí et al 1995(Martí et al , 1998Masqué et al 2015;Rodríguez-Kamenetzky et al 2019), Cepheus A (Curiel et al 2006).…”

Section: Bc and Vlamentioning

confidence: 57%

“…Herbig-Haro (HH) object, possibly excited by the VLA 3 jet. A flattened structure similar to that of Bc is also seen in the frontal region of the shock of the obscured HH 80N object (Rodríguez-Kamenetzky et al 2019). Carrasco-González et al (2010) studied the kinematics of these sources by computing proper motions relative to VLA 3 in three epochs (1992.90, 1998.23, and 2006.38) spanning 13.48 years.…”

Section: Bc and Vlamentioning

confidence: 99%

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Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)

Rodríguez-Kamenetzky

Carrasco-González²,

Torrelles

et al. 2020

Monthly Notices of the Royal Astronomical Society

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ABSTRACT The massive star-forming region W75N (B) is thought to host a cluster of massive protostars (VLA 1, VLA 2, and VLA 3) undergoing different evolutionary stages. In this work, we present radio continuum data with the highest sensitivity and angular resolution obtained to date in this region, using the VLA-A and covering a wide range of frequencies (4–48 GHz), which allowed us to study the morphology and the nature of the emission of the different radio continuum sources. We also performed complementary studies with multi-epoch Very Large Array (VLA) data and Atacama Large Millimeter Array (ALMA) archive data at 1.3 mm wavelength. We find that VLA 1 is driving a thermal radio jet at scales of ≈0.1 arcsec (≈130 au), but also shows signs of an incipient hypercompact H ii region at scales of ≲1 arcsec (≲1300 au). VLA 3 is also driving a thermal radio jet at scales of a few tenths of arcsec (few hundred of au). We conclude that this jet is shock exciting the radio continuum sources Bc and VLA 4 (obscured Herbig–Haro objects), which show proper motions moving outward from VLA 3 at velocities of ≈112–118 km s−1. We have also detected three new weak radio continuum sources, two of them associated with millimetre continuum cores observed with ALMA, suggesting that these two sources are also embedded young stellar objects in this massive star-forming region.

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Section: Bc and Vlamentioning

confidence: 57%

Section: Bc and Vlamentioning

confidence: 99%

Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)

Rodríguez-Kamenetzky

Carrasco-González²,

Torrelles

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Moreover, the jet has been observed to be linearly polarized, a clear signature of synchrotron emission (Carrasco-González et al, 2010). Soft X-ray thermal emission has been observed ahead of the non-thermal radio peak (Rodríguez-Kamenetzky et al, 2019) suggesting a forward shock that heats gas up to 10 6 K and a reverse shock (Mach disk) where the relativistic particles are likely to be accelerated. Other cases of non-thermal emission have been found (e.g., Ainsworth et al, 2014) in outflows from solar-like young stars where the velocity of the outflow is considerably lower than the 1,000 kms −1 reached in HH80/81.…”

Section: What Radio Emission From Outflows Has To Tell Usmentioning

confidence: 99%

Jets from Young Stars

Ray,

Ferreira

2020

Preprint

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Jets are ubiquitous in the Universe and, as demonstrated by this volume, are seen from a large number of astrophysical objects including active galactic nuclei, gamma ray bursters, micro-quasars, proto-planetary nebulae, young stars and even brown dwarfs. In every case they seem to be accompanied by an accretion disk and, while the detailed physics may change, it has been suggested that the same basic mechanism is responsible for generating the jet. Although we do not understand what that mechanism is, or even if it is universal, it is thought to involve the centrifugal ejection of matter from the disk along magnetic field lines. For a number of reasons, in particular their proximity and the abundant range of diagnostics to determine their characteristics, jets from young stars and their associated outflows may offer us the best opportunity to discover how jets are generated and the nature of the link between outflows and their accretion disks. Recently it has become clear that jets may be fundamental to the star formation process in removing angular momentum from the surrounding protoplanetary disk thereby allowing accretion to proceed. Moreover, with the realisation that planetary formation begins much earlier than previously thought, jets may also help forge planets by determining initial environmental characteristics. This seems to be particularly true within the so-called terrestrial planet forming zone. Here we review observations of jets from young stars which have greatly benefitted from new facilities such as ALMA, space observatories * To appear in the New Astronomy Reviews special volume 100 Years of Jets (eds. Rob Fender and Ralph Wijers)

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“…Recently, other types of stellar sources have been proposed as possible gamma-ray emitters, and different scenarios were analyzed. In addition to the well-studied microquasars (Romero et al 2003), colliding-wind binaries (Benaglia & Romero 2003), Herbig Haro objects, young stellar objects (YSO), (Bosch-Ramon et al 2010;Araudo et al 2007;Rodríguez-Kamenetzky et al 2019), A&A 642, A136 (2020) and stellar bow shocks (Benaglia et al 2010;del Valle & Pohl 2018;del Palacio et al 2018) are capable of producing gammarays. A signature of high-energy emission is nonthermal radio emission because particles from the same population are likely to be involved in processes at both energy ranges, at the radio through synchrotron process, and at VHE emission through inverse-Compton scattering.…”

Section: Introductionmentioning

confidence: 99%

Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog

Benaglia

Ishwara‐Chandra

Intema

et al. 2020

A&A

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Context. Observations at the radio continuum band below the gigahertz band are key when the nature and properties of nonthermal sources are investigated because their radio radiation is strongest at these frequencies. The low radio frequency range is therefore the best to spot possible counterparts to very high-energy (VHE) sources: relativistic particles of the same population are likely to be involved in radio and high-energy radiation processes. Some of these counterparts to VHE sources can be stellar sources. Aims. The Cygnus region in the northern sky is one of the richest in this type of sources that are potential counterparts to VHE sources. We surveyed the central ∼15 sq deg of the Cygnus constellation at the 325 and 610 MHz bands with angular resolutions and sensitivities of 10″ and 6″, and 0.5 and 0.2 mJy beam−1, respectively. Methods. The data were collected during 172 h in 2013–2017, using the Giant Metrewave Radio Telescope with 32 MHz bandwidth, and were calibrated using the SPAM routines. The source extraction was carried out with the PyBDSF tool, followed by verification through visual inspection of every putative catalog candidate source in order to determine its reliability. Results. In this first paper we present the catalog of sources, consisting of 1048 sources at 325 MHz and 2796 sources at 610 MHz. By cross-matching the sources from both frequencies with the objects of the SIMBAD database, we found possible counterparts for 143 of them. Most of the sources from the 325-MHz catalog (993) were detected at the 610 MHz band, and their spectral index α was computed adopting S(ν) ∝ να. The maximum of the spectral index distribution is at α = −1, which is characteristic of nonthermal emitters and might indicate an extragalactic population.

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Particle acceleration in the Herbig–Haro objects HH 80 and HH 81

Cited by 21 publications

References 39 publications

Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)

Characterizing the radio continuum nature of sources in the massive star-forming region W75N (B)

Jets from Young Stars

Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog

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