HH 80-81: A Highly Collimated Herbig-Haro Complex Powered by a Massive Young Star

Martı́, Josep; Rodrı́guez, Luis F.; Reipurth, Bo

doi:10.1086/173227

Cited by 173 publications

(261 citation statements)

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“…On the other hand, the variation in the jet condensations is between 21 − 113%. All the radio condensations, other than S13 and HH80N, exhibit Marti, Rodriguez & Reipurth 1993) implies a lowering of values by factors between 2 − 3. We are of the view that variability has an important role to play in this decrease although the slightly variant beam sizes could also contribute to the difference.…”

Section: Hh Objects and Radio Condensationsmentioning

confidence: 96%

“…3 shows the images of the inner jet at earlier epochs: 610 MHz (2005) from GMRT as well as the 4860 and 1490 MHz observations taken with VLA in 1989 (Marti, Rodriguez & Reipurth 1993). The 4860 MHz image presented in the figure has been extracted from the VLA Archive as part of NRAO -VLA Archive Survey (date of observation: 18 Sept 1989, same as Marti et al 1993) while the 1490 MHz image has been provided by the Marti et al group. In the present work, we focus on the central exciting source, the inner jet condensations as well as the Herbig-Haro objects HH80, HH81, HH80N and Source 34 (referred to as S34 in the present work) .…”

Section: Hh Objects and Radio Condensationsmentioning

confidence: 99%

“…In the case of massive protostars, only a handful of radio jets have been detected (Rodríguez 2011;Purser et al 2016) as massive stars are rare, evolve faster, and typically lie at larger distances. All the earlier observations of massive protostellar radio jets have been at higher frequencies (> 1.4 GHz) with signatures of non-thermal emission discerned in few cases (Curiel et al 1993;Marti, Rodriguez & Reipurth 1993;Garay et al 1996;Wilner, Reid & Menten 1999;Rodríguez-Kamenetzky et al 2016;Purser et al 2016). While synchrotron emission from a protostellar jet has been detected conclusively solely in one case with the measurement of polarised emission (Carrasco-González et al 2010), the presence of non-thermal emission in other jet systems is usually deduced through the radio spectral indices.…”

Section: Introductionmentioning

confidence: 99%

“…The jet is highly energetic and the measured velocities of condensations lie in the range 600 − 1400 km s −1 (Marti, Rodriguez & Reipurth 1995;Heathcote, Reipurth & Raga 1998). The radio emission from the jet as well as the HH objects have been the targets of several studies (Rodríguez & Reipurth 1989;Marti, Rodriguez & Reipurth 1993;Masqué et al 2012). Marti, Rodriguez & Reipurth (1993) carried out a careful analysis of radio emission in this region using the VLA (20, 6, 3.6 and 2 cm) and find that the knots have spectral indices of −0.3 suggesting the non-thermal nature of emission.…”

Section: Introductionmentioning

confidence: 99%

“…The radio emission from the jet as well as the HH objects have been the targets of several studies (Rodríguez & Reipurth 1989;Marti, Rodriguez & Reipurth 1993;Masqué et al 2012). Marti, Rodriguez & Reipurth (1993) carried out a careful analysis of radio emission in this region using the VLA (20, 6, 3.6 and 2 cm) and find that the knots have spectral indices of −0.3 suggesting the non-thermal nature of emission. The jet comprises more than a dozen knots of radio emission with spacing of 1400 AU and widths of less than 500 AU.…”

Section: Introductionmentioning

confidence: 99%

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Detection of non-thermal emission from the massive protostellar jet HH80-81 at low radio frequencies using GMRT

Vig

Veena

Mandal

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Low radio frequencies are favourable for the identification of emission from non-thermal processes such as synchrotron emission. The massive protostellar jet associated with IRAS 18162-2048 (also known as the HH80-81 system) has been imaged at low radio frequencies: 325, 610 and 1300 MHz, using the Giant Metrewave Radio Telescope, India. This is the first instance of detection of non-thermal emission from a massive protostellar jet at such low radio frequencies. The central region displays an elongated structure characteristic of the jet. In addition, the associated Herbig-Haro objects such as HH80, HH81, HH80N, and other condensations along the inner regions of the jet exhibit negative spectral indices. The spectral indices of most condensations are ∼ −0.7, higher than the value of −0.3 determined earlier using high frequency measurements. The magnetic field values derived using radio flux densities in the present work, under the assumption of equipartition near minimum energy condition, lie in the range 116 − 180 µG. We probe into the hard X-ray nature of a source that has been attributed to HH80, in an attempt to reconcile the non-thermal characteristics of radio and X-ray measurements. The flux densities of condensations at 610 MHz, measured nearly 11 yrs apart, display variability that could be ascribed to the cooling of condensations, and emphasize the importance of coeval or nearly-coeval measurements for estimation of spectral indices.

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Section: Hh Objects and Radio Condensationsmentioning

confidence: 96%

Section: Hh Objects and Radio Condensationsmentioning

confidence: 99%