The distant young embedded stellar cluster CBJC 8 associated with G085.40-0.00

Persi, P.; Tapia, M.; Gómez, Mercedes

doi:10.1051/0004-6361/201014772

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…To our knowledge, a previously unknown ex-OH maser emission at 6035 MHz was detected for the first time by this present study toward a known methanol 6.7 GHz maser source with a distance of 5.5 kpc (Lumsden et al 2013) and young stellar cluster CBJC 8 (Persi et al 2011). The RCP component is more intense compared to the LCP component.…”

Section: 41+000supporting

confidence: 43%

New ex-OH maser detections in the northern celestial hemisphere

Patoka

Antyufeyev

Shmeld

et al. 2021

A&A

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Aims. Molecular masers, including methanol and hydroxyl masers, and in particular the ones in excited rotational states (ex-OH masers), are one of the most informative tools for studying star-forming regions. So, the discovery, of new maser sources in these regions is of great importance. Many studies and surveys of ex-OH maser sources have been carried out in the southern celestial hemisphere, but only a few have been done in the northern hemisphere. The specific aim of this work is to close this gap. Methods. The star-forming regions in the northern hemisphere with known active methanol masers were observed to search for new ex-OH maser sources with the 32 m and 16 m radio telescopes of the Ventspils International Radio Astronomy Centre (VIRAC). Results. Three OH maser lines in the excited state at the 6035 MHz in three northern hemisphere star-forming regions are detected. The maser 189.030+0.783 was previously known, but we suggest this maser is a possible variable. We confirm recent detections of the ex-OH masers 85.41+0.00 and 90.92+1.49 by other authors. The magnetic field strength in the masering regions is estimated by using right circular polarization and left circular polarization pair splitting. The high-velocity resolution provides us with an estimation of a comparatively small magnetic field strength for the 189.030+0.783 and 90.92+1.49 star-forming regions.

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Section: 41+000supporting

confidence: 43%

New ex-OH maser detections in the northern celestial hemisphere

Patoka

Antyufeyev

Shmeld

et al. 2021

A&A

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“…The 6035 MHz spectrum is markedly polarised (m C = 54%) and the peak velocity lies at the lowvelocity edge of the CH 3 OH and H 2 O maser spectra (Szymczak et al 2012;Urquhart et al 2011) very close to the systemic velocity of −35.8 km s −1 derived from NH 3 lines (Urquhart et al 2011). This new source is associated with an embedded stellar cluster of very young stars (Persi et al 2011) where the 6668 MHz maser coincides within 0. 3 with a compact HII region detected at centimetre wavelengths (Urquhart et al 2009;Hu et al 2016).…”

Section: Resultsmentioning

confidence: 56%

A search for the OH 6035 MHz line in high-mass star-forming regions

Szymczak

Wolak

Bartkiewicz

et al. 2020

A&A

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Context. The excited states of OH masers detected in the environment of high-mass young stellar objects (HMYSOs) are important for improving our understanding of the physical conditions of these objects and also provide information about their magnetic fields. Aims. We aim to search for excited-state OH 6035 MHz maser emission in HMYSOs which might have escaped detection in previous surveys or were never searched for. Methods. A sample of HMYSOs derived from untargeted surveys of the 6668 MHz methanol maser line was observed at 6035 MHz OH transition with the Torun 32 m radio telescope. The 6035 MHz detections were observed in the OH 6031 MHz line. Two-thirds of the detections were observed at least three times over a two-year period. Results. Out of 445 targets, 37 were detected at 6035 MHz, including seven new discoveries. The 6031 MHz line was detected towards ten 6035 MHz sources, one of which was not previously reported. All the newly detected sources are faint with the peak flux density lower than 4 Jy and show significant or high variability on timescales of 4 to 20 months. Zeeman pair candidates identified in three new sources imply a magnetic field intensity of 2–11 mG. Comparison of our spectra with those obtained ~10 yr ago indicates different degrees of variability but there is a general increase in the variability index on an ~25 yr timescale, usually accompanied by significant changes in the profile shape.

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“…To our knowledge, a previously unknown ex-OH maser emission at 6035 MHz was detected for the first time by this present study toward a known methanol 6.7 GHz maser source with a distance of 5.5 kpc (Lumsden 2013) and young stellar cluster CBJC 8 (Persi 2011). The RCP component is more intense compared to the LCP component.…”

Section: 41+000supporting

confidence: 44%

New ex-OH maser detections in the northern celestial hemisphere

Patoka,

Antyufeyev,

Shmeld

et al. 2021

Preprint

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Aims. Molecular masers, including methanol and hydroxyl masers, and in particular the ones in excited rotational states (ex-OH masers), are one of the most informative tools for studying star-forming regions. So, the discovery, of new maser sources in these regions is of great importance. Many studies and surveys of ex-OH maser sources have been carried out in the southern celestial hemisphere, but only a few have been done in the northern hemisphere. The specific aim of this work is to close this gap. Methods. The star-forming regions in the northern hemisphere with known active methanol masers were observed to search for new ex-OH maser sources with the 32 m and 16 m radio telescopes of the Ventspils International Radio Astronomy Centre (VIRAC). Results. Three OH maser lines in the excited state at the 6035 MHz in three northern hemisphere star-forming regions are detected. The maser 189.030+0.783 was previously known, but we suggest this maser is a possible variable. We confirm recent detections of the ex-OH masers 85.41+0.00 and 90.92+1.49 by other authors. The magnetic field strength in the masering regions is estimated by using right circular polarization (RCP) and left circular polarization (LCP) pair splitting. The high-velocity resolution provides us with an estimation of a comparatively small magnetic field strength for the 189.030+0.783 and 90.92+1.49 star-forming regions.

show abstract

The distant young embedded stellar cluster CBJC 8 associated with G085.40-0.00

Cited by 4 publications

References 26 publications

New ex-OH maser detections in the northern celestial hemisphere

New ex-OH maser detections in the northern celestial hemisphere

A search for the OH 6035 MHz line in high-mass star-forming regions

New ex-OH maser detections in the northern celestial hemisphere

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