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Browsing Artykuły (WFAIS) by Subject "masers"

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Browsing Artykuły (WFAIS) by Subject "masers"

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  • Olech, Mateusz; Szymczak, Marian; Wolak, Paweł; Sarniak, Rafał; Bartkiewicz, Anna (Monthly Notices of the Royal Astronomical Society, 2019-04-01)
    Discovery of periodic maser emission was an unexpected result from monitoring observations of methanol transitions in high-mass young stellar objects. We report on the detection of five new periodic sources from a monitoring ...
  • Volvach, L. N.; Volvach, A. E.; Larinov, M. G.; MacLeod, G. C.; van den Heever, S. P.; Wolak, P; Olech, Mateusz; Ipanov, A. V.; Ivanov, D. V.; Mikhailov, A.G.; Melnikov, A.E.; Menten, K.; Belloche, A.; Weiss, A.; Mazumdar, P.; Schuller, F. (Astronomy Reports, 2019-01-01)
    The results of long-term monitoring of the Galactic maser source IRAS 18316-0602 (G25.65+1.05) in the water-vapor line at frequency f = 22.235 GHz (6_16-5_23 transitioin) carried out on the 22-m Simeiz, 26-m HartRAO, and ...
  • Szymczak, Marian; Wolak, Paweł; Bartkiewicz, Anna; Aramowicz, Mirosława; Durjasz, Michał (EDP Sciences, 2020)
    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 ...
  • Volvach, L. N.; Volvach, A. E.; Larinov, M. G.; MacLeod, G. C.; Wolak, Paweł; Olech, Mateusz; Kramer, B.; Menten, K.; Kraus, A.; Brand, J.; Zanicelli, A.; Poppi, S.; Rigini, S. (Astronomy Letters, 2019-06-25)
    —Powerful flares in Galactic kilomasers are closely associated with regions of intense star formation. They contribute to the elucidation of physical processes occurring in these structures. We have recorded a superpowerful ...
  • Bartkiewicz, Anna; Szymczak, Marian; van Langevelde, Huib Jan (EDP Sciences, 2016)
    Context. Methanol masers at 6.7 GHz are well known tracers of high-mass star-forming regions. However, their origin is still not clearly understood. Aims. We aimed to determine the morphology and velocity structure for a ...
  • Bartkiewicz, Anna; Szymczak, Marian; van Langevelde, Huib Jan (EDP Sciences, 2014)
    Context. Methanol masers at 6.7 GHz are associated with high-mass star-forming regions (HMSFRs) and often have mid-infrared (MIR) counterparts characterized by extended emission at 4.5 μm, which likely traces outflows from ...
  • Surcis, Gabriele; Vlemmings, Wouter; van Langevelde, Huib Jan; Hutawarakorn Kramer, Busaba; Bartkiewicz, Anna (EDP Sciences, 2019)
    Magnetohydrodynamical simulations show that the magnetic field can drive molecular outflows during the formation of massive protostars. The best probe to observationally measure both the morphology and the strength of this ...
  • Szymczak, Marian; Olech, Mateusz; Wolak, Paweł; Gerard, Eric; Bartkiewicz, Anna (EDP Sciences, 2018)
    Context.High-mass young stellar objects (HMYSOs) can undergo accretion episodes that strongly affect the star evolution, the dynamics of the disk, and its chemical evolution. Recently reported ...
  • Olech, Mateusz; Szymczak, Marian; Wolak, Paweł; Gérard, Eric; Bartkiewicz, Anna (Astronomy & Astrophysics, 2020-02-01)
    Context: Periodic flares of maser emission are thought to be induced either by variations of the seed photon flux in young binary systems or the pump rate regulated by stellar and accretion luminosities. Aims: We seek to ...
  • Bartkiewicz, Anna; Szymczak, Marian; van Langevelde, Huib Jan (EDP Sciences, 2012)
    Context. The 22.2 GHz water masers are often associated with the 6.7 GHz methanol masers but owing to the different excitation conditions they likely probe independent spatial and kinematic regions around the powering young ...
  • Szymczak, Marian; Olech, Mateusz; Sarniak, Rafał; Wolak, Paweł; Bartkiewicz, Anna (Oxford University Press, 2018-02)
    We report results of 6.7 GHz methanol maser monitoring of 139 star-forming sites with theTorun 32 m radio telescope from June 2009 to February 2013. The targets were observedat least once a month, with higher ...
  • Bartkiewicz, Anna; Sanna, Alberto; Szymczak, Marian; Moscadelli, Luca; van Langevelde, Huib Jan; Wolak, Paweł (2020-05)
    Context. Ring-like distributions of the 6.7 GHz methanol maser spots at milliarcsecond scales represent a family of molecular structures of unknown origin associated with high-mass young stellar objects. Aims: We aim to ...

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