Status of KaVA SFRs WG and new possible collaboration Tomoya Hirota - - PowerPoint PPT Presentation

Tomoya Hirota (NAOJ), Kee-Tae Kim (KASI),

• n behalf of KaVA SFRs sub-WG

Status of KaVA SFRs WG

and new possible collaboration

Summary of this talk

• Brief report on our KaVA SFRs WG

– KaVA SFRs Large Program (LP) – Recent progress after the last KaVA SWG meeting (2017 Nov) – Follow-up observations – Possible new collaboration: M2O – Summary and future plan

• Thanks to core members and many collaborators

– Byun, D. Y., Chibueze, J. O., Hachisuka, K., Hu, B., Hwang, E., Hwang, J., Kang, J.-H., Kim, J., Kim, J. S., Kim, K.-T., Kim, M. K., Liu, T., Matsumoto, N., Motogi, K., Oh, C. S., Sugiyama, K., Sunada, K., Wu, Y. W., and more – New members are welcome!

KaVA SFRs LP

• Understanding high-mass star formation through KaVA
• bservations of water and methanol masers
• VLBI monitoring/survey to reveal 3D velocity and spatial

structures of 22GHz H2O/44GHz CH3OH masers selected from 87 high-mass YSO (HM-YSO) samples

Examples of H2O maser maps (analyzed by Jungha Kim) First VLBI image of the 44 GHz CH3OH maser (Matsumoto et al. 2014)

KaVA SFRs LP

• Science cases

– Dynamics of disk/outflow system traced by masers – Their evolutionary scenario

Press release for Hirota et al. (2017) Reid (2007) vs Ellingsen (2007) Updated with slight modification but still controversial Matsuhita et al. (2017, 2018)

KaVA SFRs LP

• Recent progress

– 2nd year observations of 16 H2O masers and 3 CH3OH masers – 4 epochs monitoring with 2 month interval – Schedule files submitted for next semester – Talks by Jungha Kim and Sugiyama for examples

H2O masers Mode Code Note G13.87 VERA4(32 MHz) K-1 1st/2nd epoch delivered, resumed in September G10.62 VERA4(32 MHz) G45.07 VERA4(32 MHz) G25.82 VERA4(32 MHz) G19.61 VERA4(32 MHz) K-2 1st/2nd epoch delivered, resumed in September G34.24 G34.26 VERA4(32 MHz) IRAS18556 VERA4(32 MHz) G30.82 VERA4(32 MHz) G12.88 VERA4(32 MHz) K-3 1st epoch allocated in September G351.24 VERA4(32 MHz) G0.54/RCW142 VERA4(32 MHz) IRAS18094 VERA4(32 MHz) G18.34SW VERA4(32 MHz) K-4 1st epoch allocated in September IRAS18056 VERA4(32 MHz) G049.49 VERA4(32 MHz) W51D VERA4(32 MHz) CH3OH masers G357.967 VERA7(16 MHz) Q-1 1st epoch delivered G18.34SW VERA7(16 MHz) G049.49 VERA7(16 MHz)

Follow-up observations

• All are complementary to KaVA results

– VERA astrometry; on-going (by Mikyoung Kim and Jugha Kim) – ALMA cycle 3; in progress (PI: Mikyoung Kim, and others) – ALMA cycle 6; accepted (PI: Jungha Kim) – JVN; 6.7 GHz CH3OH masers; to be resumed (PI: Sugiyama) – SD; some approved program (PI: Tie Liu)

Clem & Adri Bacri-Normier (wingsforscience.com)/ESO

Annual parallax 6.7GHz methanol masers Thermal continuum/lines Large-scale structure

Follow-up observations

• ALMA cycle 3

– Already delivered (PI: Mikyoung Kim) – Millimeter CH3OH masers and KaVA data (Hirota et al. in prep)

• ALMA cycle 6

– Millimeter lines and continuum survey for 16 H2O masers (PI: Jungha Kim) approved for observations – Collaboration with Kyung Hee Univ. (Jeong-Eun Lee et al.) just started from last Monday (Sep. 3, 2018)

Example of ALMA cycle 3 spectrum and moment map of millimeter CH3OH line (color) and continuum (contour)

Most of the data are still confidential!

Possible new collaboration

• Maser Monitoring Organization (M2O)

– Since 2018 September in IAUS 336 “Astrophysical masers” – About 30 members in 13 countries (led by Gordon MacLeod) – Exchange information on each observatory to catch maser flare

• ToO observations with VLBI based on systematic single dish monitoring

Maser Monitoring Organization “M2O” at IAUS 336 (2017 Sep)

Possible new collaboration

• Examples for maser flare

– NGC6334I (Hunter et al. 2017, 2018, MacLeod et al. 2018) – S255 (Caratti o Garatti et al. 2017, Moscadelli et al. 2017) – Orion KL (Hirota et al. 2011, 2014, etc.)

• Important for understanding mass accretion processes

– Luminosity increase due to episodic accretion bursts

Infrared flare in S255 (Caratti o Garatti+2016) CH3OH maser flare in S255 (Moscadelli et al. 2017; See Szymczak et al, 2018 and Fujisawa et al. 2015 (ATEL)

Possible new collaboration

• Current project by M2O

– W49N (Honma et al. 2004, Kramer/Asanok et al., in prep.) – G25.65+1.05 (Burns/Orosz et al. in prep) – ToO with VLBA+Radio Astron, JVLA, VERA, KaVA, based on SD – Significant contribution from EA

KaVA mapping of H2Omases in G25.65 (Burns, Orosz, et al., analyzed by Hirota)

Most of the data are still confidential!

Same as left panel but with VLBA and EVN (Burns, Orosz, et al., analyzed by Burns)

Summary

• First year results have provided promising samples for

further proper motions measurements

• Second year observations are on-going
• Part of the first year results are in preparation for papers
• Follow-up observations are approved and on-going
• New collaboration are started
• We will welcome new comers at any time!