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Circumstellar OH maser lines are useful for studying the dynamics of the circumstellar envelope (CSE) around evolved stars. This study aims to identify CSEs around cold stars, which exhibit deviations from the spherical expansion, by…

Solar and Stellar Astrophysics · Physics 2024-12-03 Jia-Yong Xie , Jun-ichi Nakashima , Yong Zhang

We present an 86 GHz SiO (v = 1, J = 2 ---> 1) maser search toward late-type stars located within |b|<0.5 deg and 20 deg < l < 50 deg. This search is an extension at longer longitudes of a previously published work. We selected 135 stars…

Astrophysics of Galaxies · Physics 2018-11-07 M. Messineo , H. J. Habing , L. O. Sjouwerman , A. Omont , K. M. Menten

We present the preliminary results of a survey for OH megamasers underway at the Arecibo Observatory. The goals of the survey are to calibrate the luminosity function of OH megamasers to the low-redshift galaxy merger rate (0.1 < z < 0.2),…

Astrophysics · Physics 2009-10-31 Jeremy Darling , Riccardo Giovanelli

We present MERLIN observations of the continuum (both 1.6 and 5 GHz) and OH maser emission towards Arp220. the correct spatial configuration of the various componnents of the galaxy is revealed. In the eastern component the masers are shown…

We present the final results from the Arecibo Observatory OH megamaser survey. We discuss in detail the properties of the remaining 18 OH megamasers detected in the survey, including 3 redetections. We place upper limits on the OH emission…

Astrophysics · Physics 2009-11-07 Jeremy Darling , Riccardo Giovanelli

The Galactic Center contains large amounts of molecular and ionized gas as well as a plethora of energetic objects. Water masers are an extinction-insensitive probe for star formation and thus ideal for studies of star formation stages in…

Astrophysics of Galaxies · Physics 2018-08-22 Juergen Ott , Nico Krieger , Matthew Rickert , David S Meier , Adam Ginsburg , Farhad Yusef-Zadeh , the SWAG team

It has been proposed that radio pulsars can be distinguished from other point-like radio sources in continuum images by their unique interstellar scintillation signatures. Using data from the Australian Square Kilometre Array Pathfinder…

We present the results of the first dedicated survey for 22 GHz H$_2$O maser emission in dwarf galaxies outside of the local group, with the aim of discovering disc masers. Studies of disc masers yield accurate and precise measurements of…

Astrophysics of Galaxies · Physics 2020-10-21 M. J. Rosenthal , I. Zaw

Aims. We aimed at investigating the structure and kinematics of the gaseous disk and outflows around the massive YSO S255 NIRS3 in the S255IR-SMA1 dense clump. Methods. Observations of the S255IR region were carried out with ALMA at two…

Astrophysics of Galaxies · Physics 2017-10-11 I. Zinchenko , S. -Y. Liu , Y. -N. Su , A. M. Sobolev

Mass loss is a key aspect of stellar evolution, particularly in evolved massive stars, yet episodic mass loss remains poorly understood. To investigate this, we need evolved massive stellar populations across various galactic environments.…

We present the spectral and spatial evolution of H$_2$O masers associated with the water fountain source IRAS 18043$-$2116 found in the observations with the Nobeyama 45 m telescope and the Australia Telescope Compact Array. We have found…

Solar and Stellar Astrophysics · Physics 2023-05-10 L. Uscanga , H. Imai , J. F. Gómez , D. Tafoya , G. Orosz , T. P. McCarthy , Y. Hamae , K. Amada

We report the discovery of new, high-velocity narrow-line components of the OH megamaser in IRAS 20100-4156. Results from the Australian Square Kilometre Array Pathfinder (ASKAP)'s Boolardy Engineering Test Array (BETA) and the Australia…

We present a study of star formation in the Central Molecular Zone (CMZ) of our Galaxy through the association of three star formation indicators: 6.7 GHz CH3OH masers, 22 GHz H2O masers, and enhanced 4.5 micron emission (`green') sources.…

Astrophysics of Galaxies · Physics 2015-06-17 E. T. Chambers , F. Yusef-Zadeh , J. Ott

We report one OH 1665-MHz detection in new observations with the NSF's Karl G. Jansky Very Large Array. To the authors' knowledge, this is the first OH maser detection in M33. The source occurs at a position of $\alpha=23.50069(9)^{\circ}$…

Astrophysics of Galaxies · Physics 2018-02-01 Eric Koch , Erik Rosolowsky , Megan C. Johnson , Amanda A. Kepley , Adam Leroy

Methanol masers can provide valuable insight into the processes involved in high-mass star formation, however the local environment in which they form is still unclear. Four primary, yet conflicting, models have emerged to explain the…

Astrophysics of Galaxies · Physics 2013-06-25 Richard Dodson , Charles Moriarty

To better understand the physical properties of accretion disks in high-mass star formation, we present a study of a 12 high-mass accretion disk candidates observed at high spatial resolution with the Australia Telescope Compact Array…

Solar and Stellar Astrophysics · Physics 2014-11-20 H. Beuther , A. J. Walsh , S. N. Longmore

We present full-polarization VLBA maps of the ground-state, main-line, 2 Pi 3/2, J = 3/2 OH masers in 18 Galactic massive star-forming regions. This is the first large polarization survey of interstellar hydroxyl masers at VLBI resolution.…

Astrophysics · Physics 2009-11-11 Vincent L. Fish , Mark J. Reid , Alice L. Argon , Xing-Wu Zheng

We report results of 6.7 GHz methanol maser monitoring of 139 star-forming sites with the Torun 32 m radio telescope from June 2009 to February 2013. The targets were observed at least once a month, with higher cadences of 2-4 measurements…

Astrophysics of Galaxies · Physics 2017-12-20 Marian Szymczak , Mateusz Olech , Rafał Sarniak , Paweł Wolak , Anna Bartkiewicz

Context: We investigated the molecular gas associated with 6.7 GHz methanol masers throughout the Galaxy using a J=1-0 transition of the CO isotopologues. Methods:Using the 13.7-meter telescope at the Purple Mountain Observatory (PMO), we…

Solar and Stellar Astrophysics · Physics 2014-09-05 Zhiyuan Ren , Yuefang Wu , Tie Liu , Lixin Li , Di Li , Binggang Ju

We report the discovery of 141 new high proper motion systems (1.0"/yr > mu >= 0.4"/yr) in the southern sky (Declination = -90 degrees to -47 degrees) brighter than UKST plate R_{59F} = 16.5 via our SuperCOSMOS-RECONS (SCR) search. When…

Astrophysics · Physics 2009-11-10 John P. Subasavage , Todd J. Henry , Nigel C. Hambly , Misty A. Brown , Wei-Chun Jao