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Stretching a length reaching 10 pc projected in the plane of sky, the radio jet associated with Herbig-Haro objects 80 and 81 (HH 80-81) is known as the largest and best collimated protostellar jet in our Galaxy. The nature of the molecular…

星系天体物理 · 物理学 2019-05-01 Keping Qiu , Friedrich Wyrowski , Karl Menten , Qizhou Zhang , Rolf Guesten

We report Very Large Array (VLA) observations in the Q-band toward 10 ionized jet candidates to search for SiO emission, a well-known shocked gas tracer. We detected 7 mm continuum counterparts toward 90% of the jet candidates. In most…

星系天体物理 · 物理学 2023-02-01 Tatiana M. Rodriguez , Peter Hofner , Isaac Edelman , Esteban D. Araya , Viviana Rosero

We present Submillimter Array 1.3 mm waveband continuum and molecular line observations of the HH 80-81 high-mass star-forming region. The dust continuum emission reveals two dominant peaks MM1 and MM2, and line emission from high-density…

星系天体物理 · 物理学 2015-05-13 Keping Qiu , Qizhou Zhang

We present Submillimeter Array (SMA) observations in the CO J=3-2, SiO J=5-4 and 8-7, and SO 9_8-8_7 lines, as well as Atacama Pathfinder EXperiment (APEX) observations in the CO J=6-5 line, of an extremely high-velocity and jet-like…

星系天体物理 · 物理学 2019-04-03 Yu Cheng , Keping Qiu , Qizhou Zhang , Friedrich Wyrowski , Karl Menten , Rolf Guesten

We present several molecular line emission arcsec and subarcsec observations obtained with the Submillimeter Array (SMA) in the direction of the massive protostar IRAS 18162-2048, the exciting source of HH 80-81. The data clearly indicates…

We present ${\sim}0.2$ arcsec ($\sim$80 au) resolution observations of the CO (2-1) and SiO (5-4) lines made with the Atacama large millimeter/submillimeter array toward an extremely young intermediate-mass protostellar source (t$_{\rm…

Both high- and low-velocity outflows are occasionally observed around a protostar by molecular line emission. The high-velocity component is called `Extremely High-Velocity (EHV) flow,' while the low-velocity component is simply referred as…

太阳与恒星天体物理 · 物理学 2019-02-13 Yuko Matsushita , Satoko Takahashi , Masahiro N. Machida , Kohji Tomisaka

We present high angular resolution (12"-24") and high sensitivity 12CO and 13CO J=2-1 and J=1-0 observations of the HH 1-2 outflow. The observations show the molecular counterpart, moving with a velocity of approx. 30 km/s, of the optical…

天体物理学 · 物理学 2009-10-31 A. Moro-Martin , J. Cernicharo , A. Noriega-Crespo , J. Martin-Pintado

We present Very Large Array (VLA) high resolution observations of the NH3(1,1) and NH3(2,2) molecular transitions towards the high mass star forming region AFGL 437. Our aim was to investigate if the poorly collimated CO molecular outflow…

星系天体物理 · 物理学 2015-06-03 G. Manjarrez , J. F. Gomez , I. de Gregorio-Monsalvo

We report the discovery of a very dense jet-like fast molecular outflow surrounded by a wide-angle wind in a massive young stellar object (MYSO) G18.88MME (stellar mass $\sim$8 M$_{\odot}$) powering an Extended Green Object G18.89$-$0.47.…

星系天体物理 · 物理学 2021-07-07 I. I. Zinchenko , L. K. Dewangan , T. Baug , D. K. Ojha , N. K. Bhadari

We present new high-angular resolution observations toward the driving source of the HH 80-81 jet (IRAS 18162-2048). Continuum emission was observed with the Very Large Array at 7 mm and 1.3 cm, and with the Submillimeter Array at 860…

We present Submillimeter Array (SMA) 1.35 mm subarcsecond angular resolution observations toward the LkH{\alpha} 234 intermediate-mass star-forming region. The dust emission arises from a filamentary structure of $\sim$5 arcsec ($\sim$4500…

We present subarcsecond angular resolution observations carried out with the Submillimeter Array (SMA) at 880 $\mu$m centered at the B0-type protostar GGD27~MM1, the driving source of the parsec scale HH 80-81 jet. We constrain its…

太阳与恒星天体物理 · 物理学 2017-10-04 J. M. Girart , R. Estalella , M. Fernández-López , S. Curiel , P Frau , R. Galvan-Madrid , R. Rao , G. Busquet , C. Juárez

We observed the HH 211 jet in the submillimeter continuum and the CO(3-2) and SiO(8-7) transitions with the Submillimeter Array. The continuum source detected at the center of the outflow shows an elongated morphology, perpendicular to the…

天体物理学 · 物理学 2009-11-13 A. Palau , P. T. P. Ho , Q. Zhang , R. Estalella , N. Hirano , H. Shang , C. -F. Lee , T. L. Bourke , H. Beuther , Y. -J. Kuan

Submillimetre and millimetre observations are important in probing the properties of the molecular gas and dust around obscured active galactic nuclei (AGNs) and their feedback. With very high-resolution (0."02x0."03 (2x3 pc)) ALMA 345 GHz…

We performed interferometric observations of a high-mass protostellar candidate IRAS 18566+0408 in the \nh3 (J,K)=(1,1), (2,2) and (3,3) inversion transitions, the SiO J=2-1 and HCN J=1-0 lines, and the 43 and 87 GHz continuum emission…

天体物理学 · 物理学 2009-11-13 Qizhou Zhang , T. K. Sridharan , Todd R. Hunter , Yuan Chen , Henrik Beuther , Friedrich Wyrowski

Submillimeter Array 1.3mm line and continuum observations toward the young massive star-forming region IRAS18182-1433 are presented. The data are complemented with short-spacing CO(2-1) observations and SiO(1-0) data from the VLA. Multiple…

天体物理学 · 物理学 2009-11-11 H. Beuther , Q. Zhang , T. K. Sridharan , C. -F. Lee , L. A. Zapata

We present the results of Very Large Array NH$_{3}$ $(J,K)=(1,1)$ and $(2,2)$ observations of the HH 111/HH 121 protostellar system. HH 111, with a spectacular collimated optical jet, is one of the most well-known Herbig-Haro objects. We…

We have performed a 1.3 centimeter survey of 24 massive young stellar objects (MYSOs) using the Expanded Very Large Array (EVLA). The sources in the sample exhibit a broad range of massive star formation signposts including Infrared Dark…

星系天体物理 · 物理学 2015-03-30 C. L. Brogan , T. R. Hunter , C. J. Cyganowski , R. K. Friesen , C. J. Chandler , R. Indebetouw

We present observations of continuum emission in the MIR to mm wavelength range, complemented with ammonia observations, of the dense core ahead of the radio Herbig Haro object HH 80N, found in the GGD 27 region. The continuum emission in…

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