WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION

@article{Choi2012WATERAM,
  title={WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION},
  author={Minho Choi and Miju Kang and Do-young Byun and Jeong-Eun Lee},
  journal={The Astrophysical Journal},
  year={2012},
  volume={759}
}
The NGC 2024 FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n, while one component was associated with FIR 4. A typical lifetime of the water maser velocity components is about eight months. The components showed velocity fluctuations with a typical drift rate of… 

Figures and Tables from this paper

WATER AND METHANOL MASER SURVEY OF PROTOSTARS IN THE ORION MOLECULAR CLOUD COMPLEX
The results of a maser survey toward 99 protostars in the Orion molecular cloud complex are presented. The target sources are low-mass protostars identified from infrared observations. Single-dish
RADIO OBSERVATIONS OF THE STAR FORMATION ACTIVITIES IN THE NGC 2024 FIR 4 REGION
Star formation activities in the NGC 2024 FIR 4 region were studied by imaging centimeter continuum sources and water maser sources using several archival data sets from the Very Large Array. The
SIMULTANEOUS OBSERVATION OF WATER AND CLASS I METHANOL MASERS TOWARD CLASS II METHANOL MASER SOURCES
We present a simultaneous single-dish survey of 22 GHz water masers and 44 and 95 GHz class I methanol masers toward 77 6.7 GHz class II methanol maser sources, which were selected from the Arecibo
44 GHz Methanol Masers: Observations toward 95 GHz Methanol Masers
We report a simultaneous 44 and 95 GHz class I methanol maser survey toward 144 sources from the 95 GHz class I methanol maser catalog. The observations were made with the three telescopes of the
How Do Stars Gain Their Mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions
Most protostars have luminosities that are fainter than expected from steady accretion over the protostellar lifetime. The solution to this problem may lie in episodic mass accretion—prolonged
Online Database of Class I Methanol Masers
TLDR
Analysis of the data collected in the database shows that the distribution of class I meetinghanol maser sources is similar to that of class II methanol masers, which are mostly found in the molecular ring, where the majority of the OB stars are located.

References

SHOWING 1-10 OF 32 REFERENCES
Class I methanol masers in low-mass star formation regions
Abstract Four Class I maser sources were detected at 44, 84, and 95 GHz toward chemically rich outflows in the regions of low-mass star formation NGC 1333I4A, NGC 1333I2A, HH25, and L1157. One more
A Multi-Epoch, Simultaneous Water and Methanol Maser Survey toward Intermediate-Mass Young Stellar Objects
We report a multi-epoch, simultaneous 22 GHz H2O and 44 GHz Class I CH3OH maser line survey toward 180 intermediate-mass young stellar objects, including 14 Class 0 and 19 Class I objects, and 147
New 9.9-GHz methanol masers
The Australia Telescope Compact Array has been used to make the first extensive search for the class I methanol masers at 9.9 GHz. In total, 48 regions of high-mass star formation were observed. In
A Catalog of CH 3 OH 7 0 -6 1 A + Maser Sources in Massive Star-forming Regions
We present a Very Large Array survey of 44 massive star-forming regions in the 44 GHz 70-61 A+ methanol transition; 37 fields showed maser emission. Thirty-one sources were also observed in the 23
RADIO IMAGING OF THE NGC 2024 FIR 5/6 REGION: A HYPERCOMPACT H ii REGION CANDIDATE IN ORION
The NGC 2024 FIR 5/6 region was observed in the 6.9 mm continuum with an angular resolution of about 1.5 arcsec. The 6.9 mm continuum map shows four compact sources, FIR 5w, 5e, 6c, and 6n, as well
THE MAGNETIC FIELD IN THE NGC 2024 FIR 5 DENSE CORE
We used the Submillimeter Array to observe the thermal polarized dust emission from the protostellar source NGC 2024 FIR 5. The polarized emission outlines a partial hourglass morphology for the
Interferometric Mapping of Magnetic Fields in Star-forming Regions. II. NGC 2024 FIR 5
We present the first interferometric polarization maps of the NGC 2024 FIR 5 molecular core, obtained with the BIMA array at approximately 2'' resolution. We measure an average position angle of -60°
Submillimetre continuum images of the NGC 2024 star-forming ridge
We present 450- and 800-μm images, made with the James Clerk Maxwell Telescope, of the NGC 2024 molecular ridge. The seven previously known compact cores, FIR1–7, have been detected, and FIR5 has
The protostellar mass limit for 6.7 GHz methanol masers. I. A low-mass YSO survey
We report the results of a search for 6.7 GHz methanol masers toward low-mass young stellar objects (YSOs) and (pre)protostellar condensations with the Australia Telescope Compact Array (ATCA). Our
Submillimeter spectral line observations in very dense regions
The 5 m antenna of the MM-Wave Observatory at the University of Texas was used to scan the cores of M17, S140 and NGC 2024 in an attempt to detect high density regions featuring matter in freefall in
...
...