Unbiased water and methanol maser surveys of NGC 1333

Abstract

We present the results of unbiased 22 GHz H2O water and 44 GHz class I CH3OH methanol maser surveys in the central 7x10 arcmin area of NGC 1333 and two additional mapping observations of a 22 GHz water maser in a ~3x3arcmin area of the IRAS4A region. In the 22 GHz water maser survey of NGC 1333 with sensitivity of sigma~0.3Jy, we confirmed masers toward H2O(B) in the region of HH 7-11 and IRAS4B. We also detected new water masers at ~20arcsec away in the western direction of IRAS4B or ~25arcsec away in the southern direction of IRAS4A. We could not however find young stellar objects or molecular outflows associated with them. They showed two different velocity components of ~0 and ~16 km/s, which are blue- and red-shifted relative to the adopted systemic velocity of ~7 km/s for NGC 1333. They also showed time variabilities in both intensity and velocity from multi-epoch observations and an anti-correlation between the intensities of the blue- and the red-shifted velocity components. We suggest that the unidentified powering source of these masers might be in the earliest evolutionary stage of star formation before the onset of molecular outflows. Finding this kind of water masers is only possible by an unbiased blind survey. In the 44 GHz methanol maser survey with sensitivity of sigma~0.5 Jy, we confirmed masers toward the IRAS4A2 and the eastern shock region of the IRAS2A. Both sources are also detected in 95 and 132 GHz methanol maser lines. In addition, we had new detections of methanol masers at 95 and 132 GHz toward IRAS4B. In terms of the isotropic luminosity, we detected the methanol maser sources brighter than ~5x1025 erg/s from our unbiased survey.

arXiv comment20 pages including 5 figures, accepted by AJ

References in corpus (20)

• Rapid Formation of Molecular Clouds and Stars in the Solar Neighborhood
• Unveiling the Circumstellar Envelope and Disk: A Sub-Arcsecond Survey of Circumstellar Structures
• Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster
• Efficiencies of Low-Mass Star and Star Cluster Formation
• Astrometry of Water Maser Sources in Nearby Molecular Clouds with VERA - II. SVS 13 in NGC 1333
• The COMPLETE Survey of Outflows in Perseus
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds: VI. Perseus Observed with MIPS
• A submillimetre survey of the kinematics of the Perseus molecular cloud - II. Molecular outflows
• CARMA observations of protostellar outflows in NGC 1333
• Class I and Class II methanol masers in high-mass star forming regions
• A wide-angle outflow with the simultaneous presence of a high-velocity jet in the high-mass Cepheus A HW2 system
• A shallow though extensive H2 2.12 micron imaging survey of Taurus-Auriga-Perseus: I. NGC1333, L1455, L1448 and B1
• Water masers in the massive protostar IRAS 20126+4104: ejection and deceleration
• Clustered star formation and outflows in AFGL 2591
• Search for Class I methanol masers in low-mass star formation regions
• Tracing the base of protostellar wind(s) towards the high-mass star forming region AFGL 5142: VLA continuum and VLBA water maser observations
• First results from a VLBA proper motion survey of H2O masers in low-mass YSOs: the Serpens core and RNO15-FIR
• Time-Resolved AU-Scale Jets Traced by Masers in the IRAS 4A/B Regions of NGC1333
• Formation and evolution of the water maser outflow event in AFGL 2591 VLA 3-N
• Multi-epoch VLBA H${}_2$O maser observations toward the massive YSOs AFGL 2591 VLA 2 and VLA 3

Cited by in corpus (5)

• Online Database of Class I Methanol Masers
• Connecting the Scales: Large Area High-resolution Ammonia Mapping of NGC 1333
• Power spectra of outflow-driven turbulence
• The Effelsberg survey of FU~Orionis and EX~Lupi objects II. -- H${}_2$O maser observations
• Class I methanol masers in low-mass star formation regions