A Search for H2CO 6cm Emission toward Young Stellar Objects III: VLA Observations

Abstract

We report the results of our third survey for formaldehyde (H2CO) 6cm maser emission in the Galaxy. Using the Very Large Array, we detected two new H2CO maser sources (G23.01-0.41 and G25.83-0.18), thus increasing the sample of known H2CO maser regions in the Galaxy to seven. We review the characteristics of the G23.01-0.41 and G25.83-0.18 star forming regions. The H2CO masers in G23.01-0.41 and G25.83-0.18 share several properties with the other known H2CO masers, in particular, emission from rich maser environments and close proximity to very young massive stellar objects.

Accepted for publication in the Astrophysical Journal Supplement Series

References in corpus (24)

• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• Toward Understanding Massive Star Formation
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• A general catalogue of 6.7 GHz methanol masers. I: data
• Millimetre continuum observations of southern massive star formation regions. I. SIMBA observations of cold cores
• A CH3CN and HCO+ survey towards southern methanol masers associated with star formation
• Probing Pre-Protosellar Cores with Formaldehyde
• Resolution of Distance Ambiguities of Inner Galaxy Massive Star Formation Regions II
• Multi-wavelength observations of Southern Hot Molecular Cores traced by methanol masers - I. Ammonia and 24 GHz Continuum Data
• Outflows from Massive YSOs as Seen with the Infrared Array Camera
• Detection of new sources of methanol emission at 95 GHz with the Mopra telescope
• Dust and gas emission in the prototypical hot core G29.96-0.02 at sub-arcsecond resolution
• The Relationship between Class I and Class II Methanol Masers
• The Formaldehyde Masers in NGC 7538 and G29.96-0.02: VLBA, MERLIN, and VLA Observations
• A Jet-like Outflow toward the High-Mass (Proto)stellar Object IRAS 18566+0408
• Outflows from the high-mass protostars NGC 7538 IRS1/2 observed with bispectrum speckle interferometry -- Signatures of flow precession
• Candidate Rotating Toroids around High-Mass (Proto)Stars
• High-velocity gas toward hot molecular cores: evidence for collimated outflows from embedded sources
• The kinematics of molecular clumps surrounding hot cores in G29.96-0.02 and G31.41+0.31
• Non-equilibrium excitation of methanol in Galactic molecular clouds: multi-transitional observations at 2 mm
• The Formaldehyde Masers in Sgr B2: Very Long Baseline Array and Very Large Array Observations
• An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408
• A New Galactic 6cm Formaldehyde Maser
• A Review of H2CO 6cm Masers in the Galaxy

Cited by in corpus (19)

• A Class I and Class II Methanol Maser Survey of Extended Green Objects (EGOs) from the GLIMPSE Survey
• Trigonometric Parallaxes of Massive Star Forming Regions: V. G23.01-0.41 and G23.44-0.18
• Quasi-Periodic Formaldehyde Maser Flares in the Massive Protostellar Object IRAS18566+0408
• VLBI study of maser kinematics in high-mass SFRs. II. G23.01-0.41
• Weak and Compact Radio Emission in Early High-Mass Star Forming Regions: I. VLA Observations
• Discovery of a sub-Keplerian disk with jet around a 20Msun young star. ALMA observations of G023.01-00.41
• High-mass star-forming cloud G0.38+0.04 in the Galactic Center Dust Ridge contains H2CO and SiO masers
• Weak and Compact Radio Emission in Early High-Mass Star Forming Regions: II. The Nature of the Radio Sources
• The Emission Structure of Formaldehyde MegaMasers
• A global view on star formation: The GLOSTAR Galactic plane survey VIII. Formaldehyde absorption in Cygnus~X
• Formaldehyde Anti-Inversion at z=0.68 in the Gravitational Lens B0218+357
• EVN observations of 6.7 GHz methanol maser polarization in massive star-forming regions IV. Magnetic field strength limits and structure for 7 additional sources
• Methyl Cyanide Observations Toward Massive Protostars
• The Rare 23.1-GHz Methanol Masers in NGC 7538 IRS 1
• Long-term Variability of H${}_2$CO Masers in Star-forming Regions
• Study of Interstellar Molecular Clouds using Formaldehyde Absorption toward Extragalactic Radio Sources
• Revisiting the formaldehyde masers
• Rethinking Habitability using Biogenic Precursors: Formaldehyde in Millimeter Molecular Clouds of the Inner Galaxy
• Notes on the formaldehyde masers