Ammonia Imaging of the Disks in the NGC 1333 IRAS 4A Protobinary System

Abstract

The NGC 1333 IRAS 4A protobinary was observed in the ammonia (2, 2) and (3, 3) lines and in the 1.3 cm continuum with a high resolution (about 1.0 arcsec). The ammonia maps show two compact sources, one for each protostar, and they are probably protostellar accretion disks. The disk associated with IRAS 4A2 is seen nearly edge-on and shows an indication of rotation. The A2 disk is brighter in the ammonia lines but dimmer in the dust continuum than its sibling disk, with the ammonia-to-dust flux ratios different by about an order of magnitude. This difference suggests that the twin disks have surprisingly dissimilar characters, one gas-rich and the other dusty. The A2 disk may be unusually active or hot, as indicated by its association with water vapor masers. The existence of two very dissimilar disks in a binary system suggests that the formation process of multiple systems has a controlling agent lacking in the isolated star formation process and that stars belonging to a multiple system do not necessarily evolve in phase with each other.

References in corpus (6)

• A Hipparcos census of the nearby OB associations
• Unveiling the Circumstellar Envelope and Disk: A Sub-Arcsecond Survey of Circumstellar Structures
• Magnetic Fields in the Formation of Sun-Like Stars
• Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems
• Variability of the NGC 1333 IRAS 4A Outflow: Molecular Hydrogen and Silicon Monoxide Images
• Observations of Water Masers in the NGC 1333 IRAS 4 Region

Cited by in corpus (15)

• Our astrochemical heritage
• Characterizing young protostellar disks with the CALYPSO IRAM-PdBI survey: large Class 0 disks are rare
• Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?
• Signatures of Gravitational Instability in Resolved Images of Protostellar Disks
• Jet multiplicity in the proto-binary system NGC1333-IRAS4A. The detailed CALYPSO IRAM-PdBI view
• Kinematics of the Ammonia Disk around the Protostar NGC 1333 IRAS 4A2
• Simulated Observations of Young Gravitationally Unstable Protoplanetary Discs
• Seeds of Life in Space (SOLIS). VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
• Implications of a hot atmosphere/corino from ALMA observations towards NGC1333 IRAS 4A1
• X-ray induced chemistry of water and related molecules in low-mass protostellar envelopes
• Rotation of the NGC 1333 IRAS 4A2 Protostellar Jet
• Radio Imaging of the NGC 1333 IRAS 4A Region: Envelope, Disks, and Outflows of a Protostellar Binary System
• Tracing the atomic nitrogen abundance in star-forming regions with ammonia deuteration
• Radio Imaging of the NGC 1333 IRAS 4B Region
• The first interferometric measurements of NH${}_2$D/NH${}_3$ ratio in hot corinos