A train of shocks at 3000 au scale? Exploring the clash of an expanding bubble into the NGC 1333 IRAS 4 region. SOLIS XIV

Abstract

There is evidence that the star formation process is linked to the intricate net of filaments in molecular clouds, which may be also due to gas compression from external triggers. We studied the southern region of the Perseus NGC 1333 molecular cloud, known to be heavily shaped by similar external triggers, to shed light on the process that perturbed the filament where the Class 0 IRAS4 protostars lie. We use new IRAM-NOEMA observations of SiO and CH3OH, both known to trace violent events as shocks, toward IRAS 4A as part of the Large Program Seeds Of Life in Space (SOLIS). We detected three parallel elongated ($>$6000 au) structures, called fingers, with narrow line profiles (~1.5 $km{s}^{-1}$) peaked at the cloud systemic velocity, tracing gas with high density (5-20 $10^{5}c{m}^{-3}$) and high temperature (80-160 K). They are chemically different, with the northern finger traced by both SiO and CH3OH ([CH3OH]/[SiO]~160-300), while the other two only by SiO ([CH3OH]/[SiO]$<$ 40). Among various possibilities, a train of three shocks, distanced by $>$5000 yr, would be consistent with the observations if a substantial fraction of silicon, frozen onto the grain mantles, is released by the shocks.We suggest that the shock train is due to an expanding gas bubble, coming behind NGC 1333 from the southwest and clashing against the filament, where IRAS 4A lies. Finally, we propose a solution to the two-decades long debate on the nature and origin of the widespread narrow SiO emission observed in the south part of NGC 1333, namely that it is due to unresolved trains of shocks.

accepted to MNRAS, stac083

References in corpus (29)

• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• SiO line emission from C-type shock waves : interstellar jets and outflows
• Parametrization of C-shocks. Evolution of the Sputtering of Grains
• Chains of dense cores in the Taurus L1495/B213 complex
• Seeds Of Life In Space (SOLIS): The organic composition diversity at 300--1000 au scale in Solar-type star forming regions
• The sonic scale revealed by the world's largest supersonic turbulence simulation
• Seeds of Life in Space (SOLIS) III. Formamide in protostellar shocks: evidence for gas-phase formation
• Low velocity shocks: signatures of turbulent dissipation in diffuse irradiated gas
• On the Three-Dimensional Structure of Local Molecular Clouds
• Polarised radio filaments outside the Galactic plane
• Seeding the Galactic Centre gas stream: gravitational instabilities set the initial conditions for the formation of protocluster clouds
• Unveiling the Early-Stage Anatomy of a Protocluster Hub with ALMA
• Waves on the surface of the Orion molecular cloud
• The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
• The Per-Tau Shell: A Giant Star-Forming Spherical Shell Revealed by 3D Dust Observations
• Velocity-coherent Filaments in NGC 1333: Evidence for Accretion Flow?
• Seeds of Life in Space (SOLIS) V. Methanol and acetaldehyde in the protostellar jet-driven shocks L1157-B0 and B1
• Seeds of Life in Space (SOLIS). X. Interstellar Complex Organic Molecules in the NGC 1333 IRAS 4A outflows
• Seeds of Life in Space (SOLIS). VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
• Striations in the Taurus molecular cloud: Kelvin-Helmholtz instability or MHD waves?
• Connecting the Scales: Large Area High-resolution Ammonia Mapping of NGC 1333
• Widespread SiO and CH3OH emission in Filamentary Infrared Dark Clouds
• SiO emission as a probe of Cloud-Cloud Collisions in Infrared Dark Clouds
• Probabilistic detection of spectral line components
• Multicomponent kinematics in a massive filamentary IRDC
• The Gravitational Instability of Adiabatic Filaments
• Statistical model for filamentary structures of molecular clouds -- The modified multiplicative random cascade model and its multifractal nature
• ALMA Observations toward the S-shaped Outflow and the Envelope around NGC1333 IRAS 4A2
• Localized SiO emission triggered by the passage of the W51C SNR shock

Cited by in corpus (15)

• Probing the physics of star formation (ProPStar): I. First resolved maps of the electron fraction and cosmic-ray ionization rate in NGC 1333
• Probing the Physics of Star-Formation (ProPStar): II. The first systematic search for streamers toward protostars
• Linking the dust and chemical evolution: Taurus and Perseus -- New collisional rates for HCN, HNC, and their C, N, and H isotopologues
• FAUST XX. The chemical structure and temperature profile of the IRAS 4A2 hot corino at 20-50 au
• OMC-2 FIR 4 under the microscope: Shocks, filaments, and a highly collimated jet at 100 au scales
• Tracking the ice mantle history in the Solar-type Protostars of NGC 1333 IRAS 4
• SiO Outflows in the Most Luminous and Massive Protostellar Sources of the Southern Sky
• FAUST XV. A disk wind mapped by CH${}_3$OH and SiO in the inner 300 au of the NGC 1333 IRAS 4A2 protostar
• Shaken or stirred: the diffuse interstellar medium with exceptionally high SiO abundance
• Surveys of clumps, cores, and condensations in Cygnus-X: SMA observations of SiO (5$-$4)
• ALMA observations of massive clouds in the central molecular zone: slim filaments tracing parsec-scale shocks
• First Detections of PN, PO, and PO+ toward a Shocked Low-mass Starless Core
• Dense Outflowing Molecular Gas in Massive Star-forming Regions
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- XIX. The origin of SiO emission
• The environmental imprint on molecular layering in the dusty streamer of M512