L1157-B1: Water and ammonia as diagnostics of shock temperature

Abstract

We investigate the origin and nature of the profiles of water and ammonia observ ed toward the L1157-B1 clump as part of the HIFI CHESS survey (Ceccarelli et al. 2010) using a new code coupling a gas-grain chemical model with a parametric shock model. Fir st results from the unbiased survey (Lefloch et al. 2010, Codella et al. 2010) reveal different molecular components at different excitation conditions coexisting in the B1 bow shock structure, with NH${}_3$, H${}_2$CO and CH${}_3$OH emitting only at relatively low outflow velocities whereas H${}_2$O shows bright emission at high velocities. Our model suggests that these differences are purely chemical and can be explained by the presence of a C-type shock whose maximum temperature must be close to 4000 K along the B1 clump.

Accepted by ApJ Letters

References in corpus (5)

• Parametrization of C-shocks. Evolution of the Sputtering of Grains
• Quasi-classical rate coefficient calculations for the rotational (de)excitation of H2O by H2
• The clumpy structure of the chemically active L1157 outflow
• Time-dependent simulations of steady C-type shocks
• A detailed modelling of the chemically rich clumps along the CB3 outflow

Cited by in corpus (58)

• Interstellar water chemistry: from laboratory to observations
• Water in star-forming regions (WISH): Physics and chemistry from clouds to disks as probed by Herschel spectroscopy
• Molecular line emission in NGC1068 imaged with ALMA: II. The chemistry of the dense molecular gas
• UCLCHEM: A Gas-Grain Chemical Code
• Phosphorus-bearing molecules in solar-type star forming regions: First PO detection
• A lambda=3 mm molecular line survey of NGC1068. Chemical signatures of an AGN environment
• Star formation and nuclear activity in luminous infrared galaxies: An infrared through radio review
• Water and methanol in low-mass protostellar outflows: gas-phase synthesis, ice sputtering and destruction
• Chemical Features in the Circumnuclear Disk of the Galactic Center
• Ammonia Thermometry of Star Forming Galaxies
• H2S in the L1157-B1 Bow shock
• The B1 shock in the L1157 outflow as seen at high spatial resolution
• Grand challenges in protoplanetary disc modelling
• Seeds of Life in Space (SOLIS) V. Methanol and acetaldehyde in the protostellar jet-driven shocks L1157-B0 and B1
• The CHESS survey of the L1157-B1 shock: the dissociative jet shock as revealed by Herschel--PACS
• Herschel HIFI observations of O${}_2$ toward Orion: special conditions for shock enhanced emission
• ALMA imaging of C2H emission in the disk of NGC1068
• Spatial distribution of small hydrocarbons in the neighborhood of the Ultra Compact HII region Monoceros R2
• Seeds of Life in Space (SOLIS). VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
• Molecular shock tracers in NGC 1068: SiO and HNCO
• Exploring organic chemistry in planet-forming zones
• Water emission from the chemically rich outflow L1157
• A Multi-Transition Study of Molecules toward NGC 1068 based on High-Resolution Imaging Observations with ALMA
• A statistical study of giant molecular clouds traced by ${}^{13}$CO, C${}^{18}$O, CS, and CH${}_3$OH in the disk of NGC 1068 based on ALMA observations
• Phosphorous chemistry in the shocked region L1157 B1
• Extended warm gas in Orion KL as probed by methyl cyanide
• The Herschel/HIFI spectral survey of OMC-2 FIR 4 (CHESS): An overview of the 480 to 1902 GHz range
• Observations of CH${}_3$OH and CH${}_3$CHO in a Sample of Protostellar Outflow Sources
• First detection of Hydrogen Chloride towards protostellar shocks
• Molecular transitions as probes of the physical conditions of extragalactic environments
• A 2-3 mm high-resolution molecular line survey towards the centre of the nearby spiral galaxy NGC 6946
• 74 MHz Nonthermal Emission from Molecular Clouds: Evidence for a Cosmic Ray Dominated Region at the Galactic Center
• A search for Cyanopolyynes in L1157-B1
• Merger-induced Shocks in the Nearby LIRG VV 114 through Methanol Observations with ALMA
• The SVS13-A Class I chemical complexity as revealed by S-bearing species. SOLIS XIII
• AGN-driven Cold Gas Outflow of NGC 1068 Characterized by Dissociation-Sensitive Molecules
• Seeds of Life in Space SOLIS. IX. Chemical segregation of $\mathrm{S}{\mathrm{O}}_2$ and SO toward the low-mass protostellar shocked region of L1157
• ALCHEMI finds a "shocking" carbon footprint in the starburst galaxy NGC~253
• Tracing shock type with chemical diagnostics: an application to L1157
• Chemical evolution of the gas in C-type shocks in dark clouds
• The L1157 protostellar outflow imaged with the SMA
• Broad N2H+ emission towards the protostellar shock L1157-B1
• The L1157-B1 astrochemical laboratory: testing the origin of DCN
• Diagnosing shock temperature with NH${}_3$ and H${}_2$O profiles
• HCN/HNC chemistry in shocks: a study of L1157-B1 with ASAI
• First detection of methanol towards a post-AGB object, HD101584
• The Opaque Heart of the Galaxy IC 860: Analogous Protostellar, Kinematics, Morphology, and Chemistry
• The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE. II. A detailed kinematic analysis of the DR21 Main outflow
• A detailed temperature map of the archetypal protostellar shocks in L1157
• An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
• A Luminous Blue Variable Star Interacting with a Nearby Infrared Dark Cloud
• Astrochemistry in external galaxies: how to use molecules as probes of their physical conditions
• Cyanopolyyne line survey towards high-mass star-forming regions with TMRT
• Molecules in the Circumnuclear Disk of the Galactic Center
• Shock-type inference of L1157 B2 using methanol desorption
• Formation of phosphorus monoxide (PO) in the interstellar medium: insights from quantum-chemical and kinetic calculations
• Seed of Life in Space (SOLIS) XI. First measurement of nitrogen fractionation in shocked clumps of the L1157 protostellar outflow
• High resolution ALMA observations of dense molecular medium in the central regions of active galaxies