Detection of a hot core in the intermediate-mass (IM) Class 0 protostar NGC 7129--FIRS2

Abstract

We report high angular resolution (~0.6''x0.5'' at 1.3mm) observations of the Class 0 intermediate-mass (IM) protostar NGC 7129--FIRS 2 using the PdBI. Our observations show the existence of a hot core at the position of the Class 0 object. This is, up to our knowledge, the first IM hot core detected so far. Interferometric maps of the region in the the continuum at 3mm and 1.3mm and in the CH3CN 5_k-->4_k, CH3OH 5_kk'-->4_kk', and D2CO 4_04-->3_03 lines are presented in this paper. Enhanced CH3CN and CH3OH abundances are measured towards the hot core (X(CH3CN)~7.010^{-9}, X(CH3OH)~3 10^{-8}-- a few 10^{-7}). While intense D2CO emission is detected towards the hot core, the N2D+ line has not been detected in our interferometric observations. The different behaviors of D2CO and N2D+ emissions suggest different formation mechanisms for the two species and different deuteration processes for H2CO and N2H+ (surface and gas-phase chemistry, respectively). Finally, the spectrum of the large bandwidth correlator show a forest of lines at the hot core position revealing that this object is extraordinarily rich in complex molecules.

arXiv comment14 pages, 7 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (19)

• Systematic Molecular Differentiation in Starless Cores
• Probing the evolutionary status of starless cores through N2H+ and N2D+ observations
• N2H+ and C18O Depletion in a Cold Dark Cloud
• Evaporation of ices near massive stars: models based on laboratory TPD data
• Does IRAS 16293-2422 have a hot core? Chemical inventory and abundance changes in its protostellar environment
• Complex molecules in the hot core of the low mass protostar NGC1333-IRAS4A
• Complete Depletion in prestellar cores
• Abundant H2D+ in the pre-stellar core L1544
• CO Depletion and Deuterium Fractionation in Prestellar Cores
• Molecular ions in L1544. I. Kinematics
• Resetting chemical clocks of hot cores based on S-bearing molecules
• The H2CO abundance in the inner warm regions of low mass protostellar envelopes
• Detection of D2H+ in the Dense Interstellar Medium
• Detection of abundant solid methanol toward young low mass stars
• Deuterium fractionation on interstellar grains studied with modified rate equations and a Monte Carlo approach
• IRAS 16293-2442B: A Compact, Possibly Isolated Protoplanetary Disk in a Class 0 Object
• The structure of molecular clumps around high-mass young stellar objects
• Deuterium fractionation on interstellar grains studied with the direct master equation approach
• First evidence for dusty disks around Herbig Be stars

Cited by in corpus (29)

• Accretion disks in luminous young stellar objects
• Hierarchical Fragmentation and Jet-like Outflows in IRDC G28.34+0.06, a Growing Massive Protostar Cluster
• Early stages of cluster formation: fragmentation of massive dense cores down to ~1000 AU
• A necklace of dense cores in the high-mass star forming region G35.20-0.74N: ALMA observations
• Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 Region. III. An Extensive Survey for Molecular Outflows
• Spectral line survey of the ultracompact HII region Mon R2
• Decrease of the organic deuteration during the evolution of Sun-like protostars: the case of SVS13-A
• Physical structure of the envelopes of intermediate-mass protostars
• First Hot Corino detected around an Isolated Intermediate-Mass Protostar: Cep\,E-mm
• The hot core towards the intermediate mass protostar NGC7129 FIRS 2: Chemical similarities with Orion KL
• Complex organic molecules in organic-poor massive young stellar objects
• A combined IRAM and Herschel/HIFI study of cyano(di)acetylene in Orion KL: tentative detection of DC3N
• Deuteration around the ultracompact HII region Mon R2
• IRAS 22198+6336: Discovery of an Intermediate-Mass Hot Core
• Intermediate-mass hot cores at 500 AU: disks or outflows?
• The IC1396N proto-cluster at a scale of 250 AU
• Chemical study of intermediate-mass (IM) Class 0 protostars. CO depletion and N2H+ deuteration
• Herschel-PACS spectroscopy of the intermediate mass protostar NGC7129 FIRS 2
• The Small-Scale Physical Structure and Fragmentation Difference of Two Embedded Intermediate Mass Protostars in Orion
• Dissecting an intermediate-mass (IM) protostar: Chemical differentiation in IC1396N
• The abundance of C18O and HDO in the envelope and hot core of the intermediate mass protostar NGC 7129 FIRS 2
• Outflow forces in intermediate mass star formation
• On the nature of the enigmatic object IRAS 19312+1950: A rare phase of massive star formation?
• Complex Molecule Formation in Grain Mantles
• The warm CO gas along the UV-heated outflow cavity walls: a possible interpretation for the Herschel/PACS CO spectra of embedded YSOs
• A Chandra and Spitzer census of the young star cluster in the reflection nebula NGC 7129
• Gas vs. solid phase deuterated chemistry: HDCO and D${}_2$CO in massive star-forming regions
• High angular resolution imaging of the circumstellar material around intermediate mass (IM) stars
• Singly- and doubly-deuterated formaldehyde in massive star-forming regions