Kinematics of the ionized-to-neutral interfaces in Monoceros R2

  title={Kinematics of the ionized-to-neutral interfaces in Monoceros R2},
  author={Paolo Pilleri and Asunci{\'o}n Fuente and Maryvonne Gerin and Jos{\'e} Cernicharo and Javier R. Goicoechea and V. Ossenkopf and Christine Joblin and M. Gonz'alez-Garc'ia and Sandra P. Trevi{\~n}o-Morales and 'A. S'anchez-Monge and J{\'e}r{\^o}me Pety and Olivier Bern'e and Carsten Kramer},
  journal={Astronomy and Astrophysics},
Context. Monoceros R2 (Mon R2), at a distance of 830 pc, is the only ultra-compact H ii region (UC H ii) where its associated photon-dominated region (PDR) can be resolved with the Herschel Space Observatory. Aims. Our aim is to investigate observationally the kinematical patterns in the interface regions (i.e., the transition from atomic to molecular gas) associated with Mon R2. Methods. We used the HIFI instrument on board Herschel to observe the line profiles of the reactive ions CH + ,O H… 

Figures and Tables from this paper

Abundances of sulphur molecules in the Horsehead nebula First NS+ detection in a photodissociation region.
This is the first complete study of S- bearing species towards a PDR and shows that CS, SO, and H2S are the most abundant S-bearing molecules in the PDR with abundances of ∼ a few 10-9.
The rate constants required to model the OH+ observations in different regions of the interstellar medium have been determined using state of the art quantum methods. First, state-to-state rate
Bringing high spatial resolution to the far-infrared
The velocity-resolved data in these tracers will reveal the detailed dynamics engrained in these processes in a spatially resolved fashion, and will deliver the perfect synergy with ground-based molecular line data for the colder dense gas.
Molecular tracers of radiative feedback in Orion (OMC-1) Widespread CH+ (J = 1-0), CO (10-9), HCN (6-5), and HCO+ (6-5) emission.
Young massive stars regulate the physical conditions, ionization, and fate of their natal molecular cloud and surroundings. It is important to find tracers that help quantifying the stellar feedback
Formation of interstellar SH+from vibrationally excited H2: Quantum study of S++ H2⇄ SH++ H reaction and inelastic collision
The rate constants for the formation, destruction, and collisional excitation of SH+are calculated from quantum mechanical approaches using two new SH+2potential energy surfaces (PESs) of4A″ and2A″
Isentropic thermal instability in atomic surface layers of photodissociation regions
We consider the evolution of an isentropic thermal instability in the atomic zone of a photodissociation region (PDR). In this zone, gas heating and cooling are associated mainly with photoelectric
From forced collapse to H ii region expansion in Mon R2: Envelope density structure and age determination with Herschel
The surroundings of HII regions can have a profound influence on their development, morphology, and evolution. This paper explores the effect of the environment on H II regions in the MonR2 molecular
The far-infrared spectroscopic surveyor (FIRSS)
The Far Infrared Spectroscopic Surveyor (FIRSS) fulfills the requirements of a dedicated space-borne, far-infrared spectroscopic facility and by exploiting the legacy of recent photometric surveys it seizes the opportunity to shed light on the fundamental building processes of the authors' Universe.
On the Possible Formation and Destruction of the OD+ Ions in the Interstellar Medium.
The formation and destruction of OD is found to be less efficient than that of OH and the OD/OH abundance ratio in ISM has been evaluated from a simple astrochemical model and it is found that this ratio can be larger than D/H abundance ratio only at low temperatures.
Dynamics of cluster-forming hub-filament systems: The case of the high-mass star-forming complex Monoceros R2.
It is estimated that with the observed infall velocity, the mass-doubling time of the hub is ~ 2:5 Myr, ten times larger than the free-fall time, suggesting a dynamically old region.


Spectral line survey of the ultracompact HII region Monoceros R2
Context. Ultracompact (UC) Hii regions constitute one of the earliest phases in the formation of a massive star and are characterized by extreme physical conditions (G0 > 105 Habing field and n > 106
Detection of Reactive Ions in the Ultracompact H II Regions Monoceros R2 and G29.96–0.02
We report the first detection of the reactive ions CO+ and HOC+ toward ultracompact (UC) H II regions, particularly in Mon R2 and G29.96-0.02. We have observed two positions in Mon R2, namely, the
Herschel/HIFI observations of CO, H2O and NH3 in Monoceros R2
Context. Mon R2, at a distance of 830 pc, is the only ultracompact Hii region (UCHii) where the associated photon-dominated region (PDR) can be resolved with Herschel. Owing to its brightness and
The Star-forming Core of Monoceros R2
The central region of the Monoceros R2 molecular cloud has been studied using molecular line maps, maps in continuum emission, and an M-band (4.7 μm) absorption spectrum toward Mon R2 IRS 3. Maps
A Study of the Mutual Interaction between the Monoceros R2 Outflow and Its Surrounding Core
We present high-resolution (12''-24'')12CO(J = 2-1),13CO(2-1), CS(2-1), CS(3-2), and CS(5-4) maps of the central 4' × 4' of Mon R2 and study the bipolar outflow, the dense core, and their mutual
We model the production of OH+, H2O+, and H3O+ in interstellar clouds, using a steady-state photodissociation region code that treats the freezeout of gas species, grain surface chemistry, and
Comparative study of CH+ and SH+ absorption lines observed towards distant star-forming regions
Aims. The HIFI instrument onboard Herschel has allowed high spectral resolution and sensitive observations of ground-state transitions of three molecular ions: the methylidyne cation CH^+, its
Surface chemistry in the interstellar medium - I. H2 formation by Langmuir-Hinshelwood and Eley-Rideal mechanisms
H2 formation remains a major issue for the understanding of interstellar physics. We investigate H2 formation in the interstellar medium at the light of the most recent experimental and theoretical
Mass Flows in Cometary Ultracompact H II Regions
High spectral and spatial resolution, mid-infrared fine-structure line observations toward two ultracompact H II (UC H II) regions (G29.96-0.02 and Mon R2) allow us to study the structure and
Radiative transfer revisited for emission lines in photon dominated regions
Context. Transfer in lines controls the gas cooling of photon dominated regions (PDR) and provides many of the observational constraints that are available for their modelling. Aims. The