Molecular clumps photoevaporation in ionized regions

Abstract

We study the photoevaporation of molecular clumps exposed to a UV radiation field including hydrogen-ionizing photons ($h\nu >13.6$ eV) produced by massive stars or quasars. We follow the propagation and collision of shock waves inside clumps and take into account self-shielding effects, determining the evolution of clump size and density with time. The structure of the ionization-photodissociation region (iPDR) is obtained for different initial clump masses ($M=0.01-10^4{\mathrm{M}}_{\odot }$) and impinging fluxes ($G_0=10^2-10^5$ in units of the Habing flux). The cases of molecular clumps engulfed in the HII region of an OB star and clumps carried within quasar outflows are treated separately. We find that the clump undergoes in both cases an initial shock-contraction phase and a following expansion phase, which lets the radiation penetrate in until the clump is completely evaporated. Typical evaporation time-scales are $\simeq 0.01$ Myr in the stellar case and 0.1 Myr in the quasar case, where the clump mass is 0.1 ${\mathrm{M}}_{\odot }$ and $10^3{\mathrm{M}}_{\odot }$ respectively. We find that clump lifetimes in quasar outflows are compatible with their observed extension, suggesting that photoevaporation is the main mechanism regulating the size of molecular outflows.

arXiv comment13 pages, 12 figures, accepted for publication in MNRAS

References in corpus (40)

• A luminous quasar at a redshift of z = 7.085
• Massive Molecular Outflows and Evidence for AGN Feedback from CO Observations
• Far Infrared and Submillimeter Emission from Galactic and Extragalactic Photo-Dissociation Regions
• Photoevaporation of Circumstellar Disks due to External FUV Radiation in Stellar Aggregates
• On the effect of the Cosmic Microwave Background in high-redshift (sub-)millimeter observations
• Atomic data for astrophysics. I. Radiative recombination rates for H-like, He-like, Li-like and Na-like ions over a broad range of temperature
• A PDR-Code Comparison Study
• Discovery of an AGN-Driven Molecular Outflow in the Local Early-Type Galaxy NGC 1266
• The multi-phase winds of Markarian 231: from the hot, nuclear, ultra-fast wind to the galaxy-scale, molecular outflow
• Black Hole Outflows
• Star formation in a galactic outflow
• The fast molecular outflow in the Seyfert galaxy IC5063 as seen by ALMA
• Detection of an oxygen emission line from a high redshift galaxy in the reionization epoch
• Quasars: the characteristic spectrum and the induced radiative heating
• Feedback from Active Galactic Nuclei: Energy- versus momentum-driving
• Detection of HCN, HCO+ and HNC in the Mrk231 molecular outflow - Dense molecular gas in the AGN wind
• On the [CII]-SFR relation in high redshift galaxies
• The physics and the structure of the quasar-driven outflow in Mrk 231
• Galaxy-wide outflows: cold gas and star formation at high speeds
• Effective destruction of CO by cosmic rays: implications for tracing H${}_2$ gas in the Universe
• Zooming on the internal structure of $z\simeq 6$ galaxies
• Radiation driven implosion and triggered star formation
• SMA/PdBI multiple line observations of the nearby Seyfert2 galaxy NGC 1068: Shock related gas kinematics and heating in the central 100pc?
• 3D-PDR: A new three-dimensional astrochemistry code for treating Photodissociation Regions
• Infrared background signatures of the first black holes
• Clumps and triggered star formation in ionised molecular clouds
• Intensity mapping of [CII] from early galaxies
• Cooling and Heating Functions of Photoionized Gas
• Herschel observations of water vapour in Markarian 231
• Quasar feedback: accelerated star formation and chaotic accretion
• The M - σrelation in different environments
• Winds of change - a molecular outflow in NGC 1377? The anatomy of an extreme FIR-excess galaxy
• High resolution mapping of CO(1-0) in NGC6240
• Molecular clouds photoevaporation and FIR line emission
• On the Formation of Molecular Clumps in QSO Outflows
• Dense Clumps in Giant Molecular Clouds in the Large Magellanic Cloud: Density and Temperature Derived from ${}^{13}$CO($J=3-2$) Observations
• Near-Infrared Spectroscopy of Photodissociation Regions: The Orion Bar and Orion S
• Mapping metals at high redshift with far-infrared lines
• Herschel survey and modelling of externally-illuminated photoevaporating protoplanetary disks
• Extended [C I] and ^{13}CO(5-4) Emission in M17SW

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