Evolution of column density distributions within Orion~A

Abstract

We compare the structure of star-forming molecular clouds in different regions of Orion A to determine how the column density probability distribution function (N-PDF) varies with environmental conditions such as the fraction of young protostars. A correlation between the N-PDF slope and Class 0 protostar fraction has been previously observed in a low-mass star-formation region (Perseus) by Sadavoy; here we test if a similar correlation is observed in a high-mass star-forming region. We use Herschel data to derive a column density map of Orion A. We use the Herschel Orion Protostar Survey catalog for accurate identification and classification of the Orion A young stellar object (YSO) content, including the short-lived Class 0 protostars (with a $\sim$ 0.14 Myr lifetime). We divide Orion A into eight independent 13.5 pc${}^2$ regions; in each region we fit the N-PDF distribution with a power-law, and we measure the fraction of Class 0 protostars. We use a maximum likelihood method to measure the N-PDF power-law index without binning. We find that the Class 0 fraction is higher in regions with flatter column density distributions. We test the effects of incompleteness, YSO misclassification, resolution, and pixel-scale. We show that these effects cannot account for the observed trend. Our observations demonstrate an association between the slope of the power-law N-PDF and the Class 0 fractions within Orion A. Various interpretations are discussed including timescales based on the Class 0 protostar fraction assuming a constant star-formation rate. The observed relation suggests that the N-PDF can be related to an "evolutionary state" of the gas. If universal, such a relation permits an evaluation of the evolutionary state from the N-PDF power-law index at much greater distances than those accesible with protostar counts. (abridged)

A&A Letter, accepted

References in corpus (25)

• The Universality of the Stellar IMF
• Common-Resolution Convolution Kernels for Space- and Ground-Based Telescopes
• The Spitzer Space Telescope Survey of the Orion A & B Molecular Clouds - Part I: A Census of Dusty Young Stellar Objects and a Study of their Mid-IR Variability
• Probing the evolution of molecular cloud structure: From quiescence to birth
• Gravitational Collapse in Turbulent Molecular Clouds. I. Gasdynamical Turbulence
• On the Star Formation Efficiency of Turbulent Magnetized Clouds
• What determines the density structure of molecular clouds ? A case study of Orion B with Herschel
• Scanamorphos: a map-making software for Herschel and similar scanning bolometer arrays
• Filaments and ridges in Vela C revealed by Herschel: from low-mass to high-mass star-forming sites
• Herschel-Planck dust optical-depth and column-density maps: I. Method description and results for Orion
• A Herschel and APEX Census of the Reddest Sources in Orion: Searching for the Youngest Protostars
• The earliest phases of star formation - A Herschel key project. The thermal structure of low-mass molecular cloud cores
• Unfolding the Laws of Star Formation: The Density Distribution of Molecular Clouds
• Molecular clouds have power-law probability distribution functions
• Class 0 Protostars in the Perseus Molecular Cloud: A Correlation Between the Youngest Protostars and the Dense Gas Distribution
• Two Mass Distributions in the L 1641 Molecular Clouds: The Herschel connection of Dense Cores and Filaments in Orion A
• The nature of the Class I population in Ophiuchus as revealed through gas and dust mapping
• The Luminosities of Protostars in the Spitzer c2d and Gould Belt Legacy Clouds
• The Earliest Phases of Star formation observed with Herschel (EPoS): The dust temperature and density distributions of B68
• HOPS 383: An Outbursting Class 0 Protostar in Orion
• Probability Distribution Functions OF 12CO(J = 1-0) Brightness and Integrated Intensity in M51: The PAWS View
• Dust-temperature of an isolated star-forming cloud: Herschel observations of the Bok globule CB244
• Hier ist wahrhaftig ein Loch im Himmel - The NGC 1999 dark globule is not a globule
• Results from HOPS: A Multiwavelength Census of Orion Protostars
• Analytic Error Estimates

Cited by in corpus (97)

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• The Herschel Orion Protostar Survey: Spectral Energy Distributions and Fits Using a Grid of Protostellar Models
• Slingshot Mechanism in Orion: Kinematic Evidence For Ejection of Protostars by Filaments
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• The Panchromatic Hubble Andromeda Treasury VIII: A Wide-Area, High-Resolution Map of Dust Extinction in M31
• Resolving the fragmentation of high line-mass filaments with ALMA: the integral shaped filament in Orion A
• The Herschel Orion Protostar Survey: Luminosity and Envelope Evolution
• ALMA-IMF I -- Investigating the origin of stellar masses: Introduction to the Large Program and first results
• Using Herschel and Planck observations to delineate the role of magnetic fields in molecular cloud structure
• Millimeter-Wave Line Ratios and Sub-beam Volume Density Distributions
• CO line emission from galaxies in the Epoch of Reionization
• VISION - Vienna survey in Orion I. VISTA Orion A Survey
• Understanding star formation in molecular clouds III. Probability distribution functions of molecular lines in Cygnus X
• The shapes of column density PDFs - The importance of the last closed contour
• The CARMA-NRO Orion Survey: The filamentary structure as seen in C${}^{18}$O emission
• Giant molecular filaments in the Milky Way II: The fourth Galactic quadrant
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• A $Herschel-SPIRE$ Survey of the Mon R2 Giant Molecular Cloud: Analysis of the Gas Column Density Probability Density Function
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• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars V. A Characterization of Protostellar Multiplicity
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• Cloud structure of three Galactic infrared dark star-forming regions from combining ground and space based bolometric observations
• Slingshot Mechanism for Clusters: Gas Density Regulates Star Density in the Orion Nebula Cluster (M42)
• ALMA-IMF VI -- Investigating the origin of stellar masses: Core mass function evolution in the W43-MM2&MM3 mini-starburst
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• An ALMA Survey of Protoplanetary Disks in Lynds 1641
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• Gas velocity structure of the Orion A Integral Shaped Filament
• Bird's eye view of molecular clouds in the Milky Way: I. Column density and star formation from sub-pc to kpc scales
• Molecular Clouds in the Second Quadrant of the Milky Way Mid-plane from l$=$104$.{}^{\circ }$75 to l=119$.{}^{\circ }$75 and b=$-$5$.{}^{\circ }$25 to b=5$.{}^{\circ }$25
• Star-forming filament models
• Are massive dense clumps truly sub-virial? A new analysis using Gould Belt ammonia data
• Filament rotation in the California L1482 cloud
• Relationship between the column density distribution and evolutionary class of molecular clouds as viewed by ATLASGAL
• Dense Gas in a Giant Molecular Filament
• 300: An ACA 870 $\mu$m Continuum Survey of Orion Protostars and their Evolution
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• Low Mass Stars as Tracers of Star and Cluster Formation
• J-comb: An image fusion algorithm to combine observations covering different spatial frequency ranges
• Extended ammonia observations towards the 'Integral-Shaped Filament'
• On the extraction of power-law parts of the probability density functions in star-forming clouds
• The straight and isolated G350.54+0.69 filament: density profile and star formation content
• Constructing multi-scale gravitational energy spectra from molecular cloud surface density PDF -- Interplay between turbulence and gravity
• Herschel Observations of Protoplanetary Disks in Lynds 1641
• Herschel/PACS far-IR spectral imaging of a jet from an intermediate mass protostar in the OMC-2 region
• ALMA-IMF XIII: N${}_2$H${}^{+}$ kinematic analysis on the intermediate protocluster G353.41
• Probing the multi-scale interplay between gravity and turbulence - Power-law like gravitational energy spectra of the Orion Complex
• The Herschel Orion Protostar Survey: Far-Infrared Photometry and Colors of Protostars and Their Variations across Orion A and B
• Fourier-space combination of Planck and Herschel images
• Confirmation of Enhanced Long Wavelength Dust Emission in OMC 2/3
• Emergence of high-mass stars in complex fiber networks (EMERGE). I. Early ALMA Survey: observations and massive data reduction
• Dynamical Ejections of Stars due to an Accelerating Gas Filament
• Magnetic fields in star-forming systems (II): examining dust polarization, the Zeeman effect, and the Faraday rotation measure as magnetic field tracers
• The APEX Large CO Heterodyne Orion Legacy Survey (ALCOHOLS). I. Survey overview
• Interstellar extinction in Orion. Variation of the strength of the UV bump across the complex
• Alignment of dense molecular core morphology and velocity gradients with ambient magnetic fields
• VLA ammonia observations of L1287: analysis of the "Guitar" core and two filaments
• The CARMA-NRO Orion Survey: Filament Formation via Collision-Induced Magnetic Reconnection -- The Stick in Orion A
• NH${}_3$ (1,1) hyperfine intensity anomalies in the Orion A molecular cloud
• ALMA-IMF XVIII: The assembly of a star cluster: Dense N${}_2$H${}^{+}$ (1-0) kinematics in the massive G351.77 protocluster
• Core Emergence in a Massive Infrared Dark Cloud: A Comparison Between Mid-IR Extinction and 1.3 mm Emission
• The Column Density Structure of Orion A Depicted by N-PDF
• Insights from Synthetic Star-forming Regions: II. Verifying Dust Surface Density, Dust Temperature & Gas Mass Measurements with Modified Blackbody Fitting
• The link between magnetic fields and filamentary clouds II: Bimodal linear mass distributions
• Benchmarking the IRDC G351.77-0.53: Gaia DR3 distance, mass distribution, and star formation content
• The CARMA-NRO Orion Survey: Statistical Signatures of Feedback in the Orion A Molecular Cloud
• Detection of a turbulent gas component associated with a starless core with subthermal turbulence in the Orion A cloud
• Filaments in the OMC-3 cloud and uncertainties in estimates of filament profiles
• The C${}^{18}$O core mass function toward Orion A: Single-dish observations
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• A study of 90 GHz dust emissivity on molecular cloud and filament scales
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• Molecular Cloud Matching in CO and Dust in M33 I. High-Resolution Hydrogen Column Density Maps from Herschel
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• Appearance of Dusty Filaments at Different Viewing Angles
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• Stirred, not shaken: Star cluster survival in the slingshot scenario
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