Discovery of a Perseus-like cloud in the early Universe: HI-to-H2 transition, carbon monoxide and small dust grains at zabs=2.53 towards the quasar J0000+0048

Abstract

We present the discovery of a molecular cloud at zabs=2.5255 along the line of sight to the quasar J0000+0048. We perform a detailed analysis of the absorption lines from ionic, neutral atomic and molecular species in different excitation levels, as well as the broad-band dust extinction. We find that the absorber classifies as a Damped Lyman-alpha system (DLA) with logN(HI)(cm^-2)=20.8+/-0.1. The DLA has super-Solar metallicity with a depletion pattern typical of cold gas and an overall molecular fraction ~50%. This is the highest f-value observed to date in a high-z intervening system. Most of the molecular hydrogen arises from a clearly identified narrow (b~0.7 km/s), cold component in which CO molecules are also found, with logN(CO)~15. We study the chemical and physical conditions in the cold gas. We find that the line of sight probes the gas deep after the HI-to-H2 transition in a ~4-5 pc-size cloud with volumic density nH~80 cm^-3 and temperature of only 50 K. Our model suggests that the presence of small dust grains (down to about 0.001 μm) and high cosmic ray ionisation rate (zeta_H a few times 10^-15 s^-1) are needed to explain the observed atomic and molecular abundances. The presence of small grains is also in agreement with the observed steep extinction curve that also features a 2175 A bump. The properties of this cloud are very similar to what is seen in diffuse molecular regions of the nearby Perseus complex. The high excitation temperature of CO rotational levels towards J0000+0048 betrays however the higher temperature of the cosmic microwave background. Using the derived physical conditions, we correct for a small contribution (0.3 K) of collisional excitation and obtain TCMB(z = 2.53)~9.6 K, in perfect agreement with the predicted adiabatic cooling of the Universe. [abridged]

arXiv comment24 pages, 24 figures, accepted for publication in A&A

References in corpus (102)

• emcee: The MCMC Hammer
• The chemical composition of the Sun
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Star Formation in Galaxies Along the Hubble Sequence
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• A computer program for fast non-LTE analysis of interstellar line spectra
• A Quantitative Comparison of SMC, LMC, and Milky Way UV to NIR Extinction Curves
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• The Temperature of the Cosmic Microwave Background
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• Damped Lyman alpha Systems
• The Dark Molecular Gas
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
• The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks
• A model for atomic and molecular interstellar gas: The Meudon PDR code
• An Empirical Relation between Sodium Absorption and Dust Extinction
• The Atomic to Molecular Transition in Galaxies. II: HI and H_2 Column Densities
• [OII] as a Star Formation Rate Indicator
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• Precision measures of the primordial abundance of deuterium
• Column density distribution and cosmological mass density of neutral gas: Sloan Digital Sky Survey-III Data Release 9
• On the (Non)Evolution of HI Disks over Cosmic Time
• A FUSE Survey of Interstellar Molecular Hydrogen in Translucent Clouds
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• Evolution of the cosmological mass density of neutral gas from Sloan Digital Sky Survey II - Data Release 7
• The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman-alpha systems
• H3+ in Diffuse Interstellar Clouds: a Tracer for the Cosmic-Ray Ionization Rate
• Signatures of Cool Gas Fueling a Star-Forming Galaxy at Redshift 2.3
• Cosmic evolution of the atomic and molecular gas content of galaxies
• HI-to-H2 Transitions and H I Column Densities in Galaxy Star-Forming Regions
• A FUSE Survey of Interstellar Molecular Hydrogen in the Small and Large Magellanic Clouds
• CO-dark gas and molecular filaments in Milky Way type galaxies
• The evolution of the Cosmic Microwave Background Temperature: Measurements of TCMB at high redshift from carbon monoxide excitation
• The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman-alpha systems: Physical conditions in the neutral gas
• Abundances and Behavior of 12CO, 13CO, and C2 in Translucent Sight Lines
• Models of turbulent dissipation regions in the diffuse interstellar medium
• Direct Measurement of the Ratio of Carbon Monoxide to Molecular Hydrogen in the Diffuse Interstellar Medium
• An X-shooter composite of bright 1 < z < 2 quasars from UV to infrared
• First detection of CO in a high-redshift DLA
• Molecular Hydrogen in Star-forming regions: implementation of its micro-physics in Cloudy
• A translucent interstellar cloud at z=2.69: CO, H2 and HD in the line-of-sight to SDSS J123714.60+064759.5
• Galaxy Counterparts of metal-rich Damped Lyman-alpha Absorbers - I: The case of the z=2.35 DLA towards Q2222-0946
• Damped Lyman-alpha absorbers as a probe of stellar feedback
• Highest Redshift Image of Neutral Hydrogen in Emission: A CHILES Detection of a Starbursting Galaxy at z=0.376
• Detection of Lyman-alpha emission from a DLA galaxy: Possible implications for a luminosity-metallicity relation at z = 2-3
• The X-shooter Spectral Library (XSL): I. DR1. Near-ultraviolet through optical spectra from the first year of the survey
• The spin temperature of high-redshift damped Lyman-$\alpha$ systems
• The Nature of Damped Lyman Alpha Systems and Their Hosts in the Standard Cold Dark Matter Universe
• A connection between extremely strong Damped Lyman-alpha Systems and Lyman-alpha Emitting Galaxies at small impact parameters
• Comprehensive Study of a z = 2.35 DLA Galaxy: Mass, Metallicity, Age, Morphology and SFR from HST and VLT
• A High Resolution Study of the HI-H2 Transition across the Perseus Molecular Cloud
• Diffuse molecular gas at high redshift: Detection of CO molecules and the 2175 Å dust feature at z=1.64
• Interstellar H I and H_2 in the Magellanic Clouds: An Expanded Sample Based on UV Absorption-Line Data
• Metallicity as a criterion to select H2 bearing Damped Lyman-alpha systems
• A Pilot Survey of HI in Field Galaxies at Redshift z~0.2
• Excitation mechanisms in newly discovered H2-bearing Damped Lyman-alpha clouds: systems with low molecular fractions
• Directly imaging damped Ly-alpha galaxies at z>2. III: The star formation rates of neutral gas reservoirs at z~2.7
• Mining for Dust in Type 1 Quasars
• On the sizes of z>2 Damped Lyman-alpha Absorbing Galaxies
• Hubble Space Telescope Survey of Interstellar ^12CO/^13CO in the Solar Neighborhood
• Interstellar CN and CH+ in Diffuse Molecular Clouds: 12C/13C Ratios and CN Excitation
• HD molecules at high redshift: A low astration factor of deuterium in a solar-metallicity DLA system at z=2.418
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• Molecular hydrogen absorption systems in Sloan Digital Sky Survey
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• Properties of Dust Grains Probed with Extinction Curves
• Deuterium at high-redshift: Primordial abundance in the zabs = 2.621 damped Ly-alpha system towards CTQ247
• On the enhanced cosmic-ray ionization rate in the diffuse cloud towards Zeta Persei
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• A multiwavelength investigation of the temperature of the cold neutral medium
• On the Nature of the Heat Source for Damped Lya Systems
• Probing the Physical Conditions of Atomic Gas at High Redshift
• The Lyman-alpha emission of high-z damped Lyman-alpha systems
• The Magellan Uniform Survey of Damped Lyman alpha Systems II: Paucity of Strong Molecular Hydrogen Absorption
• Phosphorus in the Diffuse Interstellar Medium
• HI-to-H2 Transitions in the Perseus Molecular Cloud
• Cold gas and a Milky Way-type 2175 Å bump in a metal-rich and highly depleted absorption system
• The elusive HI-> H2 transition in high-z damped Lyman-alpha systems
• A New FUSE Survey of Interstellar HD
• Constraint on a cosmological variation in the proton-to-electron mass ratio from electronic CO absorption
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• Detection of emission lines from z ~ 3 DLAs towards the QSO J2358+0149
• HD/H2 as a probe of the roles of gas, dust, light, metallicity and cosmic rays in promoting the growth of molecular hydrogen in the diffuse interstellar medium
• Revisiting the Chlorine Abundance in Diffuse Interstellar Clouds from Measurements with the Copernicus Satellite
• The dust content of damped Lyman-alpha systems in the Sloan Digital Sky Survey
• Ionization corrections in a multi-phase interstellar medium: Lessons from a z~2 sub-DLA
• Directional Radiation and Photodissociation Regions in Molecular Hydrogen Clouds
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• Neutral chlorine and molecular hydrogen at high redshift
• The Variation of Magnesium Depletion with Line of Sight Conditions
• Evolution of dispersion in the cosmic deuterium abundance
• Extended Lyman-alpha emission from a high-z DLA at z=3.115
• Physical conditions in three high-z H2-bearing DLAs: implications for grain size
• High-precision laser spectroscopy of the CO A${}^1\Pi$ - X${}^1{\Sigma }^{+}$ (2,0), (3,0) and (4,0) bands

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