The Lyman alpha line
The Lyman-alpha forest as a diagnostic of the nature of the dark matter
... We then compute the optical depth as function of wavelength, τ(v), thus accounting for Doppler broadening and the effects of peculiar velocities. To allow for a fair comparison to the observed spectra, we convolve the ...
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Constraining the Physics of the Intergalactic and Circumgalactic Media with Lyman-alpha Absorption
... ±500km s 1 . The temperature seems to trace the gas overdensity along the skewer, except for the region within ⇠ 240 kpc from the center of the halo. This region is delimited by a steep increase of the temperature, which ...
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Lyman alpha signatures from direct collapse black holes
... resemble line profiles associated with scattering through galactic ...the line can be of order ∼ 1000 km s −1 , which is larger than what is typically found for high-redshift Lyα emitting galax- ies (see ...
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Suite of hydrodynamical simulations for the Lyman alpha forest with massive neutrinos
... Appendix A: A sanity check As discussed in Sect. 5.1, achieving numerical convergence in the modeling of the Ly α flux power spectrum is nontrivial. In addition, when we include massive neutrinos in hydrodynamical ...
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Constraining the temperature–density relation of the intergalactic medium with the Lyman alpha and beta forests
... 5 C O N C L U S I O N S We have presented a new approach to constraining the slope of the T–ρ relation using the ratio of curvatures, R κ , in the Ly α and β forests. The statistic appears robust against observational ...
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Predicting Lyman alpha escape fractions with a simple observable:Lyman alpha in emission as an empirically calibrated star formation rate indicator
... Fig. A.1. Left: The predicted relation between f esc,Lyα and Lyα EW 0 for our toy model, which shows little to no correlation by sampling all physical parameters independently (see Table A.1). We also show the observed ...
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Predicting Lyman alpha escape fractions with a simple observable:Lyman alpha in emission as an empirically calibrated star formation rate indicator
... Hα line for faint MUSE LAEs are thus expected to find typical Hα luminosities of 2 × 10 41 erg s −1 and as low as ≈ 1 − 2 × 10 40 erg s −1 for the faintest ...
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New approach for precise computation of Lyman alpha forest power spectrum with hydrodynamical simulations
... the line-of-sight pixels, are typically between −20% and + ...the Lyman-α forest, the total heating rate per unit volume is independent of the amplitude of the UV ...
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About AGN ionization echoes, thermal echoes, and ionization deficits in low redshift Lyman-alpha blobs
... the AGN have faded recently and more quickly than the EELRs’ typical light crossing times. GBs have not been investigated further apart from the single case study of Davies et al. (2015), In this paper, we have presented ...
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The Lyman alpha luminosity function at z=5 7 6 6 and the steep drop of the faint end:implications for reionization
... ABSTRACT We present new results from the widest narrow band survey search for Lyα emitters at z = 5.7, just after reionization. We survey a total of 7 deg 2 spread over the COSMOS, UDS and SA22 fields. We find over ...
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The nature of luminous Lyman alpha emitters at z~2 3:maximal dust poor starbursts and highly ionising AGN
... with no realisation (p < 10 −4 ) consistent with a zero slope. However, the strong trend could be a consequence of a sharp change in the population from narrow to broad-line emitters from low to high luminosities. ...
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Lyman‐alpha variability during solar flares over solar cycle 24 using GOES‐15/EUVS‐E
... The launch of GOES‐13 in 2006 (and subsequently, GOES‐14 and ‐15) saw the inclusion of the EUVS in order to characterize the solar EUV irradiance with a cadence of 10.24 s. EUVS comprises five channels: A, B, C, D, and E, ...
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SWAN Lyman alpha imager cometary hydrogen coma observations
... The objective of the work has been to uti- lize the wealth of cometary data obtained with the SWAN (Solar Wind ANisotropies) instrument on board the SOHO (SOlar and Heliospheric Ob- serv[r] ...
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Alpha Alpha On-Line MISSION STATEMENT
... One of the topics discussed and will be voted on at the June State Conference is to combine the Councils from 12 to 5 At the present time, our Council 10 consists of Beta Psi (Clay County), Beta Eta (Terre Haute) and ...
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The Mean Ultraviolet Spectrum of a Representative Sample of Faint z~3 Lyman Alpha Emitters
... Based on the binary stellar population photoionization models, the stronger LAEs sample has an average metallicity of Z 0.05– 0.2 Z , while the weaker LAEs sample has a somewhat higher [r] ...
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A possible solution to the Lyman/Balmer line problem in hot DA white dwarfs
... Hydrogen Lyman and Balmer absorption ...the Lyman and Balmer lines are discrepant, which worsens with increasing ...in line blanketing treatments and the photoionization cross ...the Lyman and ...
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Enhanced Alpha Plane Line Protection
... transmission line is utilized in alpha plane differential principle to detect an internal ...compensated line. In this work, phase current based adaptive alpha plane differential protection ...
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First constraints on fuzzy dark matter from Lyman alpha forest data and hydrodynamical simulations
... from Lyman-α forest ...the Lyman- α flux power spectrum in these models and compare with the observed flux power spectrum from two different data sets: the XQ-100 and HIRES/MIKE quasar spectra ...
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Non LTE modelling of prominence fine structures using hydrogen Lyman line profiles
... observed Lyman-line profiles were reproduced with the Voigt function in the wings and with a negative Gaussian in the cen- tral reversal, as is shown in an example of the Ly α profile in ...the ...
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Comparison of Lyman-alpha and LI-COR infrared hygrometers for airborne measurement of turbulent fluctuations of water vapour
... 4 Results 4.1 Vibrations during the Do128 flight The time series of the mixing ratio (Fig. 3) shows the gen- eral behaviour of the Li2 sensor, the slow Humicap and the fast Lyman-alpha sensor. The time ...
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