Absorption by Spinning Dust: A Contaminant for High-redshift 21 cm Observations

Draine, B. T.; Miralda-Escudé, Jordi

doi:10.3847/2041-8213/aac08a

Cited by 32 publications

(24 citation statements)

References 30 publications

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“…Therefore the validity of these claims have been debated (e.g. in Hills et al 2018;Draine & Miralda-Escudé 2018;Singh & Subrahmanyan 2019;Bradley et al 2019), and unconventional physical processes such as an unknown cooling mechanism (see e.g., Tashiro et al 2014;Barkana 2018;Fialkov et al 2018;Muñoz & Loeb 2018; or the presence of an additional radio background on top of the CMB (Feng & Holder 2018;Ewall-Wice et al 2018;Fialkov & Barkana 2019;Mebane et al 2020) have been invoked to explain these results.…”

Section: Introductionmentioning

confidence: 99%

Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations

Ghara

Giri

Mellema

et al. 2020

Monthly Notices of the Royal Astronomical Society

108

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We derive constraints on the thermal and ionization states of the intergalactic medium (IGM) at redshift ≈ 9.1 using new upper limits on the 21-cm power spectrum measured by the LO-FAR radio-telescope and a prior on the ionized fraction at that redshift estimated from recent cosmic microwave background (CMB) observations. We have used results from the reionization simulation code GRIZZLY and a Bayesian inference framework to constrain the parameters which describe the physical state of the IGM. We find that, if the gas heating remains negligible, an IGM with ionized fraction 0.13 and a distribution of the ionized regions with a characteristic size 8 h −1 comoving megaparsec (Mpc) and a full width at the half maximum (FWHM) 16 h −1 Mpc is ruled out. For an IGM with a uniform spin temperature T S 3 K, no constraints on the ionized component can be computed. If the large-scale fluctuations of the signal are driven by spin temperature fluctuations, an IGM with a volume fraction 0.34 of heated regions with a temperature larger than CMB, average gas temperature 7-160 K and a distribution of the heated regions with characteristic size 3.5-70 h −1 Mpc and FWHM of 110 h −1 Mpc is ruled out. These constraints are within the 95 per cent credible intervals. With more stringent future upper limits from LOFAR at multiple redshifts, the constraints will become tighter and will exclude an increasingly large region of the parameter space.

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Section: Introductionmentioning

confidence: 99%

Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations

Ghara

Giri

Mellema

et al. 2020

Monthly Notices of the Royal Astronomical Society

108

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“…However, the mechanism beyond the anomaly remains to-date unclear. Furthermore, the significance of the measurement and the treatment of the foregrounds is currently under debate [22,23].…”

Section: Introductionmentioning

confidence: 99%

Constraints on ALPs and excited dark matter from the EDGES 21 cm absorption signal

et al. 2018

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The recent observation of the 21 cm absorption signal by the EDGES experiment provides a new observational window into the dynamics of the young Universe. Based on this result, we constrain the properties of ALPs and excited dark matter via the energy injections into the gaseous medium that these models produce. In particular, we derive bounds that outperform the present constraints for energy injections in the 10.2 eV to 50 keV range by analysing the intensity of Lyman-α photons and the electron emissivity produced by ionising radiation. Our results also show that once the standard temperature of the soft radiation background is assumed, the explanations of the observed 3.5 keV photon signal within the considered dark matter model are excluded at 95% confidence level.

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“…(2.1) and (2.2) if the dark matter-baryon coupling can cool the baryons such that the matter temperature T K 2.5 K in the redshift range of interest. 1 Other possible explanations of this result include a possible systematic error [66] and absorption from spinning dust grains in the Galactic ISM [56].…”

Section: Jcap12(2020)034mentioning

confidence: 91%