Sardinia Radio Telescope: General Description, Technical Commissioning and First Light

Bolli, Pietro; Orlati, A.; Stringhetti, L.; Orfei, A.; Righini, S.; Ambrosini, R.; Bartolini, Marco; Bortolotti, C.; Buffa, Franco; Buttu, Marco; Cattani, A.; D’Amico, N.; Deiana, Gian Luigi; Fara, A.; Fiocchi, F.; Gaudiomonte, Francesco; Maccaferri, A.; Mariotti, Sergio; Marongiu, P.; Melis, A.; Migoni, Carlo; Morsiani, M.; Nanni, M.; Nasyr, F.; Pellizzoni, A.; Pisanu, T.; Poloni, M.; Poppi, S.; Porceddu, I.; Prandoni, I.; Roda, J.; Roma, Mauro; Scalambra, A.; Serra, G.; Trois, A.; Valente, G.; Vargiu, G.; Zacchiroli, G.

doi:10.1142/s2251171715500087

Cited by 96 publications

(80 citation statements)

References 24 publications

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“…The integrated flux densities from M31 presented in this Letter are part of the observations undertaken in 2016 during the Early Science Commissioning Phase of the INAF-Sardinia Radio Telescope (SRT) (Bolli et al 2015;Murgia et al 2016;Prandoni et al 2017). With its 64 m primary mirror, the SRT, at 6.7 GHz, has a beam primary lobe width at half maximum (FWHM) of ≃2 ′ .9.…”

Section: Observations and Data Analysismentioning

confidence: 99%

Strong Evidence of Anomalous Microwave Emission from the Flux Density Spectrum of M31

Battistelli

Fatigoni

Murgia

et al. 2019

ApJL

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We have observed the Andromeda galaxy, Messier 31 (M31), at 6.7 GHz with the Sardinia Radio Telescope. We mapped the radio emission in the C-band, re-analyzed W M AP and P lanck maps, as well as other ancillary data, and we have derived an overall integrated flux density spectrum from the radio to the infrared. This allowed us to estimate the emission budget from M31. Integrating over the whole galaxy, we found strong and highly significant evidence for anomalous microwave emission (AME), at the level of 1.45 +0.17 −0.19 Jy at the peaking frequency of ≃25 GHz. Decomposing the spectrum into known emission mechanisms such as free-free, synchrotron, thermal dust, and AME arising from electric dipole emission from rapidly rotating dust grains, we found that the overall emission from M31 is dominated, at frequencies below 10 GHz, by synchrotron emission with a spectral index of -1.10 +0.10 −0.08 ,

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Section: Observations and Data Analysismentioning

confidence: 99%

Strong Evidence of Anomalous Microwave Emission from the Flux Density Spectrum of M31

Battistelli

Fatigoni

Murgia

et al. 2019

ApJL

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“…The antenna was officially opened on September 30th 2013, upon completion of the technical commissioning phase (Bolli et al 2015). The scientific commissioning of the SRT was carried out in the period 2012-2015 (Prandoni et al, submitted).…”

Section: The Srt Multi-frequency Observations Of Galaxy Clusters (Smog)mentioning

confidence: 99%

Sardinia Radio Telescope observations of Abell 194

Govoni

Murgia

Vacca

et al. 2017

A&A

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Aims. We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands. Methods. We analyze new total intensity and polarization observations of Abell 194 obtained with the Sardinia Radio Telescope (SRT). We use the SRT data in combination with archival Very Large Array observations to derive both the spectral aging and Rotation Measure (RM) images of the radio galaxies 3C 40A and 3C 40B embedded in Abell 194. To obtain new additional insights in the cluster structure we investigate the redshifts of 1893 galaxies, resulting in a sample of 143 fiducial cluster members. We analyze the available ROSAT and Chandra observations to measure the electron density profile of the galaxy cluster.Results. The optical analysis indicates that Abell 194 does not show a major and recent cluster merger, but rather agrees with a scenario of accretion of small groups, mainly along the NE-SW direction. Under the minimum energy assumption, the lifetimes of synchrotron electrons in 3C40 B measured from the spectral break are found to be 157±11 Myrs. The break frequency image and the electron density profile inferred from the X-ray emission are used in combination with the RM data to constrain the intra-cluster magnetic field power spectrum. By assuming a Kolmogorov power law power spectrum with a minimum scale of fluctuations of Λ min = 1 kpc, we find that the RM data in Abell 194 are well described by a magnetic field with a maximum scale of fluctuations of Λ max = (64 ± 24) kpc. We find a central magnetic field strength of B 0 = (1.5 ± 0.2) µG, the lowest ever measured so far in galaxy clusters based on Faraday rotation analysis. Further out, the field decreases with the radius following the gas density to the power of η=1.1±0.2. Comparing Abell 194 with a small sample of galaxy clusters, there is a hint of a trend between central electron densities and magnetic field strengths.

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“…We triggered an approved proposal with the Medicina 32m radio telescope and obtained ToO observations with the European VLBI Network (EVN), the Very Long Baseline Array (VLBA), and the 64m Sardinia Radio Telescope (SRT, Bolli et al 2015;Prandoni et al in prep.). Details of the data acquisition and reduction are given below.…”

Section: Radio Datamentioning

confidence: 99%

The 999thSwiftgamma-ray burst: Some like it thermal

Nappo

Pescalli

Oganesyan

et al. 2017

A&A

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We present a multiwavelength study of GRB 151027A. This is the 999th gamma-ray burst detected by the Swift satellite and it has a densely sampled emission in the X-ray and optical band and has been observed and detected in the radio up to 140 days after the prompt. The multiwavelength light curve from 500 seconds to 140 days can be modelled through a standard forward shock afterglow, but it requires an additional emission component to reproduce the early X-ray and optical emission. We present optical observations performed with the Telescopio Nazionale Galileo (TNG) and the Large Binocular Telescope (LBT) 19.6, 33.9, and 92.3 days after the trigger which show a bump with respect to a standard afterglow flux decay and are interpreted as possibly due to the underlying supernova and host galaxy (at a level of ∼ 0.4 µJy in the optical R band, R AB ∼ 25). Radio observations, performed with the Sardinia Radio Telescope (SRT) and Medicina in single-dish mode and with the European Very Long Baseline Interferometer (VLBI) Network and the Very Long Baseline Array (VLBA), between day 4 and 140 suggest that the burst exploded in an environment characterized by a density profile scaling with the distance from the source (wind profile). A remarkable feature of the prompt emission is the presence of a bright flare 100 s after the trigger, lasting ∼70 seconds in the soft X-ray band, which was simultaneously detected from the optical band up to the MeV energy range. By combining Swift-BAT/XRT and Fermi-GBM data, the broadband (0.3-1000 keV) time resolved spectral analysis of the flare reveals the coexistence of a non-thermal (power law) and thermal blackbody components. The blackbody component contributes up to 35% of the luminosity in the 0.3-1000 keV band. The γ-ray emission observed in Swift-BAT and Fermi-GBM anticipates and lasts less than the soft X-ray emission as observed by Swift-XRT, arguing against a Comptonization origin. The blackbody component could either be produced by an outflow becoming transparent or by the collision of a fast shell with a slow, heavy, and optically thick fireball ejected during the quiescent time interval between the initial and later flares of the burst.

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Sardinia Radio Telescope: General Description, Technical Commissioning and First Light

Cited by 96 publications

References 24 publications

Strong Evidence of Anomalous Microwave Emission from the Flux Density Spectrum of M31

Strong Evidence of Anomalous Microwave Emission from the Flux Density Spectrum of M31

Sardinia Radio Telescope observations of Abell 194

The 999thSwiftgamma-ray burst: Some like it thermal

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