Browsing A) Producción científica UCSC by Author "Mahesh, Nivedita"

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  • Absolute calibration of diffuse radio surveys at 45 and 150 MHz 

    Monsalve, Raúl A.; Rogers, Alan E. E.; Bowman, Judd D.; Mahesh, Nivedita; Murray, Steven G.; Mozdzen, Thomas J.; Johnson, Leroy; Barrett, John; Samson, Titu; Lewis, David (2021-02)
    We use measurements from the Experiment to Detect the Global EoR Signature (EDGES) to determine scale and zero-level corrections to the diffuse radio surveys by Guzmán et al. at 45 MHz and by Landecker & Wielebinski at 150 ...

  • An absorption profile centred at 78 megahertz in the sky-averaged spectrum 

    Bowman, Judd D.; Rogers, Alan E. E.; Monsalve, Raúl; Mozdzen, Thomas J.; Mahesh, Nivedita (2018-03)
    After stars formed in the early Universe, their ultraviolet light is expected, eventually, to have penetrated the primordial hydrogen gas and altered the excitation state of its 21-centimetre hyperfine line. This alteration ...

  • Reply to Hills et al. - Concerns about modelling of the EDGES data 

    Bowman, Judd D.; Rogers, Alan E. E.; Monsalve, Raúl; Mozdzen, Thomas J.; Mahesh, Nivedita (2018-12)
    In our Letter, the foreground models account for a combination of astronomical foregrounds, ionospheric effects and any residual calibration effects. We obtained best-fit parameters that absorb a degenerate combination of ...

  • Results from EDGES high-band. II. Constraints on parameters of early galaxies 

    Monsalve, Raúl; Greig, Bradley; Bowman, Judd D.; Mesinger, Andrei; Rogers, Alan E. E.; Mozdzen, Thomas J.; Kern, Nicholas S.; Mahesh, Nivedita (2018-08)
    We use the sky-average spectrum measured by EDGES High-band (90–190 MHz) to constrain parameters of early galaxies independent of the absorption feature at 78 MHz reported by Bowman et al. These parameters represent ...

  • Results from edges high-band. iii. new constraints on parameters of the early universe 

    Monsalve, Raúl A.; Fialkov, Anastasia; Bowman, Judd D.; Rogers, Alan E. E.; Mozdzen, Thomas J.; Cohen, Aviad; Barkana, Rennan; Mahesh, Nivedita (2019-04-10)
    We present new constraints on parameters of cosmic dawn and the epoch of reionization derived from the EDGES High-Band spectrum (90–190 MHz). The parameters are probed by evaluating global 21 cm signals generated with the ...