1. RRI Digital Repository
  2. 04. Astronomy and Astrophysics
  3. Research Papers (A&A)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6675
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSathyanarayana Rao, Mayuri-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorChluba, Jens-
dc.date.accessioned2017-07-10T14:17:18Z-
dc.date.available2017-07-10T14:17:18Z-
dc.date.issued2017-01-
dc.identifier.citationAstronomical Journal, 2017, Vol. 153, P26en_US
dc.identifier.issn‎0004-6256-
dc.identifier.issn1538-3881(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/6675-
dc.descriptionOpen Accessen_US
dc.description.abstractWe present the Global Model for the Radio Sky Spectrum (GMOSS), a novel, physically motivated model of the low-frequency radio sky from 22 MHz to 23 GHz. GMOSS invokes different physical components and associated radiative processes to describe the sky spectrum over 3072 pixels of 5° resolution. The spectra are allowed to be convex, concave, or of more complex form with contributions from synchrotron emission, thermal emission, and free–free absorption included. Physical parameters that describe the model are optimized to best fit four all-sky maps at 150 MHz, 408 MHz, 1420 MHz, and 23 GHz and two maps at 22 and 45 MHz generated using the Global Sky Model of de Oliveira-Costa et al. The fractional deviation of the model from data has a median value of 6% and is less than 17% for 99% of the pixels. Though aimed at the modeling of foregrounds for the global signal arising from the redshifted 21 cm line of hydrogen during the Cosmic Dawn and the Epoch of Reionization (EoR), over redshifts $150\lesssim z\lesssim 6$, GMOSS is well suited for any application that requires simulating spectra of the low-frequency radio sky as would be observed by the beam of any instrument. The complexity in spectral structure that naturally arises from the underlying physics of the model provides a useful expectation for departures from smoothness in EoR foreground spectra and hence may guide the development of algorithms for EoR signal detection. This aspect is further explored in a subsequent paper.en_US
dc.language.isoenen_US
dc.publisherIOP Sciences for The American Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2017AJ....153...26Sen_US
dc.relation.urihttp://arxiv.org/abs/1607.07453en_US
dc.relation.urihttp://dx.doi.org/10.3847/1538-3881/153/1/26en_US
dc.rights2016 American Astronomical Societyen_US
dc.subjectgravitational lensingen_US
dc.subjectcosmic background radiationen_US
dc.subjectobservations – ISMen_US
dc.subjectobservational – radio continuumen_US
dc.titleGMOSS: All-sky model of spectral radio brightness based on physical components and associated radiative processesen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
2017_AstronomicalJournal_153_26.pdfOpen Access4.91 MBAdobe PDFView/Open
Show simple item record


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.