The VLBA CANDELS GOODS-North Survey. I - Survey Design, Processing, Data Products, and Source Counts

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2024) stae253

Authors:

Roger P Deane, Jack F Radcliffe, Ann Njeri, Alexander Akoto-Danso, Gianni Bernardi, Oleg M Smirnov, Rob Beswick, Michael A Garrett, Matt J Jarvis, Imogen H Whittam, Stephen Bourke, Zsolt Paragi

Abstract:

<jats:title>Abstract</jats:title> <jats:p>The past decade has seen significant advances in wide-field cm-wave very long baseline interferometry (VLBI), which is timely given the wide-area, synoptic survey-driven strategy of major facilities across the electromagnetic spectrum. While wide-field VLBI poses significant post-processing challenges that can severely curtail its potential scientific yield, many developments in the km-scale connected-element interferometer sphere are directly applicable to addressing these. Here we present the design, processing, data products, and source counts from a deep (11 μJy beam−1), quasi-uniform sensitivity, contiguous wide-field (160 arcmin2) 1.6 GHz VLBI survey of the CANDELS GOODS-North field. This is one of the best-studied extragalactic fields at milli-arcsecond resolution and, therefore, is well-suited as a comparative study for our Tera-pixel VLBI image. The derived VLBI source counts show consistency with those measured in the COSMOS field, which broadly traces the AGN population detected in arcsecond-scale radio surveys. However, there is a distinctive flattening in the S1.4GHz ∼100-500 μJy flux density range, which suggests a transition in the population of compact faint radio sources, qualitatively consistent with the excess source counts at 15 GHz that is argued to be an unmodelled population of radio cores. This survey approach will assist in deriving robust VLBI source counts and broadening the discovery space for future wide-field VLBI surveys, including VLBI with the Square Kilometre Array, which will include new large field-of-view antennas on the African continent at ≳1000 km baselines. In addition, it may be useful in the design of both monitoring and/or rapidly triggered VLBI transient programmes.</jats:p>

Behind the mask: can HARMONI@ELT detect biosignatures in the reflected light of Proxima b?

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 528:2 (2024) 3509-3522

Authors:

Sophia R Vaughan, Jayne L Birkby, Niranjan Thatte, Alexis Carlotti, Mathis Houllé, Miguel Pereira-Santaella, Fraser Clarke, Arthur Vigan, Zifan Lin, Lisa Kaltenegger

Mapping dust in the giant molecular cloud Orion A

(2024)

Authors:

Amery Gration, John Magorrian

The formation of cores in galaxies across cosmic time – the existence of cores is not in tension with the ΛCDM paradigm

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 528:2 (2024) 1655-1667

Authors:

RA Jackson, S Kaviraj, SK Yi, S Peirani, Y Dubois, G Martin, JEG Devriendt, A Slyz, C Pichon, M Volonteri, T Kimm, K Kraljic

Widespread AGN feedback in a forming brightest cluster galaxy at $z=4.1$ unveiled by JWST

ArXiv 2401.12199 (2024)

Authors:

Aayush Saxena, Roderik A Overzier, Montserrat Villar-Martín, Tim Heckman, Namrata Roy, Kenneth J Duncan, Huub Röttgering, George Miley, Catarina Aydar, Philip Best, Sarah EI Bosman, Alex J Cameron, Krisztina Éva Gabányi, Andrew Humphrey, Sandy Morais, Masafusa Onoue, Laura Pentericci, Victoria Reynaldi, Bram Venemans