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Apercal -- The Apertif Calibration Pipeline
B. Adebahr, R. Schulz, T. J. Dijkema +33
Apertif (APERture Tile In Focus) is one of the Square Kilometre Array (SKA) pathfinder facilities. The Apertif project is an upgrade to the 50-year-old Westerbork Synthesis Radio T…
No need for dark matter: resolved kinematics of the ultra-diffuse galaxy AGC 114905
Pavel E. Mancera Piña, Filippo Fraternali, Tom Oosterloo +3
We present new HI interferometric observations of the gas-rich ultra-diffuse galaxy AGC 114905, which previous work, based on low-resolution data, identified as an outlier of the b…
Combining LOFAR and Apertif Data for Understanding the Life Cycle of Radio Galaxies
Raffaella Morganti, Nika Jurlin, Tom Oosterloo +10
Active galactic nuclei (AGN) at the centres of galaxies can cycle between periods of activity and of quiescence. Characterising the duty-cycle of AGN is crucial for understanding t…
AGC 226178 and NGVS 3543: Two deceptive dwarfs towards Virgo
Michael G. Jones, David J. Sand, Michele Bellazzini +21
The two sources AGC 226178 and NGVS 3543, an extremely faint, clumpy, blue stellar system and a low surface brightness dwarf spheroidal, are adjacent systems in the direction of th…
Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope
W. A. van Cappellen, T. A. Oosterloo, M. A. W. Verheijen +87
We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of the Westerbork Synthesis Radio Telescope which has transformed this telescope into a h…
The ALFALFA Almost-Dark Galaxy AGC~229101: A Two Billion Solar Mass HI Cloud with a Very Low Surface Brightness Optical Counterpart
Lukas Leisman, Katherine L. Rhode, Catherine Ball +11
We present results from deep HI and optical imaging of AGC 229101, an unusual HI source detected at v = 7116 km/s in the ALFALFA survey. Initially classified as a can…
MIGHTEE-HI: The baryonic Tully-Fisher relation over the last billion years
Anastasia A. Ponomareva, Wanga Mulaudzi, Natasha Maddox +17
Using a sample of 67 galaxies from the MIGHTEE Survey Early Science data we study the HI-based baryonic Tully-Fisher relation (bTFr), covering a period of one billion years (…
The Intrinsic Shapes of Low Surface Brightness Galaxies: a Discriminant of LSBG Formation Mechanisms
Erin Kado-Fong, Mihai Petrescu, Majid Mohammad +8
We use the low surface brightness galaxy (LSBG) samples created from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP, 781 galaxies), the Dark Energy Survey (DES, 20977 gala…
A tight angular-momentum plane for disc galaxies
Pavel E. Mancera Piña, Lorenzo Posti, Gabriele Pezzulli +4
The relations between the specific angular momenta () and masses () of galaxies are often used as a benchmark in analytic models and hydrodynamical simulations as they are co…
Galaxy Properties at the Faint End of the HI Mass Function
Kristen B. W. McQuinn, Anjana K. Telidevara, Jackson Fuson +9
The Survey of HI in Extremely Low-mass Dwarfs (SHIELD) includes a volumetrically complete sample of 82 gas-rich dwarfs with M_HI~<10^7.2 Msun selected from the ALFALFA survey. We a…
A search for radio emission from double-neutron star merger GW190425 using Apertif
Olivér Boersma, Joeri van Leeuwen, Elizabeth A. K. Adams +26
Detection of the electromagnetic emission from coalescing binary neutron stars (BNS) is important for understanding the merger and afterglow. We present a search for a radio counte…
VLA Imaging of HI-bearing Ultra-Diffuse Galaxies from the ALFALFA Survey
Lexi Gault, Lukas Leisman, Elizabeth A. K. Adams +12
Ultra-diffuse galaxies have generated significant interest due to their large optical extents and low optical surface brightnesses, which challenge galaxy formation models. Here we…