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Exploring Compact Symmetric Objects with Complex Morphologies
E. E. Sheldahl, G. B. Taylor, S. E. Tremblay +9
Compact symmetric objects (CSOs) are a unique class of jetted active galactic nuclei (AGN) defined by sub-kpc radio emission, showing radio structure on both sides of the central e…
SMILE: Discriminating milli-lens systems in a VLBI pilot project
F. M. Pötzl, C. Casadio, G. Kalaitzidakis +11
Dark Matter (DM) remains poorly probed on critical, sub-galactic scales, where predictions from different models diverge in terms of abundance and density profiles of halos. Gravit…
Unprecedented extreme high-frequency radio variability in early-stage active galactic nuclei
E. Järvelä, T. Savolainen, M. Berton +9
We report on the discovery of one of the most extreme cases of high-frequency radio variability ever measured in active galactic nuclei (AGN), observed on timescales of days and ex…
Milliarcsecond Core Size Dependence of the Radio Variability of Blazars
Po Chih Hsu, Jun Yi Koay, Satoki Matsushita +6
Studying the long-term radio variability (timescales of months to years) of blazars enables us to gain a better understanding of the physical structure of these objects on sub-pars…
Multiple imaging of the quasar 2005+403 formed by anisotropic scattering
T. A. Koryukova, A. B. Pushkarev, S. Kiehlmann +1
We report on the low Galactic latitude () quasar 2005403, the second active galactic nuclei, in which we detected a rare phenomenon of multiple imaging induced by r…
The C-Band All-Sky Survey (C-BASS): New Constraints on the Integrated Radio Spectrum of M 31
Stuart E. Harper, Adam Barr, C. Dickinson +11
The Andromeda galaxy (M31) is our closest neighbouring spiral galaxy, making it an ideal target for studying the physics of the interstellar medium in a galaxy very similar to our…
COMAP Early Science: VIII. A Joint Stacking Analysis with eBOSS Quasars
Delaney A. Dunne, Kieran A. Cleary, Patrick C. Breysse +22
We present a new upper limit on the cosmic molecular gas density at obtained using the first year of observations from the CO Mapping Array Project (COMAP). COMAP data…
Starlight-polarization-based tomography of the magnetized interstellar medium: PASIPHAE's line-of-sight inversion method
V. Pelgrims, G. V. Panopoulou, K. Tassis +20
We present the first Bayesian method for tomographic decomposition of the plane-of-sky orientation of the magnetic field with the use of stellar polarimetry and distance. This stan…
New Tests of Millilensing in the Blazar PKS 1413+135
A. L. Peirson, I. Liodakis, A. C. S. Readhead +26
Symmetric Achromatic Variability (SAV) is a rare form of radio variability in blazars that has been attributed to gravitational millilensing by a ~ mass cond…
What defines a compact symmetric object? A carefully vetted sample of CSOs
Anthony C. S. Readhead, Sebastian Kiehlmann, Matthew L. Lister +6
Compact Symmetric Objects (CSOs), young jetted-AGN of overall projected size <1 kpc, are of great interest due to their youth and evolution. The classification was introduced to di…
COMAP Early Science: VI. A First Look at the COMAP Galactic Plane Survey
Thomas J. Rennie, Stuart E. Harper, Clive Dickinson +29
We present early results from the COMAP Galactic Plane Survey conducted between June 2019 and April 2021, spanning in Galactic longitude and $|b|<1.\!\!^{\…
The variability of brightest cluster galaxies at high radio frequencies
Tom Rose, Alastair Edge, Sebastian Kiehlmann +6
Variability of a galaxy's core radio source can be a significant consequence of AGN accretion. However, this variability has not been well studied, particularly at high radio frequ…
Revisiting the distance to radio Loops I and IV using Gaia and radio/optical polarization data
G. V. Panopoulou, C. Dickinson, A. C. S. Readhead +2
Galactic synchrotron emission exhibits large-angular-scale features known as radio spurs and loops. Determining the physical size of these structures is important for understanding…
The Relativistic Jet Orientation and Host Galaxy of the Peculiar Blazar PKS 1413+135
A. C. S. Readhead, V. Ravi, I. Liodakis +26
PKS 1413+135 is one of the most peculiar blazars known. Its strange properties led to the hypothesis almost four decades ago that it is gravitationally lensed by a mass concentrati…
Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS
R. Cepeda-Arroita, S. Harper, C. Dickinson +32
Anomalous Microwave Emission (AME) is a significant component of Galactic diffuse emission in the frequency range -GHz and a new window into the properties of sub-nanomet…
Resolved observations at 31 GHz of spinning dust emissivity variations in Oph
Carla Arce-Tord, Matias Vidal, Simon Casassus +9
The Oph molecular cloud is one of the best examples of spinning dust emission, first detected by the Cosmic Background Imager (CBI). Here we present 4.5 arcmin observations wit…
The presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazars
J. Y. Koay, D. L. Jauncey, T. Hovatta +8
We have conducted the first systematic search for interday variability in a large sample of extragalactic radio sources at 15 GHz. From the sample of 1158 radio-selected blazars mo…
MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-Loud Blazars
M. L. Lister, D. C. Homan, T. Hovatta +8
We present results from a parsec-scale jet kinematics study of 409 bright radio-loud AGNs based on 15 GHz VLBA data obtained between 1994 August 31 and 2016 December 26 as part of…
An Ammonia Spectral Map of the L1495-B218 Filaments in the Taurus Molecular Cloud: II CCS & HCN Chemistry and Three Modes of Star Formation in the Filaments
Young Min Seo, Liton Majumdar, Paul F. Goldsmith +22
We present deep CCS and HCN observations of the L1495-B218 filaments in the Taurus molecular cloud obtained using the K-band focal plane array on the 100m Green Bank Telescope.…
The C-Band All-Sky Survey (C-BASS): Constraining diffuse Galactic radio emission in the North Celestial Pole region
C. Dickinson, A. Barr, H. C. Chiang +17
The C-Band All-Sky Survey C-BASS is a high-sensitivity all-sky radio survey at an angular resolution of 45 arcmin and a frequency of 4.7 GHz. We present a total intensity 4.7 GHz m…
Demonstration of magnetic field tomography with starlight polarization towards a diffuse sightline of the ISM
Georgia V. Panopoulou, Konstantinos Tassis, Raphael Skalidis +7
The availability of large datasets with stellar distance and polarization information will enable a tomographic reconstruction of the (plane-of-the-sky-projected) interstellar magn…
The State-of-Play of Anomalous Microwave Emission (AME) Research
Clive Dickinson, Y. Ali-Haïmoud, A. Barr +30
Anomalous Microwave Emission (AME) is a component of diffuse Galactic radiation observed at frequencies in the range -60 GHz. AME was first detected in 1996 and recogni…
37 GHz observations of narrow-line Seyfert 1 galaxies
A. Lähteenmäki, E. Järvelä, T. Hovatta +12
Observations at 37 GHz, performed at Metsähovi Radio Observatory, are presented for a sample of 78 radio-loud and radio-quiet narrow-line Seyfert 1 (NLS1) galaxies, together with a…
The peculiar light-curve of J1415+1320: A case study in extreme scattering events
H. K. Vedantham, A. C. S. Readhead, T. Hovatta +12
The radio light-curve of J1415+1320 (PKS 1413+135) shows time-symmetric and recurring U-shaped features across the cm-wave and mm-wave bands. The symmetry of these features points…