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Dynamics of tidal dwarf galaxies in the system Arp 72
Osvan M. Portilla-Narvaez, Javier Zaragoza-Cardiel, Gisela N. Ortiz-León +6
Some interactions between galaxies produce tidal tails primarily composed of material from their disks. Within these tails, concentrations of gas and stars can form, resembling dwa…
A global view on star formation: The GLOSTAR Galactic plane survey. XI. Radio source catalog IV: , and
S. -N. X. Medina, S. A. Dzib, J. S. Urquhart +17
The GLOSTAR survey studies star formation with the VLA and the Effelsberg 100m telescope in the Galactic plane (-2d<l<60d; |b|<1d) and the Cygnus X region with unprecedented sensit…
A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines
S. Khan, M. R. Rugel, A. Brunthaler +17
Studies of Galactic HII regions are of crucial importance for studying star formation and the evolution of the interstellar medium. Gaining an insight into their physical character…
The distance to the Serpens South Cluster from H2O masers
Gisela N. Ortiz-Leon, Sergio A. Dzib, Laurent Loinard +3
In this Letter, we report Very Long Baseline Array observations of 22 GHz water masers toward the protostar CARMA-6, located at the center of the Serpens South young cluster. From…
A Global View on Star Formation: The GLOSTAR Galactic Plane Survey V. 6.7 GHz Methanol Maser Catalogue
H. Nguyen, M. R. Rugel, C. Murugeshan +15
Class II methanol (CHOH) masers are amongst the clearest signposts of recent high-mass star formation (HMSF). A complete catalogue outlines the distribution of star formation…
Event Horizon Telescope observations of the jet launching and collimation in Centaurus A
Michael Janssen, Heino Falcke, Matthias Kadler +236
Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimeter wavelengths have the power to reveal the launching and initial collimation region of e…
A global view on star formation: The GLOSTAR Galactic plane survey III. 6.7 GHz methanol maser survey in Cygnus X
Gisela N. Ortiz-León, Karl M. Menten, Andreas Brunthaler +16
The Cygnus X complex is covered by the Global View of Star Formation in the Milky Way (GLOSTAR) survey, an unbiased radio-wavelength Galactic plane survey, in 4--8 GHz continuum ra…
A global view on star formation: The GLOSTAR Galactic Plane Survey. I. Overview and first results for the Galactic longitude range 28° < l < 36°
A. Brunthaler, K. M. Menten, S. A. Dzib +20
Surveys of the Milky Way at various wavelengths have changed our view of star formation in our Galaxy considerably in recent years. In this paper we give an overview of the GLOSTAR…
A global view on star formation: The GLOSTAR Galactic plane survey IV. Radio continuum detections of young stellar objects in the Galactic Centre region
H. Nguyen, M. R. Rugel, K. M. Menten +19
The Central Molecular Zone (CMZ), a 200 pc sized region around the Galactic Centre, is peculiar in that it shows a star formation rate (SFR) that is suppressed with respect t…
Polarimetric properties of Event Horizon Telescope targets from ALMA
Ciriaco Goddi, Ivan Marti-Vidal, Hugo Messias +31
We present the results from a full polarization study carried out with ALMA during the first VLBI campaign, which was conducted in Apr 2017 in the 3mm and 1.3mm bands, in con…
Discovery of 22 GHz Water Masers in the Serpens South Region
Gisela N. Ortiz-León, Adele Plunkett, Laurent Loinard +5
Using the Karl G. Jansky Very Large Array (VLA), we have conducted a survey for 22 GHz, 6_{1,6}-5_{2,3} H2O masers toward the Serpens South region. The masers were also observed wi…
A global view on star formation: The GLOSTAR Galactic plane survey. II. Supernova Remnants in the first quadrant of the Milky Way
Rohit Dokara, A. Brunthaler, K. M. Menten +17
Context. The properties of the population of Galactic supernova remnants (SNRs) are essential to our understanding of the dynamics of the interstellar medium (ISM) in the Milky Way…
Terahertz Water Masers: II. Further SOFIA/GREAT Detections toward Circumstellar Outflows, and a Multitransition Analysis
David A. Neufeld, Karl M. Menten, Carlos Durán +8
Following up on our discovery of terahertz water masers, reported in 2017, we report two further detections of water maser emission at frequencies above 1 THz. Using the GREAT inst…
First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
The Event Horizon Telescope Collaboration
We present the calibration and reduction of Event Horizon Telescope (EHT) 1.3mm radio wavelength observations of the supermassive black hole candidate at the center of the radio ga…
GLOSTAR -- Radio Source Catalog I: and
S. N. X. Medina, J. S. Urquhart, S. A. Dzib +18
The GLOSTAR survey will study the star formation in the Galactic plane between and with unprecedented sensitivity in both, fl…
Micro-arcsecond structure of Sagittarius A* revealed by high-sensitivity 86 GHz VLBI observations
Christiaan D. Brinkerink, Cornelia Müller, Heino D. Falcke +21
The compact radio source Sagittarius~A (Sgr~A)in the Galactic Center is the primary supermassive black hole candidate. General relativistic magnetohydrodynamical (GRMHD) si…
VLBA Observations of Strong Anisotripic Radio Scattering towards the Orion Nebula
Marina Kounkel, Lee Hartmann, Laurent Loinard +6
We present observations of VLBA 20, a radio source found towards the edge of the Orion Nebula Cluster (ONC). Nonthermal emission dominates the spectral energy distribution of this…
Asymmetric structure in Sgr A* at 3mm from closure phase measurements with VLBA, GBT and LMT
Christiaan D. Brinkerink, Cornelia Müller, Heino Falcke +19
We present the results of a closure phase analysis of 3 mm very long baseline interferometry (VLBI) measurements performed on Sagittarius A* (Sgr A*). We have analyzed observations…
VLBA determination of the distance to nearby star-forming regions VII. Monoceros R2
Sergio A. Dzib, Gisela N. Ortiz-León, Laurent Loinard +4
We present a series of sixteen Very Long Baseline Array (VLBA) high angular resolution observations of a cluster of suspected low-mass young stars in the Monoceros R2 region. Four…
The Intrinsic Shape of Sagittarius A* at 3.5-mm Wavelength
Gisela N. Ortiz-León, Michael D. Johnson, Sheperd S. Doeleman +19
The radio emission from Sgr A is thought to be powered by accretion onto a supermassive black hole of at the Galactic Center. At millimete…
The non-thermal, time-variable radio emission from Cyg OB2 # 5: A wind-collision region
Gisela Ortiz-Leon, Laurent Loinard, Luis F. Rodriguez +2
The radio emission from the well-studied massive stellar system Cyg OB2 #5 is known to fluctuate with a period of 6.7 years between a low-flux state when the emission is entirely o…