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14 papers · 2 filters
Instability of counter-rotating stellar disks
Robert G. Hohlfeld, Richard V. E. Lovelace
We use an N-body simulation, constructed using GADGET-2, to investigate an accretion flow onto an astrophysical disk that is in the opposite sense to the disk's rotation. In order…
Extragalactic Jets as Probes of Distant Clusters of Galaxies and the Clusters Occupied by Bent Radio AGN (COBRA) Survey
Elizabeth L. Blanton, Rachel Paterno-Mahler, Joshua D. Wing +6
We are conducting a large survey of distant clusters of galaxies using radio sources with bent jets and lobes as tracers. These radio sources are driven by AGN and achieve their be…
Probing the Parsec-scale Accretion Flow of 3C 84 with Millimeter Polarimetry
R. L. Plambeck, G. C. Bower, Ramprasad Rao +6
We report the discovery of Faraday rotation toward radio source 3C 84, the active galactic nucleus in NGC1275 at the core of the Perseus Cluster. The rotation measure (RM), determi…
Absorption Filaments Towards the Massive Clump G0.253+0.016
John Bally, J. M. Rathborne, S. N. Longmore +11
ALMA HCO+ observations of the infrared dark cloud G0.253+0.016 located in the Central Molecular Zone of the Galaxy are presented. The 89 GHz emission is area-filling, optically thi…
Spatially Resolved Magnetic Field Structure in the Disk of a T Tauri Star
Ian W. Stephens, Leslie W. Looney, Woojin Kwon +6
Magnetic fields in accretion disks play a dominant role during the star formation process but have hitherto been observationally poorly constrained. Field strengths have been infer…
Turbulence sets the initial conditions for star formation in high-pressure environments
J. M. Rathborne, S. N. Longmore, J. M. Jackson +9
Despite the simplicity of theoretical models of supersonically turbulent, isothermal media, their predictions successfully match the observed gas structure and star formation activ…
The Bones of the Milky Way
Alyssa A. Goodman, Joao Alves, Christopher N. Beaumont +8
The very long and thin infrared dark cloud "Nessie" is even longer than had been previously claimed, and an analysis of its Galactic location suggests that it lies directly in the…
Panchromatic Hubble Andromeda Treasury IX: A Photometric Survey of Planetary Nebulae in M31
Mark J. Veyette, Benjamin F. Williams, Julianne J. Dalcanton +8
We search Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) broadband imaging data from the Panchromatic Hubble Andromeda Treasury (PHAT…
The Magnetic Field of Cloud 3 in L204
Lauren R. Cashman, D. P. Clemens
The L204 dark cloud complex is a nearby filamentary structure in Ophiuchus North that has no signs of active star formation. Past studies show that L204 is interacting with the nea…
Distributed Low-Mass Star Formation in the IRDC G34.43+00.24
Jonathan B. Foster, Héctor G. Arce, Marc Kassis +9
We have used deep near-infrared observations with adaptive optics to discover a distributed population of low-mass protostars within the filamentary Infrared Dark Cloud G34.43+00.2…
Evidence of internal rotation and a helical magnetic field in the jet of the quasar NRAO150
Sol N. Molina, Iván Agudo, José L. Gómez +3
The source NRAO150 is a very prominent millimeter to radio emitting quasar at redshift z=1.52 for which previous millimeter VLBI observations revealed a fast counterclockwise rotat…
Near-Infrared Polarimetry of the Edge-On Galaxy NGC891
Jordan D. Montgomery, Dan P. Clemens
The edge-on galaxy NGC 891 was probed using near-infrared (NIR) imaging polarimetry in the H-band (1.6 um) with the Mimir instrument on the 1.8 m Perkins Telescope. Polarization wa…
G0.253+0.016: A centrally condensed, high-mass protocluster
J. M. Rathborne, S. N. Longmore, J. M. Jackson +9
Despite their importance as stellar nurseries and the building blocks of galaxies, very little is known about the formation of the highest mass clusters. The dense clump G0.253+0.0…
The First Simultaneous 3.5 and 1.3mm Polarimetric Survey of Active Galactic Nuclei in the Northern Sky
I. Agudo, C. Thum, J. L. Gomez +1
Short millimeter observations of radio-loud AGN offer the opportunity to study the physics of their inner relativistic jets, from where the bulk millimeter emission is radiated. Mi…