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Implications of evaporative cooling by H for 1I/`Oumuamua
Thiem Hoang, Abraham Loeb
The first interstellar object observed in our solar system, 1I/`Oumuamua, exhibited several peculiar properties, including extreme elongation and non-gravitational acceleration. Be…
Effects of Barnett magnetic dipole-dipole interaction on grain growth and destruction
Thiem Hoang, Bao Truong
Rapidly spinning magnetic grains can acquire large magnetic dipole moments due to the Barnett effect. Here we study the new effect of Barnett magnetic dipole-dipole interaction on…
Internal and external alignment of carbonaceous grains within the radiative torque paradigm
Thiem Hoang, Vo Hong Minh Phan, Le Ngoc Tram
We study the internal and external alignment of carbonaceous grains, including graphite and hydrogenated amorphous carbon (HAC), in the interstellar medium (ISM) within the RAdiati…
The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333
Yasuo Doi, Kohji Tomisaka, Tetsuo Hasegawa +33
We investigate the internal 3D magnetic structure of dense interstellar filaments within NGC 1333 using polarization data at from the -fields In STar-forming R…
On planet formation around supermassive black holes and the grain disruption barriers by radiative torques
Nguyen Chau Giang, Thiem Hoang, Le Ngoc Tram +5
It has recently been suggested that planets can form by dust coagulation in the torus of active galactic nuclei (AGN) with low luminosity of $L_{\rm bol}\lesssim 10^{42} erg s^{-1}…
Erosion of Icy Interstellar Objects by Cosmic Rays and Implications for `Oumuamua
Vo Hong Minh Phan, Thiem Hoang, Abraham Loeb
We study the destruction and modification of icy interstellar objects by cosmic rays and gas collisions. Using the cosmic-ray flux measured in the local interstellar medium as well…
The JCMT BISTRO Survey: An 850/450m Polarization Study of NGC 2071IR in OrionB
A-Ran Lyo, Jongsoo Kim, Sarah Sadavoy +143
We present the results of simultaneous 450 m and 850 m polarization observations toward the massive star forming region NGC 2071IR, a target of the BISTRO (B-fields in Star-F…
Effects of grain alignment with magnetic fields on grain growth and the structure of dust aggregates
Thiem Hoang
Dust grains drift through the interstellar medium (ISM) and are aligned with the magnetic field. Here we study the effect of grain alignment and grain motion on grain growth in mol…
Effect of dust rotational disruption by radiative torques on radiation pressure feedback from massive protostars
Thiem Hoang
Radiation pressure on dust is thought to play a crucial role in the formation process of massive stars by acting against gravitational collapse onto the central protostar. However,…
SOFIA observations of 30 Doradus: I -- Far-Infrared dust polarization and implications for grain alignment and disruption by radiative torques
Le Ngoc Tram, Thiem Hoang, Enrique Lopez-Rodriguez +7
Located in the Large Magellanic cloud and mostly irradiated by a massive-star cluster R136, 30 Doradus is an ideal target to test the leading theory of the grain alignment and…
The JCMT BISTRO-2 Survey: The Magnetic Field in the Center of the Rosette Molecular Cloud
Vera Könyves, Derek Ward-Thompson, Kate Pattle +33
We present the first 850 m polarization observations in the most active star-forming site of the Rosette Molecular Cloud (RMC, 1.6 kpc) in the wall of the Rosette Nebula,…
The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths towards the OMC-1 Region
Jihye Hwang, Jongsoo Kim, Kate Pattle +34
Measurement of magnetic field strengths in a molecular cloud is essential for determining the criticality of magnetic support against gravitational collapse. In this paper, as part…
Revealing the diverse magnetic field morphologies in Taurus dense cores with sensitive sub-millimeter polarimetry
Chakali Eswaraiah, Di Li, Ray S. Furuya +142
We have obtained sensitive dust continuum polarization observations at 850 m in the B213 region of Taurus using POL-2 on SCUBA-2 at the James Clerk Maxwell Telescope (JCMT), as…
Observations of magnetic fields surrounding LkH 101 taken by the BISTRO survey with JCMT-POL-2
Nguyen Bich Ngoc, Pham Ngoc Diep, Harriet Parsons +146
We report the first high spatial resolution measurement of magnetic fields surrounding LkH 101, a part of the Auriga-California molecular cloud. The observations were taken with…
JCMT POL-2 and BISTRO Survey observations of magnetic fields in the L1689 molecular cloud
Kate Pattle, Shih-Ping Lai, James Di Francesco +26
We present 850m polarization observations of the L1689 molecular cloud, part of the nearby Ophiuchus molecular cloud complex, taken with the POL-2 polarimeter on the James Clerk…
Variation of dust properties with cosmic time implied by radiative torque disruption
Thiem Hoang
Dust properties within a galaxy are known to change from the diffuse medium to dense clouds due to increased local gas density. However, the question of whether dust properties cha…
Probing Interstellar Grain Growth Through Polarimetry in the Taurus Cloud Complex
John E. Vaillancourt, B-G Andersson, Dan P. Clemens +4
The optical and near-infrared (OIR) polarization of starlight is typically understood to arise from the dichroic extinction of that light by dust grains whose axes are aligned with…
Grain alignment and disruption by radiative torques in dense molecular clouds and implication for polarization holes
Thiem Hoang, Le Ngoc Tram, Hyeseung Lee +2
Dust polarization induced by aligned grains is widely used to study magnetic fields in various environments, including star-forming regions. However, the question of to what optica…
Alignment and rotational disruption of dust
A. Lazarian, Thiem Hoang
We reveal a deep connection between alignment of dust grains by RAdiative torques (RATs) and MEchanical Torques (METs) and rotational disruption of grains introduced by Hoang et al…
Modelling Grain Rotational Disruption by Radiative Torques and Extinction of Active Galactic Nuclei
Nguyen Chau Giang, Thiem Hoang
Extinction curves observed toward individual Active Galactic Nuclei (AGN) usually show a steep rise toward far-ultraviolet (FUV) wavelengths and can be described by the Small Magel…
Observational evidence for rotational desorption of Complex Molecules by radiative torques from Orion BN/KL
Le Ngoc Tram, Hyeseung Lee, Thiem Hoang +5
Complex Organic Molecules (COMs) are believed to form in the ice mantle of dust grains and are released to the gas by thermal sublimation when grain mantles are heated to temperatu…
The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
Yasuo Doi, Tetsuo Hasegawa, Ray S. Furuya +135
We present new observations of the active star-formation region NGC 1333 in the Perseus molecular cloud complex from the James Clerk Maxwell Telescope B-Fields In Star-forming Regi…
Rotational Disruption of Astrophysical Dust and Ice: Theory and Applications
Thiem Hoang
Dust is an essential component of the interstellar medium (ISM) and plays an important role in many different astrophysical processes and phenomena. Traditionally, dust grains are…
Understanding polarized dust emission from Ophiuchi A in light of grain alignment and disruption by radiative torques
Le Ngoc Tram, Thiem Hoang, Hyeseung Lee +5
The alignment of dust grains with the ambient magnetic field produces polarization of starlight as well as thermal dust emission. Using the archival SOFIA/HAWC+ polarimetric data o…