Kinematics of Ultra-High-Velocity Gas in the Expanding Molecular Shell adjacent to the W44 Supernova Remnant

Abstract

We mapped the ultra-high-velocity feature (the "Bullet") detected in the expanding molecular shell associated with the W44 supernova remnant using the Nobeyama Radio Observatory 45-m telescope and the ASTE 10-m telescope. The Bullet clearly appears in the CO $J$=1-0, CO $J$=3-2, CO $J$=4-3, and HCO${}^{+}$ $J$=1-0 maps with a compact appearance ($0.5\times 0.8$ pc${}^2$) and an extremely broad velocity width ($\Delta V\simeq 100\mathrm{km}{\mathrm{s}}^{-1}$). The line intensities indicate that the Bullet has a higher density and temperature than those in the expanding molecular shell. The kinetic energy of the Bullet amounts to $10^{48.0}\mathrm{erg}$ which is approximately 1.5 orders of magnitude greater than the kinetic energy shared to the small solid angle of it. Two possible formation scenarios with an inactive isolated black hole (BH) are presented.

arXiv comment18 pages, 4 figures, accepted for publication in Astrophysical Journal Letters

References in corpus (11)

• A Review of Bondi--Hoyle--Lyttleton Accretion
• Polarization Observations of 1720 MHz OH Masers toward the Three Supernova Remnants W28, W44, and IC443
• The Birth of High Mass Stars: Accretion and/or Mergers?
• Shocked Molecular Gas in the Supernova Remnants W 28 and W 44: Near-infrared and millimeter-wave observations
• X-Rays from Isolated Black Holes in the Milky Way
• A Chandra Catalog of X-ray Sources in the Central 150 pc of the Galaxy
• Signature of an Intermediate-Mass Black Hole in the Central Molecular Zone of Our Galaxy
• Kinematics of Shocked Molecular Gas Adjacent to the Supernova Remnant W44
• AKARI-CAS --- Online Service for AKARI All-Sky Catalogues
• XMM-Newton Observations of Young and Energetic Pulsar J2022+3842
• Millimeter-wave Molecular Line Observations of the Tornado Nebula

Cited by in corpus (11)

• Looking at cosmic near-infrared background radiation anisotropies
• Millimetre-wave Emission from an Intermediate-Mass Black Hole Candidate in the Milky Way
• Discovery of Two Small High-Velocity Compact Clouds in the Central 10 Parsecs of Our Galaxy
• Characterizing the velocity of a wandering black hole and properties of the surrounding medium using convolutional neural networks
• An energetic high-velocity compact cloud: CO$-$0.31+0.11
• Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud
• Hoyle-Lyttleton accretion on to black hole accretion disks with super-Eddington luminosity for dusty gas
• Catalog of High Velocity Dispersion Compact Clouds in the Central Molecular Zone of Our Galaxy
• Broad-velocity-width Molecular Features in the Galactic Plane
• ALMA View of the High-velocity-dispersion Compact Cloud CO 0.02-0.02 at the Galactic Center
• Low-velocity large-scale shocks in the infrared dark cloud G035.39-00.33: bubble-driven cloud-cloud collisions