Showing 2017 · astro-ph.GAShow all

13 papers · 2 filters

astro-ph.GA2017★ 4 cited

Carbon Monoxide Observations Toward Star Forming Regions in the Outer Scutum-Centaurus Spiral Arm

Trey V. Wenger, Asad A. Khan, Nicholas G. Ferraro +4

The Outer Scutum-Centaurus arm (OSC) is the most distant molecular spiral arm known in the Milky Way. The OSC may be the very distant end of the well-known Scutum-Centaurus arm, wh…

astro-ph.GA2017★ 365 cited

Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program

Svetlana G. Jorstad, Alan P. Marscher, Daria A. Morozova +10

We analyze the parsec-scale jet kinematics from 2007 June to 2013 January of a sample of -ray bright blazars monitored roughly monthly with the Very Long Baseline Array at 43~GH…

astro-ph.GA2017★ 54 cited

Star formation in a high-pressure environment: An SMA view of the Galactic centre dust ridge

D. L. Walker, S. N. Longmore, Q. Zhang +14

The star formation rate in the Central Molecular Zone (CMZ) is an order of magnitude lower than predicted according to star formation relations that have been calibrated in the dis…

astro-ph.GA2017★ 50 cited

A Green Bank Telescope Survey of Large Galactic HII Regions

L. D. Anderson, W. P. Armentrout, Matteo Luisi +3

As part of our ongoing HII Region Discovery Survey (HRDS), we report the Green Bank Telescope detection of 148 new angularly-large Galactic HII regions in radio recombination line…

astro-ph.GA2017★ 21 cited

M0.20-0.033: An Expanding Molecular Shell in the Galactic Center Radio Arc

Natalie Butterfield, Cornelia Lang, Mark Morris +2

We present high-frequency Karl G. Jansky Very Large Array (VLA) continuum and spectral line (NH3, H64, and H63) observations of the Galactic Center Radio Arc region, covering…

astro-ph.GA2017★ 27 cited

Multi-wavelength Stellar Polarimetry of the Filamentary Cloud IC5146: I. Dust Properties

Jia-Wei Wang, Shih-Ping Lai, C. Eswaraiah +3

We present optical and near-infrared stellar polarization observations toward the dark filamentary clouds associated with IC5146. The data allow us to investigate the dust properti…

astro-ph.GA2017★ 11 cited

Diffuse Ionized Gas in the Milky Way Disk

Matteo Luisi, L. D. Anderson, Dana S. Balser +2

We analyze the diffuse ionized gas (DIG) in the first Galactic quadrant from l=18deg to 40deg using radio recombination line (RRL) data from the Green Bank Telescope. These data al…

astro-ph.GA2017★ 43 cited

Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron II. Observations of 3C 273 at minimum activity

G. Bruni, J. L. Gómez, C. Casadio +18

RadioAstron is a 10 m orbiting radio telescope mounted on the Spektr-R satellite, launched in 2011, performing Space Very Long Baseline Interferometry (SVLBI) observations supporte…

astro-ph.GA2017★ 14 cited

The Southern HII Region Discovery Survey (SHRDS): Pilot Survey

C. Brown, C. Jordan, John M. Dickey +7

The Southern HII Region Discovery Survey (SHRDS) is a survey of the third and fourth quadrants of the Galactic plane that will detect radio recombination line and continuum emissio…

astro-ph.GA2017★ 18 cited

High-Mass Star Formation in the Outer Scutum-Centaurus Arm

W. P. Armentrout, L. D. Anderson, Dana S. Balser +3

The Outer Scutum-Centaurus (OSC) spiral arm is the most distant molecular spiral arm in the Milky Way, but until recently little was known about this structure. Discovered by Dame…

astro-ph.GA2017★ 19 cited

Radio and optical intra-day variability observations of five blazars

X. Liu, P. P. Yang, J. Liu +23

We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations of five blazars (3C66A, S5 0716+714, OJ287, B0925+504, and BL Lacertae) on Decemb…

astro-ph.GA2017★ 18 cited

Tracing the Magnetic Field of IRDC G028.2300.19 Using NIR Polarimetry

Sadia Hoq, D. P. Clemens, Andrés E. Guzmán +1

The importance of the magnetic (B) field in the formation of infrared dark clouds (IRDCs) and massive stars is an ongoing topic of investigation. We studied the plane-of-sky B fiel…

astro-ph.GA2017★ 19 cited

Hot Molecular Gas in the Circumnuclear Disk

E. A. C. Mills, A. Togi, M. Kaufman

We present an analysis of archival ISO observations of pure-rotational lines of H2 in three pointings in the central 3 parsecs of the Galaxy: toward the Southwest region and Northe…