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We present high-resolution smoothed particle hydrodynamics simulations of a region of gas flowing in a spiral arm and identify dense gas clouds to investigate their kinematics with respect to a Milky Way model. We find that, on average, the…

Astrophysics of Galaxies · Physics 2017-12-27 F. G. Ramón-Fox , Ian A. Bonnell

We derive the physical properties of 580 molecular clouds based on their 12CO and 13CO line emission detected in the University of Massachusetts-Stony Brook (UMSB) and Galactic Ring surveys. We provide a range of values of the physical…

Astrophysics of Galaxies · Physics 2015-05-20 Julia Roman-Duval , James M. Jackson , Mark Heyer , Jill Rathborne , Robert Simon

Analyzing the (l, b, Vlsr) data cube of 13CO(J=1-0) line emission obtained by Bally et al, we have investigated the molecular gas distribution and kinematics in the central +/-1 deg (150 pc) region of the Galaxy. We have applied the…

Astrophysics · Physics 2008-02-03 Yoshiaki SOFUE

The Boston University-Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ring Survey (GRS) of 13 CO (1-0) emission covers Galactic longitudes 18 deg < l < 55.7 deg and Galactic latitudes |b| <= 1 deg. Using the SEQUOIA array on…

Solar and Stellar Astrophysics · Physics 2009-11-13 J. M. Rathborne , A. M. Johnson , J. M. Jackson , R. Y. Shah , R. Simon

We present the results of an unbiased $^{12}$CO/$^{13}$CO/C$^{18}$O ($J$ = 1-0) survey in a portion of the third Galactic quadrant (TGQ): $l$ = [219.75, 229.75]$^\circ$ and $b$ = [-5.25, 5.25]$^\circ$. The high-resolution and…

Astrophysics of Galaxies · Physics 2023-08-22 Yiwei Dong , Yan Sun , Ye Xu , Zehao Lin , Shuaibo Bian , Chaojie Hao , Dejian Liu , Yingjie Li , Ji Yang , Yang Su , Xin Zhou , Shaobo Zhang , Qing-Zeng Yan , Zhiwei Chen

Knowledge about the distribution of CO emission in the Milky Way is essential to understand the impact of Galactic environment on the formation and evolution of structures in the interstellar medium. However, currently our insight about the…

Astrophysics of Galaxies · Physics 2020-08-19 M. Riener , J. Kainulainen , J. D. Henshaw , H. Beuther

We present distances to 56 molecular clouds within $10\degr \leq l \leq 20\degr$ and $|b| \leq 5.25\degr$ from the Milky Way Imaging Scroll Painting (MWISP) $^{12}$CO survey, 47 of which are first-time determinations. The molecular clouds…

Astrophysics of Galaxies · Physics 2026-04-20 Juan Mei , Zhiwei Chen , Min Fang , Miaomiao Zhang , Shiyu Zhang , Zhibo Jiang

We present an expanded distance catalog for 1,710 molecular cloud structures identified in the Bolocam Galactic Plane Survey (BGPS) version 2, representing a nearly threefold increase over the previous BGPS distance catalog. We additionally…

From our catalog of Milky Way molecular clouds, created using a temperature thresholding algorithm on the Bell Laboratories 13CO Survey, we have extracted two subsets:(1) Giant Molecular Clouds (GMCs), clouds that are definitely larger than…

Astrophysics · Physics 2016-08-30 Antony A. Stark , Youngung Lee

We have identified a spiral arm lying beyond the Outer Arm in the first Galactic quadrant ~15 kpc from the Galactic center. After tracing the arm in existing 21 cm surveys, we searched for molecular gas using the CfA 1.2 meter telescope and…

Astrophysics of Galaxies · Physics 2015-05-28 T. M. Dame , P. Thaddeus

Using near infrared UKIDSS Galactic Plane Survey data, we make extinction measurements to individual stars along the same line of sight as molecular clouds. Using an existing 3D extinction map of the inner Galaxy, that provides line of…

Astrophysics of Galaxies · Physics 2015-05-18 J. J. Stead , M. G. Hoare

We investigate the use of HI data to resolve the near/far ambiguity in kinematic distances of massive young stellar object (MYSO) candidates. Kinematic distances were obtained from 13CO 1-0 spectral line observations with the Mopra…

In this paper we present the distribution of molecular gas in the Milky Way Galactic plane from $l$ = [59.75, 74.75]$^{\circ}$ and $b$ = [${-}$5.25, +5.25]$^{\circ}$, using the MWISP $^{12}$CO/$^{13}$CO/$\rm {C}^{18}{O}$ emission line data.…

Astrophysics of Galaxies · Physics 2023-08-02 Chunxue Li , Hongchi Wang , Yuehui Ma , Lianghao Lin , Yang Su , Chong Li , Yan Sun , Xin Zhou , Ji Yang

Obtaining reliable distance estimates to gas clouds within the Milky Way is challenging in the absence of certain tracers. The kinematic distance approach has been used as an alternative, derived from the assumption of circular trajectories…

We present high-resolution (~ 4") 12CO (J = 1 - 0) mapping observations with high - velocity resolution (~ 2.6 km s^{-1}) toward the disk of flocculent galaxy NGC 5055, using the Nobeyama Millimeter Array in order to study the physical…

Astrophysics · Physics 2015-06-24 Tomoka Tosaki , Yasuhiro Shioya , Nario Kuno , Kouichiro Nakanishi , Takashi Hasegawa

The Galactic edge at Galactocentric distances of 14\,--\,22\,kpc provides an ideal laboratory to study molecular clouds in an environment that is different from the solar neighborhood, due to its lower gas density, lower metallicity, and…

We have studied the properties of molecular clouds in the second quadrant of the Milky Way Mid-plane from l$=$104$.\!\!^{\circ}$75 to l$=$119$.\!\!^{\circ}$75 and b$=-$5$.\!\!^{\circ}$25 to b$=$5$.\!\!^{\circ}$25 using the $^{12}$CO,…

Astrophysics of Galaxies · Physics 2021-04-28 Yuehui Ma , Hongchi Wang , Chong Li , Lianghao Lin , Yan Sun , Ji Yang

The details of the spiral structure of the Milky Way are still debated due to large uncertainties in the distance estimates obtained through the most common tracers. X-ray dust scattering rings produced by short extragalactic X-ray…

High Energy Astrophysical Phenomena · Physics 2026-04-28 B. Vaia , I. Fornasiero , A. Tiengo , A. Bracco , V. Jelić , Ž. Bošnjak , F. Pintore , P. Esposito

Two selected regions in the molecular gas spiral arms in M51 were mapped with the Owens Valley Radio Observatory (OVRO) mm-interferometer in the 12CO(2-1), 13CO(1-0), C18O(1-0), HCN(1-0) and HCO+(1-0) emission lines. The CO data have been…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 E. Schinnerer , A. Weiss , S. Aalto , N. Z. Scoville

We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of $\mathrm{^{13}CO(J=1-0)}$ line and 104 GHz continuum emission from NGC 604, a giant HII region (GHR) in the nearby spiral galaxy M33. Our high spatial resolution…

Astrophysics of Galaxies · Physics 2021-05-12 S. P. Phiri , J. M. Kirk , D. Ward-Thompson , A. E. Sansom , G. J. Bendo
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