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Related papers: Molecular cloud distance determination from deep N…

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We want to estimate the distance to molecular clouds in the solar vicinity in a statistically precise way. Clouds are recognized as extinction discontinuities. The extinction is estimated from the $(H-K) \ vs. \ (J-H)$ diagram and distances…

Astrophysics of Galaxies · Physics 2010-06-21 Jens Knude

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

Distance measurements to molecular clouds are essential and important. We present directly measured distances to 169 molecular clouds in the fourth quadrant of the Milky Way. Based on the near-infrared photometry from the Two Micron All Sky…

Astrophysics of Galaxies · Physics 2020-08-05 Chen Bingqiu , Wang Shu , Hou Ligang , Yang Yihong , Li Zhiwen , Zhao He , Biwei Jiang

We test two different methods of using near-infrared extinction to estimate distances to dark clouds in the first quadrant of the Galaxy using large near infrared (2MASS and UKIDSS) surveys. VLBI parallax measurements of masers around…

Astrophysics of Galaxies · Physics 2015-06-04 Jonathan B. Foster , Joseph J. Stead , Robert A. Benjamin , Melvin G. Hoare , James M. Jackson

We present a large catalogue of molecular clouds with accurate distance estimates in the southern sky. Based on the three-dimensional (3D) dust extinction map and the best-fit extinction and distance information of over 17 million stars…

Astrophysics of Galaxies · Physics 2022-02-23 Helong Guo , Bingqiu Chen , Xiaowei Liu

We report the distances of molecular clouds at high Galactic latitudes (|b|>10$^\circ$) derived from parallax and G band extinction (A$_{\rm G}$) measurements in the second Gaia data release, Gaia DR2. Aided by Bayesian analyses, we…

Astrophysics of Galaxies · Physics 2019-04-03 Qing-Zeng Yan , Bo Zhang , Ye Xu , Sufen Guo , J. P. Macquart , Zheng-Hong Tang , A. J. Walsh

We are studying the column density distribution of all nearby giant molecular clouds. As part of this project we generated several all sky extinction maps. They are calculated using the median near infrared colour excess technique applied…

Astrophysics of Galaxies · Physics 2009-11-13 J. Rowles , D. Froebrich

Machine learning has been successfully applied in varied field but whether it is a viable tool for determining the distance to molecular clouds in the Galaxy is an open question. In the Galaxy, the kinematic distance is commonly employed as…

We present distances to 76 medium-sized molecular clouds and an extra large-scale one in the second Galactic quadrant ($104.75^\circ <l<150.25^\circ $ and $|b|<5.25^\circ$), 73 of which are accurately measured for the first time. Molecular…

Astrophysics of Galaxies · Physics 2021-02-03 Qing-Zeng Yan , Ji Yang , Yan Sun , Yang Su , Ye Xu , Hongchi Wang , Xin Zhou , Chen Wang

The principle of the background-eliminated extinction-parallax (BEEP) method is examining the extinction difference between on- and off-cloud regions to reveal the extinction jump caused by molecular clouds, thereby revealing the distance…

Astrophysics of Galaxies · Physics 2021-11-24 Qing-Zeng Yan , Ji Yang , Yang Su , Yan Sun , Ye Xu , Hongchi Wang , Xin Zhou , Chen Wang

We present a new method of calculating distances of molecular clouds in the Galactic plane, using CO observations and the Gaia DR2 parallax and G-band extinction ($A_G$) measurements. Due to the complexity of dust environments in the…

Astrophysics of Galaxies · Physics 2019-11-05 Qing-Zeng Yan , Ji Yang , Yan Sun , Yang Su , Ye Xu

Knowledge of the three-dimensional structure of Galactic molecular clouds is important for understanding how clouds are affected by processes such as turbulence and magnetic fields and how this structure effects star formation within them.…

Aims: We aim to develop a method to determine distances to molecular clouds using JHK near-infrared photometry. Methods: The method is based on a technique that aids spectral classification of stars lying towards the fields containing the…

Astrophysics of Galaxies · Physics 2010-11-11 G. Maheswar , C. -W. Lee , H. C. Bhatt , S. V. Mallik , Sami Dib

Accurate distances to local molecular clouds are critical for understanding the star and planet formation process, yet distance measurements are often obtained inhomogeneously on a cloud-by-cloud basis. We have recently developed a method…

Distance measurements to molecular clouds are important, but are often made separately for each cloud of interest, employing very different different data and techniques. We present a large, homogeneous catalog of distances to molecular…

Determining star cluster distances is essential to analyse their properties and distribution in the Galaxy. In particular it is desirable to have a reliable, purely photometric distance estimation method for large samples of newly…

Astrophysics of Galaxies · Physics 2015-06-17 Anne S. M. Buckner , Dirk Froebrich

We present a uniform catalog of accurate distances to local molecular clouds informed by the Gaia DR2 data release. Our methodology builds on that of Schlafly et al. (2014). First, we infer the distance and extinction to stars along…

3D tomography of the interstellar dust and gas may be useful in many respects, from the physical and chemical evolution of the ISM itself to foreground decontamination of the CMB, or various studies of the environments of specific objects.…

Astrophysics of Galaxies · Physics 2015-05-18 Jean-Luc Vergely , Bernard Valette , Rosine Lallement , Severine Raimond

We present a large, homogeneous catalogue of molecular clouds within 4 kpc from the Sun at low Galactic latitudes ($|b|$ $<$ 10\degr) with unprecedented accurate distance determinations. Based on the three-dimensional dust reddening map and…

Astrophysics of Galaxies · Physics 2020-02-12 B. -Q. Chen , G. -X. Li , H. -B. Yuan , Y. Huang , Z. -J. Tian , H. -F. Wang , H. -W. Zhang , C. Wang , X. -W. Liu

Context: Infrared Dark Clouds (IRDCs) harbor progenitors of high-mass stars. Little is known of the parental molecular clouds of the IRDCs. Aims: We demonstrate the feasibility of the near-infrared (NIR) dust extinction mapping in tracing…

Astrophysics of Galaxies · Physics 2015-05-30 J. Kainulainen , J. Alves , H. Beuther , T. Henning , F. Schuller
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