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Understanding the initial properties of star-forming material and how they affect the star formation process is key. From an observational point of view, the feedback from young high-mass stars on future star formation properties is still…

In this paper we measure the far-infrared (FIR) and radio flux densities of a sample of 82 local gas-rich galaxies, including 70 "dwarf" galaxies ($M_* < 10^9 M_\odot$), from the Local Volume HI Survey (LVHIS), which is close to volume…

星系天体物理 · 物理学 2018-07-04 Li Shao , Baerbel Koribalski , Jing Wang , Luis Ho , Lister Staveley-Smith

Context: In the last years, there have been many studies on the omnipresence and structures of filaments in star-forming regions, as well as their role in the process of star formation. Those filaments are normally identified as elongated…

星系天体物理 · 物理学 2016-08-10 R. -A. Chira , R. Siebenmorgen , Th. Henning , J. Kainulainen

The radio and far-infrared luminosities of star-forming galaxies are tightly correlated over several orders of magnitude; this is known as the far-infrared radio correlation (FIRC). Previous studies have shown that a host of factors…

Using high-resolution data from the Galactic Arecibo L-Band Feed Array HI (GALFA-HI) survey, we show that linear structure in Galactic neutral hydrogen (HI) correlates with the magnetic field orientation implied by Planck 353 GHz polarized…

宇宙学与河外天体物理 · 物理学 2015-12-16 S. E. Clark , J. Colin Hill , J. E. G. Peek , M. E. Putman , B. L. Babler

Filaments stand as pivotal structures within the cosmic web. However, direct detection of the cold gas content of the filaments remains challenging due to its inherent low brightness temperature. With the TNG hydrodynamical simulations, we…

宇宙学与河外天体物理 · 物理学 2025-04-10 Diyang Liu , Yichao Li , Denis Tramonte , Furen Deng , Jiaxin Wang , Yougang Wang , Xin Zhang , Xuelei Chen

We investigate the physical properties of structures seen in channel map observations of 21-cm neutral hydrogen (HI) emission. HI intensity maps display prominent linear structures that are well aligned with the ambient magnetic field in…

星系天体物理 · 物理学 2019-04-11 S. E. Clark , J. E. G. Peek , M. -A. Miville-Deschênes

Aims: We resolve the length-scales for filament formation and fragmentation (res. <=0.1pc), in particular the Jeans length and cylinder fragmentation scale. Methods: We observed the prototypical high-mass star-forming filament IRDC18223…

星系天体物理 · 物理学 2015-11-25 H. Beuther , S. E. Ragan , K. Johnston , Th. Henning , A. Hacar , J. T. Kainulainen

Recent observations have identified hub-filament systems (HFSs) as the primary formation sites of massive stars and star clusters. Some HFSs are characterized by multiple filaments aligned radially toward a central high-density hub.…

星系天体物理 · 物理学 2026-03-04 Shingo Nozaki , Shu-ichiro Inutsuka

Recent \herschel\ and \planck\ observations of submillimeter dust emission revealed the omnipresence of filamentary structures in the interstellar medium (ISM). The ubiquity of filaments in quiescent clouds as well as in star-forming…

星系天体物理 · 物理学 2017-12-05 Doris Arzoumanian

In order to investigate the contribution of diffuse components to their total HI emission, we have obtained high precision HI line flux densities with the 100m Green Bank Telescope for a sample of 100 isolated spiral and irregular galaxies…

天体物理学 · 物理学 2008-11-26 David E. Hogg , Morton S. Roberts , Martha P. Haynes , Ronald J. Maddalena

Hub-filament systems (HFSs) play an important role in the formation of massive stars and star clusters. Although the velocity structures along dense filaments have been studied, the gas kinematics in the low density inter-filament regions…

Filaments are considered to be basic structures and molecular clouds consist of filaments. Filaments are often observed as extending in the direction perpendicular to the interstellar magnetic field. The structure of filaments has been…

星系天体物理 · 物理学 2015-05-13 Kohji Tomisaka

We conducted a follow-up study on the analysis of the LOw Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) mosaic in the high-latitude outer Galaxy presented in the first paper of this series. Here, we focus on the search for alignment…

星系天体物理 · 物理学 2024-07-10 Ana Erceg , Vibor Jelić , Marijke Haverkorn , Andrea Bracco , Lana Ceraj , Luka Turić , Juan D. Soler

The recent data collected by {\it Herschel} have confirmed that interstellar structures with filamentary shape are ubiquitously present in the Milky Way. Filaments are thought to be formed by several physical mechanisms acting from the…

The faint 21 cm signal emitted by neutral hydrogen in cosmic filaments is expected to be detectable. However, due to its weakness, stacking techniques are required. We assessed two stacking methods--pair stacking and filament…

宇宙学与河外天体物理 · 物理学 2026-05-11 Yuxi Meng , Jie Wang , Yingjie Jing , Hongxiang Chen , Zerui Liu

We built a multi-wavelength dataset for galaxies from the Local Volume HI Survey (LVHIS), which comprises 82 galaxies. We also select a sub-sample of ten large galaxies for investigating properties in the galactic outskirts. The LVHIS…

Filament G37 exhibits a distinctive "caterpillar" shape, characterized by two semicircular structures within its 40\,pc-long body, providing an ideal target to investigate the formation and evolution of filaments. By analyzing multiple…

星系天体物理 · 物理学 2025-04-30 Mengke Zhao , Xindi Tang , Keping Qiu , Yuxin He , Dalei Li

Filaments which form either between or around active regions (ARs) are called intermediate filaments. In spite of various theoretical studies, the origin of the chirality of filaments is still uncovered. We investigated how intermediate…

太阳与恒星天体物理 · 物理学 2011-02-11 Eun-Kyung Lim , Jongchul Chae

Using IRAM 30m, SEST 15m, and Nancay radiotelescopes, we have gathered the 1mm continuum emission, spectra of the J=1--0 CO line and of the HI line at 21cm for two samples of IRAS galaxies. Using these data, we have estimated the HI masses,…

天体物理学 · 物理学 2016-08-30 Paola Andreani , Fabienne Casoli , Maryvonne Gerin