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The SNR candidate MF83 in M101 is coincident with a very luminous X-ray source. Based on the high X-ray luminosity, it has been suggested that MF83 is a "hypernova remnant" requiring an explosion energy about two orders of magnitude higher…

Astrophysics · Physics 2009-10-31 Shih-Ping Lai , You-Hua Chu , C. H. Rosie Chen , Robin Ciardullo , Eva K. Grebel

We present a study of the HII region Sh2-205 and its environs, based on data obtained from the CGPS, 12CO observations, and MSX data. We find that Sh2-205 can be separated in three independent optical structures: SH 149.25-0.0, SH…

Astrophysics · Physics 2009-11-13 G. A. Romero , C. E. Cappa

We present the results of a detailed investigation into the physical conditions in interstellar material interacting with the supernova remnant IC 443. Our analysis is based on a comprehensive examination of high-resolution far-ultraviolet…

This work aims at improving the current understanding of the interaction between H ii regions and turbulent molecular clouds. We propose a new method to determine the age of a large sample of OB associations by investigating the development…

Solar and Stellar Astrophysics · Physics 2014-09-05 P. Tremblin , L. D. Anderson , P. Didelon , A. C. Raga , V. Minier , E. Ntormousi , A. Pettitt , C. Pinto , M. Samal , N. Schneider , A. Zavagno

Mass outflow generated by the dynamical feedback from massive stars is currently a topic of high interest. Using a purpose-developed analysis technique, and taking full advantage of the high kinematic and angular resolution of our…

We conducted observations and analyses of the molecular cloud, N4, which is located at ~40 pc from SS433 and the same line of sight as that of the radio shell, in 12CO(J=1-0), 12CO(J=3-2), 13CO(J=3-2), and grand-state OH emissions.N4 has a…

Astrophysics of Galaxies · Physics 2022-03-30 Hiroaki Yamamoto , Ryuji Okamoto , Yasuhiro Murata , Hiroyuki Nakanishi , Hiroshi Imai , Kohei Kurahara

We study the Large Magellanic Cloud HII region N 214C using imaging and spectroscopy obtained at the ESO New Technology Telescope. On the basis of the highest resolution images so far obtained of the OB association LH 110, we show that the…

Astrophysics · Physics 2008-11-26 Frederic Meynadier , Mohammad Heydari-Malayeri , Nolan Walborn

We report the discovery of very high latitude molecular gas in the edge-on spiral galaxy, NGC 5775. Emission from both the J=1-0 and 2-1 lines of 12CO is detected up to 4.8 kpc away from the mid-plane of the galaxy. NGC 5775 is known to…

Astrophysics · Physics 2009-11-07 S. -W. Lee , E. R. Seaquist , S. Leon , S. Garcia-Burillo , J. A. Irwin

This work aims at investigating the molecular gas component in the vicinity of two young stellar object (YSO) candidates identified at the border of the HII region G034.8-0.7 that is evolving within a molecular cloud shocked by the SNR W44.…

Astrophysics of Galaxies · Physics 2015-05-13 S. Paron , M. E. Ortega , M. Rubio , G. Dubner

We present the results of HI 21-cm line observations to explore the nature of the high-velocity (HV) HI gas at l ~ 173{\circ} . In low-resolution Hi surveys this HV gas appears as faint, wing-like, HI emission that extends to velocities…

Astrophysics of Galaxies · Physics 2015-06-03 Ji-hyun Kang , Bon-Chul Koo , Chris Salter

The Galactic HII region G353.2+0.9 is excited by the massive open cluster Pismis-24. By analyzing (sub-)mm molecular-line and -continuum we study the detailed morphology of the gas and dust, as well as their physical parameters and their…

Astrophysics of Galaxies · Physics 2015-06-03 A. Giannetti , J. Brand , F. Massi , A. Tieftrunk , M. T. Beltran

We started a multi-scale analysis of G202.3+2.5, an intertwined filamentary region of Monoceros OB1. In Paper I, we examined the distributions of dense cores and protostars and found enhanced star formation (SF) activity in the junction…

The spatial distribution of the HI gas in galaxies holds important clues on the physical processes that shape the structure and dynamics of the interstellar medium (ISM). In this work, we quantify the structure of the HI gas in a sample of…

We present results obtained towards the HII regions N159, N166, and N132 from the emission of several molecular lines in the 345 GHz window. Using ASTE we mapped a 2.4' $\times$ 2.4' region towards the molecular cloud N159-W in the…

Astrophysics of Galaxies · Physics 2015-11-11 S. Paron , M. E. Ortega , C. Fariña , M. Cunningham , P. A. Jones , M. Rubio

We present a multi-wavelength study of the IR bubble G24.136+00.436. The J=1-0 observations of $^{12}$CO, $^{13}$CO and C$^{18}$O were carried out with the Purple Mountain Observatory 13.7 m telescope. Molecular gas with a velocity of 94.8…

Solar and Stellar Astrophysics · Physics 2015-06-23 Hong-Li Liu , Yuefang Wu , JinZeng Li , Jing-Hua Yuan , Tie Liu , Xiaoyi Dong

We report an observational study of the Galactic HII region Sh 2-305/S305 using the [CII] 158 $\mu$m line data, which are used to examine the gas dynamics and structure of photodissociation regions. The integrated [CII] emission map at…

Astrophysics of Galaxies · Physics 2021-12-08 N. K. Bhadari , L. K. Dewangan , P. M. Zemlyanukha , D. K. Ojha , I. I. Zinchenko , Saurabh Sharma

The Local and Loop I superbubbles are the closest and best investigated supernova (SN) generated bubbles and serve as test laboratories for observations and theories of the interstellar medium. Since the morphology and dynamical evolution…

Astrophysics · Physics 2009-11-11 Dieter Breitschwerdt , Miguel A. de Avillez

We report the serendipitous discovery of a large HI cloud with an associated HI mass of $6(\pm1.5)\times 10^9 h^{-2}$ M$_\odot$ and a heliocentric velocity 8800 \kms, located near the periphery of the cluster of galaxies Abell 2634. Its…

We observed the classical interacting galaxy M51 with FAST and obtain high sensitivity HI image with column density down to 3.8 $\times$ 10$^{18}$ cm$^{-2}$. In the image we can see a diffuse extended envelope around the system and several…

Astrophysics of Galaxies · Physics 2023-02-15 Haiyang Yu , Ming Zhu , Jin-Long Xu , Mei Ai , Peng Jiang , Yanbin Yang

Young HII regions are an important site to study O star formation based on distributions of ionized and molecular gas. We revealed that two molecular clouds at $\sim 48$ km s$^{-1}$ and $\sim 53$ km s$^{-1}$ are associated with the HII…