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Physical and chemical properties of Red MSX Sources in the southern sky: HII regions

We have studied the physical and chemical properties of 18 southern Red Midcourse Space Experiment Sources (RMSs), using archival data taken from the Atacama Pathfinder Experiment (APEX) Telescope Large Area Survey of the Galaxy, the…

Astrophysics of Galaxies · Physics 2017-02-16 Naiping Yu , Jun-Jie Wang , Nan Li

Chemical Abundances of OB Stars with High Projected Rotational Velocities

Elemental abundances of carbon, nitrogen, oxygen, magnesium, aluminum, and silicon are presented for a sample of twelve rapidly rotating OB star (v sin i > 60 km s^-1) members of the Cep OB2, Cyg OB3 and Cyg OB7 associations. The abundances…

Astrophysics · Physics 2009-11-07 Simone Daflon , Katia Cunha , Keith Butler , Verne V. Smith

Atomic and Molecular Absorption at High Redshift

Strong constraints on possible variations in fundamental constants can be derived from HI 21-cm and molecular rotational absorption lines observed towards quasars. With the aim of forming a statistical sample of constraints we have begun a…

Astrophysics · Physics 2016-08-16 S. J. Curran , J. K. Webb , M. T. Murphy , Y. M. Pihlström

The origin of nitrogen: Implications of recent measurements of N/O in Galactic metal-poor stars

Recent new high-precision abundance data for Galactic halo stars suggest important primary nitrogen production in very metal-poor massive stars. Here, we compute a new model for the chemical evolution of the Milky Way aimed at explaining…

Astrophysics · Physics 2009-11-10 C. Chiappini , F. Matteucci , S. K. Ballero

O18O and C18O observations of rho Oph A

Observations of the (N_J=1_1-1_0) ground state transition of O_2 with the Odin satellite resulted in a about 5 sigma detection toward the dense core rho Oph A. At the frequency of the line, 119 GHz, the Odin telescope has a beam width of…

Astrophysics of Galaxies · Physics 2015-05-14 R. Liseau , B. Larsson , L. Pagani , J. H. Black , A. Hjalmarson , K. Justtanont

A Molecular Line Survey around Orion at Low Frequencies with the MWA

The low-frequency sky may reveal some of the secrets yet to be discovered and until recently, molecules had never been detected within interstellar clouds at frequencies below 700MHz (Lovas, 2003) . Following the pilot survey towards the…

Astrophysics of Galaxies · Physics 2018-07-04 Chenoa D. Tremblay , Paul A. Jones , Maria Cunningham , Natasha Hurley-Walker , Christopher H. Jordan , Steven J. Tingay

Detection of interstellar oxidaniumyl: abundant H2O+ towards the star-forming regions DR21, Sgr B2, and NGC6334

We identify a prominent absorption feature at 1115 GHz, detected in first HIFI spectra towards high-mass star-forming regions, and interpret its astrophysical origin. The characteristic hyperfine pattern of the H2O+ ground-state rotational…

Astrophysics of Galaxies · Physics 2015-03-17 V. Ossenkopf , H. S. P. Müller , D. C. Lis , P. Schilke , T. A. Bell , S. Bruderer , E. Bergin , C. Ceccarelli , C. Comito , J. Stutzki , A. Bacman , A. Baudry , A. O. Benz , M. Benedettini , O. Berne , G. Blake , A. Boogert , S. Bottinelli , F. Boulanger , S. Cabrit , P. Caselli , E. Caux , J. Cernicharo , C. Codella , A. Coutens , N. Crimier , N. R. Crockett , F. Daniel , K. Demyk , P. Dieleman , C. Dominik , M. L. Dubernet , M. Emprechtinger , P. Encrenaz , E. Falgarone , K. France , A. Fuente , M. Gerin , T. F. Giesen , A. M. di Giorgio , J. R. Goicoechea , P. F. Goldsmith , R. Güsten , A. Harris , F. Helmich , E. Herbst , P. Hily-Blant , K. Jacobs , T. Jacq , Ch. Joblin , D. Johnstone , C. Kahane , M. Kama , T. Klein , A. Klotz , C. Kramer , W. Langer , B. Lefloch , C. Leinz , A. Lorenzani , S. D. Lord , S. Maret , P. G. Martin , J. Martin-Pintado , C. McCoey , M. Melchior , G. J. Melnick , K. M. Menten , B. Mookerjea , P. Morris , J. A. Murphy , D. A. Neufeld , B. Nisini , S. Pacheco , L. Pagani , B. Parise , J. C. Pearson , M. Pérault , T. G. Phillips , R. Plume , S. -L. Quin , R. Rizzo , M. Röllig , M. Salez , P. Saraceno , S. Schlemmer , R. Simon , K. Schuster , F. F. S. van der Tak , A. G. G. M. Tielens , D. Teyssier , N. Trappe , C. Vastel , S. Viti , V. Wakelam , A. Walters , S. Wang , N. Whyborn , M. van der Wiel , H. W. Yorke , S. Yu , J. Zmuidzinas

Oxygen and Nitrogen in Isolated Dwarf Irregular Galaxies

We present long slit optical spectroscopy of 67 HII regions in 21 dwarf irregular galaxies to investigate the enrichment of oxygen, nitrogen, neon, sulfur, and argon in low mass galaxies. Oxygen abundances are obtained via direct detection…

Astrophysics · Physics 2009-11-13 L. van Zee , M. P. Haynes

HI and CO Observations of Circumnebular Envelopes of Planetary Nebulae

21cm spectral-line and continuum observations of ten compact planetary nebulae have been made with the Very Large Array. Circumnebular atomic hydrogen is identified in the planetary nebulae SwSt1, M3-35, and possibly in Hu2-1. The…

Astrophysics · Physics 2015-06-24 G. T. Gussie , A. R. Taylor

Rotational spectroscopy of the HCCO and DCCO radicals in the millimeter and submillimeter range

The ketenyl radical, HCCO, has recently been detected in the ISM for the first time. Further astronomical detections of HCCO will help us understand its gas-grain chemistry, and subsequently revise the oxygen-bearing chemistry towards dark…

Solar and Stellar Astrophysics · Physics 2019-01-23 J. Chantzos , S. Spezzano , C. Endres , L. Bizzocchi , V. Lattanzi , J. Laas , A. Vasyunin , P. Caselli

Detectable Abundance of Cyanoacetylene (HC$_3$N) Predicted on Reduced Nitrogen-Rich Super-Earth Atmospheres

We predict that cyanoacetylene (HC$_3$N) is produced photochemically in the atmosphere of GJ 1132 b in abundances detectable by the James Webb Space Telescope (JWST), assuming that the atmosphere is hydrogen dominated and rich in molecular…

Earth and Planetary Astrophysics · Physics 2021-11-17 Paul B. Rimmer , Liton Majumdar , Akshay Priyadarshi , Sam Wright , S. N. Yurchenko

A Search for Peculiar Objects with the NASA Orbital Debris Observatory 3-m Liquid Mirror Telescope

The NASA Orbital Debris Observatory (NODO) astronomical survey uses a transit 3-m liquid mirror telescope to observe a strip of sky in 20 narrow-band filters. In this article, we analyze a subset of data from the 1996 observing season. The…

Astrophysics · Physics 2016-08-30 R. Cabanac , E. F. Borra , M. Beauchemin

Expanding the submillimeter wave spectroscopy and astronomical search for thioacetamide (CH3CSNH2) in the ISM

Thioacetamide (CH3CSNH2) is the sulfur analog to acetamide (CH3CONH2) and it is a viable candidate to search for in astronomical environments specifically toward regions where other S-bearing molecules have been found and, if possible, that…

Astrophysics of Galaxies · Physics 2022-02-09 A. Remijan , C. Xue , L. Margulès , A. Belloche , R. A. Motiyenko , J. Carder , C. Codella , N. Balucani , C. L. Brogan , C. Ceccarelli , T. R. Hunter , A. Maris , S. Melandri , M. Siebert , B. A. McGuire

R=100,000 Spectroscopy of Photodissociation Regions: H2 Rotational Lines in the Orion Bar

Ground state rotational lines of H2 are good temperature probes of moderately hot (200-1000 K) gas. The low A-values of these lines result in low critical densities while ensuring that the lines are optically thin. ISO observations of H2…

Astrophysics · Physics 2009-11-10 Katelyn N. Allers , Daniel T. Jaffe , John H. Lacy , Matthew J. Richter

Neutral hydrogen at high redshift: probing structure formation

Large inhomogeneities in neutral hydrogen in the universe can be detected at redshifts $z \leq 10$ using the redshifted 21cm line emission from atomic hydrogen. This paper reviews the expected evolution of neutral hydrogen and presents…

Astrophysics · Physics 2007-05-23 J. S. Bagla

Flux Variations of Cosmic Ray Air Showers Detected by LHAASO-KM2A During a Thunderstorm on 10 June 2021

The Large High Altitude Air Shower Observatory (LHAASO) has three sub-arrays, KM2A, WCDA and WFCTA. The flux variations of cosmic ray air showers were studied by analyzing the KM2A data during the thunderstorm on 10 June 2021. The number of…

High Energy Astrophysical Phenomena · Physics 2022-12-07 LHAASO Collaboration , F. Aharonian , Q. An , Axikegu , L. X. Bai , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , J. T. Cai , Zhe Cao , Zhen Cao , J. Chang , J. F. Chang , E. S. Chen , Liang Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. J. Chen , Y. Chen , H. L. Cheng , N. Cheng , Y. D. Cheng , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , D. della Volpe , K. K. Duan , J. H. Fan , Y. Z. Fan , Z. X. Fan , J. Fang , K. Fang , C. F. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. L. Feng , B. Gao , C. D. Gao , L. Q. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , L. S. Geng , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Gu , J. G. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , H. H. He , H. N. He , S. L. He , X. B. He , Y. He , M. Heller , Y. K. Hor , C. Hou , X. Hou , H. B. Hu , Q. Hu , S. Hu , S. C. Hu , X. J. Hu , D. H. Huang , W. H. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Z. C. Huang , X. L. Ji , H. Y. Jia , K. Jia , K. Jiang , Z. J. Jiang , M. Jin , M. M. Kang , T. Ke , D. Kuleshov , B. B. Li , Cheng Li , Cong Li , F. Li , H. B. Li , H. C. Li , H. Y. Li , J. Li , Jian Li , Jie Li , K. Li , W. L. Li , X. R. Li , Xin Li , Xin Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. S. Liu , J. Y. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , Y. Liu , Y. N. Liu , W. J. Long , R. Lu , Q. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , A. Masood , Z. Min , W. Mitthumsiri , Y. C. Nan , Z. W. Ou , B. Y. Pang , P. Pattarakijwanich , Z. Y. Pei , M. Y. Qi , Y. Q. Qi , B. Q. Qiao , J. J. Qin , D. Ruffolo , A. Sáiz , C. Y. Shao , L. Shao , O. Shchegolev , X. D. Sheng , J. Y. Shi , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , Q. N. Sun , X. N. Sun , Z. B. Sun , P. H. T. Tam , Z. B. Tang , W. W. Tian , B. D. Wang , C. Wang , H. Wang , H. G. Wang , J. C. Wang , J. S. Wang , L. P. Wang , L. Y. Wang , R. Wang , R. N. Wang , W. Wang , X. G. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Y. J. Wang , Y. P. Wang , Z. H. Wang. Z. X. Wang , Zhen Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , C. Y. Wu , H. R. Wu , S. Wu , X. F. Wu , Y. S. W , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , G. G. Xin , Y. L. Xin , Y. Xing , Z. Xiong , D. L. Xu , R. X. Xu , L. Xue , D. H. Yan , J. Z. Yan , C. W. Yang , F. F. Yang , H. W. Yang , J. Y. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , S. B. Yang , Y. H. Yao , Z. G. Yao , Y. M. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , Z. K. Zeng , M. Zha , X. X. Zhai , B. B. Zhang , F. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , L. X. Zhang , Li Zhang , Lu Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. B. Zhang , S. R. Zhang , S. S. Zhang , X. Zhang , X. P. Zhang , Y. F. Zhang , Y. L. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , F. Zheng , Y. Zheng , B. Zhou , H. Zhou , J. N. Zhou , P. Zhou , R. Zhou , X. X. Zhou , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , X. Zuo

A spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite II. Data analysis

We investigate the physical and chemical conditions in a typical star forming region, including an unbiased search for new molecules in a spectral region previously unobserved. Due to its proximity, the Orion KL region offers a unique…

Solar and Stellar Astrophysics · Physics 2011-08-04 C. M. Persson , A. O. H. Olofsson , N. Koning , P. Bergman , P. Bernath , J. H. Black , U. Frisk , W. Geppert , T. I. Hasegawa , A. Hjalmarson , S. Kwok , B. Larsson , A. Lecacheux , A. Nummelin , M. Olberg , Aa. Sandqvist , E. S. Wirstrom

Herschel observations of interstellar chloronium. II - Detections toward G29.96-0.02, W49N, W51, and W3(OH), and determinations of the ortho-to-para and $^{35}$Cl/$^{37}$Cl isotopic ratios

We report additional detections of the chloronium molecular ion, H$_2$Cl$^+$, toward four bright submillimeter continuum sources: G29.96, W49N, W51, and W3(OH). With the use of the HIFI instrument on the Herschel Space Observatory, we…

Astrophysics of Galaxies · Physics 2015-05-06 David A. Neufeld , John H. Black , Maryvonne Gerin , Javier R. Goicoechea , Paul F. Goldsmith , Cecile Gry , Harshal Gupta , Eric Herbst , Nick Indriolo , Dariusz Lis , Karl M. Menten , Raquel Monje , Bhaswati Mookerjea , Carina Persson , Paule Sonnentrucker , Mark G. Wolfire

HIFI detection of HF in the carbon star envelope IRC +10216

We report the detection of emission in the J=1-0 rotational transition of hydrogen fluoride (HF), together with observations of the J=1-0 to J=3-2 rotational lines of H35Cl and H37Cl, towards the envelope of the carbon star IRC +10216.…

Astrophysics of Galaxies · Physics 2015-05-30 M. Agundez , J. Cernicharo , L. B. F. M. Waters , L. Decin , P. Encrenaz , D. Neufeld , D. Teyssier , F. Daniel

The IACOB project XIII. Helium enrichment in O-type stars as a tracer of past binary interaction

There is increasing evidence that single-star evolutionary models are inadequate to reproduce all observational properties of massive stars. Binary interaction has emerged as a key factor in the evolution of a significant fraction of…

Solar and Stellar Astrophysics · Physics 2025-01-08 C. Martínez-Sebastián , S. Simón-Díaz , H. Jin , Z. Keszthelyi , G. Holgado , N. Langer , J. Puls