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sensitive species

Overview page. Subjects: Environmental Science.

Plant or animal species which are susceptible to changes in habitat or to impacts from human activities.

See overview in Oxford Index

A new determination of the primordial He abundance using the He i λ10830 Å emission line: cosmological implications

Y. I. Izotov, T. X. Thuan and N. G. Guseva.

in Monthly Notices of the Royal Astronomical Society

P ublished online September 2014 .

Journal Article. Subjects: Astronomy and Astrophysics. 9362 words.

We present near-infrared (NIR) spectroscopic observations of the high-intensity He i λ10830 Å emission line in 45 low-metallicity H ii regions. We combined these NIR data with spectroscopic...

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Early Results of the 3 mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region

Mika Sugimura, Takahiro Yamaguchi, Takeshi Sakai, Tomofumi Umemoto, Nami Sakai, Shuro Takano, Yuri Aikawa, Naomi Hirano, Sheng-Yuan Liu, T. J. Millar, Hideko Nomura, Yu-Nung Su, Shigehisa Takakuwa and Satoshi Yamamoto.

in Publications of the Astronomical Society of Japan

April 2011; p ublished online April 2011 .

Journal Article. Subjects: Interstellar Medium. 6036 words.

We have conducted a sensitive 3 mm observation toward the shocked region, Lynds 1157 B1, which is an interaction spot between a molecular outflow and its ambient gas. We have successfully...

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Solid deuterated water in space: detection constraints from laboratory experiments

R G Urso, M E Palumbo, G A Baratta, C Scirè and G Strazzulla.

in Monthly Notices of the Royal Astronomical Society

P ublished online June 2018 .

Journal Article. Subjects: Astronomy and Astrophysics. 6787 words.

ABSTRACT

The comparison between astronomical spectra and laboratory experiments is fundamental to spread light on the structure and composition of ices found...

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Effect of grain size on differential desorption of volatile species and on non-ideal MHD diffusivity

Bo Zhao, Paola Caselli and Zhi-Yun Li.

in Monthly Notices of the Royal Astronomical Society

P ublished online May 2018 .

Journal Article. Subjects: Astronomy and Astrophysics. 8520 words.

ABSTRACT

We developed a chemical network for modelling the chemistry and non-ideal magnetohydrodynamic (MHD) effects from the collapsing dense molecular clouds...

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Precise limits on cosmological variability of the fine-structure constant with zinc and chromium quasar absorption lines

Michael T. Murphy, Adrian L. Malec and J. Xavier Prochaska.

in Monthly Notices of the Royal Astronomical Society

P ublished online June 2016 .

Journal Article. Subjects: Astronomy and Astrophysics. 13418 words.

The strongest transitions of Zn and Cr ii are the most sensitive to relative variations in the fine-structure constant (Δα/α) among the transitions commonly observed in quasar absorption...

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H0LiCOW – I. H 0 Lenses in COSMOGRAIL's Wellspring: program overview

S. H. Suyu, V. Bonvin, F. Courbin, C. D. Fassnacht, C. E. Rusu, D. Sluse, T. Treu, K. C. Wong, M. W. Auger, X. Ding, S. Hilbert, P. J. Marshall, N. Rumbaugh, A. Sonnenfeld, M. Tewes, O. Tihhonova, A. Agnello, R. D. Blandford, G. C.-F. Chen, T. Collett, L. V. E. Koopmans, K. Liao, G. Meylan and C. Spiniello.

in Monthly Notices of the Royal Astronomical Society

P ublished online February 2017 .

Journal Article. Subjects: Astronomy and Astrophysics. 11552 words.

Abstract

Strong gravitational lens systems with time delays between the multiple images allow measurements of time-delay distances, which are primarily...

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The role of the geometry and dust environment in stationary models of translucent interstellar clouds

M. Kopp, E. Roueff and G. Pineau des Forêts.

in Monthly Notices of the Royal Astronomical Society

June 2000; p ublished online June 2000 .

Journal Article. Subjects: Astronomy and Astrophysics. 7138 words.

A full radiative transfer model is presented for the ultraviolet (UV) radiation impinging on an interstellar cloud of spherical or finite plane-parallel slab geometry containing gas and...

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Chemical tracers of high-metallicity environments

E. Bayet, T. A. Davis, T. A. Bell and S. Viti.

in Monthly Notices of the Royal Astronomical Society

August 2012; p ublished online August 2012 .

Journal Article. Subjects: Astronomy and Astrophysics. 7952 words.

Abstract

We present for the first time a detailed study of the properties of molecular gas in metal-rich environments such as early-type galaxies (ETGs). We...

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Deuterium chemistry of dense gas in the vicinity of low-mass and massive star-forming regions

Zainab Awad, Serena Viti, Estelle Bayet and Paola Caselli.

in Monthly Notices of the Royal Astronomical Society

P ublished online July 2014 .

Journal Article. Subjects: Astronomy and Astrophysics. 6382 words.

The standard interstellar ratio of deuterium to hydrogen (D/H) atoms is ∼1.5 × 10−5. However, the deuterium fractionation is in fact found to be enhanced, to different degrees, in cold,...

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Chemistry in a gravitationally unstable protoplanetary disc

J. D. Ilee, A. C. Boley, P. Caselli, R. H. Durisen, T. W. Hartquist and J. M. C. Rawlings.

in Monthly Notices of the Royal Astronomical Society

November 2011; p ublished online November 2011 .

Journal Article. Subjects: Astronomy and Astrophysics. 6453 words.

Until now, axisymmetric, α-disc models have been adopted for calculations of the chemical composition of protoplanetary discs. While this approach is reasonable for many discs, it is not...

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Modelling line profiles in infalling cores

J.M.C. Rawlings and J.A. Yates.

in Monthly Notices of the Royal Astronomical Society

October 2001; p ublished online October 2001 .

Journal Article. Subjects: Astronomy and Astrophysics. 6935 words.

Abstract

Results are presented from a model of molecular line formation in collapsing star-forming cores. The study includes, for the first time, a...

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Is acetylene essential for carbon dust formation?

H. Dhanoa and J. M. C. Rawlings.

in Monthly Notices of the Royal Astronomical Society

P ublished online March 2014 .

Journal Article. Subjects: Astronomy and Astrophysics. 6498 words.

We have carried out an investigation of the chemical evolution of gas in different carbon-rich circumstellar environments. Previous studies have tended to invoke terrestrial flame...

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Why multitracer surveys beat cosmic variance

L. Raul Abramo and Katie E. Leonard.

in Monthly Notices of the Royal Astronomical Society

June 2013; p ublished online April 2013 .

Journal Article. Subjects: Astronomy and Astrophysics. 7123 words.

Galaxy surveys that map multiple species of tracers of large-scale structure can improve the constraints on some cosmological parameters far beyond the limits imposed by a simplistic...

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Heavy-element abundances in seven SC stars and several related stars

C. Abia and G. Wallerstein.

in Monthly Notices of the Royal Astronomical Society

January 1998; p ublished online January 1998 .

Journal Article. Subjects: Astronomy and Astrophysics. 0 words.

Abstract

We employ spectra of resolution 20-35000 of seven SC stars, four S stars, two Ba stars and two K-M stars to derive abundances of a variety of...

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On the hardening of the ionizing radiation in H ii regions across galactic discs through softness parameters

Enrique Pérez-Montero and José M. Vílchez.

in Monthly Notices of the Royal Astronomical Society

December 2009; p ublished online December 2009 .

Journal Article. Subjects: Astronomy and Astrophysics. 3553 words.

We carry out a study of the hardness of the radiation of ionizing clusters in H ii regions. First, we explore the applicability of the softness parameter η, originally defined in the...

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Si x emission lines in spectra obtained with the Solar EUV Rocket Telescope and Spectrograph (SERTS)

F. P. Keenan, E. O'Shea, R. J. Thomas, J. W. Brosius, A. Katsiyannis, R. S. I. Ryans, R. H. G. Reid, A. K. Pradhan and H. L. Zhang.

in Monthly Notices of the Royal Astronomical Society

July 2000; p ublished online July 2000 .

Journal Article. Subjects: Astronomy and Astrophysics. 2624 words.

New R-matrix calculations of electron impact excitation rates for transitions among the 2s22p, 2s2p2 and 2p3 levels of Si x are presented. These data are subsequently used, in conjunction...

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A search for propylene oxide and glycine in Sagittarius B2 (LMH) and Orion

M. R. Cunningham, P. A. Jones, P. D. Godfrey, D. M. Cragg, I. Bains, M. G. Burton, P. Calisse, N. H. M. Crighton, S. J. Curran, T. M. Davis, J. T. Dempsey, B. Fulton, M. G. Hidas, T. Hill, L. Kedziora-Chudczer, V. Minier, M. B. Pracy, C. Purcell, J. Shobbrook and T. Travouillon.

in Monthly Notices of the Royal Astronomical Society

April 2007; p ublished online March 2007 .

Journal Article. Subjects: Astronomy and Astrophysics. 6161 words.

We have used the Mopra Telescope to search for glycine and the simple chiral molecule propylene oxide in the Sgr B2 (LMH) and Orion KL, in the 3-mm band. We have not detected either...

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Type II Plateau supernovae as metallicity probes of the Universe

L. Dessart, C. P. Gutierrez, M. Hamuy, D. J. Hillier, T. Lanz, J. P. Anderson, G. Folatelli, W. L. Freedman, F. Ley, N. Morrell, S. E. Persson, M. M. Phillips, M. Stritzinger and N. B. Suntzeff.

in Monthly Notices of the Royal Astronomical Society

P ublished online March 2014 .

Journal Article. Subjects: Astronomy and Astrophysics. 5904 words.

We explore a method for metallicity determinations based on quantitative spectroscopy of Type II-Plateau supernovae (SNe II-P). For consistency, we first evolve a set of 15 M main-sequence...

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On the relationship between the H2 emission and the physical structure of planetary nebulae

R. A. Marquez-Lugo, G. Ramos-Larios, M. A. Guerrero and R. Vázquez.

in Monthly Notices of the Royal Astronomical Society

February 2013; p ublished online December 2012 .

Journal Article. Subjects: Astronomy and Astrophysics. 8386 words.

Mid-infrared (IR) observations of planetary nebulae (PNe) have revealed diffuse emission associated with their main nebular shells and outer envelopes or haloes. The interpretation of this...

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Fe xii emission lines in spectra obtained with the Solar EUV Rocket Telescope andSpectrograph (SERTS)

F. P. Keenan, R. J. Thomas, W. M. Neupert, V. J. Foster, P. J. F. Brown and S. S. Tayal.

in Monthly Notices of the Royal Astronomical Society

February 1996 .

Journal Article. Subjects: Astronomy and Astrophysics. 0 words.

Many intensity ratios involving Fe xii 3s23p3-3s3p4 and 3s23p3-3s23p23d transitions in the 186–383 Å wavelength range are known to be sensitive to electron density. We compare calculations...

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