Results 1 to 10 of about 12,515 (261)

JWST/NIRSpec Observations of Brown Dwarfs in the Orion Nebula Cluster

The Astrophysical Journal
We have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1–5 μ m spectra of 22 brown dwarf candidates in the Orion Nebula Cluster, which were selected with ...
K. L. Luhman, C. Alves de Oliveira, I. Baraffe, G. Chabrier, E. Manjavacas, R. J. Parker, P. Tremblin   +6 more
doaj   +2 more sources

Photographs of the nebula in orion [PDF]

Nature, 1880
DURING the night of September 30 I succeeded in photographing the bright part of the nebula in Orion in the vicinity of the trapezium. The photographs show the mottled appearance of this region distinctly. I intend shortly to publish a detailed description of the negatives. They were taken by the aid of a triple objective of eleven inches aperture made
Henry Draper
openalex   +4 more sources

The NIKA polarimeter on science targets: Crab nebula observations at 150 GHz and dual-band polarization images of Orion Molecular Cloud OMC-1 [PDF]

EPJ Web of Conferences, 2020
We present here the polarization system of the NIKA camera and give a summary of the main results obtained and performed studies on Orion and the Crab nebula.
Ritacco A., Adam R., Ade P., André P., Andrianasolo A., Aussel H., Beelen A., Benoît A., Bideaud A., Bourrion O., Calvo M., Catalano A., Comis B., De Petris M., Désert F.-X., Doyle S., Driessen E.F.C., Gomez A., Goupy J., Kéruzoré F., Kramer C., Ladjelate B., Lagache G., Leclercq S., Lestrade J.-F., Macías-Pérez J.F., Mauskopf P., Maury A., Mayet F., Monfardini A., Perotto L., Pisano G., Ponthieu N., Revéret V., Romero C., Roussel H., Ruppin F., Schuster K., Shu S., Sievers A., Tucker C., Zylka R.   +41 more
doaj   +1 more source

HCN/HNC ratio: A new chemical thermometer at 3 mm [PDF]

EPJ Web of Conferences, 2022
The gas kinetic temperature (TK) determines the physical and chemical evolution of the interstellar medium (ISM). This work explores the use of HCN/HNC (J=1–0) line ratio as new probe of the gas kinetic temperature in the molecular ISM.
Hacar Alvaro, Suri Sümeyye
doaj   +1 more source

Backscattering and Line Broadening in Orion

The Astronomical Journal, 2022
Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region.
C. R. O’Dell, G. J. Ferland, J. E. Méndez-Delgado   +2 more
doaj   +1 more source

Explaining the Chemical Inventory of Orion KL through Machine Learning

The Astrophysical Journal, 2023
The interplay of the chemistry and physics that exists within astrochemically relevant sources can only be fully appreciated if we can gain a holistic understanding of their chemical inventories. Previous work by Lee et al.
Haley N. Scolati, Anthony J. Remijan, Eric Herbst, Brett A. McGuire, Kin Long Kelvin Lee   +4 more
doaj   +1 more source

SiO Emission from the Orion Nebula [PDF]

Symposium - International Astronomical Union, 1980
SiO emission in both a strong maser transition in the first excited vibrational state and in a weaker transition in the ground vibrational state both arise from the same small region in the Kleinmann-Low Nebula in Orion. Within the errors, the source position coincides with that of the infrared source IRc2.
B. Baud, J. H. Bieging, R. L. Plambeck, D. D. Thornton, W. J. Welch, M. C. H. Wright   +5 more
openaire   +1 more source

ON THE QUESTION OF THE HELIUM ABUNDANCE IN ORION A MEASURED BY RADIO RECOMBINATION LINES. AND THE PRIMORDIAL HELIUM ABUNDANCE

Odessa Astronomical Publications, 2020
Recombination radio lines (RRLs) of hydrogen (H), helium (He-4), and carbon (C) are a powerful tool for studying the interstellar medium (ISM) in space.
A. P. Tsivilev
doaj   +1 more source

Compression and ablation of the photo-irradiated molecular cloud the Orion Bar [PDF]

Nature, 2016
Javier Rodríguez Goicoechea, Sara Cuadrado, Jose Cernicharo   +2 more
exaly   +2 more sources

EVOLUTION OF THE CRAB NEBULA RADIO EMISSION

Odessa Astronomical Publications, 2017
In 1977-1992 the flux density of the Crab Nebula in respect to Orion Nebula was measured at the frequency of 927 MHz with the same 10-m radio telescope.
E. N. Vinyajkin
doaj   +1 more source