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Å

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 5 words.

Symbol for *angstrom.

A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

Masao Hayashi, Masayuki Tanaka, Rhythm Shimakawa, Hisanori Furusawa, Rieko Momose, Yusei Koyama, John D Silverman, Tadayuki Kodama, Yutaka Komiyama, Alexie Leauthaud, Yen-Ting Lin, Satoshi Miyazaki, Tohru Nagao, Atsushi J Nishizawa, Masami Ouchi, Takatoshi Shibuya, Ken-ichi Tadaki and Kiyoto Yabe.

in Publications of the Astronomical Society of Japan

January 2018; p ublished online October 2017 .

Journal Article. Subjects: Galaxies; Cosmology. 16117 words.

Abstract

We present initial results from the Subaru Strategic Program (SSP) with Hyper Suprime-Cam (HSC) on a comprehensive survey of emission-line galaxies at null...

AAO

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 7 words.

Abbr. for *Australian Astronomical Observatory.

AAS

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 7 words.

Abbr. for *American Astronomical Society.

AAT

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 6 words.

Abbr. for *Anglo-Australian Telescope.

AAVSO

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 10 words.

Abbr. for *American Association of Variable Star Observers.

Abell Catalogue

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 82 words.

A catalogue of 2712 rich clusters of galaxies published in 1958 by the American astronomer George Ogden Abell (1927–83...

Abell cluster

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 78 words.

A cluster of galaxies listed in the *Abell Catalogue. To appear in the catalogue, a cluster must satisfy selection criteria which include containing more than 50 galaxies and having a dense...

Abell radius

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 34 words.

A radius of about 2 megaparsecs within which at least 50 galaxies of a particular range of brightness must be found if the cluster is to qualify as an ...

aberration, constant of

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 6 words.

aberration of starlight

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 152 words.

The small apparent difference between the observed direction of a star and its true direction (see diagram). It is due to the combined effect of the observer’s motion across the path of...

aberration, optical

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 67 words.

An imperfection or error in the image produced by a lens, mirror, or optical system. There are six types of aberration: ...

ablation

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 64 words.

The wearing away of the outer layers of a body by melting, erosion, vaporization, or some other process due to aerodynamic effects as the body moves at high speed through a planetary...

ablation age

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 38 words.

The period of time since the outer glassy layers of a tektite solidified following ablation during its re-entry into the Earth’s atmosphere. The ablation ages of known tektites vary from...

absolute magnitude

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 138 words.

1. The brightness that a star would have if it were at a distance of 10 parsecs in perfectly clear space without ...

Absolute proper motion of IRAS 00259+5625 with VERA: Indication of superbubble expansion motion

Nobuyuki Sakai, Mayumi Sato, Kazuhito Motogi, Takumi Nagayama, Katsunori M. Shibata, Masahiro Kanaguchi and Mareki Honma.

in Publications of the Astronomical Society of Japan

February 2014; p ublished online February 2014 .

Journal Article. Subjects: Galaxies; Astronomical Instrumentation, Methods, and Techniques; Interstellar Medium. 5934 words.

We present the first measurement of the absolute proper motions of IRAS 00259+5625 (CB3, LBN594) associated with the H i loop called the “NGC 281 superbubble” that extends from the Galactic...

Absolute Proper Motions of H2O Masers Away from the Galactic Plane Measured with VERA in the “Superbubble” Region NGC 281

Mayumi Sato, Tomoya Hirota, Mareki Honma, Hideyuki Kobayashi, Tetsuo Sasao, Takeshi Bushimata, Yoon Kyung Choi, Hiroshi Imai, Kenzaburo Iwadate, Takaaki Jike, Seiji Kameno, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-ya, Noriyuki Kawaguchi, Masachika Kijima, Mi Kyoung Kim, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Kenta Maruyama, Makoto Matsui, Naoko Matsumoto, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Kayoko Nakamura, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Katsuhisa Sato, Katsunori M. Shibata, Motonobu Shintani, Yoshiaki Tamura, Miyuki Tsushima and Kazuyoshi Yamashita.

in Publications of the Astronomical Society of Japan

August 2007; p ublished online August 2007 .

Journal Article. Subjects: Galaxies; Astrometry and Celestial Mechanics; Interstellar Medium. 6774 words.

We report on absolute proper-motion measurements of an H2O maser source in the NGC 281 West molecular cloud, which is located [math] 320 pc above the Galactic plane and is associated with...

absolute temperature

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 8 words.

Former name for *thermodynamic temperature.

absolute zero

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 63 words.

The zero point on the *thermodynamic temperature scale, equal to −273.15° Celsius or −459.67° Fahrenheit. It is often stated that all motion of atoms and molecules ceases at absolute zero,...

absorption

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 117 words.

The transfer of energy from a photon to an atom or molecule. If the energy of the photon is just sufficient to raise an electron from one energy level to another, the result is an...