Spectra of galaxies in the Case Low-Dispersion Sky Survey in the direction of the Bootes void

Details Spectra of galaxies in the Case Low-Dispersion Sky Survey in the direction of the Bootes void Spectra of galaxies in the Case Low-Dispersion Sky Survey in the direction of the Bootes void

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..172w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. 172-180.

Astronomy and Astrophysics

Astronomy

31

Galactic Clusters, Red Shift, Sky Surveys (Astronomy), Stellar Spectra, B Stars, Early Stars, O Stars, Star Formation

Scientific paper

A sample of 34 galaxies selected from the Case Low-Dispersion Northern Sky Survey in the direction of the Bootes void. Emission-line redshifts were obtained for 33 objects; the spectrum of the thirty-fourth galaxy contains no obvious features. Three of the emission-line galaxies are lcoated within the boundaries of the Bootes void, including one not previously reported. To date, all the galaxies discovered in the void have emission-line spectra. Although more than half the galaxies in the sample are fainter than M(B) = -21.0 mag, all five of the galaxies that were detected by IRAS are brighter than M(B) = 21.5 mag. The relative strengths of the emission lines in most of the galaxies, including those in the void, indicate the lines are excited by photoionization due to young, hot O and B stars. Possible causes for the star formation occurring in these galaxies include interaction with nearby galaxies, star formation induced by nuclear activity, and/or recent development of physical conditions required for star formation.

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