The Arizona–New Mexico Spectroscopic Survey of Galaxies. III. On Galaxy Populations

Gregory, S. A.; Tifft, W. G.; Moody, J. W.; Newberry, Michael V.; Hall, Shannon M.

doi:10.1086/301197

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…From Blue Compact Dwarf galaxies to QSOs, galaxian activity manifests itself on all scales and over the entire range of the electromagnetic spectrum. Activity in galaxies appears to be common, with between 5 and 10% of all galaxies showing evidence for it via the presence of unusually strong emission lines in their spectra (e.g., Salzer 1989, Gregory et al 2000. The study of these objects has been a major research topic for many years, and a great deal has been learned about the physical processes occurring in the active regions of both AGN and starburst galaxies.…”

Section: Introductionmentioning

confidence: 99%

The KPNO International Spectroscopic Survey. I. Description of the Survey

Salzer¹,

Grönwall²,

Lipovetsky³

et al. 2000

The Astronomical Journal

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The KPNO International Spectroscopic Survey (KISS) is a new objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless spectroscopic surveys that were carried out with Schmidt telescopes using photographic plates with the advantages of modern CCD detectors. It is the first purely digital objective-prism survey, and extends previous photographic surveys to substantially fainter flux limits. In this, the first paper in the series, we give an overview of the survey technique, describe our data processing procedures, and present examples of the types of objects found by KISS. Our first Hα-selected survey list detects objects at the rate of 18.1 per square degree, which is 181 times higher than the surface density of the Markarian survey. Since the sample is line-selected, there is an imposed redshift limit of z < ∼ 0.095 due to the filter employed for the objective-prism observations. We evaluate the quality of the observed parameters derived from the survey data, which include accurate astrometry, photometry, redshifts, and line fluxes. Finally, we describe some of the many applications the KISS database will have for addressing specific questions in extragalactic astronomy. Subsequent papers in this series will present our survey lists of emission-line galaxy candidates.

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Section: Introductionmentioning

confidence: 99%

The KPNO International Spectroscopic Survey. I. Description of the Survey

Salzer¹,

Grönwall²,

Lipovetsky³

et al. 2000

The Astronomical Journal

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123

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show abstract

“…Because detection is a function of line strength, we must know the percentage of galaxies with Hα, [O III], and [O II] emission as a function of equivalent width. Gregory et al (2000) measured 350 galaxies in the Arizona-New Mexico Spectroscopic Survey of Galaxies (ANM) specifically to get spectral emission and absorption characteristics for a complete sample of galaxies away from rich clusters. Their results for the percentage of galaxies having equivalent widths greater than 10, 20, 50, and 100 Å are given in Table 1.…”

Section: Expected Numbersmentioning

confidence: 99%

Searching for Dwarf Hα Emission-line Galaxies within Voids. I. Survey Methods and First Observations

Draper

Moody

McNeil

et al. 2023

ApJ

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The population density of dwarf galaxies in low-density voids is likely determined by the dark matter halo mass function and how galaxy formation proceeds in smaller halos. This depends on the nature of dark matter itself, making the dwarf galaxy population a tracer of its properties. While dwarfs have been found in smaller, closer voids, they have proven difficult to find in larger, more distant voids through magnitude-limited spectroscopic surveys. This is because these surveys detect an overwhelmingly large number of objects behind the voids that must be verified spectroscopically, making void surveys prohibitively inefficient and expensive in terms of large-telescope time. Narrowband imaging for emission lines such as Hα reduces the number of background objects, although the overall number remains large. If imaging is done through a filter set with overlapping transmission wings, then object redshift can be estimated from photometry alone. The precision possible is an order of magnitude greater than single-band photometry, with the caveat that the captured line must be identified through other means. Broadband photometry can be used to reject enough objects with emission of an unwanted type to make obtaining spectra of the remaining objects feasible. In this study, we present an Hα survey for dwarf galaxies with M r ′ fainter than −14 mag through the center 4.3 square degrees of the void FN8. Using Sloan g ′ , r ′ , i ′ photometry, we exclude enough [O ii] and [O iii] emitters that follow-up spectra of only a few dozen objects are required to statistically estimate the void population density.

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The Arizona–New Mexico Spectroscopic Survey of Galaxies. III. On Galaxy Populations

Cited by 2 publications

References 23 publications

The KPNO International Spectroscopic Survey. I. Description of the Survey

The KPNO International Spectroscopic Survey. I. Description of the Survey

Searching for Dwarf Hα Emission-line Galaxies within Voids. I. Survey Methods and First Observations

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