NGC 7714 - The prototype star-burst galactic nucleus

Weedman, D. W.; Feldman, F. R.; Balzano, V.; Ramsey, Lawrence W.; Sramek, R. A.; Wuu, C. C.

doi:10.1086/159133

Cited by 121 publications

(88 citation statements)

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“…Such a shift, of lower value (∼100 km s −1 ), is also found in the polarized broad component reported by Tran (1995). Veilleux et al (1997) (Brodie et al 1987;Durret 1994 Weedman et al (1981) as an archetype of the starburst nucleus galaxies. According to Kinney et al (1993), the burst of star formation is thought to be caused by interaction with the companion NGC 7715.…”

Section: Notes On Individual Objectssupporting

confidence: 66%

A 0.8–2.4μm spectral atlas of active galactic nuclei

Riffel

Rodríguez-Ardila²,

Pastoriza

2006

A&A

200

286

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Aims. We present a near-infrared spectral atlas of 47 active galactic nuclei (AGN) of all degrees of activity in the wavelength interval of 0.8-2.4 µm, including the fluxes of the observed emission lines. We analyze the spectroscopic properties of the continuum and emission line spectra of the sources. Methods. In order to exclude aperture and seeing effects we used near-infrared spectroscopy in the short cross-dispersed mode (SXD, 0.8-2.4 µm), taking the JHK-bands spectra simultaneously.Results. We present the most extensive NIR spectral atlas of AGN to date. This atlas offers a suitable database for studying the continuum and line emission properties of these objects in a region full of interesting features. The shape of the continuum of QSOs and Sy 1's are similar, being essentially flat in the H and K bands, while a strong variation is found in the J band. In Seyfert 2 galaxies, the continuum in the Fλ × λ space smoothly decreases in flux from 1.2 µm redwards in almost all sources. In J, it smoothly rises bluewards in some sources, while in others a small decrease in flux is observed. The spectra are dominated by strong emission

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Section: Notes On Individual Objectssupporting

confidence: 66%

A 0.8–2.4μm spectral atlas of active galactic nuclei

Riffel

Rodríguez-Ardila²,

Pastoriza

2006

A&A

200

286

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“…As discussed in §5.2, the Schechter function also provides a good fit to the distribution function of total SFRs of galaxies, with the characteristic SFR in the exponential designated as SFR * , in analogy to L * above. The term "starburst galaxy" was introduced by Weedman et al (1981), but nowadays the term is applied to a diverse array of galaxy populations. The common property of the present-day populations of starbursts is a SFR out of equilibrium, much higher than the long-term average SFR of the system.…”

Section: Definitions and Conventionsmentioning

confidence: 99%

Star Formation in the Milky Way and Nearby Galaxies

Kennicutt

Evans

2012

Annu. Rev. Astron. Astrophys.

2,695

139

2,728

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We review progress over the past decade in observations of large-scale star formation, with a focus on the interface between extragalactic and Galactic studies. Methods of measuring gas contents and star formation rates are discussed, and updated prescriptions for calculating star formation rates are provided. We review relations between star formation and gas on scales ranging from entire galaxies to individual molecular clouds. Subject headings: star formation, galaxies, Milky Way 1. OVERVIEW 1.1. Introduction Star formation encompasses the origins of stars and planetary systems, but it is also a principal agent of galaxy formation and evolution, and hence a subject at the roots of astrophysics on its largest scales.The past decade has witnessed an unprecedented stream of new observational information on star formation on all scales, thanks in no small part to new facilities such as the Galaxy Evolution Explorer (GALEX), the Spitzer Space Telescope, the Herschel Space Observatory, the introduction of powerful new instruments on the Hubble Space Telescope (HST), and a host of groundbased optical, infrared, submillimeter, and radio telescopes. These new observations are providing a detailed reconstruction of the key evolutionary phases and physical processes that lead to the formation of individual stars in interstellar clouds, while at the same time extending the reach of integrated measurements of star formation rates (SFRs) to the most distant galaxies known. The new data have also stimulated a parallel renaissance in theoretical investigation and numerical modelling of the star formation process, on scales ranging from individual protostellar and protoplanetary systems to the scales of molecular clouds and star clusters, entire galaxies and ensembles of galaxies, even to the first objects, which are thought to have reionized the Universe and seeded today's stellar populations and Hubble sequence of galaxies.This immense expansion of the subject, both in terms of the volume of results and the range of physical scales explored, may help to explain one of its idiosyncracies, namely the relative isolation between the community studying individual star-forming regions and stars in the Milky Way (usually abbreviated hereafter as MW, but sometimes referred to as "the Galaxy"), and the largely extragalactic community that attempts to characterise the star formation process on galactic and cosmologiElectronic address: robk@ast.cam.as.uk Electronic address: nje@astro.as.utexas.edu cal scales. Some aspects of this separation have been understandable. The key physical processes that determine how molecular clouds contract and fragment into clumps and cores and finally clusters and individual stars can be probed up close only in the Galaxy, and much of the progress in this subject has come from in-depth case studies of individual star-forming regions. Such detailed observations have been impossible to obtain for even relatively nearby galaxies. Instead the extragalactic branch of the subject has focused on the co...

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“…Data obtained early in the IUE mission demonstrated the existence of a rich absorption spectrum in star-forming galaxies (Weedman et al 1981;Huchra et al 1983). The identification of prominent UV spectral features with lines seen in massive stars provided some of the first direct evidence for the presence of large numbers of massive stars in actively star-forming galaxies.…”

Section: Introductionmentioning

confidence: 99%

An Ultraviolet Spectroscopic Atlas of Local Starbursts and Star-Forming Galaxies: The Legacy of Fos and GHRS

Leitherer

Tremonti

Heckman

et al. 2011

The Astronomical Journal

128

214

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We present 46 rest-frame ultraviolet (UV) spectra of 28 local starburst and star-forming galaxies which were observed with the Faint Object Spectrograph (FOS) and the Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST) at a spectral resolution of a few 100 km s −1 . We compare the HST spectra with lower resolution International Ultraviolet Explorer (IUE) spectra of the same galaxies and find systematic differences: the bright star clusters targeted in HST's ∼1 apertures provide about 15% of the starburst luminosity traced by IUE's 10 × 20 aperture; they are bluer and have stronger stellar-wind features suggesting that the HST apertures have preferentially been placed on the youngest areas of the burst. In contrast, lines arising from the interstellar medium (ISM) show similar equivalent widths in both the large and small aperture observations, suggesting similar ISM properties from larger to smaller scales. In order to quantify the UV spectral morphology of star-forming galaxies, we created a set of UV line indices similar to the standard optical Lick indices. We discuss the relation between the UV spectral morphology and the properties of the galaxy host. We present our atlas of FOS and GHRS spectra both in print and online. The data set is useful as a baseline for comparisons with observations of the rest-frame UV spectra of star-forming galaxies at high redshift.Key words: atlases -galaxies: high-redshift -galaxies: starburst -galaxies: stellar content -line: profilesultraviolet: galaxies Online-only material: color figures 1. MOTIVATION While our understanding of galaxy formation and evolution is in many ways incomplete, it has become increasingly evident that much of the stellar mass in the universe was assembled in violent and short-lived episodes of star formation at high redshift (e.g., Papovich et al. 2001;Shapley et al. 2001;Pérez-González et al. 2008). In the latter half of the Hubble time, the overall star formation rate of the universe has declined precipitously (Lilly et al. 1996;Cowie et al. 1999;Hopkins 2004). Nevertheless, there remain present-day examples of galaxies undergoing intense bursts of star formation. Indeed, while few in number, these starburst galaxies are responsible for ∼20% of the entire high-mass star formation in the local universe (Brinchmann et al. 2004). Local starburst galaxies provide us with an opportunity to investigate in detail a phenomenon with profound cosmic consequences.In this study, we examine the UV spectral properties of 28 local starburst galaxies which were observed with the Faint Object Spectrograph (FOS) and the Goddard High Resolution Spectrograph (GHRS) instruments on board the Hubble Space Telescope (HST). The rest-frame UV is of particular interest because it is the window onto the high-redshift universe provided by large ground-based telescopes working in the visible. Our study complements the earlier work of Kinney et al. (1993) and Heckman et al. (1998; hereafter H98) based on spectra obtained with the Internation...

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NGC 7714 - The prototype star-burst galactic nucleus

Cited by 121 publications

References 0 publications

A 0.8–2.4μm spectral atlas of active galactic nuclei

A 0.8–2.4μm spectral atlas of active galactic nuclei

Star Formation in the Milky Way and Nearby Galaxies

An Ultraviolet Spectroscopic Atlas of Local Starbursts and Star-Forming Galaxies: The Legacy of Fos and GHRS

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