The Peculiar Galaxy NGC 523

Chincarini, G.; Heckathorn, H. M.

doi:10.1086/129505

Cited by 3 publications

(3 citation statements)

References 2 publications

(2 reference statements)

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“…A close inspection of 2MASS nearinfrared images also shows that NW is qualitatively more compact than NC and NE. This confirms what Chincarini & Heckathorn (1973) found and closes the question of the nature of this object. -C1: A peak is visible at 24 µm without counterpart in ultraviolet, hinting that it may be a young, dusty star-forming region that has yet to break the surrounding dust cloud.…”

Section: Discussionsupporting

confidence: 91%

“…even though the Hα line is detected at the redshift of the system for NW the spectrum is typical of a star at zero velocity with a strong Balmer line in absorption, confirming the suggestion of Chincarini & Heckathorn (1973) that this compact object is a star in the Milky Way rather than a galactic nucleus. Upon close examination this is consistent with the morphology in the nearinfrared images, with NW that seems more compact than NE or NC.…”

Section: Metallicity Of the Clumpssupporting

confidence: 78%

“…They present a bar with 3 nearly aligned bright clumps. The nature of one of them, galactic nuclei or a foreground star, is debated in the literature (Chincarini & Heckathorn 1973;Dahari 1985). Prominent dust lanes are visible north of the bar.…”

Section: Introductionmentioning

confidence: 99%

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Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158

Boquien¹,

Lisenfeld²,

Duc³

et al. 2011

A&A

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Context. Recent studies have shown that star formation in mergers does not seem to follow the same Schmidt-Kennicutt relation as in spiral disks, presenting a higher star formation rate (SFR) for a given gas column density. Aims. In this paper we study why and how different models of star formation arise. To do so we examine the process of star formation in the interacting system Arp 158 and its tidal debris. Methods. We perform an analysis of the properties of specific regions of interest in Arp 158 using observations tracing the atomic and the molecular gas, star formation, the stellar populations as well as optical spectroscopy to determine their exact nature and their metallicity. We also fit their spectral energy distribution with an evolutionary synthesis code. Finally, we compare star formation in these objects to star formation in the disks of spiral galaxies and mergers. Results. Abundant molecular gas is found throughout the system and the tidal tails appear to have many young stars compared to their old stellar content. One of the nuclei is dominated by a starburst whereas the other is an active nucleus. We estimate the SFR throughout the systems using various tracers and find that most regions follow closely the Schmidt-Kennicutt relation seen in spiral galaxies with the exception of the nuclear starburst and the tip of one of the tails. We examine whether this diversity is due to uncertainties in the manner the SFR is determined or whether the conditions in the nuclear starburst region are such that it does not follow the same Schmidt-Kennicutt law as other regions. Conclusions. Observations of the interacting system Arp 158 provide the first evidence in a resolved fashion that different star-forming regions in a merger may be following different Schmidt-Kennicutt laws. This suggests that the physics of the interstellar medium at a scale no larger than 1 kpc, the size of the largest gravitational instabilities and the injection scale of turbulence, determines the origin of these laws.

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Section: Discussionsupporting

confidence: 91%

Section: Metallicity Of the Clumpssupporting

confidence: 78%

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Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158

Boquien¹,

Lisenfeld²,

Duc³

et al. 2011

A&A

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Electronography of Extended Objects

Chincarini

Heckathorn

1976

Photo-Electronic Image Devices, Proceedings of the Sixth Symposium

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Neutral Hydrogen in Arp 158

Iyer¹,

Simpson²,

Gottesman³

et al. 2004

Astron J

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We present 21 cm observations of Arp 158. We have performed a study of the neutral hydrogen ( H i) to help us understand the overall formation and evolution of this system. This is a disturbed system with distinct optical knots connected by a linear structure embedded in luminous material. There is also a diffuse spray to the southeast. The H i seems to be made up of three distinct, kinematically separate systems. Arp 158 bears a certain optical resemblance to NGC 520 (Arp 157), which has been identified as a mid-stage merger. From our 21 cm observations of Arp 158, we also see a comparable H i content with NGC 520. These similarities suggest that Arp 158 is also an intermediate-stage merger.

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The Peculiar Galaxy NGC 523

Cited by 3 publications

References 2 publications

Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158

Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158

Electronography of Extended Objects

Neutral Hydrogen in Arp 158

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