The Central Regions of NGC 4691: A Remarkable Structure with a Fast Outflow near the Nucleus

García-Barreto, J. A.; Franco, J.; Guichard, J.; Carrillo, R.

doi:10.1086/176207

Cited by 8 publications

(7 citation statements)

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“…NGC 4691 is described as an "irregular galaxy of the M 82 type" by Sandage (1961) and then as amorphous (Sandage & Bedke 1994), based on the chaotic, "intricate and extensive dust pattern in the central regions" which is similar to that in some starburst galaxies such as M 82 and suggests "galactic fountain activity". This interpretation is supported by the spectroscopic data of García-Barreto et al (1995), whose I-band and Hα images also reveal a peculiar central structure with four knots. The two strongest Hα knots are resolved in our mid-infrared images, and are surrounded by two concentrations of molecular gas aligned with them, but at nearly twice the distance from the center (Wiklind et al 1993).…”

Section: Well Resolved Galaxiessupporting

confidence: 53%

An atlas of mid-infrared dust emission in spiral galaxies

Roussel

Vigroux

Bosma³

et al. 2001

A&A

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Abstract. We present maps of dust emission at 7 µm and 15 µm/7 µm intensity ratios of selected regions in 43 spiral galaxies observed with ISOCAM. This atlas is a complement to studies based on these observations, dealing with star formation in centers of barred galaxies and in spiral disks. It is accompanied by a detailed description of data reduction and an inventory of generic morphological properties in groups defined according to bar strength and HI gas content.

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Section: Well Resolved Galaxiessupporting

confidence: 53%

An atlas of mid-infrared dust emission in spiral galaxies

Roussel

Vigroux

Bosma³

et al. 2001

A&A

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“…The color maps show a total of seven distinct blue regions in the bar, four of which correspond to the H-bright knots studied photometrically and spectroscopically by García-Barreto et al (1995); the latter are the four brightest '' nuclei '' in the R-band image (Fig. 34e).…”

Section: Ngc 4665mentioning

confidence: 99%

“…The color maps show a total of seven distinct blue regions in the bar, four of which correspond to the Hαbright knots studied photometrically and spectroscopically by García-Barreto et al (1995); the latter are the four brightest "nuclei" in the R-band image (panel e). The easternmost blue region is separated from the rest by a narrow dust lane, which appears to connect with strong dust lanes which run along the north and south sides of the bar.…”

Section: Ngc 4691: Dust-obscuredmentioning

confidence: 99%

An Imaging Survey of Early‐Type Barred Galaxies

Erwin

Sparke

2003

ASTROPHYS J SUPPL S

119

220

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This paper presents the results of a high-resolution imaging survey, using both ground-based and Hubble Space Telescope images, of a complete sample of nearby barred S0-Sa galaxies in the field, with a particular emphasis on identifying and measuring central structures within the bars: secondary bars, inner disks, nuclear rings and spirals, and off-plane dust. A discussion of the frequency and statistical properties of the various types of inner structures has already been published. Here we present the data for the individual galaxies and measurements of their bars and inner structures. We set out the methods we use to find and measure these structures, and how we discriminate between them. In particular, we discuss some of the deficiencies of ellipse fitting of the isophotes, which by itself cannot always distinguish between bars, rings, spirals, and dust, and which can produce erroneous measurements of bar sizes and orientations.

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“…J1247-03 (NGC 4691), for example, with a low Hi mass (log(M Hi /M ) = 8.17), generates the second-highest l Hα and l FUV contributions (4.3 and 3.6 per cent, respectively). J1247-03 is a SBb peculiar galaxy with significant central star formation and supernovae activity (see Garcia-Barreto et al (1995) for further discussion). The lowest mass bin contributes the same, or more, per dex to the total Hα and FUV luminosity densities and SFRDs than the highest Hi mass bin (see columns ( 5) and ( 6) of Table 3a).…”

Section: Quantitymentioning

confidence: 99%

Near-identical star formation rate densities from Hα and FUVat redshift zero

Audcent-Ross

Meurer

Wong

et al. 2018

Monthly Notices of the Royal Astronomical Society

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For the first time both Hα and far-ultraviolet (FUV) observations from an Hi-selected sample are used to determine the dust-corrected star formation rate density (SFRD: ρ) in the local Universe. Applying the two star formation rate indicators on 294 local galaxies we determine log( ρ Hα ) = −1.68 +0.13. These values are derived from scaling Hα and FUV observations to the Hi mass function. Galaxies were selected to uniformly sample the full Hi mass (M Hi ) range of the Hi Parkes All-Sky Survey (M Hi ∼ 10 7 to ∼ 10 10.7 M ). The approach leads to relatively larger sampling of dwarf galaxies compared to optically-selected surveys. The low Hi mass, low luminosity and low surface brightness galaxy populations have, on average, lower Hα/FUV flux ratios than the remaining galaxy populations, consistent with the earlier results of Meurer. The near-identical Hα-and FUV-derived SFRD values arise with the low Hα/FUV flux ratios of some galaxies being offset by enhanced Hα from the brightest and high mass galaxy populations. Our findings confirm the necessity to fully sample the Hi mass range for a complete census of local star formation to include lower stellar mass galaxies which dominate the local Universe.

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The Central Regions of NGC 4691: A Remarkable Structure with a Fast Outflow near the Nucleus

Cited by 8 publications

References 0 publications

An atlas of mid-infrared dust emission in spiral galaxies

An atlas of mid-infrared dust emission in spiral galaxies

An Imaging Survey of Early‐Type Barred Galaxies

Near-identical star formation rate densities from Hα and FUVat redshift zero

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