The infrared and radio morphology of the 'hot-spot' galaxy NGC 2903

Wynn‐Williams, C. G.; Becklin, E. E.

doi:10.1086/162964

Cited by 26 publications

(31 citation statements)

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“…2, left panel, for a close‐up of the H ‐band emission) resolves the already known infrared hotspots (e.g. Wynn‐Williams & Becklin 1985; Simons et al 1988; Pérez‐Ramírez et al 2000) into a large number of individual stellar clusters.…”

Section: Morphologymentioning

confidence: 84%

“…Previous work on this galaxy at lower spatial resolution identified the bright infrared hotspots with sites of intense SF (e.g. Wynn‐Williams & Becklin 1985). It now appears that the bright NIR sources, although close to the H ii regions, are not coincident with them.…”

Section: Morphologymentioning

confidence: 85%

“…Early NIR studies of this galaxy have shown that considerable SF is occurring within the complex hotspot morphology in the nuclear region (e.g. Wynn‐Williams & Becklin 1985; Simons et al 1988). However, these studies lacked the necessary spatial resolution to determine whether the SF was confined to these hotspots or not.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear star formation in the hotspot galaxy NGC 2903

Alonso‐Herrero

Ryder

Knapen

2001

Monthly Notices of the Royal Astronomical Society

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We present high‐resolution near‐infrared imaging obtained using adaptive optics and HST/NICMOS, and ground‐based spectroscopy of the hotspot galaxy NGC 2903. Our near‐infrared resolution imaging enables us to resolve the infrared hotspots into individual young stellar clusters or groups of these. The spatial distribution of the stellar clusters is not coincident with that of the bright H ii regions, as revealed by the HST/NICMOS Paα image. Overall, the circumnuclear star formation in NGC 2903 shows a ring‐like morphology with an approximate diameter of 625 pc. The star formation properties of the stellar clusters and H ii regions have been studied using the photometric and spectroscopic information in conjunction with evolutionary synthesis models. The population of bright stellar clusters shows a very narrow range of ages, 4–7×106 yr after the peak of star formation, or absolute ages 6.5–9.5×106 yr (for the assumed short‐duration Gaussian bursts), and luminosities similar to the clusters found in the Antennae interacting galaxy. This population of young stellar clusters accounts for some 7–12 per cent of the total stellar mass in the central 625 pc of NGC 2903. The H ii regions in the ring of star formation have luminosities close to that of the supergiant H ii region 30 Doradus, they are younger than the stellar clusters, and they will probably evolve into bright infrared stellar clusters similar to those observed today. We find that the star formation efficiency in the central regions of NGC 2903 is higher than in normal galaxies, approaching the lower end of infrared luminous galaxies.

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Section: Morphologymentioning

confidence: 84%

Section: Morphologymentioning

confidence: 85%

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Nuclear star formation in the hotspot galaxy NGC 2903

Alonso‐Herrero

Ryder

Knapen

2001

Monthly Notices of the Royal Astronomical Society

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“…It was observed at radio (Williams & Becklin 1985;Tsai et al 2006), infrared (Simons et al 1988;Williams & Becklin 1985;Alonso-Herrero et al 2001), X-ray (Fabbiano et al 1984;Mizuno et al 1998;Junkes & Hensler 1996;Tschoke et al 2003), and optical wavelengths (Bresolin et al 2005). Multiwavelength observations of NGC 2903 implies that it has a very complex structure with knots in the nucleus.…”

Section: Introductionmentioning

confidence: 99%

An optical search for supernova remnants in the nearby spiral galaxy NGC 2903

Сонбас

Akyüz²,

Balman

2008

A&A

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Aims. We present the results of an optical search for supernova remnants (SNRs) in the nearby spiral galaxy NGC 2903. Methods. Interference filter images and spectral data were taken in March 2005 with the f/7.7 1.5 m Russian Turkish Telescope (RTT150) at TUBITAK National Observatory (TUG). Spectral data were obtained with the 6 m BTA (Bolshoi Azimuthal Telescope, Russia). We used the SNR identification criterion that consists of constructing the continuum-subtracted Hα and continuum-subtracted [SII]λλ6716, 6731 images and their ratios.

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“…Radio maps of the nuclear region do not exactly correspond to the optical hot spots. As an explanation, Wynn-Williams & Becklin (1985) suggested the possibility of patchy extinction. Recent near-infrared observations of the galactic core indeed reveal a ring-like morphology with a diameter of 625 pc (Alonso-Herrero et al 2001), coinciding with the radio rather than with the Hα structure.…”

Section: Introductionmentioning

confidence: 99%

An X-ray halo in the “hot-spot” galaxy NGC 2903

Tschöke

Hensler

Junkes

2003

A&A

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Abstract. In this paper we present ROSAT PSPC and HRI observations of the "hot-spot" galaxy NGC 2903. This isolated system strikingly reveals a soft extended X-ray feature reaching in north-west direction up to a projected distance of 5.2 kpc from the center into the halo. The residual X-ray emission in the disk reveals the same extension as the Hα disk. No eastern counterpart of the western X-ray halo emission has been detected. The luminosity of the extraplanar X-ray gas is several 10 38 erg s −1 , comparable to X-ray halos in other starburst galaxies. It has a plasma temperature of about 0.2 keV. The estimated star formation rate derived from X-rays and Hα results in 1-2 M yr −1 . Since galactic superwinds, giant kpc-scale galactic outflows, seem to be a common phenomenon observed in a number of edge-on galaxies, especially in the X-ray regime, and are produced by excess star-formation activity, the existence of hot halo gas as found in NGC 2903 can be attributed to events such as central starbursts. That such a starburst has taken place in NGC 2903 must be proven. The detection of hot gas above galaxy disks also with intermediate inclination, however, encounters the difficulty of discriminating between that contribution from disk and active nuclear region.

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The infrared and radio morphology of the 'hot-spot' galaxy NGC 2903

Cited by 26 publications

References 0 publications

Nuclear star formation in the hotspot galaxy NGC 2903

Nuclear star formation in the hotspot galaxy NGC 2903

An optical search for supernova remnants in the nearby spiral galaxy NGC 2903

An X-ray halo in the “hot-spot” galaxy NGC 2903

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