Erratum: "Two Extreme H I Supershells in the Disturbed Edge-On Galaxy NGC 4631" [A. J. 105,2098(1993)]

Rand, R.; Vanderhulst, Jm

doi:10.1086/116863

Cited by 3 publications

(1 citation statement)

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“…Apparently, the strong interaction with two neighboring galaxies (e.g., Rand & van der Hulst 1994) forced NGC 4631 to undergo intense star formation in the disk as confirmed by Hα imaging data (Rand et al 1992;Wang et al 2001) and high IRAS flux ratios. As a consequence of these violent processes in the plane, extended non-thermal radio continuum (Condon 1987;Hummel et al 1988;Golla & Hummel 1994) and X-ray halos (Vogler & Pietsch 1996;Wang et al 2001;Strickland et al 2004a) could evolve.…”

Section: Ngc 4631mentioning

confidence: 81%

The multi-phase gaseous halos of star forming late-type galaxies

Tüllmann

Pietsch²,

Rossa³

et al. 2006

A&A

150

175

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This study presents first results from an X-ray mini-survey carried out with XMM-Newton to investigate the diffuse Hot Ionized Medium in the halos of nine nearby star-forming edge-on spiral galaxies. Diffuse gaseous X-ray halos are detected in eight of our targets, covering a wide range of star formation rates from quiescent to starburst cases. For four edge-on spiral galaxies, namely NGC 3044, NGC 3221, NGC 4634, and NGC 5775, we present the first published high resolution/sensitivity detections of extended soft X-ray halos. EPIC X-ray contour maps overlaid onto Hα imaging data reveals that in all cases the presence of X-ray halos is correlated with extraplanar Diffuse Ionized Gas. Moreover, these halos are also associated with non-thermal cosmic ray halos, as evidenced by radio continuum observations. Supplemental UV-data obtained with the OM-telescope at 210 nm show Diffuse Ionized Gas to be well associated with UV emission originating in the underlying disk. Beside NGC 891, NGC 4634 is the second non-starburst galaxy with a diffuse soft X-ray halo (|z| ≤ 4 kpc). In case of NGC 3877, for which we also present the first high resolution X-ray imaging data, no halo emission is detectable. EPIC pn spectra (0.3-12 keV) of the diffuse X-ray emission are extracted at different offset positions from the disk, giving evidence to a significant decrease of gas temperatures, electron densities, and gas masses with increasing distance to the plane. A comparison between dynamical and radiative cooling time scales implies that the outflow in all targets is likely to be sustained. We find very strong indications that spatially correlated multi-phase gaseous halos are created by star forming activity in the disk plane. In a forthcoming paper, we will present multi-frequency luminosity relations and evaluate key parameters which might trigger the formation of multi-phase galaxy halos.

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Section: Ngc 4631mentioning

confidence: 81%

The multi-phase gaseous halos of star forming late-type galaxies

Tüllmann

Pietsch²,

Rossa³

et al. 2006

A&A

150

175

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High-Velocity Clouds

Wakker

Woerden

2013

Planets, Stars and Stellar Systems

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A blind H��i survey in the Canes Venatici region

Kovač

Oosterloo

Hulst

2009

Monthly Notices of the Royal Astronomical Society

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We have carried out a blind H I survey using the Westerbork Synthesis Radio Telescope to make an inventory of objects with small H I masses (between 10 6 and 10 8 M ) and to constrain the low-mass end of the H I mass function. The survey has been conducted in a part of the volume containing the nearby Canes Venatici groups of galaxies. The surveyed region covers an area on the sky of about 86 deg 2 and a range in velocity from about −450 to about 1330 km s −1 . We find 70 sources in the survey by applying an automated searching algorithm. Two of the detections have not been catalogued previously, but they can be assigned an optical counterpart, based on visual inspection of the second-generation Digital Sky Survey images. Only one of the H I detections is without an optical counterpart. This object is detected in the vicinity of NGC 4822, and it has been already detected in previous H I studies. 19 of the objects have been detected for the first time in the 21-cm emission line in this survey. The distribution of the H I properties of our detections confirms our ability to find low-mass objects. 86 per cent of the detections have profile widths less than 130 km s −1 , and they can be considered dwarf galaxy candidates. The H I fluxes measured imply that this survey goes about 10 times deeper than any previous blind H I survey. The H I mass function and the optical properties of the detected sources will be discussed in future papers.

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Erratum: "Two Extreme H I Supershells in the Disturbed Edge-On Galaxy NGC 4631" [A. J. 105,2098(1993)]

Cited by 3 publications

References 0 publications

The multi-phase gaseous halos of star forming late-type galaxies

The multi-phase gaseous halos of star forming late-type galaxies

High-Velocity Clouds

A blind H��i survey in the Canes Venatici region

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Erratum: "Two Extreme H I Supershells in the Disturbed Edge-On Galaxy NGC 4631" [A. J. 105,2098(1993)]

Cited by 3 publications

References 0 publications

The multi-phase gaseous halos of star forming late-type galaxies

The multi-phase gaseous halos of star forming late-type galaxies

High-Velocity Clouds

A blind H���i survey in the Canes Venatici region

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A blind H��i survey in the Canes Venatici region