The Cold Interstellar Medium

Sancisi, R.

doi:10.1007/978-94-009-0229-9_20

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…Recent detailed kinematical study of HI distribution in galaxies shows distinctive shapes of rotation curves in the two halves, such that in one half of the galaxy the rotation curve rises slowly than in the other half, and reaches the flat part at a larger radius (Sancisi 1996;. In retrospect, this asymmetry in shape is also seen in the earlier work where the rotation curve on the two sides of a major axis was measured (e.g.…”

Section: Asymmetric Shapes Of Rotation Curvesmentioning

confidence: 52%

“…A recent study of a large sample confirms that the rotation curve asymmetry is the norm rather than the exception (Kannappan & Fabricant 2001). In addition, in many cases the shape of the rotation curve in the two halves of a galaxy is observed to be asymmetric, with the curve rising faster in one half of the galaxy than the other half (Sancisi 1996;.…”

Section: Introductionmentioning

confidence: 99%

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Large-scale asymmetry of rotation curves in lopsided spiral galaxies

Jog

2002

A&A

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Abstract. Many spiral galaxies show a large-scale asymmetry with a cos φ dependence in their rotation curves as well as in their morphology, such as M 101 and NGC 628. We show that both these features can be explained by the response of a galactic disk to an imposed lopsided halo potential. A perturbation potential of 5% is deduced for the morphologically lopsided galaxies in the Rix & Zaritsky (1995) sample. This is shown to result in a difference of 10% or ≥20-30 km s −1 in the rotation velocity on the two sides of the major axis. Interestingly, the observed isophotal asymmetry in a typical spiral galaxy is not much smaller and it results in a velocity asymmetry of 7% or ∼14-21 km s −1 . Hence, we predict that most spiral galaxies show a fairly significant rotational asymmetry. The rotation velocity is shown to be maximum along the elongated isophotein agreement with the observations along the SW in M 101, while it is minimum along the opposite direction. This result leads to the distinctive asymmetric shape of the rotation curve which rises more steeply in one half of the galaxy than the other, as observed by . This shape is shown to be a robust feature and would result for any centrally concentrated disk. The net disk lopsidedness and hence the asymmetry in the rotation curve is predicted to increase with radius and hence can be best studied using HI gas as the tracer.

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Section: Asymmetric Shapes Of Rotation Curvesmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Large-scale asymmetry of rotation curves in lopsided spiral galaxies

Jog

2002

A&A

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“…Radial gas surface density profiles in spiral galaxies show quite similar behaviour in relation to the optical disk, irrespective of their morphological type (Sancisi 1995(Sancisi , 1999. Whereas the molecular gas is concentrated towards the inner disk, the HI surface density is generally flat at an average level of 10 M pc −2 over the entire extent of the optical disk (though with some variation from galaxy to galaxy, see Broeils & van Woerden 1994).…”

Section: Introductionmentioning

confidence: 77%

The first detection of Far-Infrared emission associated with an extended HI disk. The case of NGC 891

Popescu

Tuffs²

2003

A&A

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Abstract. Spiral galaxies in the local universe are commonly observed to be embedded in extended disks of neutral hydrogen -the so called "extended HI disks". Based on observations made using the ISOPHOT instrument on board the Infrared Space Observatory, we report the first detection of cold dust in the extended HI disk of a spiral galaxy. The detection was achieved through a dedicated deep Far-Infrared observation of a large field encompassing the entire HI disk of the edge-on spiral galaxy NGC 891. Our discovery indicates that the extended HI disk of NGC 891 is not primordial in origin.

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The Cold Interstellar Medium

Cited by 2 publications

References 15 publications

Large-scale asymmetry of rotation curves in lopsided spiral galaxies

Large-scale asymmetry of rotation curves in lopsided spiral galaxies

The first detection of Far-Infrared emission associated with an extended HI disk. The case of NGC 891

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