Warp or Lag? The Ionized and Neutral Hydrogen Gas in the Edge-on Dwarf Galaxy UGC 1281

P. Kamphuis*, R. F. Peletier, P. C. van der Kruit, G. H. Heald

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

The properties of gas in the halos of galaxies tell us something about the properties of the interstellar medium. Here we report on deep HI and Hα observations of UGC 1281 in order to determine the existence of extra planar gas and its kinematics. This is the first time the halo characteristics of a dwarf galaxy have been investigated. These observations are compared to 3D models in order to determine the distribution of HI in the galaxy. We find that UGC 1281 has Hα emission up to 25 '' (655 pc,˜0.6 Hα hR) in projection above the plane and in general a low Hα flux. Its HI extends 70 '' (1.8 kpc,˜1.5 HI hR) in projection from the plane. This neutral extra-planar gas can be explained by either a line-of-sight warp or a thick disk with rotational velocities that decline with a vertical gradient of 10.6±3.7 km s-1 kpc-1. The line-of-sight warp model is the preferred model as it is conceptually simpler. In either model the warp starts well within the optical radius.
Original languageEnglish
Title of host publicationDwarf Galaxies
Subtitle of host publicationKeys to Galaxy Formation and Evolution
EditorsP Papaderos, S Recchi, G Hensler
Place of PublicationNEW YORK
PublisherSpringer Berlin Heidelberg
Pages269-273
Number of pages5
Volume28
ISBN (Electronic)978-3-642-22018-0
ISBN (Print)978-3-642-22017-3
DOIs
Publication statusPublished - 2012
EventJoint European and National Astronomy Meeting (JENAM)/18th Annual Meeting of the European-Astronomical-Society/20th Annual Portuguese Meeting of Astronomy and Astrophysics/Symposium 7 - Square Kilometre Array (SKA) - , Portugal
Duration: 6-Sep-201010-Sep-2010

Publication series

NameAstrophysics and Space Science Proceedings
PublisherSPRINGER
ISSN (Print)1570-6591

Other

OtherJoint European and National Astronomy Meeting (JENAM)/18th Annual Meeting of the European-Astronomical-Society/20th Annual Portuguese Meeting of Astronomy and Astrophysics/Symposium 7 - Square Kilometre Array (SKA)
Country/TerritoryPortugal
Period06/09/201010/09/2010

Keywords

  • FIELD UNIT OBSERVATIONS
  • SPIRAL GALAXIES
  • HALO
  • NGC-891
  • KINEMATICS

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