dc.contributor.author | Kaufman, Michele | |
dc.contributor.author | Brinks, E. | |
dc.contributor.author | Struck, Curtis | |
dc.contributor.author | Elmegreen, Bruce G. | |
dc.contributor.author | Elmegreen, Debra M. | |
dc.date.accessioned | 2015-08-18T08:58:35Z | |
dc.date.available | 2015-08-18T08:58:35Z | |
dc.date.issued | 2015-09 | |
dc.identifier.citation | Kaufman , M , Brinks , E , Struck , C , Elmegreen , B G & Elmegreen , D M 2015 , ' A Warp in Progress : H I and Radio Continuum Observations of the Spiral NGC 3145 ' , The Astronomical Journal , vol. 150 , no. 3 , 65 . https://doi.org/10.1088/0004-6256/150/3/65 | |
dc.identifier.issn | 0004-6256 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1504.03236v2 | |
dc.identifier.other | ORCID: /0000-0002-7758-9699/work/30407794 | |
dc.identifier.uri | http://hdl.handle.net/2299/16267 | |
dc.description | Date of Acceptance: 16/06/2015 | |
dc.description.abstract | We present VLA H I and 6 cm radio continuum observations of the spiral NGC 3145 and H I observations of its two companions, NGC 3143 and PGC 029578. In optical images NGC 3145 has stellar arms that appear to cross, forming "X"-features. Our radio continuum observations rule out shock fronts at 3 of the 4 "X"-features. In the middle-to-outer disk, the H I line-profiles of NGC 3145 are skewed. Relative to the disk, the gas in the skewed wing of the line-profiles has z-motions away from us on the approaching side of the galaxy and z-motions of about the same magnitude (about 40 km/s) towards us on the receding side. These warping motions imply that there has been a perturbation with a sizeable component perpendicular to the disk over large spatial scales. Two features in NGC 3145 have velocities indicating that they are out-of-plane tidal arms. One is an apparent branch of a main spiral arm; the velocity of the branch is 150 km/s greater than the spiral arm where they appear to intersect in projection. The other is an arm that forms 3 of the "X"-features. It differs in velocity by 56 km/s from the disk at the same projected location. Based on its SFR and H I properties, NGC 3143 is the more likely of the two companions to have interacted with NGC 3145 recently. A simple analytic model demonstrates that an encounter between NGC 3143 and NGC 3145 is a plausible explanation for the observed warping motions in NGC 3145. | en |
dc.format.extent | 21 | |
dc.format.extent | 1857274 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astronomical Journal | |
dc.subject | astro-ph.GA | |
dc.title | A Warp in Progress : H I and Radio Continuum Observations of the Spiral NGC 3145 | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1088/0004-6256/150/3/65 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |