The nonlinear least square fitting for rotation curve of orion dwarf spiral

The basis of the nonlinear least square fitting is to fit the nonlinear rotation curve model with the observed rotation curve of the Orion dwarf galaxy. It has been the most powerful tool to study the distribution of dark matter in galaxies where it is used to obtain the proper mass model of a galax...

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Main Authors:	Hashim, N., Abidin, Z.Z., Ibrahim, U.F.S.U., Hassan, M.S.R., Hamidi, Z.S., Umar, R., Ibrahim, Z.A.
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2015
Online Access:	http://journalarticle.ukm.my/8489/ http://journalarticle.ukm.my/8489/ http://journalarticle.ukm.my/8489/1/18_N._Hashim.pdf

id	ukm-8489
recordtype	eprints
spelling	ukm-84892016-12-14T06:47:19Z http://journalarticle.ukm.my/8489/ The nonlinear least square fitting for rotation curve of orion dwarf spiral Hashim, N. Abidin, Z.Z. Ibrahim, U.F.S.U. Hassan, M.S.R. Hamidi, Z.S. Umar, R. Ibrahim, Z.A. The basis of the nonlinear least square fitting is to fit the nonlinear rotation curve model with the observed rotation curve of the Orion dwarf galaxy. It has been the most powerful tool to study the distribution of dark matter in galaxies where it is used to obtain the proper mass model of a galaxy. In this paper, we present the rotation curve fit of Orion dwarf galaxy, corrected for asymmetric drift by using the gradient method of nonlinear least square. Our results showed an excellent agreement between the mass models of cored halo profile with the observed rotation curve. Thus, we can estimate the value of disk mass, MD; the core radius, r0 and core density, ro of the galaxy with 1-s of uncertainty. We finally indicated the dark matter halo distribution as cored dark matter halo with density, 3.9 × 106MŸ kpc-3. Universiti Kebangsaan Malaysia 2015-03 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/8489/1/18_N._Hashim.pdf Hashim, N. and Abidin, Z.Z. and Ibrahim, U.F.S.U. and Hassan, M.S.R. and Hamidi, Z.S. and Umar, R. and Ibrahim, Z.A. (2015) The nonlinear least square fitting for rotation curve of orion dwarf spiral. Sains Malaysiana, 44 (3). pp. 457-462. ISSN 0126-6039 http://www.ukm.my/jsm/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	The basis of the nonlinear least square fitting is to fit the nonlinear rotation curve model with the observed rotation curve of the Orion dwarf galaxy. It has been the most powerful tool to study the distribution of dark matter in galaxies where it is used to obtain the proper mass model of a galaxy. In this paper, we present the rotation curve fit of Orion dwarf galaxy, corrected for asymmetric drift by using the gradient method of nonlinear least square. Our results showed an excellent agreement between the mass models of cored halo profile with the observed rotation curve. Thus, we can estimate the value of disk mass, MD; the core radius, r0 and core density, ro of the galaxy with 1-s of uncertainty. We finally indicated the dark matter halo distribution as cored dark matter halo with density, 3.9 × 106MŸ kpc-3.
format	Article
author	Hashim, N. Abidin, Z.Z. Ibrahim, U.F.S.U. Hassan, M.S.R. Hamidi, Z.S. Umar, R. Ibrahim, Z.A.
spellingShingle	Hashim, N. Abidin, Z.Z. Ibrahim, U.F.S.U. Hassan, M.S.R. Hamidi, Z.S. Umar, R. Ibrahim, Z.A. The nonlinear least square fitting for rotation curve of orion dwarf spiral
author_facet	Hashim, N. Abidin, Z.Z. Ibrahim, U.F.S.U. Hassan, M.S.R. Hamidi, Z.S. Umar, R. Ibrahim, Z.A.
author_sort	Hashim, N.
title	The nonlinear least square fitting for rotation curve of orion dwarf spiral
title_short	The nonlinear least square fitting for rotation curve of orion dwarf spiral
title_full	The nonlinear least square fitting for rotation curve of orion dwarf spiral
title_fullStr	The nonlinear least square fitting for rotation curve of orion dwarf spiral
title_full_unstemmed	The nonlinear least square fitting for rotation curve of orion dwarf spiral
title_sort	nonlinear least square fitting for rotation curve of orion dwarf spiral
publisher	Universiti Kebangsaan Malaysia
publishDate	2015
url	http://journalarticle.ukm.my/8489/ http://journalarticle.ukm.my/8489/ http://journalarticle.ukm.my/8489/1/18_N._Hashim.pdf
first_indexed	2023-09-18T19:52:26Z
last_indexed	2023-09-18T19:52:26Z
_version_	1777406308369039360

The nonlinear least square fitting for rotation curve of orion dwarf spiral

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