The Correlation Between Fluxes of Balmer Emission Lines of H? and H? and Colors of a Galaxy in VNIR Region

  • Layali AL-Mashhadani Dr.
Keywords: Galaxies, Line profiles, Balmer decrement., Spectra

Abstract

ABSTRACT

We have studied the correlation between the flux and colors of a galaxy sample from SDSS, Data Release 13 as measured by the standard Balmer decrement technique in both visible and near-infrared region, covering the spectral region from (4500-8500) Ao.

We analyzed the spectral properties of the sample in the three (g, r, i) optical bands and found that the main sample tends to be redder which gives an indication that the sample has higher metallicity or older age.

We carried out the standard procedures IRAF software package to get a deeper insight into the flux in Hβ and Hα wavelengths range.

We have concluded that the distribution of H- Beta and H- alpha line profiles is Gaussian in the two regions.

We found also a linear correlation between Balmer decrement (Hα /Hβ ) in lognormal units and the rest frame colors of the sample with the best fit of 3.4764.

 Mean and root means square (rms) profiles of Hβ and Hα shows a maximum peak in the red region at the radial velocity of 1000km/s and the profiles were high symmetry in this region.

Downloads

Download data is not yet available.

References

Chris Stoughton, R., Lupton, M., Michael R., B., Scott Burles, F., Castander, A., Connolly, D., E., Joshua, F., Hennessy, R., Hindsley, et. al., Sloan digital sky survey: Early data release, The Astronomical Journal, 123:485–548, 2002 January

http://iopscience.iop.org/article/10.1086/324741/pdf

Claus Leitherer and Daniela Calzetti, Ultraviolet spectra of star-forming galaxies with time-dependent dust obscuration, The Astrophysical Journal, 574:114–125, 2002

doi: 10.1086/340902

Brent Groves, Jarle Brinchmann1 , and Carl Jakob Walcher, The Balmer decrement of SDSS galaxies, astro-ph. CO, 2011

https://arxiv.org/pdf/1109.2597.pdf

A.R. Thakar, A.S. Szalay, and J.V. Vandenberg, Data Organization in the SDSS Data Release 1, ASP Conference Series, Vol. 295, 2003

Alexander S. Szalay, J., Ani R. Thakar, P., Tanu Malik, J., Christopher Stoughton, J., The SDSS SkyServer – Public Access to the Sloan Digital Sky Server Data, ACM SIGMOD 2002 proceedings

https://arxiv.org/ftp/cs/papers/0202/0202013.pdf

Christy A. Tremonti, T., Guinevere Kauffmann, J., Ste´phane Charlot, S., Mark Seibert, E. David J., A. , Masataka Fukugita, J., The origin of the mass-metallicity relation: insight from 53,000 star-forming galaxies in the Sloan Digital Sky Survey, The Astrophysical Journal, 613:898–913, 2004

http://iopscience.iop.org/article/10.1086/423264/pdf

David J., Douglas P. and Marc Davis, Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds, The Astrophysical Journal, 500:525 553, 1998

http://iopscience.iop.org/article/10.1086/305772/fulltext/

Nikhil Padmanabhan, D., Douglas P., J., Michael R., H., James E., M., David W., Z. , David Johnston, S., et. al., An improved photometric calibration of the Sloan Digital Survey Data, The Astrophysical Journal, 674:1217Y1233, 2008

http://iopscience.iop.org/article/10.1086/524677/pdf

L. S. Sparke & J. S. Gallagher, 2007, Galaxies in the Universe: An Introduction, Second edition, Cambridge University Press

A. I. Shapovalova, L., A. N. Burenkov, V., D. Ilic´, A., W. Kollatschny, J., N., J. R. Valdes, J., J. Leon, A., et. al., Spectral optical monitoring of the narrow-line Seyfert 1 galaxy Ark 564, The Astrophysical Journal Supplement Series, 202:10 (22pp), 2012

doi:10.1088/0067-0049/202/1/10

Published
2019-05-06
Section
Articles