scholarly journals Disk Galaxies in the Outer Local Supercluster: Optical CCD Surface Photometry and Distribution of Galaxy Disk Parameters

1998 ◽  
Vol 506 (2) ◽  
pp. 673-685 ◽  
Author(s):  
Nanyao Y. Lu
Keyword(s):  
Disk Galaxies ◽  
Surface Photometry ◽  
Local Supercluster ◽  
Galaxy Disk

Optical Surface Photometry of a Sample of Disk Galaxies. I. Observations and Data Reduction

2000 ◽  
Vol 119 (4) ◽  
pp. 1638-1644 ◽  
Author(s):  
J. A. L. Aguerri ◽  
A. M. Varela ◽  
M. Prieto ◽  
C. Muñoz-Tuñón
Keyword(s):  
Data Reduction ◽  
Disk Galaxies ◽  
Surface Photometry ◽  
Optical Surface

Ultra-Deep Near Infrared Surface Photometry of Edge-on Disk Galaxies

2001 ◽  
pp. 329-329
Author(s):  
A. Guijarro ◽  
R. Peletier ◽  
R. De Grijs ◽  
J. Jiménez-Vicente ◽  
E. Battaner
Keyword(s):  
Near Infrared ◽  
Disk Galaxies ◽  
Surface Photometry

Structure and Morphology of Disk Galaxies with Visible and NIR Surface Photometry

2001 ◽  
pp. 129-132
Author(s):  
A. Guijarro ◽  
R. Peletier ◽  
R. De Grijs ◽  
J. Jiménez-Vicente ◽  
E. Battaner
Keyword(s):  
Disk Galaxies ◽  
Surface Photometry ◽  
Structure And Morphology

scholarly journals A star-forming dwarf galaxy candidate in the halo of NGC 4634

2018 ◽  
Vol 620 ◽  
pp. A29 ◽  
Author(s):  
Y. Stein ◽  
D. J. Bomans ◽  
P. Kamphuis ◽  
E. Jütte ◽  
M. Langener ◽  
...  
Keyword(s):  
Star Formation Rate ◽  
Dwarf Galaxy ◽  
Formation Rate ◽  
Disk Galaxies ◽  
Oxygen Abundance ◽  
Star Forming ◽  
The Galaxy ◽  
Galaxy Disk ◽  
Projected Distance

Context. The halos of disk galaxies form a crucial connection between the galaxy disk and the intergalactic medium. Massive stars, H II regions, or dwarf galaxies located in the halos of galaxies are potential tracers of recent accretion and/or outflows of gas, and are additional contributors to the photon field and the gas phase metallicity. Aims. We investigate the nature and origin of a star-forming dwarf galaxy candidate located in the halo of the edge-on Virgo galaxy NGC 4634 with a projected distance of 1.4 kpc and a Hα star formation rate of ∼4.7 × 10−3 M⊙ yr−1 in order to increase our understanding of these disk-halo processes. Methods. With optical long-slit spectra we measured fluxes of optical nebula emission lines to derive the oxygen abundance 12 + log(O/H) of an H II region in the disk of NGC 4634 and in the star-forming dwarf galaxy candidate. Abundances derived from optical long-slit data and from Hubble Space Telescope (HST) r-band data, Hα data, Giant Metrewave Radio Telescope (GMRT) H I data, and photometry of SDSS and GALEX data were used for further analysis. With additional probes of the luminosity–metallicity relation in the B-band from the Hα-luminosity, the H I map, and the relative velocities, we are able to constrain a possible origin of the dwarf galaxy candidate. Results. The high oxygen abundance (12 + log(O/H) ≈ 8.72) of the dwarf galaxy candidate leads to the conclusion that it was formed from pre-enriched material. Analysis of auxiliary data shows that the dwarf galaxy candidate is composed of material originating from NGC 4634. We cannot determine whether this material has been ejected tidally or through other processes, which makes the system highly interesting for follow up observations.

scholarly journals Optical surface photometry of a sample of disk galaxies

2001 ◽  
Vol 367 (2) ◽  
pp. 405-427 ◽  
Author(s):  
M. Prieto ◽  
J. A. L. Aguerri ◽  
A. M. Varela ◽  
C. Muñoz-Tuñón
Keyword(s):  
Disk Galaxies ◽  
Surface Photometry ◽  
Optical Surface

scholarly journals Surface Photometry of Pure Disk Galaxies

1984 ◽  
Vol 78 ◽  
pp. 385-387
Author(s):  
C. Carignan
Keyword(s):  
Star Formation ◽  
Disk Galaxies ◽  
Surface Photometry

AbstractSurface photometry from U.K.S.T.U. plates in U, BJ and RF is presented for the three Sculptor Group galaxies NGC 7793, NGC 247 and NGC 300. Their photometric parameters are derived and compared to those of M33. Our color maps are used to sort out the data into blue and red pixels where the blue pixels profiles are expected to be rather irregular, representative of the clumpy locations of areas of recent star formation while the red pixels profiles should approximate the smoother distribution of the old disk population.

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