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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents

ID: 13493.0, MPI für Astrophysik / Cosmology
Intermediate-band surface photometry of the edge-on galaxy NGC 4565
Authors:Wu, H.; Burstein, D.; Deng, Z. G.; Zhou, X.; Shang, Z. H.; Zheng, Z. Y.; Chen, J. S.; Su, H. J.; Windhorst, R. A.; Chen, W. P.; Zou, Z. L.; Xia, X. Y.; Jiang, Z. J.; Ma, J.; Xue, S. J.; Zhu, J.; Cheng, F. Z.; Byun, Y. I.; Chen, R.; Deng, L. C.; Fan, X. H.; Fang, L. Z.; Kong, X.; Li, Y.; Lin, W. P.; Lu, P.; Sun, W. H.; Tsay, W. S.; Xu, W.; Yan, H. J.; Zhao, B.; Zheng, Z.
Date of Publication (YYYY-MM-DD):2002-03
Title of Journal:Astronomical Journal
Journal Abbrev.:Astron. J.
Issue / Number:3
Start Page:1364
End Page:1380
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a deep, 42.79 hr image of the nearby, edge-on galaxy NGC 4565 in the Beijing-Arizona-Taipei-Connecticut 6660 Angstrom band using the large-format CCD system on the 0.6 m Schmidt telescope at the Xinglong Station of the National Astronomical Observatories of China. Following the procedures previously developed by our team for the analysis of deep images of galaxies, we obtain a final image that is calibrated to an accuracy of 0.02 mag in zero point and for which we can measure galaxy surface brightness to an accuracy of 0.25 mag at a surface brightness of 27.5 mag arcsec(-2) at 6660 Angstrom, corresponding to a distance of 22 kpc from the center of the disk. The integrated magnitude of NGC 4565 in our filter is m(6660) = 8.99 (=R magnitude of 9.1) to a surface brightness of 28 mag arcsec(-2). We analyze the faint outer parts of this galaxy using a two-dimensional model comprised of three components: an exponential thin disk, an exponential thick disk, and a power-law halo. Combined with a need to provide a cutoff radius for the disk, a total of 12 parameters are included in our model. We determine the best values of our model parameters via 10,000 random initial values, 3700 of which converge to final values. We then plot the chi(2) for each converged fit versus parameter value for each of the 12 parameters. The thin-disk and thick-disk parameters that we determine here are consistent with those of previous studies of this galaxy. However, our very deep image permits a better determination of the power-law fit to the halo, constraining this power law to be between r(-3.2) and r(-4.0), with a best- fit value of r(-3.88). We find the axis ratio of the halo to be 0.44 and its core radius to be 14.4 kpc ( for an adopted distance of 14.5 Mpc). We also agree with others that the bulge of NGC 4565 is fitted well by an exponential luminosity distribution with a scale height similar to that found for the thin disk.
Free Keywords:galaxies : bulges; galaxies : halos; galaxies : individual (NGC 4565); galaxies : photometry; galaxies : structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R; China; Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China; Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA; Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China; Univ Texas, Dept Astron, Austin, TX 78712 USA; Natl Cent Univ, Astron Inst, Chungli 32054, Taiwan; Tianjin Normal Univ, Dept Phys, Tianjin, Peoples R China; Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China; Yonsei Univ, Ctr Space Astrophys, Seoul 120749, South Korea; Yonsei Univ, Dept Astron, Seoul 120749, South Korea; Princeton Univ Observ, Princeton, NJ 08544 USA; Univ Arizona, Dept Phys, Tucson, AZ 85721 USA; Acad Sinica, Shanghai Observ, Partner Grp MPI Astrophys, Shanghai 200030, Peoples R China; Western Connecticut State Univ, Dept Phys & Astron, Danbury, CT 06810 USA; Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
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