Intermediate-band surface photometry of the edge-on galaxy NGC 4565

Hong Wu, David Burstein, Zugan Deng, Xu Zhou, Zhaohui Shang, Zhongyuan Zheng, Jiansheng Chen, Hongjun Su, Rogier Windhorst, Wen Ping Chen, Zhenlong Zou, Xiaoyang Xia, Zhaoji Jiang, Jun Ma, Suijian Xue, Jin Zhu, Fuzhen Cheng, Yong Ik Byun, Rui Chen, Licai Deng & 12 others Xiaohui Fan, Li Zhi Fang, Xu Kong, Yong Li, Weipeng Lin, Phillip Lu, Wei Hsin Sun, Wean Shun Tsay, Wen Xu, Haojing Yan, Bing Zhao, Zheng Zheng

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

We present a deep, 42.79 hr image of the nearby, edge-on galaxy NGC 4565 in the Beijing-Arizona-Taipei-Connecticut 6660 Å 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 Å, corresponding to a distance of 22 kpc from the center of the disk. The integrated magnitude of NGC 4565 in our filter is m6660 = 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 x2 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 findthe 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.

Original languageEnglish (US)
Pages (from-to)1364-1380
Number of pages17
JournalAstronomical Journal
Volume123
Issue number3 1755
DOIs
StatePublished - Mar 2002

Fingerprint

photometry
galaxies
power law
halos
brightness
Schmidt telescopes
astronomical observatories
radii
scale height
observatory
parameter
two dimensional models
filter
format
charge coupled devices
China
cut-off
stations
plots
luminosity

Keywords

  • Galaxies: bulges
  • Galaxies: halos
  • Galaxies: individual (NGC 4565)
  • Galaxies: photometry
  • Galaxies: structure

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Wu, H., Burstein, D., Deng, Z., Zhou, X., Shang, Z., Zheng, Z., ... Zheng, Z. (2002). Intermediate-band surface photometry of the edge-on galaxy NGC 4565. Astronomical Journal, 123(3 1755), 1364-1380. https://doi.org/10.1086/338849

Intermediate-band surface photometry of the edge-on galaxy NGC 4565. / Wu, Hong; Burstein, David; Deng, Zugan; Zhou, Xu; Shang, Zhaohui; Zheng, Zhongyuan; Chen, Jiansheng; Su, Hongjun; Windhorst, Rogier; Chen, Wen Ping; Zou, Zhenlong; Xia, Xiaoyang; Jiang, Zhaoji; Ma, Jun; Xue, Suijian; Zhu, Jin; Cheng, Fuzhen; Byun, Yong Ik; Chen, Rui; Deng, Licai; Fan, Xiaohui; Fang, Li Zhi; Kong, Xu; Li, Yong; Lin, Weipeng; Lu, Phillip; Sun, Wei Hsin; Tsay, Wean Shun; Xu, Wen; Yan, Haojing; Zhao, Bing; Zheng, Zheng.

In: Astronomical Journal, Vol. 123, No. 3 1755, 03.2002, p. 1364-1380.

Research output: Contribution to journalArticle

Wu, H, Burstein, D, Deng, Z, Zhou, X, Shang, Z, Zheng, Z, Chen, J, Su, H, Windhorst, R, Chen, WP, Zou, Z, Xia, X, Jiang, Z, Ma, J, Xue, S, Zhu, J, Cheng, F, Byun, YI, Chen, R, Deng, L, Fan, X, Fang, LZ, Kong, X, Li, Y, Lin, W, Lu, P, Sun, WH, Tsay, WS, Xu, W, Yan, H, Zhao, B & Zheng, Z 2002, 'Intermediate-band surface photometry of the edge-on galaxy NGC 4565', Astronomical Journal, vol. 123, no. 3 1755, pp. 1364-1380. https://doi.org/10.1086/338849
Wu H, Burstein D, Deng Z, Zhou X, Shang Z, Zheng Z et al. Intermediate-band surface photometry of the edge-on galaxy NGC 4565. Astronomical Journal. 2002 Mar;123(3 1755):1364-1380. https://doi.org/10.1086/338849
Wu, Hong ; Burstein, David ; Deng, Zugan ; Zhou, Xu ; Shang, Zhaohui ; Zheng, Zhongyuan ; Chen, Jiansheng ; Su, Hongjun ; Windhorst, Rogier ; Chen, Wen Ping ; Zou, Zhenlong ; Xia, Xiaoyang ; Jiang, Zhaoji ; Ma, Jun ; Xue, Suijian ; Zhu, Jin ; Cheng, Fuzhen ; Byun, Yong Ik ; Chen, Rui ; Deng, Licai ; Fan, Xiaohui ; Fang, Li Zhi ; Kong, Xu ; Li, Yong ; Lin, Weipeng ; Lu, Phillip ; Sun, Wei Hsin ; Tsay, Wean Shun ; Xu, Wen ; Yan, Haojing ; Zhao, Bing ; Zheng, Zheng. / Intermediate-band surface photometry of the edge-on galaxy NGC 4565. In: Astronomical Journal. 2002 ; Vol. 123, No. 3 1755. pp. 1364-1380.
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title = "Intermediate-band surface photometry of the edge-on galaxy NGC 4565",
abstract = "We present a deep, 42.79 hr image of the nearby, edge-on galaxy NGC 4565 in the Beijing-Arizona-Taipei-Connecticut 6660 {\AA} 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 {\AA}, corresponding to a distance of 22 kpc from the center of the disk. The integrated magnitude of NGC 4565 in our filter is m6660 = 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 x2 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 findthe 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.",
keywords = "Galaxies: bulges, Galaxies: halos, Galaxies: individual (NGC 4565), Galaxies: photometry, Galaxies: structure",
author = "Hong Wu and David Burstein and Zugan Deng and Xu Zhou and Zhaohui Shang and Zhongyuan Zheng and Jiansheng Chen and Hongjun Su and Rogier Windhorst and Chen, {Wen Ping} and Zhenlong Zou and Xiaoyang Xia and Zhaoji Jiang and Jun Ma and Suijian Xue and Jin Zhu and Fuzhen Cheng and Byun, {Yong Ik} and Rui Chen and Licai Deng and Xiaohui Fan and Fang, {Li Zhi} and Xu Kong and Yong Li and Weipeng Lin and Phillip Lu and Sun, {Wei Hsin} and Tsay, {Wean Shun} and Wen Xu and Haojing Yan and Bing Zhao and Zheng Zheng",
year = "2002",
month = "3",
doi = "10.1086/338849",
language = "English (US)",
volume = "123",
pages = "1364--1380",
journal = "Astronomical Journal",
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TY - JOUR

T1 - Intermediate-band surface photometry of the edge-on galaxy NGC 4565

AU - Wu, Hong

AU - Burstein, David

AU - Deng, Zugan

AU - Zhou, Xu

AU - Shang, Zhaohui

AU - Zheng, Zhongyuan

AU - Chen, Jiansheng

AU - Su, Hongjun

AU - Windhorst, Rogier

AU - Chen, Wen Ping

AU - Zou, Zhenlong

AU - Xia, Xiaoyang

AU - Jiang, Zhaoji

AU - Ma, Jun

AU - Xue, Suijian

AU - Zhu, Jin

AU - Cheng, Fuzhen

AU - Byun, Yong Ik

AU - Chen, Rui

AU - Deng, Licai

AU - Fan, Xiaohui

AU - Fang, Li Zhi

AU - Kong, Xu

AU - Li, Yong

AU - Lin, Weipeng

AU - Lu, Phillip

AU - Sun, Wei Hsin

AU - Tsay, Wean Shun

AU - Xu, Wen

AU - Yan, Haojing

AU - Zhao, Bing

AU - Zheng, Zheng

PY - 2002/3

Y1 - 2002/3

N2 - We present a deep, 42.79 hr image of the nearby, edge-on galaxy NGC 4565 in the Beijing-Arizona-Taipei-Connecticut 6660 Å 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 Å, corresponding to a distance of 22 kpc from the center of the disk. The integrated magnitude of NGC 4565 in our filter is m6660 = 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 x2 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 findthe 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.

AB - We present a deep, 42.79 hr image of the nearby, edge-on galaxy NGC 4565 in the Beijing-Arizona-Taipei-Connecticut 6660 Å 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 Å, corresponding to a distance of 22 kpc from the center of the disk. The integrated magnitude of NGC 4565 in our filter is m6660 = 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 x2 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 findthe 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.

KW - Galaxies: bulges

KW - Galaxies: halos

KW - Galaxies: individual (NGC 4565)

KW - Galaxies: photometry

KW - Galaxies: structure

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DO - 10.1086/338849

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EP - 1380

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