Spatially resolved spectrophotometry of M81

Age, metallicity, and reddening maps

Xu Kong, Xu Zhou, Jiansheng Chen, Fuzhen Cheng, Zhaoji Jiang, Jin Zhu, Zhongyuan Zheng, Shude Mao, Zhaohui Shang, Xiaohui Fan, Yong Ik Byun, Rui Chen, Wen Ping Chen, Licai Deng, Jeff J. Hester, Yong Li, Weipeng Lin, Hongjun Su, Wei Hsin Sun, Wean Shun Tsay & 8 others Rogier Windhorst, Hong Wu, Xiaoyang Xia, Wen Xu, Suijian Xue, Haojing Yan, Zheng Zheng, Zhenglong Zou

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

In this paper we present a multicolor photometric study of the nearby spiral galaxy M81, using images obtained with the Beijing Astronomical Observatory 60/90 cm Schmidt telescope in 13 intermediate-band filters from 3800 to 10000 Å. The observations cover the whole area of M81, with a total integration of 51 hr from 1995 to 1997 February. This provides a multicolor map of M81 in pixels of 1″7. × 1.″7. Using theoretical stellar population synthesis models, we demonstrate that some BATC (Beijing-Arizona-Taiwan-Connecticut Multicolor Sky Survey) colors and color indices can be used to disentangle the age and metallicity effect. We compare in detail the observed properties of M81 with the predictions from population synthesis models and quantify the relative chemical abundance, age, and reddening distributions for different components of M81. We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an age gradient is found between stellar populations of the central regions and of the bulge and disk regions of M81: the stellar population in its central regions is older than 8 Gyr, while the disk stars are considerably younger (∼2 Gyr). We also give the reddening distribution in M81. Some dust lanes are found in the galaxy bulge region, and the reddening in the outer disk is higher than that in the central regions.

Original languageEnglish (US)
Pages (from-to)2745-2756
Number of pages12
JournalAstronomical Journal
Volume119
Issue number6
StatePublished - Jun 2000

Fingerprint

spectrophotometry
metallicity
Schmidt telescopes
galaxies
color
astronomical observatories
Taiwan
synthesis
spiral galaxies
dust
pixels
pixel
filters
stars
gradients
observatory
filter
predictions
prediction
distribution

Keywords

  • Dust, extinction
  • Galaxies: abundances
  • Galaxies: evolution
  • Galaxies: individual (M81)
  • Galaxies: stellar content

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Kong, X., Zhou, X., Chen, J., Cheng, F., Jiang, Z., Zhu, J., ... Zou, Z. (2000). Spatially resolved spectrophotometry of M81: Age, metallicity, and reddening maps. Astronomical Journal, 119(6), 2745-2756.

Spatially resolved spectrophotometry of M81 : Age, metallicity, and reddening maps. / Kong, Xu; Zhou, Xu; Chen, Jiansheng; Cheng, Fuzhen; Jiang, Zhaoji; Zhu, Jin; Zheng, Zhongyuan; Mao, Shude; Shang, Zhaohui; Fan, Xiaohui; Byun, Yong Ik; Chen, Rui; Chen, Wen Ping; Deng, Licai; Hester, Jeff J.; Li, Yong; Lin, Weipeng; Su, Hongjun; Sun, Wei Hsin; Tsay, Wean Shun; Windhorst, Rogier; Wu, Hong; Xia, Xiaoyang; Xu, Wen; Xue, Suijian; Yan, Haojing; Zheng, Zheng; Zou, Zhenglong.

In: Astronomical Journal, Vol. 119, No. 6, 06.2000, p. 2745-2756.

Research output: Contribution to journalArticle

Kong, X, Zhou, X, Chen, J, Cheng, F, Jiang, Z, Zhu, J, Zheng, Z, Mao, S, Shang, Z, Fan, X, Byun, YI, Chen, R, Chen, WP, Deng, L, Hester, JJ, Li, Y, Lin, W, Su, H, Sun, WH, Tsay, WS, Windhorst, R, Wu, H, Xia, X, Xu, W, Xue, S, Yan, H, Zheng, Z & Zou, Z 2000, 'Spatially resolved spectrophotometry of M81: Age, metallicity, and reddening maps', Astronomical Journal, vol. 119, no. 6, pp. 2745-2756.
Kong X, Zhou X, Chen J, Cheng F, Jiang Z, Zhu J et al. Spatially resolved spectrophotometry of M81: Age, metallicity, and reddening maps. Astronomical Journal. 2000 Jun;119(6):2745-2756.
Kong, Xu ; Zhou, Xu ; Chen, Jiansheng ; Cheng, Fuzhen ; Jiang, Zhaoji ; Zhu, Jin ; Zheng, Zhongyuan ; Mao, Shude ; Shang, Zhaohui ; Fan, Xiaohui ; Byun, Yong Ik ; Chen, Rui ; Chen, Wen Ping ; Deng, Licai ; Hester, Jeff J. ; Li, Yong ; Lin, Weipeng ; Su, Hongjun ; Sun, Wei Hsin ; Tsay, Wean Shun ; Windhorst, Rogier ; Wu, Hong ; Xia, Xiaoyang ; Xu, Wen ; Xue, Suijian ; Yan, Haojing ; Zheng, Zheng ; Zou, Zhenglong. / Spatially resolved spectrophotometry of M81 : Age, metallicity, and reddening maps. In: Astronomical Journal. 2000 ; Vol. 119, No. 6. pp. 2745-2756.
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abstract = "In this paper we present a multicolor photometric study of the nearby spiral galaxy M81, using images obtained with the Beijing Astronomical Observatory 60/90 cm Schmidt telescope in 13 intermediate-band filters from 3800 to 10000 {\AA}. The observations cover the whole area of M81, with a total integration of 51 hr from 1995 to 1997 February. This provides a multicolor map of M81 in pixels of 1″7. × 1.″7. Using theoretical stellar population synthesis models, we demonstrate that some BATC (Beijing-Arizona-Taiwan-Connecticut Multicolor Sky Survey) colors and color indices can be used to disentangle the age and metallicity effect. We compare in detail the observed properties of M81 with the predictions from population synthesis models and quantify the relative chemical abundance, age, and reddening distributions for different components of M81. We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an age gradient is found between stellar populations of the central regions and of the bulge and disk regions of M81: the stellar population in its central regions is older than 8 Gyr, while the disk stars are considerably younger (∼2 Gyr). We also give the reddening distribution in M81. Some dust lanes are found in the galaxy bulge region, and the reddening in the outer disk is higher than that in the central regions.",
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T2 - Age, metallicity, and reddening maps

AU - Kong, Xu

AU - Zhou, Xu

AU - Chen, Jiansheng

AU - Cheng, Fuzhen

AU - Jiang, Zhaoji

AU - Zhu, Jin

AU - Zheng, Zhongyuan

AU - Mao, Shude

AU - Shang, Zhaohui

AU - Fan, Xiaohui

AU - Byun, Yong Ik

AU - Chen, Rui

AU - Chen, Wen Ping

AU - Deng, Licai

AU - Hester, Jeff J.

AU - Li, Yong

AU - Lin, Weipeng

AU - Su, Hongjun

AU - Sun, Wei Hsin

AU - Tsay, Wean Shun

AU - Windhorst, Rogier

AU - Wu, Hong

AU - Xia, Xiaoyang

AU - Xu, Wen

AU - Xue, Suijian

AU - Yan, Haojing

AU - Zheng, Zheng

AU - Zou, Zhenglong

PY - 2000/6

Y1 - 2000/6

N2 - In this paper we present a multicolor photometric study of the nearby spiral galaxy M81, using images obtained with the Beijing Astronomical Observatory 60/90 cm Schmidt telescope in 13 intermediate-band filters from 3800 to 10000 Å. The observations cover the whole area of M81, with a total integration of 51 hr from 1995 to 1997 February. This provides a multicolor map of M81 in pixels of 1″7. × 1.″7. Using theoretical stellar population synthesis models, we demonstrate that some BATC (Beijing-Arizona-Taiwan-Connecticut Multicolor Sky Survey) colors and color indices can be used to disentangle the age and metallicity effect. We compare in detail the observed properties of M81 with the predictions from population synthesis models and quantify the relative chemical abundance, age, and reddening distributions for different components of M81. We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an age gradient is found between stellar populations of the central regions and of the bulge and disk regions of M81: the stellar population in its central regions is older than 8 Gyr, while the disk stars are considerably younger (∼2 Gyr). We also give the reddening distribution in M81. Some dust lanes are found in the galaxy bulge region, and the reddening in the outer disk is higher than that in the central regions.

AB - In this paper we present a multicolor photometric study of the nearby spiral galaxy M81, using images obtained with the Beijing Astronomical Observatory 60/90 cm Schmidt telescope in 13 intermediate-band filters from 3800 to 10000 Å. The observations cover the whole area of M81, with a total integration of 51 hr from 1995 to 1997 February. This provides a multicolor map of M81 in pixels of 1″7. × 1.″7. Using theoretical stellar population synthesis models, we demonstrate that some BATC (Beijing-Arizona-Taiwan-Connecticut Multicolor Sky Survey) colors and color indices can be used to disentangle the age and metallicity effect. We compare in detail the observed properties of M81 with the predictions from population synthesis models and quantify the relative chemical abundance, age, and reddening distributions for different components of M81. We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an age gradient is found between stellar populations of the central regions and of the bulge and disk regions of M81: the stellar population in its central regions is older than 8 Gyr, while the disk stars are considerably younger (∼2 Gyr). We also give the reddening distribution in M81. Some dust lanes are found in the galaxy bulge region, and the reddening in the outer disk is higher than that in the central regions.

KW - Dust, extinction

KW - Galaxies: abundances

KW - Galaxies: evolution

KW - Galaxies: individual (M81)

KW - Galaxies: stellar content

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