Ring structure and warp of NGC 5907

Interaction with dwarf galaxies

Zhaohui Shang, Zhongyuan Zheng, Elias Brinks, Jiansheng Chen, David Burstein, S. U. Hongjun, Yong-Ik Byun, Licai Deng, Zugan Deng, Xiaohui Fan, Zhaoji Jiang, L. I. Yong, Weipeng Lin, Feng Ma, Wei Hsin Sun, Beverley Wills, Rogier A. Windhorst, W. U. Hong, Xiaoyang Xia, X. U. Wen & 5 others Suijian Xue, Haojing Yan, X. U. Zhou, Jin Zhu, Zhenlong Zou

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

The edge-on, nearby spiral galaxy NGC 5907 has long been used as the prototype of a "noninteracting" warped galaxy. We report here the discovery of two interactions with companion dwarf galaxies that substantially change this picture. First, a faint ring structure is discovered around this galaxy that is likely due to the tidal disruption of a companion dwarf spheroidal galaxy. The ring is elliptical in shape with the center of NGC 5907 close to one of the ring's foci. This suggests that the ring material is in orbit around NGC 5907. No gaseous component to the ring has been detected either with deep Hα images or in Very Large Array H i 21 cm line maps. The visible material in the ring has an integrated luminosity ≤108 L, and its brightest part has a color R - I ∼ 0.9. All of these properties are consistent with the ring being a tidally disrupted dwarf spheroidal galaxy. Second, we find that NGC 5907 has a dwarf companion galaxy, PGC 54419, which is projected to be only 36.9 kpc from the center of NGC 5907, close in radial velocity (ΔV = 45 km s-1) to the giant spiral galaxy. This dwarf is seen at the tip of the H I warp and in the direction of the warp. Hence, NGC 5907 can no longer be considered noninteracting but is obviously interacting with its dwarf companions much as the Milky Way interacts with its dwarf galaxies. These results, coupled with the finding by others that dwarf galaxies tend to be found around giant galaxies, suggest that tidal interaction with companions, even if containing a mere 1% of the mass of the parent galaxy, might be sufficient to excite the warps found in the disks of many large spiral galaxies.

Original languageEnglish
JournalAstrophysical Journal
Volume504
Issue number1 PART II
Publication statusPublished - 1998 Jan 1

Fingerprint

ring structures
dwarf galaxies
galaxies
rings
spiral galaxies
interactions
Very Large Array (VLA)
radial velocity
material
luminosity
prototypes
orbits
color

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Shang, Z., Zheng, Z., Brinks, E., Chen, J., Burstein, D., Hongjun, S. U., ... Zou, Z. (1998). Ring structure and warp of NGC 5907: Interaction with dwarf galaxies. Astrophysical Journal, 504(1 PART II).
Shang, Zhaohui ; Zheng, Zhongyuan ; Brinks, Elias ; Chen, Jiansheng ; Burstein, David ; Hongjun, S. U. ; Byun, Yong-Ik ; Deng, Licai ; Deng, Zugan ; Fan, Xiaohui ; Jiang, Zhaoji ; Yong, L. I. ; Lin, Weipeng ; Ma, Feng ; Sun, Wei Hsin ; Wills, Beverley ; Windhorst, Rogier A. ; Hong, W. U. ; Xia, Xiaoyang ; Wen, X. U. ; Xue, Suijian ; Yan, Haojing ; Zhou, X. U. ; Zhu, Jin ; Zou, Zhenlong. / Ring structure and warp of NGC 5907 : Interaction with dwarf galaxies. In: Astrophysical Journal. 1998 ; Vol. 504, No. 1 PART II.
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abstract = "The edge-on, nearby spiral galaxy NGC 5907 has long been used as the prototype of a {"}noninteracting{"} warped galaxy. We report here the discovery of two interactions with companion dwarf galaxies that substantially change this picture. First, a faint ring structure is discovered around this galaxy that is likely due to the tidal disruption of a companion dwarf spheroidal galaxy. The ring is elliptical in shape with the center of NGC 5907 close to one of the ring's foci. This suggests that the ring material is in orbit around NGC 5907. No gaseous component to the ring has been detected either with deep Hα images or in Very Large Array H i 21 cm line maps. The visible material in the ring has an integrated luminosity ≤108 L⊙, and its brightest part has a color R - I ∼ 0.9. All of these properties are consistent with the ring being a tidally disrupted dwarf spheroidal galaxy. Second, we find that NGC 5907 has a dwarf companion galaxy, PGC 54419, which is projected to be only 36.9 kpc from the center of NGC 5907, close in radial velocity (ΔV = 45 km s-1) to the giant spiral galaxy. This dwarf is seen at the tip of the H I warp and in the direction of the warp. Hence, NGC 5907 can no longer be considered noninteracting but is obviously interacting with its dwarf companions much as the Milky Way interacts with its dwarf galaxies. These results, coupled with the finding by others that dwarf galaxies tend to be found around giant galaxies, suggest that tidal interaction with companions, even if containing a mere 1{\%} of the mass of the parent galaxy, might be sufficient to excite the warps found in the disks of many large spiral galaxies.",
author = "Zhaohui Shang and Zhongyuan Zheng and Elias Brinks and Jiansheng Chen and David Burstein and Hongjun, {S. U.} and Yong-Ik Byun and Licai Deng and Zugan Deng and Xiaohui Fan and Zhaoji Jiang and Yong, {L. I.} and Weipeng Lin and Feng Ma and Sun, {Wei Hsin} and Beverley Wills and Windhorst, {Rogier A.} and Hong, {W. U.} and Xiaoyang Xia and Wen, {X. U.} and Suijian Xue and Haojing Yan and Zhou, {X. U.} and Jin Zhu and Zhenlong Zou",
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Shang, Z, Zheng, Z, Brinks, E, Chen, J, Burstein, D, Hongjun, SU, Byun, Y-I, Deng, L, Deng, Z, Fan, X, Jiang, Z, Yong, LI, Lin, W, Ma, F, Sun, WH, Wills, B, Windhorst, RA, Hong, WU, Xia, X, Wen, XU, Xue, S, Yan, H, Zhou, XU, Zhu, J & Zou, Z 1998, 'Ring structure and warp of NGC 5907: Interaction with dwarf galaxies', Astrophysical Journal, vol. 504, no. 1 PART II.

Ring structure and warp of NGC 5907 : Interaction with dwarf galaxies. / Shang, Zhaohui; Zheng, Zhongyuan; Brinks, Elias; Chen, Jiansheng; Burstein, David; Hongjun, S. U.; Byun, Yong-Ik; Deng, Licai; Deng, Zugan; Fan, Xiaohui; Jiang, Zhaoji; Yong, L. I.; Lin, Weipeng; Ma, Feng; Sun, Wei Hsin; Wills, Beverley; Windhorst, Rogier A.; Hong, W. U.; Xia, Xiaoyang; Wen, X. U.; Xue, Suijian; Yan, Haojing; Zhou, X. U.; Zhu, Jin; Zou, Zhenlong.

In: Astrophysical Journal, Vol. 504, No. 1 PART II, 01.01.1998.

Research output: Contribution to journalArticle

TY - JOUR

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T2 - Interaction with dwarf galaxies

AU - Shang, Zhaohui

AU - Zheng, Zhongyuan

AU - Brinks, Elias

AU - Chen, Jiansheng

AU - Burstein, David

AU - Hongjun, S. U.

AU - Byun, Yong-Ik

AU - Deng, Licai

AU - Deng, Zugan

AU - Fan, Xiaohui

AU - Jiang, Zhaoji

AU - Yong, L. I.

AU - Lin, Weipeng

AU - Ma, Feng

AU - Sun, Wei Hsin

AU - Wills, Beverley

AU - Windhorst, Rogier A.

AU - Hong, W. U.

AU - Xia, Xiaoyang

AU - Wen, X. U.

AU - Xue, Suijian

AU - Yan, Haojing

AU - Zhou, X. U.

AU - Zhu, Jin

AU - Zou, Zhenlong

PY - 1998/1/1

Y1 - 1998/1/1

N2 - The edge-on, nearby spiral galaxy NGC 5907 has long been used as the prototype of a "noninteracting" warped galaxy. We report here the discovery of two interactions with companion dwarf galaxies that substantially change this picture. First, a faint ring structure is discovered around this galaxy that is likely due to the tidal disruption of a companion dwarf spheroidal galaxy. The ring is elliptical in shape with the center of NGC 5907 close to one of the ring's foci. This suggests that the ring material is in orbit around NGC 5907. No gaseous component to the ring has been detected either with deep Hα images or in Very Large Array H i 21 cm line maps. The visible material in the ring has an integrated luminosity ≤108 L⊙, and its brightest part has a color R - I ∼ 0.9. All of these properties are consistent with the ring being a tidally disrupted dwarf spheroidal galaxy. Second, we find that NGC 5907 has a dwarf companion galaxy, PGC 54419, which is projected to be only 36.9 kpc from the center of NGC 5907, close in radial velocity (ΔV = 45 km s-1) to the giant spiral galaxy. This dwarf is seen at the tip of the H I warp and in the direction of the warp. Hence, NGC 5907 can no longer be considered noninteracting but is obviously interacting with its dwarf companions much as the Milky Way interacts with its dwarf galaxies. These results, coupled with the finding by others that dwarf galaxies tend to be found around giant galaxies, suggest that tidal interaction with companions, even if containing a mere 1% of the mass of the parent galaxy, might be sufficient to excite the warps found in the disks of many large spiral galaxies.

AB - The edge-on, nearby spiral galaxy NGC 5907 has long been used as the prototype of a "noninteracting" warped galaxy. We report here the discovery of two interactions with companion dwarf galaxies that substantially change this picture. First, a faint ring structure is discovered around this galaxy that is likely due to the tidal disruption of a companion dwarf spheroidal galaxy. The ring is elliptical in shape with the center of NGC 5907 close to one of the ring's foci. This suggests that the ring material is in orbit around NGC 5907. No gaseous component to the ring has been detected either with deep Hα images or in Very Large Array H i 21 cm line maps. The visible material in the ring has an integrated luminosity ≤108 L⊙, and its brightest part has a color R - I ∼ 0.9. All of these properties are consistent with the ring being a tidally disrupted dwarf spheroidal galaxy. Second, we find that NGC 5907 has a dwarf companion galaxy, PGC 54419, which is projected to be only 36.9 kpc from the center of NGC 5907, close in radial velocity (ΔV = 45 km s-1) to the giant spiral galaxy. This dwarf is seen at the tip of the H I warp and in the direction of the warp. Hence, NGC 5907 can no longer be considered noninteracting but is obviously interacting with its dwarf companions much as the Milky Way interacts with its dwarf galaxies. These results, coupled with the finding by others that dwarf galaxies tend to be found around giant galaxies, suggest that tidal interaction with companions, even if containing a mere 1% of the mass of the parent galaxy, might be sufficient to excite the warps found in the disks of many large spiral galaxies.

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Shang Z, Zheng Z, Brinks E, Chen J, Burstein D, Hongjun SU et al. Ring structure and warp of NGC 5907: Interaction with dwarf galaxies. Astrophysical Journal. 1998 Jan 1;504(1 PART II).