Deep intermediate-band surface photometry of NGC 5907

Zhongyuan Zheng, Zhaohui Shang, Hongjun Su, David Burstein, Jiansheng Chen, Zugan Deng, Yong-Ik Byun, Rui Chen, Wen Ping Chen, Licai Deng, Xiaohui Fan, Li Zhi Fang, J. Jeff Hester, Zhaoji Jiang, Yong Li, Weipeng Lin, Wei Hsin Sun, Wean Shun Tsay, Rogier A. Windhorst, Hong Wu & 9 others Xiaoyang Xia, Wen Xu, Suijian Xue, Haojing Yan, Zheng Zheng, Xu Zhou, Jin Zhu, Zhenglong Zou, Phillip Lu

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

Intrigued by the initial report of an extended luminosity distribution perpendicular to the disk of the edge-on Sc galaxy NGC 5907, we have obtained very deep exposures of this galaxy with a Schmidt telescope, large-format CCD. and intermediate-band filters centered at 6660 Å and 8020 Å. These two filters, part of a 15-filter set, are custom designed to avoid the brightest (and most variable) night skylines. As a result, our images are able to go deeper with lower sky noise than those taken with broadband filters at similar effective wavelengths: e.g., 0.6 e - arcsec -2 s -1 for our observations versus 7.4 e - arcsec -2 s -1 for the R-band measures of Morrison et al. In our assessment of both random and systematic errors, we show that the flux level where the errors of observation reach 1 mag arcsec -2 are 29.00 mag arcsec -2 in the 6660 Å image (corresponding to 28.7 in the R band) and 27.4 mag arcsec -2 in the 8020 Å image (essentially on the I-band system). In a previous paper we have shown that NGC 5907 has a luminous ring around it, most plausibly caused by the tidal disruption of a dwarf spheroidal galaxy by the much more massive spiral. Here we show that, for values fainter than 27 R mag arcsec -2 , the surface brightness around NGC 5907 is strongly asymmetric, being mostly brighter on the northwest (ring) side of the galactic midplane. This asymmetry rules out a halo as the cause of the faint surface brightness we see. We find this asymmetry is likely an artifact resulting from a combination of ring light and residual surface brightness at faint levels from stars that our star-masking procedure cannot completely eliminate. The possible existence of an optical face-on warp in NGC 5907, suggested by our Very Large Array H I observations, is too confused with foreground star contamination to be independently studied. Good agreement with the surface photometry of NGC 5907 by other observers leads us to conclude that their data are similarly affected at faint levels by ring light and the residual effects of star masking procedures. Inspection of published images confirm this to be the case. Thus, we conclude that NGC 5907 does not have a faint extended halo.

Original languageEnglish
Pages (from-to)2757-2780
Number of pages24
JournalAstronomical Journal
Volume117
Issue number6
DOIs
Publication statusPublished - 1999 Jan 1

Fingerprint

photometry
filter
filters
stars
brightness
rings
masking
halos
asymmetry
Schmidt telescopes
galaxies
Very Large Array (VLA)
random errors
dwarf galaxies
systematic errors
night
format
artifact
sky
artifacts

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Zheng, Z., Shang, Z., Su, H., Burstein, D., Chen, J., Deng, Z., ... Lu, P. (1999). Deep intermediate-band surface photometry of NGC 5907. Astronomical Journal, 117(6), 2757-2780. https://doi.org/10.1086/300866
Zheng, Zhongyuan ; Shang, Zhaohui ; Su, Hongjun ; Burstein, David ; Chen, Jiansheng ; Deng, Zugan ; Byun, Yong-Ik ; Chen, Rui ; Chen, Wen Ping ; Deng, Licai ; Fan, Xiaohui ; Fang, Li Zhi ; Hester, J. Jeff ; Jiang, Zhaoji ; Li, Yong ; Lin, Weipeng ; Sun, Wei Hsin ; Tsay, Wean Shun ; Windhorst, Rogier A. ; Wu, Hong ; Xia, Xiaoyang ; Xu, Wen ; Xue, Suijian ; Yan, Haojing ; Zheng, Zheng ; Zhou, Xu ; Zhu, Jin ; Zou, Zhenglong ; Lu, Phillip. / Deep intermediate-band surface photometry of NGC 5907. In: Astronomical Journal. 1999 ; Vol. 117, No. 6. pp. 2757-2780.
@article{8087a25b72ed44a79131581df2857c44,
title = "Deep intermediate-band surface photometry of NGC 5907",
abstract = "Intrigued by the initial report of an extended luminosity distribution perpendicular to the disk of the edge-on Sc galaxy NGC 5907, we have obtained very deep exposures of this galaxy with a Schmidt telescope, large-format CCD. and intermediate-band filters centered at 6660 {\AA} and 8020 {\AA}. These two filters, part of a 15-filter set, are custom designed to avoid the brightest (and most variable) night skylines. As a result, our images are able to go deeper with lower sky noise than those taken with broadband filters at similar effective wavelengths: e.g., 0.6 e - arcsec -2 s -1 for our observations versus 7.4 e - arcsec -2 s -1 for the R-band measures of Morrison et al. In our assessment of both random and systematic errors, we show that the flux level where the errors of observation reach 1 mag arcsec -2 are 29.00 mag arcsec -2 in the 6660 {\AA} image (corresponding to 28.7 in the R band) and 27.4 mag arcsec -2 in the 8020 {\AA} image (essentially on the I-band system). In a previous paper we have shown that NGC 5907 has a luminous ring around it, most plausibly caused by the tidal disruption of a dwarf spheroidal galaxy by the much more massive spiral. Here we show that, for values fainter than 27 R mag arcsec -2 , the surface brightness around NGC 5907 is strongly asymmetric, being mostly brighter on the northwest (ring) side of the galactic midplane. This asymmetry rules out a halo as the cause of the faint surface brightness we see. We find this asymmetry is likely an artifact resulting from a combination of ring light and residual surface brightness at faint levels from stars that our star-masking procedure cannot completely eliminate. The possible existence of an optical face-on warp in NGC 5907, suggested by our Very Large Array H I observations, is too confused with foreground star contamination to be independently studied. Good agreement with the surface photometry of NGC 5907 by other observers leads us to conclude that their data are similarly affected at faint levels by ring light and the residual effects of star masking procedures. Inspection of published images confirm this to be the case. Thus, we conclude that NGC 5907 does not have a faint extended halo.",
author = "Zhongyuan Zheng and Zhaohui Shang and Hongjun Su and David Burstein and Jiansheng Chen and Zugan Deng and Yong-Ik Byun and Rui Chen and Chen, {Wen Ping} and Licai Deng and Xiaohui Fan and Fang, {Li Zhi} and Hester, {J. Jeff} and Zhaoji Jiang and Yong Li and Weipeng Lin and Sun, {Wei Hsin} and Tsay, {Wean Shun} and Windhorst, {Rogier A.} and Hong Wu and Xiaoyang Xia and Wen Xu and Suijian Xue and Haojing Yan and Zheng Zheng and Xu Zhou and Jin Zhu and Zhenglong Zou and Phillip Lu",
year = "1999",
month = "1",
day = "1",
doi = "10.1086/300866",
language = "English",
volume = "117",
pages = "2757--2780",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "6",

}

Zheng, Z, Shang, Z, Su, H, Burstein, D, Chen, J, Deng, Z, Byun, Y-I, Chen, R, Chen, WP, Deng, L, Fan, X, Fang, LZ, Hester, JJ, Jiang, Z, Li, Y, Lin, W, Sun, WH, Tsay, WS, Windhorst, RA, Wu, H, Xia, X, Xu, W, Xue, S, Yan, H, Zheng, Z, Zhou, X, Zhu, J, Zou, Z & Lu, P 1999, 'Deep intermediate-band surface photometry of NGC 5907', Astronomical Journal, vol. 117, no. 6, pp. 2757-2780. https://doi.org/10.1086/300866

Deep intermediate-band surface photometry of NGC 5907. / Zheng, Zhongyuan; Shang, Zhaohui; Su, Hongjun; Burstein, David; Chen, Jiansheng; Deng, Zugan; Byun, Yong-Ik; Chen, Rui; Chen, Wen Ping; Deng, Licai; Fan, Xiaohui; Fang, Li Zhi; Hester, J. Jeff; Jiang, Zhaoji; Li, Yong; Lin, Weipeng; Sun, Wei Hsin; Tsay, Wean Shun; Windhorst, Rogier A.; Wu, Hong; Xia, Xiaoyang; Xu, Wen; Xue, Suijian; Yan, Haojing; Zheng, Zheng; Zhou, Xu; Zhu, Jin; Zou, Zhenglong; Lu, Phillip.

In: Astronomical Journal, Vol. 117, No. 6, 01.01.1999, p. 2757-2780.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Deep intermediate-band surface photometry of NGC 5907

AU - Zheng, Zhongyuan

AU - Shang, Zhaohui

AU - Su, Hongjun

AU - Burstein, David

AU - Chen, Jiansheng

AU - Deng, Zugan

AU - Byun, Yong-Ik

AU - Chen, Rui

AU - Chen, Wen Ping

AU - Deng, Licai

AU - Fan, Xiaohui

AU - Fang, Li Zhi

AU - Hester, J. Jeff

AU - Jiang, Zhaoji

AU - Li, Yong

AU - Lin, Weipeng

AU - Sun, Wei Hsin

AU - Tsay, Wean Shun

AU - Windhorst, Rogier A.

AU - Wu, Hong

AU - Xia, Xiaoyang

AU - Xu, Wen

AU - Xue, Suijian

AU - Yan, Haojing

AU - Zheng, Zheng

AU - Zhou, Xu

AU - Zhu, Jin

AU - Zou, Zhenglong

AU - Lu, Phillip

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Intrigued by the initial report of an extended luminosity distribution perpendicular to the disk of the edge-on Sc galaxy NGC 5907, we have obtained very deep exposures of this galaxy with a Schmidt telescope, large-format CCD. and intermediate-band filters centered at 6660 Å and 8020 Å. These two filters, part of a 15-filter set, are custom designed to avoid the brightest (and most variable) night skylines. As a result, our images are able to go deeper with lower sky noise than those taken with broadband filters at similar effective wavelengths: e.g., 0.6 e - arcsec -2 s -1 for our observations versus 7.4 e - arcsec -2 s -1 for the R-band measures of Morrison et al. In our assessment of both random and systematic errors, we show that the flux level where the errors of observation reach 1 mag arcsec -2 are 29.00 mag arcsec -2 in the 6660 Å image (corresponding to 28.7 in the R band) and 27.4 mag arcsec -2 in the 8020 Å image (essentially on the I-band system). In a previous paper we have shown that NGC 5907 has a luminous ring around it, most plausibly caused by the tidal disruption of a dwarf spheroidal galaxy by the much more massive spiral. Here we show that, for values fainter than 27 R mag arcsec -2 , the surface brightness around NGC 5907 is strongly asymmetric, being mostly brighter on the northwest (ring) side of the galactic midplane. This asymmetry rules out a halo as the cause of the faint surface brightness we see. We find this asymmetry is likely an artifact resulting from a combination of ring light and residual surface brightness at faint levels from stars that our star-masking procedure cannot completely eliminate. The possible existence of an optical face-on warp in NGC 5907, suggested by our Very Large Array H I observations, is too confused with foreground star contamination to be independently studied. Good agreement with the surface photometry of NGC 5907 by other observers leads us to conclude that their data are similarly affected at faint levels by ring light and the residual effects of star masking procedures. Inspection of published images confirm this to be the case. Thus, we conclude that NGC 5907 does not have a faint extended halo.

AB - Intrigued by the initial report of an extended luminosity distribution perpendicular to the disk of the edge-on Sc galaxy NGC 5907, we have obtained very deep exposures of this galaxy with a Schmidt telescope, large-format CCD. and intermediate-band filters centered at 6660 Å and 8020 Å. These two filters, part of a 15-filter set, are custom designed to avoid the brightest (and most variable) night skylines. As a result, our images are able to go deeper with lower sky noise than those taken with broadband filters at similar effective wavelengths: e.g., 0.6 e - arcsec -2 s -1 for our observations versus 7.4 e - arcsec -2 s -1 for the R-band measures of Morrison et al. In our assessment of both random and systematic errors, we show that the flux level where the errors of observation reach 1 mag arcsec -2 are 29.00 mag arcsec -2 in the 6660 Å image (corresponding to 28.7 in the R band) and 27.4 mag arcsec -2 in the 8020 Å image (essentially on the I-band system). In a previous paper we have shown that NGC 5907 has a luminous ring around it, most plausibly caused by the tidal disruption of a dwarf spheroidal galaxy by the much more massive spiral. Here we show that, for values fainter than 27 R mag arcsec -2 , the surface brightness around NGC 5907 is strongly asymmetric, being mostly brighter on the northwest (ring) side of the galactic midplane. This asymmetry rules out a halo as the cause of the faint surface brightness we see. We find this asymmetry is likely an artifact resulting from a combination of ring light and residual surface brightness at faint levels from stars that our star-masking procedure cannot completely eliminate. The possible existence of an optical face-on warp in NGC 5907, suggested by our Very Large Array H I observations, is too confused with foreground star contamination to be independently studied. Good agreement with the surface photometry of NGC 5907 by other observers leads us to conclude that their data are similarly affected at faint levels by ring light and the residual effects of star masking procedures. Inspection of published images confirm this to be the case. Thus, we conclude that NGC 5907 does not have a faint extended halo.

UR - http://www.scopus.com/inward/record.url?scp=0000921532&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000921532&partnerID=8YFLogxK

U2 - 10.1086/300866

DO - 10.1086/300866

M3 - Article

VL - 117

SP - 2757

EP - 2780

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 6

ER -

Zheng Z, Shang Z, Su H, Burstein D, Chen J, Deng Z et al. Deep intermediate-band surface photometry of NGC 5907. Astronomical Journal. 1999 Jan 1;117(6):2757-2780. https://doi.org/10.1086/300866