The first hour of extragalactic data of the sloan digital sky survey spectroscopic commissioning

The coma cluster

Francisco J. Castander, Robert C. Nichol, Aronne Merrelli, Scott Burles, Adrian Pope, Andrew J. Connolly, Alan Uomoto, James E. Gunn, John E. Anderson, James Annis, Neta A. Bahcall, William N. Boroski, Jon Brinkmann, Larry Carey, James H. Crocker, I. Csabai, Mamoru Doi, Joshua A. Frieman, Masataka Fukugita, Scott D. Friedman & 33 others Eric J. Hilton, Robert B. Hindsley, Željko Ivezić, Steve Kent, Donald Q. Lamb, R. French Leger, Daniel C. Long, Jon Loveday, Robert H. Lupton, Harvey MacGillivray, Avery Meiksin, Jeffrey A. Munn, Matt Newcomb, Sadanori Okamura, Russell Owen, Jeffrey R. Pier, Constance M. Rockosi, David J. Schlegel, Donald P. Schneider, Walter Seigmund, Stephen Smee, Yehuda Snir, Larry Starkman, Chris Stoughton, G. Szokoly, Christopher Stubbs, Mark SubbaRao, Alex Szalay, Aniruddha R. Thakar, Christy Tremonti, Patrick Waddell, Brian Yanny, Donald G. York

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

On 1999 May 26, one of the Sloan Digital Sky Survey (SDSS) fiber-fed spectrographs saw astronomical first light. This was followed by the first spectroscopic commissioning run during the dark period of 1999 June. We present here the first hour of extragalactic spectroscopy taken during these early commissioning stages: an observation of the Coma cluster of galaxies. Our data samples the southern part of this cluster, out to a radius of 1°.5 (1.8 h-1 Mpc, approximately to the virial radius) and thus fully covers the NGC 4839 group. We outline in this paper the main characteristics of the SDSS spectroscopic systems and provide redshifts and spectral classifications for 196 Coma galaxies, of which 45 redshifts are new. For the 151 galaxies in common with the literature, we find excellent agreement between our redshift determinations and the published values, e.g., for the largest homogeneous sample of galaxies in common (63 galaxies observed by Colless & Dunn) we find a mean offset of 3 km s-1 and an rms scatter of only 24 km s-1. As part of our analysis, we have investigated four different spectral classification algorithms : measurements of the spectral line strengths, a principal component decomposition, a wavelet analysis and the fitting of spectral synthesis models to the data. We find that these classification schemes are in broad agreement and can provide physical insight into the evolutionary histories of our cluster galaxies. We find that a significant fraction (25%) of our observed Coma galaxies show signs of recent star formation activity and that the velocity dispersion of these active galaxies (emission-line and poststarburst galaxies) is 30% larger than the absorption-line galaxies. We also find no active galaxies within the central (projected) 200 h-1 kpc of the cluster. The spatial distribution of our Coma active galaxies is consistent with that found at higher redshift for the CNOC1 cluster survey. Beyond the core region, the fraction of bright active galaxies appears to rise slowly out to the virial radius and are randomly distributed within the cluster with no apparent correlation with the potential merger or postmerger of the NGC 4839 group. We briefly discuss possible origins of this recent galaxy star formation.

Original languageEnglish
Pages (from-to)2331-2357
Number of pages27
JournalAstronomical Journal
Volume121
Issue number5
DOIs
Publication statusPublished - May 2001

Fingerprint

coma
galaxies
active galaxies
wavelet analysis
merger
spectroscopy
decomposition
spatial distribution
radii
star formation
history
spectrographs
line spectra
histories
fibers

Keywords

  • Catalogs
  • Cosmology: observations
  • Galaxies: clusters: individual (Coma)
  • Galaxies: fundamental parameters
  • Methods: data analysis

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Castander, F. J., Nichol, R. C., Merrelli, A., Burles, S., Pope, A., Connolly, A. J., ... York, D. G. (2001). The first hour of extragalactic data of the sloan digital sky survey spectroscopic commissioning: The coma cluster. Astronomical Journal, 121(5), 2331-2357. https://doi.org/10.1086/320384

The first hour of extragalactic data of the sloan digital sky survey spectroscopic commissioning : The coma cluster. / Castander, Francisco J.; Nichol, Robert C.; Merrelli, Aronne; Burles, Scott; Pope, Adrian; Connolly, Andrew J.; Uomoto, Alan; Gunn, James E.; Anderson, John E.; Annis, James; Bahcall, Neta A.; Boroski, William N.; Brinkmann, Jon; Carey, Larry; Crocker, James H.; Csabai, I.; Doi, Mamoru; Frieman, Joshua A.; Fukugita, Masataka; Friedman, Scott D.; Hilton, Eric J.; Hindsley, Robert B.; Ivezić, Željko; Kent, Steve; Lamb, Donald Q.; Leger, R. French; Long, Daniel C.; Loveday, Jon; Lupton, Robert H.; MacGillivray, Harvey; Meiksin, Avery; Munn, Jeffrey A.; Newcomb, Matt; Okamura, Sadanori; Owen, Russell; Pier, Jeffrey R.; Rockosi, Constance M.; Schlegel, David J.; Schneider, Donald P.; Seigmund, Walter; Smee, Stephen; Snir, Yehuda; Starkman, Larry; Stoughton, Chris; Szokoly, G.; Stubbs, Christopher; SubbaRao, Mark; Szalay, Alex; Thakar, Aniruddha R.; Tremonti, Christy; Waddell, Patrick; Yanny, Brian; York, Donald G.

In: Astronomical Journal, Vol. 121, No. 5, 05.2001, p. 2331-2357.

Research output: Contribution to journalArticle

Castander, FJ, Nichol, RC, Merrelli, A, Burles, S, Pope, A, Connolly, AJ, Uomoto, A, Gunn, JE, Anderson, JE, Annis, J, Bahcall, NA, Boroski, WN, Brinkmann, J, Carey, L, Crocker, JH, Csabai, I, Doi, M, Frieman, JA, Fukugita, M, Friedman, SD, Hilton, EJ, Hindsley, RB, Ivezić, Ž, Kent, S, Lamb, DQ, Leger, RF, Long, DC, Loveday, J, Lupton, RH, MacGillivray, H, Meiksin, A, Munn, JA, Newcomb, M, Okamura, S, Owen, R, Pier, JR, Rockosi, CM, Schlegel, DJ, Schneider, DP, Seigmund, W, Smee, S, Snir, Y, Starkman, L, Stoughton, C, Szokoly, G, Stubbs, C, SubbaRao, M, Szalay, A, Thakar, AR, Tremonti, C, Waddell, P, Yanny, B & York, DG 2001, 'The first hour of extragalactic data of the sloan digital sky survey spectroscopic commissioning: The coma cluster', Astronomical Journal, vol. 121, no. 5, pp. 2331-2357. https://doi.org/10.1086/320384
Castander, Francisco J. ; Nichol, Robert C. ; Merrelli, Aronne ; Burles, Scott ; Pope, Adrian ; Connolly, Andrew J. ; Uomoto, Alan ; Gunn, James E. ; Anderson, John E. ; Annis, James ; Bahcall, Neta A. ; Boroski, William N. ; Brinkmann, Jon ; Carey, Larry ; Crocker, James H. ; Csabai, I. ; Doi, Mamoru ; Frieman, Joshua A. ; Fukugita, Masataka ; Friedman, Scott D. ; Hilton, Eric J. ; Hindsley, Robert B. ; Ivezić, Željko ; Kent, Steve ; Lamb, Donald Q. ; Leger, R. French ; Long, Daniel C. ; Loveday, Jon ; Lupton, Robert H. ; MacGillivray, Harvey ; Meiksin, Avery ; Munn, Jeffrey A. ; Newcomb, Matt ; Okamura, Sadanori ; Owen, Russell ; Pier, Jeffrey R. ; Rockosi, Constance M. ; Schlegel, David J. ; Schneider, Donald P. ; Seigmund, Walter ; Smee, Stephen ; Snir, Yehuda ; Starkman, Larry ; Stoughton, Chris ; Szokoly, G. ; Stubbs, Christopher ; SubbaRao, Mark ; Szalay, Alex ; Thakar, Aniruddha R. ; Tremonti, Christy ; Waddell, Patrick ; Yanny, Brian ; York, Donald G. / The first hour of extragalactic data of the sloan digital sky survey spectroscopic commissioning : The coma cluster. In: Astronomical Journal. 2001 ; Vol. 121, No. 5. pp. 2331-2357.
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TY - JOUR

T1 - The first hour of extragalactic data of the sloan digital sky survey spectroscopic commissioning

T2 - The coma cluster

AU - Castander, Francisco J.

AU - Nichol, Robert C.

AU - Merrelli, Aronne

AU - Burles, Scott

AU - Pope, Adrian

AU - Connolly, Andrew J.

AU - Uomoto, Alan

AU - Gunn, James E.

AU - Anderson, John E.

AU - Annis, James

AU - Bahcall, Neta A.

AU - Boroski, William N.

AU - Brinkmann, Jon

AU - Carey, Larry

AU - Crocker, James H.

AU - Csabai, I.

AU - Doi, Mamoru

AU - Frieman, Joshua A.

AU - Fukugita, Masataka

AU - Friedman, Scott D.

AU - Hilton, Eric J.

AU - Hindsley, Robert B.

AU - Ivezić, Željko

AU - Kent, Steve

AU - Lamb, Donald Q.

AU - Leger, R. French

AU - Long, Daniel C.

AU - Loveday, Jon

AU - Lupton, Robert H.

AU - MacGillivray, Harvey

AU - Meiksin, Avery

AU - Munn, Jeffrey A.

AU - Newcomb, Matt

AU - Okamura, Sadanori

AU - Owen, Russell

AU - Pier, Jeffrey R.

AU - Rockosi, Constance M.

AU - Schlegel, David J.

AU - Schneider, Donald P.

AU - Seigmund, Walter

AU - Smee, Stephen

AU - Snir, Yehuda

AU - Starkman, Larry

AU - Stoughton, Chris

AU - Szokoly, G.

AU - Stubbs, Christopher

AU - SubbaRao, Mark

AU - Szalay, Alex

AU - Thakar, Aniruddha R.

AU - Tremonti, Christy

AU - Waddell, Patrick

AU - Yanny, Brian

AU - York, Donald G.

PY - 2001/5

Y1 - 2001/5

N2 - On 1999 May 26, one of the Sloan Digital Sky Survey (SDSS) fiber-fed spectrographs saw astronomical first light. This was followed by the first spectroscopic commissioning run during the dark period of 1999 June. We present here the first hour of extragalactic spectroscopy taken during these early commissioning stages: an observation of the Coma cluster of galaxies. Our data samples the southern part of this cluster, out to a radius of 1°.5 (1.8 h-1 Mpc, approximately to the virial radius) and thus fully covers the NGC 4839 group. We outline in this paper the main characteristics of the SDSS spectroscopic systems and provide redshifts and spectral classifications for 196 Coma galaxies, of which 45 redshifts are new. For the 151 galaxies in common with the literature, we find excellent agreement between our redshift determinations and the published values, e.g., for the largest homogeneous sample of galaxies in common (63 galaxies observed by Colless & Dunn) we find a mean offset of 3 km s-1 and an rms scatter of only 24 km s-1. As part of our analysis, we have investigated four different spectral classification algorithms : measurements of the spectral line strengths, a principal component decomposition, a wavelet analysis and the fitting of spectral synthesis models to the data. We find that these classification schemes are in broad agreement and can provide physical insight into the evolutionary histories of our cluster galaxies. We find that a significant fraction (25%) of our observed Coma galaxies show signs of recent star formation activity and that the velocity dispersion of these active galaxies (emission-line and poststarburst galaxies) is 30% larger than the absorption-line galaxies. We also find no active galaxies within the central (projected) 200 h-1 kpc of the cluster. The spatial distribution of our Coma active galaxies is consistent with that found at higher redshift for the CNOC1 cluster survey. Beyond the core region, the fraction of bright active galaxies appears to rise slowly out to the virial radius and are randomly distributed within the cluster with no apparent correlation with the potential merger or postmerger of the NGC 4839 group. We briefly discuss possible origins of this recent galaxy star formation.

AB - On 1999 May 26, one of the Sloan Digital Sky Survey (SDSS) fiber-fed spectrographs saw astronomical first light. This was followed by the first spectroscopic commissioning run during the dark period of 1999 June. We present here the first hour of extragalactic spectroscopy taken during these early commissioning stages: an observation of the Coma cluster of galaxies. Our data samples the southern part of this cluster, out to a radius of 1°.5 (1.8 h-1 Mpc, approximately to the virial radius) and thus fully covers the NGC 4839 group. We outline in this paper the main characteristics of the SDSS spectroscopic systems and provide redshifts and spectral classifications for 196 Coma galaxies, of which 45 redshifts are new. For the 151 galaxies in common with the literature, we find excellent agreement between our redshift determinations and the published values, e.g., for the largest homogeneous sample of galaxies in common (63 galaxies observed by Colless & Dunn) we find a mean offset of 3 km s-1 and an rms scatter of only 24 km s-1. As part of our analysis, we have investigated four different spectral classification algorithms : measurements of the spectral line strengths, a principal component decomposition, a wavelet analysis and the fitting of spectral synthesis models to the data. We find that these classification schemes are in broad agreement and can provide physical insight into the evolutionary histories of our cluster galaxies. We find that a significant fraction (25%) of our observed Coma galaxies show signs of recent star formation activity and that the velocity dispersion of these active galaxies (emission-line and poststarburst galaxies) is 30% larger than the absorption-line galaxies. We also find no active galaxies within the central (projected) 200 h-1 kpc of the cluster. The spatial distribution of our Coma active galaxies is consistent with that found at higher redshift for the CNOC1 cluster survey. Beyond the core region, the fraction of bright active galaxies appears to rise slowly out to the virial radius and are randomly distributed within the cluster with no apparent correlation with the potential merger or postmerger of the NGC 4839 group. We briefly discuss possible origins of this recent galaxy star formation.

KW - Catalogs

KW - Cosmology: observations

KW - Galaxies: clusters: individual (Coma)

KW - Galaxies: fundamental parameters

KW - Methods: data analysis

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