SDSS-IV/MaNGA

SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE

Renbin Yan, Christy Tremonti, Matthew A. Bershady, David R. Law, David J. Schlegel, Kevin Bundy, Niv Drory, Nicholas MacDonald, Dmitry Bizyaev, Guillermo A. Blanc, Michael R. Blanton, Brian Cherinka, Arthur Eigenbrot, James E. Gunn, Paul Harding, David W. Hogg, José R. Sánchez-Gallego, Sebastian F. Sánchez, David A. Wake, Anne Marie Weijmans & 2 others Ting Xiao, Kai Zhang

    Research output: Contribution to journalArticle

    Abstract

    Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV, is an integral-field spectroscopic survey of roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles of 2″ fibers to obtain resolved spectroscopy over a wide wavelength range of 3600-10300 . To map the internal variations within each galaxy, we need to perform accurate spectral surface photometry, which is to calibrate the specific intensity at every spatial location sampled by each individual aperture element of the integral field unit. The calibration must correct only for the flux loss due to atmospheric throughput and the instrument response, but not for losses due to the finite geometry of the fiber aperture. This requires the use of standard star measurements to strictly separate these two flux loss factors (throughput versus geometry), a difficult challenge with standard single-fiber spectroscopy techniques due to various practical limitations. Therefore, we developed a technique for spectral surface photometry using multiple small fiber-bundles targeting standard stars simultaneously with galaxy observations. We discuss the principles of our approach and how they compare to previous efforts, and we demonstrate the precision and accuracy achieved. MaNGA's relative calibration between the wavelengths of Hα and Hβ has an rms of 1.7%, while that between [N ii] λ6583 and [O ii] λ3727 has an rms of 4.7%. Using extinction-corrected star formation rates and gas-phase metallicities as an illustration, this level of precision guarantees that flux calibration errors will be sub-dominant when estimating these quantities. The absolute calibration is better than 5% for more than 89% of MaNGA's wavelength range.

    Original languageEnglish (US)
    Article number8
    JournalAstronomical Journal
    Volume151
    Issue number1
    DOIs
    StatePublished - Jan 1 2016

    Fingerprint

    galaxies
    calibration
    fibers
    wavelength
    bundles
    photometry
    apertures
    spectroscopy
    wavelengths
    geometry
    stars
    star formation rate
    field survey
    targeting
    metallicity
    observatories
    extinction
    estimating
    observatory
    vapor phases

    Keywords

    • atmospheric effects
    • methods: observational
    • surveys
    • techniques: imaging spectroscopy

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Yan, R., Tremonti, C., Bershady, M. A., Law, D. R., Schlegel, D. J., Bundy, K., ... Zhang, K. (2016). SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE. Astronomical Journal, 151(1), [8]. https://doi.org/10.3847/0004-6256/151/1/8

    SDSS-IV/MaNGA : SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE. / Yan, Renbin; Tremonti, Christy; Bershady, Matthew A.; Law, David R.; Schlegel, David J.; Bundy, Kevin; Drory, Niv; MacDonald, Nicholas; Bizyaev, Dmitry; Blanc, Guillermo A.; Blanton, Michael R.; Cherinka, Brian; Eigenbrot, Arthur; Gunn, James E.; Harding, Paul; Hogg, David W.; Sánchez-Gallego, José R.; Sánchez, Sebastian F.; Wake, David A.; Weijmans, Anne Marie; Xiao, Ting; Zhang, Kai.

    In: Astronomical Journal, Vol. 151, No. 1, 8, 01.01.2016.

    Research output: Contribution to journalArticle

    Yan, R, Tremonti, C, Bershady, MA, Law, DR, Schlegel, DJ, Bundy, K, Drory, N, MacDonald, N, Bizyaev, D, Blanc, GA, Blanton, MR, Cherinka, B, Eigenbrot, A, Gunn, JE, Harding, P, Hogg, DW, Sánchez-Gallego, JR, Sánchez, SF, Wake, DA, Weijmans, AM, Xiao, T & Zhang, K 2016, 'SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE', Astronomical Journal, vol. 151, no. 1, 8. https://doi.org/10.3847/0004-6256/151/1/8
    Yan R, Tremonti C, Bershady MA, Law DR, Schlegel DJ, Bundy K et al. SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE. Astronomical Journal. 2016 Jan 1;151(1). 8. https://doi.org/10.3847/0004-6256/151/1/8
    Yan, Renbin ; Tremonti, Christy ; Bershady, Matthew A. ; Law, David R. ; Schlegel, David J. ; Bundy, Kevin ; Drory, Niv ; MacDonald, Nicholas ; Bizyaev, Dmitry ; Blanc, Guillermo A. ; Blanton, Michael R. ; Cherinka, Brian ; Eigenbrot, Arthur ; Gunn, James E. ; Harding, Paul ; Hogg, David W. ; Sánchez-Gallego, José R. ; Sánchez, Sebastian F. ; Wake, David A. ; Weijmans, Anne Marie ; Xiao, Ting ; Zhang, Kai. / SDSS-IV/MaNGA : SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE. In: Astronomical Journal. 2016 ; Vol. 151, No. 1.
    @article{19334458b6d7455489cba7b0110ba86e,
    title = "SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE",
    abstract = "Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV, is an integral-field spectroscopic survey of roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles of 2″ fibers to obtain resolved spectroscopy over a wide wavelength range of 3600-10300 . To map the internal variations within each galaxy, we need to perform accurate spectral surface photometry, which is to calibrate the specific intensity at every spatial location sampled by each individual aperture element of the integral field unit. The calibration must correct only for the flux loss due to atmospheric throughput and the instrument response, but not for losses due to the finite geometry of the fiber aperture. This requires the use of standard star measurements to strictly separate these two flux loss factors (throughput versus geometry), a difficult challenge with standard single-fiber spectroscopy techniques due to various practical limitations. Therefore, we developed a technique for spectral surface photometry using multiple small fiber-bundles targeting standard stars simultaneously with galaxy observations. We discuss the principles of our approach and how they compare to previous efforts, and we demonstrate the precision and accuracy achieved. MaNGA's relative calibration between the wavelengths of Hα and Hβ has an rms of 1.7{\%}, while that between [N ii] λ6583 and [O ii] λ3727 has an rms of 4.7{\%}. Using extinction-corrected star formation rates and gas-phase metallicities as an illustration, this level of precision guarantees that flux calibration errors will be sub-dominant when estimating these quantities. The absolute calibration is better than 5{\%} for more than 89{\%} of MaNGA's wavelength range.",
    keywords = "atmospheric effects, methods: observational, surveys, techniques: imaging spectroscopy",
    author = "Renbin Yan and Christy Tremonti and Bershady, {Matthew A.} and Law, {David R.} and Schlegel, {David J.} and Kevin Bundy and Niv Drory and Nicholas MacDonald and Dmitry Bizyaev and Blanc, {Guillermo A.} and Blanton, {Michael R.} and Brian Cherinka and Arthur Eigenbrot and Gunn, {James E.} and Paul Harding and Hogg, {David W.} and S{\'a}nchez-Gallego, {Jos{\'e} R.} and S{\'a}nchez, {Sebastian F.} and Wake, {David A.} and Weijmans, {Anne Marie} and Ting Xiao and Kai Zhang",
    year = "2016",
    month = "1",
    day = "1",
    doi = "10.3847/0004-6256/151/1/8",
    language = "English (US)",
    volume = "151",
    journal = "Astronomical Journal",
    issn = "0004-6256",
    publisher = "IOP Publishing Ltd.",
    number = "1",

    }

    TY - JOUR

    T1 - SDSS-IV/MaNGA

    T2 - SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE

    AU - Yan, Renbin

    AU - Tremonti, Christy

    AU - Bershady, Matthew A.

    AU - Law, David R.

    AU - Schlegel, David J.

    AU - Bundy, Kevin

    AU - Drory, Niv

    AU - MacDonald, Nicholas

    AU - Bizyaev, Dmitry

    AU - Blanc, Guillermo A.

    AU - Blanton, Michael R.

    AU - Cherinka, Brian

    AU - Eigenbrot, Arthur

    AU - Gunn, James E.

    AU - Harding, Paul

    AU - Hogg, David W.

    AU - Sánchez-Gallego, José R.

    AU - Sánchez, Sebastian F.

    AU - Wake, David A.

    AU - Weijmans, Anne Marie

    AU - Xiao, Ting

    AU - Zhang, Kai

    PY - 2016/1/1

    Y1 - 2016/1/1

    N2 - Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV, is an integral-field spectroscopic survey of roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles of 2″ fibers to obtain resolved spectroscopy over a wide wavelength range of 3600-10300 . To map the internal variations within each galaxy, we need to perform accurate spectral surface photometry, which is to calibrate the specific intensity at every spatial location sampled by each individual aperture element of the integral field unit. The calibration must correct only for the flux loss due to atmospheric throughput and the instrument response, but not for losses due to the finite geometry of the fiber aperture. This requires the use of standard star measurements to strictly separate these two flux loss factors (throughput versus geometry), a difficult challenge with standard single-fiber spectroscopy techniques due to various practical limitations. Therefore, we developed a technique for spectral surface photometry using multiple small fiber-bundles targeting standard stars simultaneously with galaxy observations. We discuss the principles of our approach and how they compare to previous efforts, and we demonstrate the precision and accuracy achieved. MaNGA's relative calibration between the wavelengths of Hα and Hβ has an rms of 1.7%, while that between [N ii] λ6583 and [O ii] λ3727 has an rms of 4.7%. Using extinction-corrected star formation rates and gas-phase metallicities as an illustration, this level of precision guarantees that flux calibration errors will be sub-dominant when estimating these quantities. The absolute calibration is better than 5% for more than 89% of MaNGA's wavelength range.

    AB - Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV, is an integral-field spectroscopic survey of roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles of 2″ fibers to obtain resolved spectroscopy over a wide wavelength range of 3600-10300 . To map the internal variations within each galaxy, we need to perform accurate spectral surface photometry, which is to calibrate the specific intensity at every spatial location sampled by each individual aperture element of the integral field unit. The calibration must correct only for the flux loss due to atmospheric throughput and the instrument response, but not for losses due to the finite geometry of the fiber aperture. This requires the use of standard star measurements to strictly separate these two flux loss factors (throughput versus geometry), a difficult challenge with standard single-fiber spectroscopy techniques due to various practical limitations. Therefore, we developed a technique for spectral surface photometry using multiple small fiber-bundles targeting standard stars simultaneously with galaxy observations. We discuss the principles of our approach and how they compare to previous efforts, and we demonstrate the precision and accuracy achieved. MaNGA's relative calibration between the wavelengths of Hα and Hβ has an rms of 1.7%, while that between [N ii] λ6583 and [O ii] λ3727 has an rms of 4.7%. Using extinction-corrected star formation rates and gas-phase metallicities as an illustration, this level of precision guarantees that flux calibration errors will be sub-dominant when estimating these quantities. The absolute calibration is better than 5% for more than 89% of MaNGA's wavelength range.

    KW - atmospheric effects

    KW - methods: observational

    KW - surveys

    KW - techniques: imaging spectroscopy

    UR - http://www.scopus.com/inward/record.url?scp=84955269843&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84955269843&partnerID=8YFLogxK

    U2 - 10.3847/0004-6256/151/1/8

    DO - 10.3847/0004-6256/151/1/8

    M3 - Article

    VL - 151

    JO - Astronomical Journal

    JF - Astronomical Journal

    SN - 0004-6256

    IS - 1

    M1 - 8

    ER -