GASS 3505: The prototype of HI-excess, passive galaxies

K. Geréb, Barbara Catinella, Luca Cortese, Kenji Bekki, S.M. Moran, D. Schiminovich

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    © 2016 The Authors.We present our multiwavelength analysis of a prototype HI-excess galaxy, GASS 3505, selected based on having a large gas content (MHI = 109.9 M?) compared to its little associated star formation activity (~0.1 M? yr-1) in the GALEX Arecibo SDSS Survey (GASS). Very Large Array observations show that the HI in GASS 3505 is distributed in a regularly rotating, extended (~50 kpc radius) gas ring. In the SDSS optical image GASS 3505 appears as a bulge-dominated galaxy, however deep optical imaging reveals low surface brightness (?25 mag arcsec-2) stellar emission around the central bulge. Direct evidence for accretion is detected in form of an extended (~60 kpc) stellar stream, showing that GASS 3505 has experienced a minor merger in the recent past. We investigate the possibility that the HI ring in GASS 3505 was accreted in such a merger event using N-body and smoothed particle hydrodynamic simulations. The best model that reproduces the general properties (i.e. gas distribution and kinematics, stellar morphology) of the galaxy involves a merger between the central bulge and a gas-rich (M* = 109 M? and MHI/M* = 10) disc galaxy. However, small discrepancies in the observed and modelled properties could suggest that other sources of gas have to be involved in the build-up of the gas reservoir. This work is the first step towards a larger program to investigate the physical mechanisms that drive the large scatter in the gas scaling relations of nearby galaxies.
    Original languageEnglish
    Pages (from-to)382-394
    JournalMonthly Notices of the Royal Astronomical Society
    Volume462
    Issue number1
    DOIs
    Publication statusPublished - 11 Oct 2016

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    prototypes
    galaxies
    gases
    gas
    merger
    galactic bulge
    general property
    Very Large Array (VLA)
    rings
    disk galaxies
    kinematics
    hydrodynamics
    star formation
    accretion
    brightness
    scaling
    radii
    simulation

    Cite this

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    title = "GASS 3505: The prototype of HI-excess, passive galaxies",
    abstract = "{\circledC} 2016 The Authors.We present our multiwavelength analysis of a prototype HI-excess galaxy, GASS 3505, selected based on having a large gas content (MHI = 109.9 M?) compared to its little associated star formation activity (~0.1 M? yr-1) in the GALEX Arecibo SDSS Survey (GASS). Very Large Array observations show that the HI in GASS 3505 is distributed in a regularly rotating, extended (~50 kpc radius) gas ring. In the SDSS optical image GASS 3505 appears as a bulge-dominated galaxy, however deep optical imaging reveals low surface brightness (?25 mag arcsec-2) stellar emission around the central bulge. Direct evidence for accretion is detected in form of an extended (~60 kpc) stellar stream, showing that GASS 3505 has experienced a minor merger in the recent past. We investigate the possibility that the HI ring in GASS 3505 was accreted in such a merger event using N-body and smoothed particle hydrodynamic simulations. The best model that reproduces the general properties (i.e. gas distribution and kinematics, stellar morphology) of the galaxy involves a merger between the central bulge and a gas-rich (M* = 109 M? and MHI/M* = 10) disc galaxy. However, small discrepancies in the observed and modelled properties could suggest that other sources of gas have to be involved in the build-up of the gas reservoir. This work is the first step towards a larger program to investigate the physical mechanisms that drive the large scatter in the gas scaling relations of nearby galaxies.",
    author = "K. Ger{\'e}b and Barbara Catinella and Luca Cortese and Kenji Bekki and S.M. Moran and D. Schiminovich",
    year = "2016",
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    language = "English",
    volume = "462",
    pages = "382--394",
    journal = "Monthly Notices of the Royal Astronomical Society",
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    GASS 3505 : The prototype of HI-excess, passive galaxies. / Geréb, K.; Catinella, Barbara; Cortese, Luca; Bekki, Kenji; Moran, S.M.; Schiminovich, D.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 462, No. 1, 11.10.2016, p. 382-394.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - GASS 3505

    T2 - The prototype of HI-excess, passive galaxies

    AU - Geréb, K.

    AU - Catinella, Barbara

    AU - Cortese, Luca

    AU - Bekki, Kenji

    AU - Moran, S.M.

    AU - Schiminovich, D.

    PY - 2016/10/11

    Y1 - 2016/10/11

    N2 - © 2016 The Authors.We present our multiwavelength analysis of a prototype HI-excess galaxy, GASS 3505, selected based on having a large gas content (MHI = 109.9 M?) compared to its little associated star formation activity (~0.1 M? yr-1) in the GALEX Arecibo SDSS Survey (GASS). Very Large Array observations show that the HI in GASS 3505 is distributed in a regularly rotating, extended (~50 kpc radius) gas ring. In the SDSS optical image GASS 3505 appears as a bulge-dominated galaxy, however deep optical imaging reveals low surface brightness (?25 mag arcsec-2) stellar emission around the central bulge. Direct evidence for accretion is detected in form of an extended (~60 kpc) stellar stream, showing that GASS 3505 has experienced a minor merger in the recent past. We investigate the possibility that the HI ring in GASS 3505 was accreted in such a merger event using N-body and smoothed particle hydrodynamic simulations. The best model that reproduces the general properties (i.e. gas distribution and kinematics, stellar morphology) of the galaxy involves a merger between the central bulge and a gas-rich (M* = 109 M? and MHI/M* = 10) disc galaxy. However, small discrepancies in the observed and modelled properties could suggest that other sources of gas have to be involved in the build-up of the gas reservoir. This work is the first step towards a larger program to investigate the physical mechanisms that drive the large scatter in the gas scaling relations of nearby galaxies.

    AB - © 2016 The Authors.We present our multiwavelength analysis of a prototype HI-excess galaxy, GASS 3505, selected based on having a large gas content (MHI = 109.9 M?) compared to its little associated star formation activity (~0.1 M? yr-1) in the GALEX Arecibo SDSS Survey (GASS). Very Large Array observations show that the HI in GASS 3505 is distributed in a regularly rotating, extended (~50 kpc radius) gas ring. In the SDSS optical image GASS 3505 appears as a bulge-dominated galaxy, however deep optical imaging reveals low surface brightness (?25 mag arcsec-2) stellar emission around the central bulge. Direct evidence for accretion is detected in form of an extended (~60 kpc) stellar stream, showing that GASS 3505 has experienced a minor merger in the recent past. We investigate the possibility that the HI ring in GASS 3505 was accreted in such a merger event using N-body and smoothed particle hydrodynamic simulations. The best model that reproduces the general properties (i.e. gas distribution and kinematics, stellar morphology) of the galaxy involves a merger between the central bulge and a gas-rich (M* = 109 M? and MHI/M* = 10) disc galaxy. However, small discrepancies in the observed and modelled properties could suggest that other sources of gas have to be involved in the build-up of the gas reservoir. This work is the first step towards a larger program to investigate the physical mechanisms that drive the large scatter in the gas scaling relations of nearby galaxies.

    U2 - 10.1093/mnras/stw1675

    DO - 10.1093/mnras/stw1675

    M3 - Article

    VL - 462

    SP - 382

    EP - 394

    JO - Monthly Notices of the Royal Astronomical Society

    JF - Monthly Notices of the Royal Astronomical Society

    SN - 0035-8711

    IS - 1

    ER -