AGC198606: A gas-bearing dark matter minihalo?

E.A.K. Adams, Y. Faerman, W.F. Janesh, Steven Janowiecki, T.A. Oosterloo, K.L. Rhode, R. Giovanelli, M.P. Haynes, J.J. Salzer, A. Sternberg, J.M. Cannon, R.R. Muñoz

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    © ESO, 2014. We present neutral hydrogen (H' i) imaging observations with the Westerbork Synthesis Radio Telescope of AGC198606, an H' i cloud discovered in the ALFALFA 21cm survey. This object is of particular note as it is located 16 km s-1 and 1. 2 from the gas-bearing ultra-faint dwarf galaxy Leo T while having a similar H' i linewidth and approximately twice the flux density. The H' i imaging observations reveal a smooth, undisturbed H' i morphology with a full extent of 23′ × 16′ at the 5 × 1018 atoms' cm-2 level. The velocity field of AGC198606 shows ordered motion with a gradient of ∼25 km s-1 across ∼20′. The global velocity dispersion is 9.3 km s-1 with no evidence for a narrow spectral component. No optical counterpart to AGC198606 is detected. The distance to AGC198606 is unknown, and we consider several different scenarios: physical association with Leo T, a minihalo at a distance of ∼150 kpc based on the models of Faerman et al. (2013, ApJ, 777, 119), and a cloud in the Galactic halo. At a distance of 420 kpc, AGC198606 would have an H' i mass of 6.2 × 105 M⊙, an H' i radius of 1.4 kpc, and a dynamical mass within the H' i extent of 1.5 × 108 M⊙.
    Original languageEnglish
    Pages (from-to)1-4
    JournalAstronomy and Astrophysics
    Volume573
    DOIs
    Publication statusPublished - 2015

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    gas bearings
    dark matter
    gas
    galactic halos
    radio telescopes
    hydrogen
    dwarf galaxies
    radio
    European Southern Observatory
    flux density
    velocity distribution
    gradients
    radii
    synthesis
    atoms

    Cite this

    Adams, E. A. K., Faerman, Y., Janesh, W. F., Janowiecki, S., Oosterloo, T. A., Rhode, K. L., ... Muñoz, R. R. (2015). AGC198606: A gas-bearing dark matter minihalo? Astronomy and Astrophysics, 573, 1-4. https://doi.org/10.1051/0004-6361/201425211
    Adams, E.A.K. ; Faerman, Y. ; Janesh, W.F. ; Janowiecki, Steven ; Oosterloo, T.A. ; Rhode, K.L. ; Giovanelli, R. ; Haynes, M.P. ; Salzer, J.J. ; Sternberg, A. ; Cannon, J.M. ; Muñoz, R.R. / AGC198606: A gas-bearing dark matter minihalo?. In: Astronomy and Astrophysics. 2015 ; Vol. 573. pp. 1-4.
    @article{9a6e60e1fb2c429d8a9438e9e79a0268,
    title = "AGC198606: A gas-bearing dark matter minihalo?",
    abstract = "{\circledC} ESO, 2014. We present neutral hydrogen (H' i) imaging observations with the Westerbork Synthesis Radio Telescope of AGC198606, an H' i cloud discovered in the ALFALFA 21cm survey. This object is of particular note as it is located 16 km s-1 and 1. 2 from the gas-bearing ultra-faint dwarf galaxy Leo T while having a similar H' i linewidth and approximately twice the flux density. The H' i imaging observations reveal a smooth, undisturbed H' i morphology with a full extent of 23′ × 16′ at the 5 × 1018 atoms' cm-2 level. The velocity field of AGC198606 shows ordered motion with a gradient of ∼25 km s-1 across ∼20′. The global velocity dispersion is 9.3 km s-1 with no evidence for a narrow spectral component. No optical counterpart to AGC198606 is detected. The distance to AGC198606 is unknown, and we consider several different scenarios: physical association with Leo T, a minihalo at a distance of ∼150 kpc based on the models of Faerman et al. (2013, ApJ, 777, 119), and a cloud in the Galactic halo. At a distance of 420 kpc, AGC198606 would have an H' i mass of 6.2 × 105 M⊙, an H' i radius of 1.4 kpc, and a dynamical mass within the H' i extent of 1.5 × 108 M⊙.",
    author = "E.A.K. Adams and Y. Faerman and W.F. Janesh and Steven Janowiecki and T.A. Oosterloo and K.L. Rhode and R. Giovanelli and M.P. Haynes and J.J. Salzer and A. Sternberg and J.M. Cannon and R.R. Mu{\~n}oz",
    year = "2015",
    doi = "10.1051/0004-6361/201425211",
    language = "English",
    volume = "573",
    pages = "1--4",
    journal = "ASTRONOMY & ASTROPHYSICS",
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    Adams, EAK, Faerman, Y, Janesh, WF, Janowiecki, S, Oosterloo, TA, Rhode, KL, Giovanelli, R, Haynes, MP, Salzer, JJ, Sternberg, A, Cannon, JM & Muñoz, RR 2015, 'AGC198606: A gas-bearing dark matter minihalo?' Astronomy and Astrophysics, vol. 573, pp. 1-4. https://doi.org/10.1051/0004-6361/201425211

    AGC198606: A gas-bearing dark matter minihalo? / Adams, E.A.K.; Faerman, Y.; Janesh, W.F.; Janowiecki, Steven; Oosterloo, T.A.; Rhode, K.L.; Giovanelli, R.; Haynes, M.P.; Salzer, J.J.; Sternberg, A.; Cannon, J.M.; Muñoz, R.R.

    In: Astronomy and Astrophysics, Vol. 573, 2015, p. 1-4.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - AGC198606: A gas-bearing dark matter minihalo?

    AU - Adams, E.A.K.

    AU - Faerman, Y.

    AU - Janesh, W.F.

    AU - Janowiecki, Steven

    AU - Oosterloo, T.A.

    AU - Rhode, K.L.

    AU - Giovanelli, R.

    AU - Haynes, M.P.

    AU - Salzer, J.J.

    AU - Sternberg, A.

    AU - Cannon, J.M.

    AU - Muñoz, R.R.

    PY - 2015

    Y1 - 2015

    N2 - © ESO, 2014. We present neutral hydrogen (H' i) imaging observations with the Westerbork Synthesis Radio Telescope of AGC198606, an H' i cloud discovered in the ALFALFA 21cm survey. This object is of particular note as it is located 16 km s-1 and 1. 2 from the gas-bearing ultra-faint dwarf galaxy Leo T while having a similar H' i linewidth and approximately twice the flux density. The H' i imaging observations reveal a smooth, undisturbed H' i morphology with a full extent of 23′ × 16′ at the 5 × 1018 atoms' cm-2 level. The velocity field of AGC198606 shows ordered motion with a gradient of ∼25 km s-1 across ∼20′. The global velocity dispersion is 9.3 km s-1 with no evidence for a narrow spectral component. No optical counterpart to AGC198606 is detected. The distance to AGC198606 is unknown, and we consider several different scenarios: physical association with Leo T, a minihalo at a distance of ∼150 kpc based on the models of Faerman et al. (2013, ApJ, 777, 119), and a cloud in the Galactic halo. At a distance of 420 kpc, AGC198606 would have an H' i mass of 6.2 × 105 M⊙, an H' i radius of 1.4 kpc, and a dynamical mass within the H' i extent of 1.5 × 108 M⊙.

    AB - © ESO, 2014. We present neutral hydrogen (H' i) imaging observations with the Westerbork Synthesis Radio Telescope of AGC198606, an H' i cloud discovered in the ALFALFA 21cm survey. This object is of particular note as it is located 16 km s-1 and 1. 2 from the gas-bearing ultra-faint dwarf galaxy Leo T while having a similar H' i linewidth and approximately twice the flux density. The H' i imaging observations reveal a smooth, undisturbed H' i morphology with a full extent of 23′ × 16′ at the 5 × 1018 atoms' cm-2 level. The velocity field of AGC198606 shows ordered motion with a gradient of ∼25 km s-1 across ∼20′. The global velocity dispersion is 9.3 km s-1 with no evidence for a narrow spectral component. No optical counterpart to AGC198606 is detected. The distance to AGC198606 is unknown, and we consider several different scenarios: physical association with Leo T, a minihalo at a distance of ∼150 kpc based on the models of Faerman et al. (2013, ApJ, 777, 119), and a cloud in the Galactic halo. At a distance of 420 kpc, AGC198606 would have an H' i mass of 6.2 × 105 M⊙, an H' i radius of 1.4 kpc, and a dynamical mass within the H' i extent of 1.5 × 108 M⊙.

    U2 - 10.1051/0004-6361/201425211

    DO - 10.1051/0004-6361/201425211

    M3 - Article

    VL - 573

    SP - 1

    EP - 4

    JO - ASTRONOMY & ASTROPHYSICS

    JF - ASTRONOMY & ASTROPHYSICS

    SN - 0004-6361

    ER -

    Adams EAK, Faerman Y, Janesh WF, Janowiecki S, Oosterloo TA, Rhode KL et al. AGC198606: A gas-bearing dark matter minihalo? Astronomy and Astrophysics. 2015;573:1-4. https://doi.org/10.1051/0004-6361/201425211