The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C*

Research output: Contribution to journal › Journal article › Research › peer-review

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The Source of Leaking Ionizing Photons from Haro11 : Clues from HST/COS Spectroscopy of Knots A, B, and C*. / Ostlin, Goran; Rivera-Thorsen, T. Emil; Menacho, Veronica; Hayes, Matthew; Runnholm, Axel; Micheva, Genoveva; Oey, M. S.; Adamo, Angela; Bik, Arjan; Cannon, John M.; Gronke, Max; Kunth, Daniel; Laursen, Peter; Mas-Hesse, J. Miguel; Melinder, Jens; Messa, Matteo; Sirressi, Mattia; Smith, Linda.

In: Astrophysical Journal, Vol. 912, No. 2, 155, 18.05.2021.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Ostlin, G, Rivera-Thorsen, TE, Menacho, V, Hayes, M, Runnholm, A, Micheva, G, Oey, MS, Adamo, A, Bik, A, Cannon, JM, Gronke, M, Kunth, D, Laursen, P, Mas-Hesse, JM, Melinder, J, Messa, M, Sirressi, M & Smith, L 2021, 'The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C*', Astrophysical Journal, vol. 912, no. 2, 155. https://doi.org/10.3847/1538-4357/abf1e8

APA

Ostlin, G., Rivera-Thorsen, T. E., Menacho, V., Hayes, M., Runnholm, A., Micheva, G., Oey, M. S., Adamo, A., Bik, A., Cannon, J. M., Gronke, M., Kunth, D., Laursen, P., Mas-Hesse, J. M., Melinder, J., Messa, M., Sirressi, M., & Smith, L. (2021). The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C*. Astrophysical Journal, 912(2), [155]. https://doi.org/10.3847/1538-4357/abf1e8

Vancouver

Ostlin G, Rivera-Thorsen TE, Menacho V, Hayes M, Runnholm A, Micheva G et al. The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C*. Astrophysical Journal. 2021 May 18;912(2). 155. https://doi.org/10.3847/1538-4357/abf1e8

Author

Ostlin, Goran ; Rivera-Thorsen, T. Emil ; Menacho, Veronica ; Hayes, Matthew ; Runnholm, Axel ; Micheva, Genoveva ; Oey, M. S. ; Adamo, Angela ; Bik, Arjan ; Cannon, John M. ; Gronke, Max ; Kunth, Daniel ; Laursen, Peter ; Mas-Hesse, J. Miguel ; Melinder, Jens ; Messa, Matteo ; Sirressi, Mattia ; Smith, Linda. / The Source of Leaking Ionizing Photons from Haro11 : Clues from HST/COS Spectroscopy of Knots A, B, and C*. In: Astrophysical Journal. 2021 ; Vol. 912, No. 2.

Bibtex

@article{28a62f9effed475eba0f8cf80bcf3fe4,
title = "The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C*",
abstract = "Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how galaxies contributed to reionization in the early universe. While directly detecting the Lyman continuum from high-redshift galaxies is impossible due to the intergalactic medium, low-redshift galaxies in principle offer this possibility but require observations from space. The first local galaxy for which Lyman continuum escape was found is Haro 11, a luminous blue compact galaxy at z = 0.02, where observations with the FUSE satellite revealed an escape fraction of 3.3%. However, the FUSE aperture covers the entire galaxy, and it is not clear from where the Lyman continuum is leaking out. Here we utilize Hubble Space Telescope/Cosmic Origins Spectrograph spectroscopy in the wavelength range 1100-1700 angstrom of the three knots (A, B, and C) of Haro 11 to study the presence of Ly alpha emission and the properties of intervening gas. We find that all knots have bright Ly alpha emission. UV absorption lines, originating in the neutral interstellar medium, as well as lines probing the ionized medium, are seen extending to blueshifted velocities of 500 km s(-1) in all three knots, demonstrating the presence of an outflowing multiphase medium. We find that knots A and B have large covering fractions of neutral gas, making LyC escape along these sightlines improbable, while knot C has a much lower covering fraction (less than or similar to 50%). Knot C also has the the highest Ly alpha escape fraction, and we conclude that it is the most likely source of the escaping Lyman continuum detected in Haro 11.",
keywords = "LYMAN CONTINUUM ESCAPE, HUBBLE-SPACE-TELESCOPE, LOCAL STARBURST GALAXIES, BLUE COMPACT GALAXIES, STAR-FORMING GALAXIES, LY-ALPHA ESCAPE, H-II REGIONS, GALACTIC OUTFLOWS, YOUNG STARBURST, OPTICAL DEPTH",
author = "Goran Ostlin and Rivera-Thorsen, {T. Emil} and Veronica Menacho and Matthew Hayes and Axel Runnholm and Genoveva Micheva and Oey, {M. S.} and Angela Adamo and Arjan Bik and Cannon, {John M.} and Max Gronke and Daniel Kunth and Peter Laursen and Mas-Hesse, {J. Miguel} and Jens Melinder and Matteo Messa and Mattia Sirressi and Linda Smith",
year = "2021",
month = may,
day = "18",
doi = "10.3847/1538-4357/abf1e8",
language = "English",
volume = "912",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing, Inc",
number = "2",

}

RIS

TY - JOUR

T1 - The Source of Leaking Ionizing Photons from Haro11

T2 - Clues from HST/COS Spectroscopy of Knots A, B, and C*

AU - Ostlin, Goran

AU - Rivera-Thorsen, T. Emil

AU - Menacho, Veronica

AU - Hayes, Matthew

AU - Runnholm, Axel

AU - Micheva, Genoveva

AU - Oey, M. S.

AU - Adamo, Angela

AU - Bik, Arjan

AU - Cannon, John M.

AU - Gronke, Max

AU - Kunth, Daniel

AU - Laursen, Peter

AU - Mas-Hesse, J. Miguel

AU - Melinder, Jens

AU - Messa, Matteo

AU - Sirressi, Mattia

AU - Smith, Linda

PY - 2021/5/18

Y1 - 2021/5/18

N2 - Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how galaxies contributed to reionization in the early universe. While directly detecting the Lyman continuum from high-redshift galaxies is impossible due to the intergalactic medium, low-redshift galaxies in principle offer this possibility but require observations from space. The first local galaxy for which Lyman continuum escape was found is Haro 11, a luminous blue compact galaxy at z = 0.02, where observations with the FUSE satellite revealed an escape fraction of 3.3%. However, the FUSE aperture covers the entire galaxy, and it is not clear from where the Lyman continuum is leaking out. Here we utilize Hubble Space Telescope/Cosmic Origins Spectrograph spectroscopy in the wavelength range 1100-1700 angstrom of the three knots (A, B, and C) of Haro 11 to study the presence of Ly alpha emission and the properties of intervening gas. We find that all knots have bright Ly alpha emission. UV absorption lines, originating in the neutral interstellar medium, as well as lines probing the ionized medium, are seen extending to blueshifted velocities of 500 km s(-1) in all three knots, demonstrating the presence of an outflowing multiphase medium. We find that knots A and B have large covering fractions of neutral gas, making LyC escape along these sightlines improbable, while knot C has a much lower covering fraction (less than or similar to 50%). Knot C also has the the highest Ly alpha escape fraction, and we conclude that it is the most likely source of the escaping Lyman continuum detected in Haro 11.

AB - Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how galaxies contributed to reionization in the early universe. While directly detecting the Lyman continuum from high-redshift galaxies is impossible due to the intergalactic medium, low-redshift galaxies in principle offer this possibility but require observations from space. The first local galaxy for which Lyman continuum escape was found is Haro 11, a luminous blue compact galaxy at z = 0.02, where observations with the FUSE satellite revealed an escape fraction of 3.3%. However, the FUSE aperture covers the entire galaxy, and it is not clear from where the Lyman continuum is leaking out. Here we utilize Hubble Space Telescope/Cosmic Origins Spectrograph spectroscopy in the wavelength range 1100-1700 angstrom of the three knots (A, B, and C) of Haro 11 to study the presence of Ly alpha emission and the properties of intervening gas. We find that all knots have bright Ly alpha emission. UV absorption lines, originating in the neutral interstellar medium, as well as lines probing the ionized medium, are seen extending to blueshifted velocities of 500 km s(-1) in all three knots, demonstrating the presence of an outflowing multiphase medium. We find that knots A and B have large covering fractions of neutral gas, making LyC escape along these sightlines improbable, while knot C has a much lower covering fraction (less than or similar to 50%). Knot C also has the the highest Ly alpha escape fraction, and we conclude that it is the most likely source of the escaping Lyman continuum detected in Haro 11.

KW - LYMAN CONTINUUM ESCAPE

KW - HUBBLE-SPACE-TELESCOPE

KW - LOCAL STARBURST GALAXIES

KW - BLUE COMPACT GALAXIES

KW - STAR-FORMING GALAXIES

KW - LY-ALPHA ESCAPE

KW - H-II REGIONS

KW - GALACTIC OUTFLOWS

KW - YOUNG STARBURST

KW - OPTICAL DEPTH

U2 - 10.3847/1538-4357/abf1e8

DO - 10.3847/1538-4357/abf1e8

M3 - Journal article

VL - 912

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 155

ER -

ID: 270621292