Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427

Joan Font, John E. Beckman, Margarita Rosado, Benot Epinat, Kambiz Fathi, Olivier Hernandez, Claude Carignan, Leonel Gutiérrez, Monica Relão, Javier Blasco-Herrera, Isaura Fuentes-Carrera

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Abstract

Using velocity tagging we have detected hydrogen from NGC 5426 falling onto its interacting partner NGC 5427. Our observations, with the GHaFaS Fabry-Perot spectrometer, produced maps of the two galaxies in Hα surface brightness and radial velocity. We found emission with the range of velocities associated with NGC 5426 along lines of sight apparently emanating from NGC 5427, superposed on the velocity map of the latter. After excluding instrumental effects we assign the anomalous emission to gas pulled from NGC 5426 during its passage close to NGC 5427. Its distribution, more intense between the arms and just outside the disk of NGC 5427, and weak, or absent, in the arms, suggests that the infalling gas is behind the disk, ionized by Lyman continuum photons escaping from NGC 5427. Modeling this, we estimate the distances of these gas clouds behind the plane: a few hundred parsecs to a few kiloparsecs. We also estimate the mass of the infalling (ionized plus neutral) gas, finding an infall rate of 10 M ∞ per year, consistent with the high measured star formation rate across the disk of NGC 5427 and with the detected circumnuclear galactic wind. © 2011. The American Astronomical Society. All rights reserved.
Original languageAmerican English
JournalAstrophysical Journal Letters
DOIs
StatePublished - 10 Oct 2011

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interacting galaxies
hydrogen
gas
gases
Fabry-Perot spectrometers
galactic winds
neutral gases
tagging
estimates
star formation rate
falling
radial velocity
line of sight
marking
brightness
spectrometer
galaxies
continuums
detection
photons

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Font, Joan ; Beckman, John E. ; Rosado, Margarita ; Epinat, Benot ; Fathi, Kambiz ; Hernandez, Olivier ; Carignan, Claude ; Gutiérrez, Leonel ; Relão, Monica ; Blasco-Herrera, Javier ; Fuentes-Carrera, Isaura. / Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427. In: Astrophysical Journal Letters. 2011.
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abstract = "Using velocity tagging we have detected hydrogen from NGC 5426 falling onto its interacting partner NGC 5427. Our observations, with the GHaFaS Fabry-Perot spectrometer, produced maps of the two galaxies in Hα surface brightness and radial velocity. We found emission with the range of velocities associated with NGC 5426 along lines of sight apparently emanating from NGC 5427, superposed on the velocity map of the latter. After excluding instrumental effects we assign the anomalous emission to gas pulled from NGC 5426 during its passage close to NGC 5427. Its distribution, more intense between the arms and just outside the disk of NGC 5427, and weak, or absent, in the arms, suggests that the infalling gas is behind the disk, ionized by Lyman continuum photons escaping from NGC 5427. Modeling this, we estimate the distances of these gas clouds behind the plane: a few hundred parsecs to a few kiloparsecs. We also estimate the mass of the infalling (ionized plus neutral) gas, finding an infall rate of 10 M ∞ per year, consistent with the high measured star formation rate across the disk of NGC 5427 and with the detected circumnuclear galactic wind. {\circledC} 2011. The American Astronomical Society. All rights reserved.",
author = "Joan Font and Beckman, {John E.} and Margarita Rosado and Benot Epinat and Kambiz Fathi and Olivier Hernandez and Claude Carignan and Leonel Guti{\'e}rrez and Monica Rel{\~a}o and Javier Blasco-Herrera and Isaura Fuentes-Carrera",
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Font, J, Beckman, JE, Rosado, M, Epinat, B, Fathi, K, Hernandez, O, Carignan, C, Gutiérrez, L, Relão, M, Blasco-Herrera, J & Fuentes-Carrera, I 2011, 'Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427', Astrophysical Journal Letters. https://doi.org/10.1088/2041-8205/740/1/L1

Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427. / Font, Joan; Beckman, John E.; Rosado, Margarita; Epinat, Benot; Fathi, Kambiz; Hernandez, Olivier; Carignan, Claude; Gutiérrez, Leonel; Relão, Monica; Blasco-Herrera, Javier; Fuentes-Carrera, Isaura.

In: Astrophysical Journal Letters, 10.10.2011.

Research output: Contribution to journalArticle

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T1 - Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427

AU - Font, Joan

AU - Beckman, John E.

AU - Rosado, Margarita

AU - Epinat, Benot

AU - Fathi, Kambiz

AU - Hernandez, Olivier

AU - Carignan, Claude

AU - Gutiérrez, Leonel

AU - Relão, Monica

AU - Blasco-Herrera, Javier

AU - Fuentes-Carrera, Isaura

PY - 2011/10/10

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N2 - Using velocity tagging we have detected hydrogen from NGC 5426 falling onto its interacting partner NGC 5427. Our observations, with the GHaFaS Fabry-Perot spectrometer, produced maps of the two galaxies in Hα surface brightness and radial velocity. We found emission with the range of velocities associated with NGC 5426 along lines of sight apparently emanating from NGC 5427, superposed on the velocity map of the latter. After excluding instrumental effects we assign the anomalous emission to gas pulled from NGC 5426 during its passage close to NGC 5427. Its distribution, more intense between the arms and just outside the disk of NGC 5427, and weak, or absent, in the arms, suggests that the infalling gas is behind the disk, ionized by Lyman continuum photons escaping from NGC 5427. Modeling this, we estimate the distances of these gas clouds behind the plane: a few hundred parsecs to a few kiloparsecs. We also estimate the mass of the infalling (ionized plus neutral) gas, finding an infall rate of 10 M ∞ per year, consistent with the high measured star formation rate across the disk of NGC 5427 and with the detected circumnuclear galactic wind. © 2011. The American Astronomical Society. All rights reserved.

AB - Using velocity tagging we have detected hydrogen from NGC 5426 falling onto its interacting partner NGC 5427. Our observations, with the GHaFaS Fabry-Perot spectrometer, produced maps of the two galaxies in Hα surface brightness and radial velocity. We found emission with the range of velocities associated with NGC 5426 along lines of sight apparently emanating from NGC 5427, superposed on the velocity map of the latter. After excluding instrumental effects we assign the anomalous emission to gas pulled from NGC 5426 during its passage close to NGC 5427. Its distribution, more intense between the arms and just outside the disk of NGC 5427, and weak, or absent, in the arms, suggests that the infalling gas is behind the disk, ionized by Lyman continuum photons escaping from NGC 5427. Modeling this, we estimate the distances of these gas clouds behind the plane: a few hundred parsecs to a few kiloparsecs. We also estimate the mass of the infalling (ionized plus neutral) gas, finding an infall rate of 10 M ∞ per year, consistent with the high measured star formation rate across the disk of NGC 5427 and with the detected circumnuclear galactic wind. © 2011. The American Astronomical Society. All rights reserved.

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