Mapping electron temperature variations across a spiral arm in ngc 1672

I. Ting Ho, Kathryn Kreckel, Sharon E. Meidt, Brent Groves, Guillermo A. Blanc, Frank Bigiel, Daniel A. Dale, Eric Emsellem, Simon C.O. Glover, Kathryn Grasha, Lisa J. Kewley, J. M.Diederik Kruijssen, Philipp Lang, Rebecca McElroy, Rolf Peter Kudritzki, Patricia Sanchez-Blazquez, Karin Sandstrom, Francesco Santoro, Eva Schinnerer, Andreas Schruba

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report one of the first extragalactic observations of electron temperature variations across a spiral arm. Using Multi Unit Spectroscopic Explorer mosaic observations of the nearby galaxy NGC 1672, we measure the [N ii]λ5755 auroral line in a sample of 80 H ii regions in the eastern spiral arm of NGC 1672. We discover systematic temperature variations as a function of distance perpendicular to the spiral arm. The electron temperature is lowest on the spiral arm itself and highest on the downstream side. Photoionization models of different metallicity, pressure, and age of the ionizing source are explored to understand what properties of the interstellar medium drive the observed temperature variations. An azimuthally varying metallicity appears to be the most likely cause of the temperature variations. The electron temperature measurements solidify recent discoveries of azimuthal variations of oxygen abundance based on strong lines, and rule out the possibility that the abundance variations are artifacts of the strong-line calibrations.

Original languageEnglish
Article numberL31
JournalAstrophysical Journal Letters
Volume885
Issue number2
DOIs
Publication statusPublished - 10 Nov 2019

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electron energy
electron
temperature
metallicity
artifact
temperature measurement
artifacts
photoionization
calibration
oxygen
galaxies
causes

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Ho, I. T., Kreckel, K., Meidt, S. E., Groves, B., Blanc, G. A., Bigiel, F., ... Schruba, A. (2019). Mapping electron temperature variations across a spiral arm in ngc 1672. Astrophysical Journal Letters, 885(2), [L31]. https://doi.org/10.3847/2041-8213/ab4feb
Ho, I. Ting ; Kreckel, Kathryn ; Meidt, Sharon E. ; Groves, Brent ; Blanc, Guillermo A. ; Bigiel, Frank ; Dale, Daniel A. ; Emsellem, Eric ; Glover, Simon C.O. ; Grasha, Kathryn ; Kewley, Lisa J. ; Kruijssen, J. M.Diederik ; Lang, Philipp ; McElroy, Rebecca ; Kudritzki, Rolf Peter ; Sanchez-Blazquez, Patricia ; Sandstrom, Karin ; Santoro, Francesco ; Schinnerer, Eva ; Schruba, Andreas. / Mapping electron temperature variations across a spiral arm in ngc 1672. In: Astrophysical Journal Letters. 2019 ; Vol. 885, No. 2.
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abstract = "We report one of the first extragalactic observations of electron temperature variations across a spiral arm. Using Multi Unit Spectroscopic Explorer mosaic observations of the nearby galaxy NGC 1672, we measure the [N ii]λ5755 auroral line in a sample of 80 H ii regions in the eastern spiral arm of NGC 1672. We discover systematic temperature variations as a function of distance perpendicular to the spiral arm. The electron temperature is lowest on the spiral arm itself and highest on the downstream side. Photoionization models of different metallicity, pressure, and age of the ionizing source are explored to understand what properties of the interstellar medium drive the observed temperature variations. An azimuthally varying metallicity appears to be the most likely cause of the temperature variations. The electron temperature measurements solidify recent discoveries of azimuthal variations of oxygen abundance based on strong lines, and rule out the possibility that the abundance variations are artifacts of the strong-line calibrations.",
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Ho, IT, Kreckel, K, Meidt, SE, Groves, B, Blanc, GA, Bigiel, F, Dale, DA, Emsellem, E, Glover, SCO, Grasha, K, Kewley, LJ, Kruijssen, JMD, Lang, P, McElroy, R, Kudritzki, RP, Sanchez-Blazquez, P, Sandstrom, K, Santoro, F, Schinnerer, E & Schruba, A 2019, 'Mapping electron temperature variations across a spiral arm in ngc 1672' Astrophysical Journal Letters, vol. 885, no. 2, L31. https://doi.org/10.3847/2041-8213/ab4feb

Mapping electron temperature variations across a spiral arm in ngc 1672. / Ho, I. Ting; Kreckel, Kathryn; Meidt, Sharon E.; Groves, Brent; Blanc, Guillermo A.; Bigiel, Frank; Dale, Daniel A.; Emsellem, Eric; Glover, Simon C.O.; Grasha, Kathryn; Kewley, Lisa J.; Kruijssen, J. M.Diederik; Lang, Philipp; McElroy, Rebecca; Kudritzki, Rolf Peter; Sanchez-Blazquez, Patricia; Sandstrom, Karin; Santoro, Francesco; Schinnerer, Eva; Schruba, Andreas.

In: Astrophysical Journal Letters, Vol. 885, No. 2, L31, 10.11.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mapping electron temperature variations across a spiral arm in ngc 1672

AU - Ho, I. Ting

AU - Kreckel, Kathryn

AU - Meidt, Sharon E.

AU - Groves, Brent

AU - Blanc, Guillermo A.

AU - Bigiel, Frank

AU - Dale, Daniel A.

AU - Emsellem, Eric

AU - Glover, Simon C.O.

AU - Grasha, Kathryn

AU - Kewley, Lisa J.

AU - Kruijssen, J. M.Diederik

AU - Lang, Philipp

AU - McElroy, Rebecca

AU - Kudritzki, Rolf Peter

AU - Sanchez-Blazquez, Patricia

AU - Sandstrom, Karin

AU - Santoro, Francesco

AU - Schinnerer, Eva

AU - Schruba, Andreas

PY - 2019/11/10

Y1 - 2019/11/10

N2 - We report one of the first extragalactic observations of electron temperature variations across a spiral arm. Using Multi Unit Spectroscopic Explorer mosaic observations of the nearby galaxy NGC 1672, we measure the [N ii]λ5755 auroral line in a sample of 80 H ii regions in the eastern spiral arm of NGC 1672. We discover systematic temperature variations as a function of distance perpendicular to the spiral arm. The electron temperature is lowest on the spiral arm itself and highest on the downstream side. Photoionization models of different metallicity, pressure, and age of the ionizing source are explored to understand what properties of the interstellar medium drive the observed temperature variations. An azimuthally varying metallicity appears to be the most likely cause of the temperature variations. The electron temperature measurements solidify recent discoveries of azimuthal variations of oxygen abundance based on strong lines, and rule out the possibility that the abundance variations are artifacts of the strong-line calibrations.

AB - We report one of the first extragalactic observations of electron temperature variations across a spiral arm. Using Multi Unit Spectroscopic Explorer mosaic observations of the nearby galaxy NGC 1672, we measure the [N ii]λ5755 auroral line in a sample of 80 H ii regions in the eastern spiral arm of NGC 1672. We discover systematic temperature variations as a function of distance perpendicular to the spiral arm. The electron temperature is lowest on the spiral arm itself and highest on the downstream side. Photoionization models of different metallicity, pressure, and age of the ionizing source are explored to understand what properties of the interstellar medium drive the observed temperature variations. An azimuthally varying metallicity appears to be the most likely cause of the temperature variations. The electron temperature measurements solidify recent discoveries of azimuthal variations of oxygen abundance based on strong lines, and rule out the possibility that the abundance variations are artifacts of the strong-line calibrations.

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U2 - 10.3847/2041-8213/ab4feb

DO - 10.3847/2041-8213/ab4feb

M3 - Article

VL - 885

JO - The Astrophysical Journal Letters

JF - The Astrophysical Journal Letters

SN - 2041-8205

IS - 2

M1 - L31

ER -