Extended [C II] Emission in Local Luminous Infrared Galaxies

T. Díaz-Santos; L. Armus; V. Charmandaris; G. Stacey; E. J. Murphy; S. Haan; S. Stierwalt; S. Malhotra; P. Appleton; H. Inami; G. E. Magdis; D. Elbaz; A. S. Evans; J. M. Mazzarella; J. A. Surace; P. P. van der Werf; C. K. Xu; N. Lu; R. Meijerink; J. H. Howell; A. O. Petric; S. Veilleux; D. B. Sanders

doi:10.1088/2041-8205/788/1/L17

Extended [C II] Emission in Local Luminous Infrared Galaxies

T. Díaz-Santos, L. Armus, V. Charmandaris, G. Stacey, E. J. Murphy, S. Haan, S. Stierwalt, S. Malhotra, P. Appleton, H. Inami, G. E. Magdis, D. Elbaz, A. S. Evans, J. M. Mazzarella, J. A. Surace, P. P. van der Werf, C. K. Xu, N. Lu, R. Meijerink, J. H. HowellA. O. Petric, S. Veilleux, D. B. Sanders

Astronomy

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Abstract

We present Herschel/PACS observations of extended [C II] 157.7 μm line emission detected on ~1-10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey. We find that most of the extra-nuclear emission show [C II]/FIR ratios >=4 × 10-3, larger than the mean ratio seen in the nuclei, and similar to those found in the extended disks of normal star-forming galaxies and the diffuse interstellar medium of our Galaxy. The [C II] "deficits" found in the most luminous local LIRGs are therefore restricted to their nuclei. There is a trend for LIRGs with warmer nuclei to show larger differences between their nuclear and extra-nuclear [C II]/FIR ratios. We find an anti-correlation between [C II]/FIR and the luminosity surface density, ΣIR, for the extended emission in the spatially resolved galaxies. However, there is an offset between this trend and that found for the LIRG nuclei. We use this offset to derive a beam filling-factor for the star-forming regions within the LIRG disks of ~6% relative to their nuclei. We confront the observed trend to photo-dissociation region models and find that the slope of the correlation is much shallower than the model predictions. Finally, we compare the correlation found between [C II]/FIR and ΣIR with measurements of high-redshift starbursting IR-luminous galaxies.

Original language	English
Article number	L17
Number of pages	5
Journal	The Astrophysical Journal
Volume	788
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/788/1/L17
Publication status	Published - Jun-2014

Keywords

galaxies: ISM
galaxies: nuclei
galaxies: starburst
infrared: galaxies

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Díaz-Santos, T., Armus, L., Charmandaris, V., Stacey, G., Murphy, E. J., Haan, S., Stierwalt, S., Malhotra, S., Appleton, P., Inami, H., Magdis, G. E., Elbaz, D., Evans, A. S., Mazzarella, J. M., Surace, J. A., van der Werf, P. P., Xu, C. K., Lu, N., Meijerink, R., ... Sanders, D. B. (2014). Extended [C II] Emission in Local Luminous Infrared Galaxies. The Astrophysical Journal, 788(1), Article L17. https://doi.org/10.1088/2041-8205/788/1/L17

@article{eb6214a342714b1abf6aae49f611213b,

title = "Extended [C II] Emission in Local Luminous Infrared Galaxies",

abstract = "We present Herschel/PACS observations of extended [C II] 157.7 μm line emission detected on ~1-10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey. We find that most of the extra-nuclear emission show [C II]/FIR ratios >=4 × 10-3, larger than the mean ratio seen in the nuclei, and similar to those found in the extended disks of normal star-forming galaxies and the diffuse interstellar medium of our Galaxy. The [C II] {"}deficits{"} found in the most luminous local LIRGs are therefore restricted to their nuclei. There is a trend for LIRGs with warmer nuclei to show larger differences between their nuclear and extra-nuclear [C II]/FIR ratios. We find an anti-correlation between [C II]/FIR and the luminosity surface density, ΣIR, for the extended emission in the spatially resolved galaxies. However, there is an offset between this trend and that found for the LIRG nuclei. We use this offset to derive a beam filling-factor for the star-forming regions within the LIRG disks of ~6% relative to their nuclei. We confront the observed trend to photo-dissociation region models and find that the slope of the correlation is much shallower than the model predictions. Finally, we compare the correlation found between [C II]/FIR and ΣIR with measurements of high-redshift starbursting IR-luminous galaxies.",

keywords = "galaxies: ISM, galaxies: nuclei, galaxies: starburst, infrared: galaxies",

author = "T. D{\'i}az-Santos and L. Armus and V. Charmandaris and G. Stacey and Murphy, {E. J.} and S. Haan and S. Stierwalt and S. Malhotra and P. Appleton and H. Inami and Magdis, {G. E.} and D. Elbaz and Evans, {A. S.} and Mazzarella, {J. M.} and Surace, {J. A.} and {van der Werf}, {P. P.} and Xu, {C. K.} and N. Lu and R. Meijerink and Howell, {J. H.} and Petric, {A. O.} and S. Veilleux and Sanders, {D. B.}",

year = "2014",

month = jun,

doi = "10.1088/2041-8205/788/1/L17",

language = "English",

volume = "788",

journal = "The Astrophysical Journal",

publisher = "IoP Publishing",

number = "1",

}

Díaz-Santos, T, Armus, L, Charmandaris, V, Stacey, G, Murphy, EJ, Haan, S, Stierwalt, S, Malhotra, S, Appleton, P, Inami, H, Magdis, GE, Elbaz, D, Evans, AS, Mazzarella, JM, Surace, JA, van der Werf, PP, Xu, CK, Lu, N, Meijerink, R, Howell, JH, Petric, AO, Veilleux, S & Sanders, DB 2014, 'Extended [C II] Emission in Local Luminous Infrared Galaxies', The Astrophysical Journal, vol. 788, no. 1, L17. https://doi.org/10.1088/2041-8205/788/1/L17

TY - JOUR

T1 - Extended [C II] Emission in Local Luminous Infrared Galaxies

AU - Díaz-Santos, T.

AU - Armus, L.

AU - Charmandaris, V.

AU - Stacey, G.

AU - Murphy, E. J.

AU - Haan, S.

AU - Stierwalt, S.

AU - Malhotra, S.

AU - Appleton, P.

AU - Inami, H.

AU - Magdis, G. E.

AU - Elbaz, D.

AU - Evans, A. S.

AU - Mazzarella, J. M.

AU - Surace, J. A.

AU - van der Werf, P. P.

AU - Xu, C. K.

AU - Lu, N.

AU - Meijerink, R.

AU - Howell, J. H.

AU - Petric, A. O.

AU - Veilleux, S.

AU - Sanders, D. B.

PY - 2014/6

Y1 - 2014/6

N2 - We present Herschel/PACS observations of extended [C II] 157.7 μm line emission detected on ~1-10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey. We find that most of the extra-nuclear emission show [C II]/FIR ratios >=4 × 10-3, larger than the mean ratio seen in the nuclei, and similar to those found in the extended disks of normal star-forming galaxies and the diffuse interstellar medium of our Galaxy. The [C II] "deficits" found in the most luminous local LIRGs are therefore restricted to their nuclei. There is a trend for LIRGs with warmer nuclei to show larger differences between their nuclear and extra-nuclear [C II]/FIR ratios. We find an anti-correlation between [C II]/FIR and the luminosity surface density, ΣIR, for the extended emission in the spatially resolved galaxies. However, there is an offset between this trend and that found for the LIRG nuclei. We use this offset to derive a beam filling-factor for the star-forming regions within the LIRG disks of ~6% relative to their nuclei. We confront the observed trend to photo-dissociation region models and find that the slope of the correlation is much shallower than the model predictions. Finally, we compare the correlation found between [C II]/FIR and ΣIR with measurements of high-redshift starbursting IR-luminous galaxies.

AB - We present Herschel/PACS observations of extended [C II] 157.7 μm line emission detected on ~1-10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey. We find that most of the extra-nuclear emission show [C II]/FIR ratios >=4 × 10-3, larger than the mean ratio seen in the nuclei, and similar to those found in the extended disks of normal star-forming galaxies and the diffuse interstellar medium of our Galaxy. The [C II] "deficits" found in the most luminous local LIRGs are therefore restricted to their nuclei. There is a trend for LIRGs with warmer nuclei to show larger differences between their nuclear and extra-nuclear [C II]/FIR ratios. We find an anti-correlation between [C II]/FIR and the luminosity surface density, ΣIR, for the extended emission in the spatially resolved galaxies. However, there is an offset between this trend and that found for the LIRG nuclei. We use this offset to derive a beam filling-factor for the star-forming regions within the LIRG disks of ~6% relative to their nuclei. We confront the observed trend to photo-dissociation region models and find that the slope of the correlation is much shallower than the model predictions. Finally, we compare the correlation found between [C II]/FIR and ΣIR with measurements of high-redshift starbursting IR-luminous galaxies.

KW - galaxies: ISM

KW - galaxies: nuclei

KW - galaxies: starburst

KW - infrared: galaxies

UR - http://adsabs.harvard.edu/abs/2014ApJ...788L..17D

U2 - 10.1088/2041-8205/788/1/L17

DO - 10.1088/2041-8205/788/1/L17

M3 - Article

VL - 788

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

M1 - L17

ER -

Extended [C II] Emission in Local Luminous Infrared Galaxies

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