Explaining the [CII]157.7 μm deficit in luminous infrared galaxies-first results from a herschel/pacs study of the goals sample

T. Díaz-Santos, L. Armus, V. Charmandaris, S. Stierwalt, E. J. Murphy, S. Haan, H. Inami, S. Malhotra, R. Meijerink, G. Stacey, A. O. Petric, A. S. Evans, S. Veilleux, P. P. Van Der Werf, S. Lord, N. Lu, J. H. Howell, P. Appleton, J. M. Mazzarella, J. A. SuraceC. K. Xu, B. Schulz, D. B. Sanders, C. Bridge, B. H P Chan, D. T. Frayer, K. Iwasawa, J. Melbourne, E. Sturm

Research output: Contribution to journalArticle

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Abstract

We present the first results of a survey of the [C II]157.7 μm emission line in 241 luminous infrared galaxies (LIRGs) comprising the Great Observatories All-sky LIRG Survey (GOALS) sample, obtained with the PACS instrument on board the Herschel Space Observatory. The [C II] luminosities, L [C II], of the LIRGs in GOALS range from ∼107 to 2 × 109 L. We find that LIRGs show a tight correlation of [C II]/FIR with far-IR (FIR) flux density ratios, with a strong negative trend spanning from ∼10-2 to 10-4, as the average temperature of dust increases. We find correlations between the [C II]/FIR ratio and the strength of the 9.7 μm silicate absorption feature as well as with the luminosity surface density of the mid-IR emitting region (ΣMIR), suggesting that warmer, more compact starbursts have substantially smaller [C II]/FIR ratios. Pure star-forming LIRGs have a mean [C II]/FIR ∼ 4 × 10-3, while galaxies with low polycyclic aromatic hydrocarbon (PAH) equivalent widths (EWs), indicative of the presence of active galactic nuclei (AGNs), span the full range in [C II]/FIR. However, we show that even when only pure star-forming galaxies are considered, the [C II]/FIR ratio still drops by an order of magnitude, from 10-2 to 10-3, with ΣMIR and ΣIR, implying that the [C II]157.7 μm luminosity is not a good indicator of the star formation rate (SFR) for most local LIRGs, for it does not scale linearly with the warm dust emission most likely associated to the youngest stars. Moreover, even in LIRGs in which we detect an AGN in the mid-IR, the majority (2/3) of galaxies show [C II]/FIR ≥ 10-3 typical of high 6.2 μm PAH EW sources, suggesting that most AGNs do not contribute significantly to the FIR emission. We provide an empirical relation between the [C II]/FIR and the specific SFR for star-forming LIRGs. Finally, we present predictions for the starburst size based on the observed [C II] and FIR luminosities which should be useful for comparing with results from future surveys of high-redshift galaxies with ALMA and CCAT.

Original languageEnglish (US)
Article number68
JournalAstrophysical Journal
Volume774
Issue number1
DOIs
StatePublished - Sep 1 2013

Fingerprint

galaxies
observatory
PAH
dust
luminosity
active galactic nuclei
stars
observatories
silicate
polycyclic aromatic hydrocarbons
star formation rate
prediction
temperature
sky
rate
silicates
flux density
trends
predictions
indicator

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Explaining the [CII]157.7 μm deficit in luminous infrared galaxies-first results from a herschel/pacs study of the goals sample. / Díaz-Santos, T.; Armus, L.; Charmandaris, V.; Stierwalt, S.; Murphy, E. J.; Haan, S.; Inami, H.; Malhotra, S.; Meijerink, R.; Stacey, G.; Petric, A. O.; Evans, A. S.; Veilleux, S.; Van Der Werf, P. P.; Lord, S.; Lu, N.; Howell, J. H.; Appleton, P.; Mazzarella, J. M.; Surace, J. A.; Xu, C. K.; Schulz, B.; Sanders, D. B.; Bridge, C.; Chan, B. H P; Frayer, D. T.; Iwasawa, K.; Melbourne, J.; Sturm, E.

In: Astrophysical Journal, Vol. 774, No. 1, 68, 01.09.2013.

Research output: Contribution to journalArticle

Díaz-Santos, T, Armus, L, Charmandaris, V, Stierwalt, S, Murphy, EJ, Haan, S, Inami, H, Malhotra, S, Meijerink, R, Stacey, G, Petric, AO, Evans, AS, Veilleux, S, Van Der Werf, PP, Lord, S, Lu, N, Howell, JH, Appleton, P, Mazzarella, JM, Surace, JA, Xu, CK, Schulz, B, Sanders, DB, Bridge, C, Chan, BHP, Frayer, DT, Iwasawa, K, Melbourne, J & Sturm, E 2013, 'Explaining the [CII]157.7 μm deficit in luminous infrared galaxies-first results from a herschel/pacs study of the goals sample', Astrophysical Journal, vol. 774, no. 1, 68. https://doi.org/10.1088/0004-637X/774/1/68
Díaz-Santos, T. ; Armus, L. ; Charmandaris, V. ; Stierwalt, S. ; Murphy, E. J. ; Haan, S. ; Inami, H. ; Malhotra, S. ; Meijerink, R. ; Stacey, G. ; Petric, A. O. ; Evans, A. S. ; Veilleux, S. ; Van Der Werf, P. P. ; Lord, S. ; Lu, N. ; Howell, J. H. ; Appleton, P. ; Mazzarella, J. M. ; Surace, J. A. ; Xu, C. K. ; Schulz, B. ; Sanders, D. B. ; Bridge, C. ; Chan, B. H P ; Frayer, D. T. ; Iwasawa, K. ; Melbourne, J. ; Sturm, E. / Explaining the [CII]157.7 μm deficit in luminous infrared galaxies-first results from a herschel/pacs study of the goals sample. In: Astrophysical Journal. 2013 ; Vol. 774, No. 1.
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abstract = "We present the first results of a survey of the [C II]157.7 μm emission line in 241 luminous infrared galaxies (LIRGs) comprising the Great Observatories All-sky LIRG Survey (GOALS) sample, obtained with the PACS instrument on board the Herschel Space Observatory. The [C II] luminosities, L [C II], of the LIRGs in GOALS range from ∼107 to 2 × 109 L. We find that LIRGs show a tight correlation of [C II]/FIR with far-IR (FIR) flux density ratios, with a strong negative trend spanning from ∼10-2 to 10-4, as the average temperature of dust increases. We find correlations between the [C II]/FIR ratio and the strength of the 9.7 μm silicate absorption feature as well as with the luminosity surface density of the mid-IR emitting region (ΣMIR), suggesting that warmer, more compact starbursts have substantially smaller [C II]/FIR ratios. Pure star-forming LIRGs have a mean [C II]/FIR ∼ 4 × 10-3, while galaxies with low polycyclic aromatic hydrocarbon (PAH) equivalent widths (EWs), indicative of the presence of active galactic nuclei (AGNs), span the full range in [C II]/FIR. However, we show that even when only pure star-forming galaxies are considered, the [C II]/FIR ratio still drops by an order of magnitude, from 10-2 to 10-3, with ΣMIR and ΣIR, implying that the [C II]157.7 μm luminosity is not a good indicator of the star formation rate (SFR) for most local LIRGs, for it does not scale linearly with the warm dust emission most likely associated to the youngest stars. Moreover, even in LIRGs in which we detect an AGN in the mid-IR, the majority (2/3) of galaxies show [C II]/FIR ≥ 10-3 typical of high 6.2 μm PAH EW sources, suggesting that most AGNs do not contribute significantly to the FIR emission. We provide an empirical relation between the [C II]/FIR and the specific SFR for star-forming LIRGs. Finally, we present predictions for the starburst size based on the observed [C II] and FIR luminosities which should be useful for comparing with results from future surveys of high-redshift galaxies with ALMA and CCAT.",
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TY - JOUR

T1 - Explaining the [CII]157.7 μm deficit in luminous infrared galaxies-first results from a herschel/pacs study of the goals sample

AU - Díaz-Santos, T.

AU - Armus, L.

AU - Charmandaris, V.

AU - Stierwalt, S.

AU - Murphy, E. J.

AU - Haan, S.

AU - Inami, H.

AU - Malhotra, S.

AU - Meijerink, R.

AU - Stacey, G.

AU - Petric, A. O.

AU - Evans, A. S.

AU - Veilleux, S.

AU - Van Der Werf, P. P.

AU - Lord, S.

AU - Lu, N.

AU - Howell, J. H.

AU - Appleton, P.

AU - Mazzarella, J. M.

AU - Surace, J. A.

AU - Xu, C. K.

AU - Schulz, B.

AU - Sanders, D. B.

AU - Bridge, C.

AU - Chan, B. H P

AU - Frayer, D. T.

AU - Iwasawa, K.

AU - Melbourne, J.

AU - Sturm, E.

PY - 2013/9/1

Y1 - 2013/9/1

N2 - We present the first results of a survey of the [C II]157.7 μm emission line in 241 luminous infrared galaxies (LIRGs) comprising the Great Observatories All-sky LIRG Survey (GOALS) sample, obtained with the PACS instrument on board the Herschel Space Observatory. The [C II] luminosities, L [C II], of the LIRGs in GOALS range from ∼107 to 2 × 109 L. We find that LIRGs show a tight correlation of [C II]/FIR with far-IR (FIR) flux density ratios, with a strong negative trend spanning from ∼10-2 to 10-4, as the average temperature of dust increases. We find correlations between the [C II]/FIR ratio and the strength of the 9.7 μm silicate absorption feature as well as with the luminosity surface density of the mid-IR emitting region (ΣMIR), suggesting that warmer, more compact starbursts have substantially smaller [C II]/FIR ratios. Pure star-forming LIRGs have a mean [C II]/FIR ∼ 4 × 10-3, while galaxies with low polycyclic aromatic hydrocarbon (PAH) equivalent widths (EWs), indicative of the presence of active galactic nuclei (AGNs), span the full range in [C II]/FIR. However, we show that even when only pure star-forming galaxies are considered, the [C II]/FIR ratio still drops by an order of magnitude, from 10-2 to 10-3, with ΣMIR and ΣIR, implying that the [C II]157.7 μm luminosity is not a good indicator of the star formation rate (SFR) for most local LIRGs, for it does not scale linearly with the warm dust emission most likely associated to the youngest stars. Moreover, even in LIRGs in which we detect an AGN in the mid-IR, the majority (2/3) of galaxies show [C II]/FIR ≥ 10-3 typical of high 6.2 μm PAH EW sources, suggesting that most AGNs do not contribute significantly to the FIR emission. We provide an empirical relation between the [C II]/FIR and the specific SFR for star-forming LIRGs. Finally, we present predictions for the starburst size based on the observed [C II] and FIR luminosities which should be useful for comparing with results from future surveys of high-redshift galaxies with ALMA and CCAT.

AB - We present the first results of a survey of the [C II]157.7 μm emission line in 241 luminous infrared galaxies (LIRGs) comprising the Great Observatories All-sky LIRG Survey (GOALS) sample, obtained with the PACS instrument on board the Herschel Space Observatory. The [C II] luminosities, L [C II], of the LIRGs in GOALS range from ∼107 to 2 × 109 L. We find that LIRGs show a tight correlation of [C II]/FIR with far-IR (FIR) flux density ratios, with a strong negative trend spanning from ∼10-2 to 10-4, as the average temperature of dust increases. We find correlations between the [C II]/FIR ratio and the strength of the 9.7 μm silicate absorption feature as well as with the luminosity surface density of the mid-IR emitting region (ΣMIR), suggesting that warmer, more compact starbursts have substantially smaller [C II]/FIR ratios. Pure star-forming LIRGs have a mean [C II]/FIR ∼ 4 × 10-3, while galaxies with low polycyclic aromatic hydrocarbon (PAH) equivalent widths (EWs), indicative of the presence of active galactic nuclei (AGNs), span the full range in [C II]/FIR. However, we show that even when only pure star-forming galaxies are considered, the [C II]/FIR ratio still drops by an order of magnitude, from 10-2 to 10-3, with ΣMIR and ΣIR, implying that the [C II]157.7 μm luminosity is not a good indicator of the star formation rate (SFR) for most local LIRGs, for it does not scale linearly with the warm dust emission most likely associated to the youngest stars. Moreover, even in LIRGs in which we detect an AGN in the mid-IR, the majority (2/3) of galaxies show [C II]/FIR ≥ 10-3 typical of high 6.2 μm PAH EW sources, suggesting that most AGNs do not contribute significantly to the FIR emission. We provide an empirical relation between the [C II]/FIR and the specific SFR for star-forming LIRGs. Finally, we present predictions for the starburst size based on the observed [C II] and FIR luminosities which should be useful for comparing with results from future surveys of high-redshift galaxies with ALMA and CCAT.

KW - galaxies: ISM

KW - galaxies: nuclei

KW - galaxies: starburst

KW - infrared: galaxies

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