Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs

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Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs. / Hernan-Caballero, Antonio; Spoon, Henrik W. W.; Alonso-Herrero, Almudena; Hatziminaoglou, Evanthia; Magdis, Georgios E.; Perez-Gonzalez, Pablo G.; Pereira-Santaella, Miguel; Arribas, Santiago; Cortzen, Isabella; Labiano, Alvaro; Piqueras, Javier; Rigopoulou, Dimitra.

In: Monthly Notices of the Royal Astronomical Society, Vol. 497, No. 4, 05.08.2020, p. 4614-4625.

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

Harvard

Hernan-Caballero, A, Spoon, HWW, Alonso-Herrero, A, Hatziminaoglou, E, Magdis, GE, Perez-Gonzalez, PG, Pereira-Santaella, M, Arribas, S, Cortzen, I, Labiano, A, Piqueras, J & Rigopoulou, D 2020, 'Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs', Monthly Notices of the Royal Astronomical Society, vol. 497, no. 4, pp. 4614-4625. https://doi.org/10.1093/mnras/staa2282

APA

Hernan-Caballero, A., Spoon, H. W. W., Alonso-Herrero, A., Hatziminaoglou, E., Magdis, G. E., Perez-Gonzalez, P. G., Pereira-Santaella, M., Arribas, S., Cortzen, I., Labiano, A., Piqueras, J., & Rigopoulou, D. (2020). Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs. Monthly Notices of the Royal Astronomical Society, 497(4), 4614-4625. https://doi.org/10.1093/mnras/staa2282

Vancouver

Hernan-Caballero A, Spoon HWW, Alonso-Herrero A, Hatziminaoglou E, Magdis GE, Perez-Gonzalez PG et al. Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs. Monthly Notices of the Royal Astronomical Society. 2020 Aug 5;497(4):4614-4625. https://doi.org/10.1093/mnras/staa2282

Author

Hernan-Caballero, Antonio ; Spoon, Henrik W. W. ; Alonso-Herrero, Almudena ; Hatziminaoglou, Evanthia ; Magdis, Georgios E. ; Perez-Gonzalez, Pablo G. ; Pereira-Santaella, Miguel ; Arribas, Santiago ; Cortzen, Isabella ; Labiano, Alvaro ; Piqueras, Javier ; Rigopoulou, Dimitra. / Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs. In: Monthly Notices of the Royal Astronomical Society. 2020 ; Vol. 497, No. 4. pp. 4614-4625.

Bibtex

@article{718782a206774168af0f261c1e26db8c,
title = "Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs",
abstract = "We present a method for recovering the intrinsic (extinction-corrected) luminosity of the 11.2 mu m PAH band in galaxy spectra. Using 105 high S/N Spitzer/IRS spectra of star-forming galaxies, we show that the equivalent width ratio of the 12.7 and 11.2 mu m PAH bands is independent on the optical depth (tau), with small dispersion (similar to 5 percent) indicative of a nearly constant intrinsic flux ratio R-int = (f(12.7)/f(11.2))(int) = 0.377 +/- 0.020. Conversely, the observed flux ratio, R-obs = (f(12.7)/f(11.2))(obs), strongly correlates with the silicate strength (S-sil) confirming that differences in R-obs reflect variation in tau. The relation between R-obs and S-sil reproduces predictions for the Galactic Centre extinction law but disagrees with other laws. We calibrate the total extinction affecting the 11.2 mu m PAH from R-obs, which we apply to another sample of 215 galaxies with accurate measurements of the total infrared luminosity (L-IR) to investigate the impact of extinction on L-11.2/L-IR. Correlation between L-11.2/L-IR and R-obs independently on L-IR suggests that increased extinction explains the well-known decrease in the average L-11.2/L-IR at high L-IR. The extinction-corrected L-11.2 is proportional to L-IR in the range L-IR = 10(9)-10(13) L-circle dot. These results consolidate L-11.2 as a robust tracer of star formation in galaxies.",
keywords = "dust, extinction, galaxies: ISM, galaxies: star formation, infrared: galaxies, infrared: ISM, POLYCYCLIC-AROMATIC-HYDROCARBON, ACTIVE GALACTIC NUCLEI, STAR-FORMATION RATES, INFRARED-EMISSION, MIDINFRARED SPECTROSCOPY, INTERSTELLAR DUST, GALAXIES, FEATURES, DISTRIBUTIONS, SPECTROGRAPH",
author = "Antonio Hernan-Caballero and Spoon, {Henrik W. W.} and Almudena Alonso-Herrero and Evanthia Hatziminaoglou and Magdis, {Georgios E.} and Perez-Gonzalez, {Pablo G.} and Miguel Pereira-Santaella and Santiago Arribas and Isabella Cortzen and Alvaro Labiano and Javier Piqueras and Dimitra Rigopoulou",
year = "2020",
month = aug,
day = "5",
doi = "10.1093/mnras/staa2282",
language = "English",
volume = "497",
pages = "4614--4625",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

RIS

TY - JOUR

T1 - Extinction in the 11.2 mu m PAH band and the low L-11.2/L-IR in ULIRGs

AU - Hernan-Caballero, Antonio

AU - Spoon, Henrik W. W.

AU - Alonso-Herrero, Almudena

AU - Hatziminaoglou, Evanthia

AU - Magdis, Georgios E.

AU - Perez-Gonzalez, Pablo G.

AU - Pereira-Santaella, Miguel

AU - Arribas, Santiago

AU - Cortzen, Isabella

AU - Labiano, Alvaro

AU - Piqueras, Javier

AU - Rigopoulou, Dimitra

PY - 2020/8/5

Y1 - 2020/8/5

N2 - We present a method for recovering the intrinsic (extinction-corrected) luminosity of the 11.2 mu m PAH band in galaxy spectra. Using 105 high S/N Spitzer/IRS spectra of star-forming galaxies, we show that the equivalent width ratio of the 12.7 and 11.2 mu m PAH bands is independent on the optical depth (tau), with small dispersion (similar to 5 percent) indicative of a nearly constant intrinsic flux ratio R-int = (f(12.7)/f(11.2))(int) = 0.377 +/- 0.020. Conversely, the observed flux ratio, R-obs = (f(12.7)/f(11.2))(obs), strongly correlates with the silicate strength (S-sil) confirming that differences in R-obs reflect variation in tau. The relation between R-obs and S-sil reproduces predictions for the Galactic Centre extinction law but disagrees with other laws. We calibrate the total extinction affecting the 11.2 mu m PAH from R-obs, which we apply to another sample of 215 galaxies with accurate measurements of the total infrared luminosity (L-IR) to investigate the impact of extinction on L-11.2/L-IR. Correlation between L-11.2/L-IR and R-obs independently on L-IR suggests that increased extinction explains the well-known decrease in the average L-11.2/L-IR at high L-IR. The extinction-corrected L-11.2 is proportional to L-IR in the range L-IR = 10(9)-10(13) L-circle dot. These results consolidate L-11.2 as a robust tracer of star formation in galaxies.

AB - We present a method for recovering the intrinsic (extinction-corrected) luminosity of the 11.2 mu m PAH band in galaxy spectra. Using 105 high S/N Spitzer/IRS spectra of star-forming galaxies, we show that the equivalent width ratio of the 12.7 and 11.2 mu m PAH bands is independent on the optical depth (tau), with small dispersion (similar to 5 percent) indicative of a nearly constant intrinsic flux ratio R-int = (f(12.7)/f(11.2))(int) = 0.377 +/- 0.020. Conversely, the observed flux ratio, R-obs = (f(12.7)/f(11.2))(obs), strongly correlates with the silicate strength (S-sil) confirming that differences in R-obs reflect variation in tau. The relation between R-obs and S-sil reproduces predictions for the Galactic Centre extinction law but disagrees with other laws. We calibrate the total extinction affecting the 11.2 mu m PAH from R-obs, which we apply to another sample of 215 galaxies with accurate measurements of the total infrared luminosity (L-IR) to investigate the impact of extinction on L-11.2/L-IR. Correlation between L-11.2/L-IR and R-obs independently on L-IR suggests that increased extinction explains the well-known decrease in the average L-11.2/L-IR at high L-IR. The extinction-corrected L-11.2 is proportional to L-IR in the range L-IR = 10(9)-10(13) L-circle dot. These results consolidate L-11.2 as a robust tracer of star formation in galaxies.

KW - dust

KW - extinction

KW - galaxies: ISM

KW - galaxies: star formation

KW - infrared: galaxies

KW - infrared: ISM

KW - POLYCYCLIC-AROMATIC-HYDROCARBON

KW - ACTIVE GALACTIC NUCLEI

KW - STAR-FORMATION RATES

KW - INFRARED-EMISSION

KW - MIDINFRARED SPECTROSCOPY

KW - INTERSTELLAR DUST

KW - GALAXIES

KW - FEATURES

KW - DISTRIBUTIONS

KW - SPECTROGRAPH

U2 - 10.1093/mnras/staa2282

DO - 10.1093/mnras/staa2282

M3 - Journal article

VL - 497

SP - 4614

EP - 4625

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 4

ER -

ID: 252295213