Far-infrared to millimeter astrophysical dust emission

Meny, C.; Gromov, V. D.; Boudet, Nathalie; Bernard, J.-P.; Paradis, D.; Nayral, Céline

doi:10.1051/0004-6361:20065771

Cited by 161 publications

(214 citation statements)

References 65 publications

Supporting

Mentioning

206

Contrasting

Order By: Relevance

“…Our results however do not rule out the hypothesis of a change in dust emissivity as a function of wavelength proposed in recent studies (e.g. Dupac et al 2003;Meny et al 2007). 6.…”

Section: Conclusion and Summarycontrasting

confidence: 99%

“…The submm excess could also be explained as a change in dust emissivity in lieu of the cold dust hypothesis. Models of Meny et al (2007) modify the dust optical properties to find an effective decrease in the submm emissivity index as the dust temperature increases as suggested by the observations of Dupac et al (2003). However, Shetty et al (2009) express caution in the inverse temperature -β interpretation, showing that flux uncertainties, especially in the Rayleigh-Jeans regime, can affect the results for the SED fits as far as temperature and emissivity are concerned.…”

Section: Refinement: Adding a Cold Dust Componentmentioning

confidence: 98%

“…The presence of this cold dust component is still a contentious issue in the ISM community and will have important consequences on our comprehension of ISM properties of low metallicity environments. Lisenfeld et al (2001), Reach et al (1995), Dumke et al (2004), Bendo et al (2006) or Meny et al (2007) suggested that changes in dust emission properties (changes in dust emissivity or resonances related to dust impurities) should be responsible for boosting submm emission above the 15−20 K thermal emission expected at these wavelengths. However, not all low metallicity galaxies show submm excess, as shown recently by the observations of the nearby Local Group Galaxy IC 10 (Parkin et al 2009, in prep.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing the dust properties of galaxies up to submillimetre wavelengths

Galametz¹,

Madden²,

Galliano³

et al. 2009

A&A

100

200

View full text Add to dashboard Cite

Aims. We study the dust properties of four low metallicity galaxies by modelling their spectral energy distributions. This modelling enables us to constrain the dust properties such as the mass, the temperature or the composition to characterise the global ISM properties in dwarf galaxies. Methods. We present 870 μm images of four low metallicity galaxies (NGC 1705, Haro 11, Mrk 1089 and UM 311) observed with the Large APEX BOlometer CAmera (LABOCA) on the Atacama Pathfinder EXperiment (APEX) telescope. We modeled their spectral energy distributions combining the submm observations of LABOCA, 2MASS, IRAS, Spitzer photometric data, and the IRS data for Haro 11. Results. We found that the PAH mass abundance is very low in these galaxies, 5 to 50 times lower than the PAH mass fraction of our Galaxy. We also found that a significant mass of dust is revealed when using submm constraints compared to that measured with only mid-IR to far-IR observations extending only to 160 μm. For NGC 1705 and Haro 11, an excess in submillimeter wavelengths was detected when we used our standard dust SED model. We rerun our SED procedure adding a cold dust component (10 K) to better describe the high 870 μm flux derived from LABOCA observations, which significantly improves the fit. We found that at least 70% of the dust mass of these two galaxies can reside in a cold dust component. We also showed that the subsequent dust-to-gas mass ratios, considering HI and CO observations, can be strikingly high for Haro 11 in comparison with what is usually expected for these low-metallicity environments. Furthermore, we derived the star formation rate of our galaxies and compared them to the Schmidt law. Haro 11 falls anomalously far from the Schmidt relation. These results may suggest that a reservoir of hidden gas could be present in molecular form not traced by the current CO observations. While there can be a significant cold dust mass found in Haro 11, the SED peaks at exceptionally short wavelengths (36 μm), also highlighting the importance of the much warmer dust component heated by the massive star clusters in Haro 11. We also derived the total IR luminosities derived from our models and compared them with relations that derive this luminosity from Spitzer bands. We found that the Draine & Li (2007) formula compares well to our direct IR determinations.

show abstract

“…Our results however do not rule out the hypothesis of a change in dust emissivity as a function of wavelength proposed in recent studies (e.g. Dupac et al 2003;Meny et al 2007). 6.…”

Section: Conclusion and Summarycontrasting

confidence: 99%

Section: Refinement: Adding a Cold Dust Componentmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Probing the dust properties of galaxies up to submillimetre wavelengths

Galametz¹,

Madden²,

Galliano³

et al. 2009

A&A

100

200

View full text Add to dashboard Cite

show abstract

“…The β values vary from 5 to 1 in the temperature range 7-20 K, with a behavior similar to that derived from ARCHEOPS data. These variations of β with dust temperature could be owing to intrinsic properties of amorphous dust grains, as proposed by Mény et al (2007), but the impact of the noise and the temperature mixing along the line of sight (LOS) must be carefully taken into consideration, before a physical interpretation can be made.Variations of the apparent spectral index in a sample of cores in the Galactic plane have been observed (Hill et al 2006) using SCUBA and SIMBA. A&A 520, L8 (2010) However, because of the restricted wavelength range of their observations, these authors could not attribute them to temperature variations.…”

Section: Introductionmentioning

confidence: 99%

Variations of the spectral index of dust emissivity from Hi-GAL observations of the Galactic plane

Paradis¹,

Veneziani

Noriega-Crespo³

et al. 2010

A&A

Self Cite

104

127

View full text Add to dashboard Cite

Context. Variations in the dust emissivity are critical for gas mass determinations derived from far-infrared observations, but also for separating dust foreground emission from the Cosmic Microwave Background (CMB). Hi-GAL observations allow us for the first time to study the dust emissivity variations in the inner regions of the Galactic plane at resolution below 1 • . Aims. We present maps of the emissivity spectral index derived from the combined Herschel PACS 160 μm, SPIRE 250 μm, 350 μm, and 500 μm data, and the IRIS 100 μm data, and we analyze the spatial variations of the spectral index as a function of dust temperature and wavelength in the two science demonstration phase Hi-GAL fields, centered at l = 30 • and l = 59 • . Methods. Applying two different methods, we determine both dust temperature and emissivity spectral index between 100 and 500 μm, at an angular resolution (θ) of 4 . Results. Combining both fields, the results show variations of the emissivity spectral index in the range 1.8-2.6 for temperatures between 14 and 23 K. The median values of the spectral index are similar in both fields, i.e. 2.3 in the range 100-500 μm, while the median dust temperatures are equal to 19.1 K and 16.0 K in the l = 30 • and l = 59 • field, respectively. Statistically, we do not see any significant deviations in the spectra from a power law emissivity between 100 and 500 μm. We confirm the existence of an inverse correlation between the emissivity spectral index and dust temperature, found in previous analyses.

show abstract

“…2 shows that the 500 m fluxes of VCC 1179 and VCC 1356 tend to be underestimated by the single-temperature fits. This difference could either be due to an additional cold ( 10 K) dust component [5][6][7], to an enhanced abundance of small grains [16] or to the different optical properties of the amorphous dust grains [17]. A more detailed discussion on the excess at 500 m can be found in [10].…”

Section: Dust Masses and Dust-to-gas Mass Ratiosmentioning

confidence: 99%

Dust Content of Virgo Star-Forming Dwarf Galaxies

Grossi

Hunt

Madden

et al. 2011

Astrophysics and Space Science Proceedings

View full text Add to dashboard Cite

We investigate the dust properties of a small sample of Virgo cluster dwarf galaxies drawn from the science demonstration phase data set of the Herschel Virgo Cluster Survey (HeViCS). These galaxies have low metallicities (7:8 < 12 C log.O=H/ < 8:3) and star formation rates <0.1 Mˇyr 1 . We measure the spectral energy distribution (SED) from 100 to 500 m and derive dust temperatures and masses. The SEDs are fitted by a cool component with T < 20 K, implying dust masses around 10 5 Mˇand dust-to-gas ratios (D) within the range 10 3 -10 2 .

show abstract

Far-infrared to millimeter astrophysical dust emission

Cited by 161 publications

References 65 publications

Probing the dust properties of galaxies up to submillimetre wavelengths

Probing the dust properties of galaxies up to submillimetre wavelengths

Variations of the spectral index of dust emissivity from Hi-GAL observations of the Galactic plane

Dust Content of Virgo Star-Forming Dwarf Galaxies

Contact Info

Product

Resources

About