Flammability and combustibility of potential species for use as fuel breaks

Santos, João Francisco Labres dos; Batista, Antônio Carlos; Kovalsyki, Bruna; Tetto, Alexandre França; Tres, Andressa

doi:10.14195/978-989-26-16-506_86

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The [C II] deficit is known to be strongly correlated with infrared surface brightness, or equivalently star-formation surface density (Díaz-Santos et al 2014;Lutz et al 2016;Smith et al 2017). Thus our measured high dust temperatures and large [C II] deficit may both be explained if our z ∼ 4.5 SMGs have high starformation rate surface densities, compared to previouslystudied sources.…”

Section: [C Ii] Deficitmentioning

confidence: 99%

An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Identifying Candidate z ∼ 4.5 [C II] Emitters

Cooke

Smail

Swinbank

et al. 2018

ApJ

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We report the results of a search for serendipitous [C II] 157.74 µm emitters at z ≃ 4.4-4.7 using the Atacama Large Millimeter/submillimeter Array (ALMA). The search exploits the AS2UDS continuum survey, which covers ∼ 50 arcmin 2 of the sky towards 695 luminous (S 870 1 mJy) submillimeter galaxies (SMGs), selected from the SCUBA-2 Cosmology Legacy Survey (S2CLS) 0.96 deg 2 Ultra Deep Survey (UDS) field. We detect ten candidate line emitters, with an expected false detection rate of ten percent. All of these line emitters correspond to 870 µm continuum-detected sources in AS2UDS. The emission lines in two emitters appear to be high-J CO, but the remainder have multiwavelength properties consistent with [C II] from z ≃ 4.5 galaxies. Using our sample, we place a lower limit of > 5 × 10 −6 Mpc −3 on the space density of luminous (L IR ≃ 10 13 L ⊙ ) SMGs at z = 4.40-4.66, suggesting ≥ 7 percent of SMGs with S 870µm 1 mJy lie at 4 < z < 5. From stacking the highresolution (∼ 0.15 ′′ full-width half maximum) ALMA 870 µm imaging, we show that the [C II] line emission is more extended than the continuum dust emission, with an average effective radius for the [C II] of r e = 1.7 +0.1 −0.2 kpc compared to r e = 1.0 ± 0.1 kpc for the continuum (rest-frame 160 µm). By fitting the far-infrared photometry for these galaxies from 100-870 µm, we show that SMGs at z ∼ 4.5 have a median dust temperature of T d = 55 ± 4 K. This is systematically warmer than 870 µm-selected SMGs at z ≃ 2, which typically have temperatures around 35 K. These z ≃ 4.5 SMGs display a steeper trend in the luminosity-temperature plane than z ≤ 2 SMGs. We discuss the implications of this result in terms of the selection biases of high redshift starbursts in far-infrared/submillimeter surveys.

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Section: [C Ii] Deficitmentioning

confidence: 99%

An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Identifying Candidate z ∼ 4.5 [C II] Emitters

Cooke

Smail

Swinbank

et al. 2018

ApJ

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“…In addition, collisions with free electrons in highly ionized H II regions can also excite the the [C II] transition (see Goldsmith et al 2012). In normal galaxies and in the extended disks of IR luminous galaxies, this process forms the basis of the strong correlation between star formation and [C II] emission (see Malhotra et al 2001, Díaz-Santos et al 2014, Herrera-Camus et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Jet-related Excitation of the [C ii] Emission in the Active Galaxy NGC 4258 with SOFIA

Appleton

Díaz-Santos

Fadda

et al. 2018

ApJ

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We detect widespread [C II] 157.7 µm emission from the inner 5 kpc of the active galaxy NGC 4258 with the SOFIA integral field spectrometer FIFI-LS. The emission is found associated with warm H 2 , distributed along and beyond the end of southern jet, in a zone known to contain shock-excited optical filaments. It is also associated with soft X-ray hot-spots, which are the counterparts of the "anomalous radio arms" of NGC 4258, and a 1 kpc-long filament on the minor axis of the galaxy which contains young star clusters. Palomar-CWI Hα integral field spectroscopy shows that the filament exhibits non-circular motions within NGC 4258. Many of the [C II] profiles are very broad, with the highest line width, 455 km s −1 , observed at the position of the southern jet bow-shock. Abnormally high ratios of L([C II])/L(FIR) and L([C II])/L(PAH7.7 µm) are found along and beyond the southern jet and in the X-ray hotspots. These are the same regions that exhibit unusually large intrinsic [C II] line widths. This suggests that the [C II] traces warm molecular gas in shocks and turbulence associated with the jet. We estimate that as much as 40% (3.8 × 10 39 erg s −1 ) of the total [C II] luminosity from the inner 5 kpc of NGC 4258 arises in shocks and turbulence (< 1% bolometric luminosity from the active nucleus), the rest being consistent with [C II] excitation associated with star formation. We propose that the highly-inclined jet is colliding with, and being deflected around, dense irregularities in a thick disk, leading to significant energy dissipation over a wide area of the galaxy.

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“…Herschel observations have demonstrated a high capability of FIR observations to study heavy element migration in the Universe. These observations include measurements of high-scale galactic matter outflows, such as galactic wind in M82 [175], observations of bright infrared galaxies [179] and dust migration in galactic disks and their outskirts (see the discussion in Section 6.2). Thus, observations by Herschel telescope provided new insights into the nature of driving mechanisms of such outflows, and posed several new questions about their role in the dynamical and chemical evolution of galaxies and the Universe as a whole (for a discussion see [175,180]).…”

Section: Dynamics Of Interstellar Medium and Chemical Evolution Of Th...mentioning

confidence: 99%

Review of scientific topics for the Millimetron space observatory

et al. 2014

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This paper describes outstanding issues in astrophysics and cosmology that can be solved by astronomical observations in a broad spectral range from far infrared to millimeter wavelengths. The discussed problems related to the formation of stars and planets, galaxies and the interstellar medium, studies of black holes and the development of the cosmological model can be addressed by the planned space observatory Millimetron (the "Spectr-M" project) equipped with a cooled 10-m mirror. Millimetron can operate both as a single-dish telescope and as a part of a space-ground interferometer with very long baseline.

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Flammability and combustibility of potential species for use as fuel breaks

Cited by 3 publications

References 12 publications

An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Identifying Candidate z ∼ 4.5 [C II] Emitters

An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Identifying Candidate z ∼ 4.5 [C II] Emitters

Jet-related Excitation of the [C ii] Emission in the Active Galaxy NGC 4258 with SOFIA

Review of scientific topics for the Millimetron space observatory

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