scholarly journals Fitting spectral energy distributions of FMOS-COSMOS emission-line galaxies at z~1.6: Star formation rates, dust attenuation, and [OIII] lambda5007 emission-line luminosities

2021 ◽  
Author(s):  
J. A. Villa-Vélez ◽  
V. Buat ◽  
P. Theulé ◽  
M. Boquien ◽  
D. Burgarella
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Spectral Energy ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Emission Line Galaxies ◽  
Dust Attenuation

scholarly journals Erratum: ProSpect: generating spectral energy distributions with complex star formation and metallicity histories

2020 ◽  
Vol 500 (3) ◽  
pp. 2859-2860
Author(s):  
A S G Robotham ◽  
S Bellstedt ◽  
C del P Lagos ◽  
J E Thorne ◽  
L J Davies ◽  
...  
Keyword(s):  
Star Formation ◽  
Spectral Energy ◽  
Spectral Energy Distributions ◽  
Energy Distributions

scholarly journals Dense cores in the Seahorse infrared dark cloud: physical properties from modified blackbody fits to the far-infrared–submillimetre spectral energy distributions

2020 ◽  
Vol 644 ◽  
pp. A82
Author(s):  
O. Miettinen
Keyword(s):  
Star Formation ◽  
Physical Properties ◽  
Initial Conditions ◽  
High Mass ◽  
Spectral Energy ◽  
Mass Star ◽  
Wide Field ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Dense Cores

Context. Infrared dark clouds (IRDCs) can be the birth sites of high-mass stars, and hence determining the physical properties of dense cores in IRDCs is useful to constrain the initial conditions and theoretical models of high-mass star formation. Aims. We aim to determine the physical properties of dense cores in the filamentary Seahorse IRDC G304.74+01.32. Methods. We used data from the Wide-field Infrared Survey Explorer (WISE), Infrared Astronomical Satellite (IRAS), and Herschel in conjuction with our previous 350 and 870 μm observations with the Submillimetre APEX Bolometer Camera (SABOCA) and Large APEX BOlometer CAmera, and constructed the far-IR to submillimetre spectral energy distributions (SEDs) of the cores. The SEDs were fitted using single or two-temperature modified blackbody emission curves to derive the dust temperatures, masses, and luminosities of the cores. Results. For the 12 analysed cores, which include two IR dark cores (no WISE counterpart), nine IR bright cores, and one H II region, the mean dust temperature of the cold (warm) component, the mass, luminosity, H2 number density, and surface density were derived to be 13.3 ± 1.4 K (47.0 ± 5.0 K), 113 ± 29 M⊙, 192 ± 94 L⊙, (4.3 ± 1.2) × 105 cm−3, and 0.77 ± 0.19 g cm−3, respectively. The H II region IRAS 13039-6108a was found to be the most luminous source in our sample ((1.1 ± 0.4) × 103 L⊙). All the cores were found to be gravitationally bound (i.e. the virial parameter αvir < 2). Two out of the nine analysed IR bright cores (22%) were found to follow an accretion luminosity track under the assumptions that the mass accretion rate is 10−5 M⊙ yr−1, the stellar mass is 10% of the parent core mass, and the radius of the central star is 5 R⊙. Most of the remaing ten cores were found to lie within 1 dex below this accretion luminosity track. Seven out of 12 of the analysed cores (58%) were found to lie above the mass-radius thresholds of high-mass star formation proposed in the literature. The surface densities of Σ > 0.4 g cm−3 derived for these seven cores also exceed the corresponding threshold for high-mass star formation. Five of the analysed cores (42%) show evidence of fragmentation into two components in the SABOCA 350 μm image. Conclusions. In addition to the H II region source IRAS 13039-6108a, some of the other cores in Seahorse also appear to be capable of giving birth to high-mass stars. The 22 μm dark core SMM 9 is likely to be the youngest source in our sample that has the potential to form a high-mass star (96 ± 23 M⊙ within a radius of ~0.1 pc). The dense core population in the Seahorse IRDC has comparable average properties to the cores in the well-studied Snake IRDC G11.11-0.12 (e.g. Tdust and L agree within a factor of ~1.8); furthermore, the Seahorse, which lies ~60 pc above the Galactic plane, appears to be a smaller (e.g. three times shorter in projection, ~100 times less massive) version of the Snake. The Seahorse core fragmentation mechanisms appear to be heterogenous, including cases of both thermal and non-thermal Jeans instability. High-resolution follow-up studies are required to address the fragmented cores’ genuine potential of forming high-mass stars.

scholarly journals Which attenuation curves for star-forming galaxies?

2019 ◽  
Vol 15 (S341) ◽  
pp. 70-73
Author(s):  
Véronique Buat ◽  
David Corre ◽  
Médéric Boquien ◽  
Katarzyna Małek
Keyword(s):  
Radiative Transfer ◽  
Spectral Energy ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Star Forming ◽  
Radiative Transfer Models ◽  
Attenuation Law ◽  
Dust Attenuation ◽  
Attenuation Laws ◽  
Transfer Models

AbstractDust attenuation shapes the spectral energy distributions of galaxies and any modelling and fitting procedure of their spectral energy distributions must account for this process. We present results of two recent works dedicated at measuring the dust attenuation curves in star forming galaxies at redshift from 0.5 to 3, by fitting continuum (photometric) and line (spectroscopic) measurements simultaneously with CIGALE using variable attenuation laws based on flexible recipes. Both studies conclude to a large variety of effective attenuation laws with an attenuation law flattening when the obscuration increases. An extra attenuation is found for nebular lines. The comparison with radiative transfer models implies a flattening of the attenuation law up to near infrared wavelengths, which is well reproduced with a power-laws recipe inspired by the Charlot and Fall recipe. Here we propose a global modification of the Calzetti attenuation law to better reproduce the results of radiative transfer models.

scholarly journals TRIGGERED OR SELF-REGULATED STAR FORMATION WITHIN INTERMEDIATE REDSHIFT LUMINOUS INFRARED GALAXIES. I. MORPHOLOGIES AND SPECTRAL ENERGY DISTRIBUTIONS

2008 ◽  
Vol 135 (4) ◽  
pp. 1207-1224 ◽  
Author(s):  
J. Melbourne ◽  
M. Ammons ◽  
S. A. Wright ◽  
A. Metevier ◽  
E. Steinbring ◽  
...  
Keyword(s):  
Star Formation ◽  
Spectral Energy ◽  
Infrared Galaxies ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Luminous Infrared Galaxies ◽  
Intermediate Redshift

scholarly journals Ultraviolet through Infrared Spectral Energy Distributions from 1000 SDSS Galaxies: Dust Attenuation

2007 ◽  
Vol 173 (2) ◽  
pp. 392-403 ◽  
Author(s):  
Benjamin D. Johnson ◽  
David Schiminovich ◽  
Mark Seibert ◽  
Marie Treyer ◽  
D. Christopher Martin ◽  
...  
Keyword(s):  
Spectral Energy ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Infrared Spectral ◽  
Dust Attenuation

scholarly journals The imprint of rapid star formation quenching on the spectral energy distributions of galaxies

2015 ◽  
Vol 585 ◽  
pp. A43 ◽  
Author(s):  
L. Ciesla ◽  
A. Boselli ◽  
D. Elbaz ◽  
S. Boissier ◽  
V. Buat ◽  
...  
Keyword(s):  
Star Formation ◽  
Spectral Energy ◽  
Spectral Energy Distributions ◽  
Energy Distributions

scholarly journals Multiwavelength Energy Distributions of Ultraluminous IRAS Galaxies

1994 ◽  
Vol 159 ◽  
pp. 332-332
Author(s):  
D. Rigopoulou ◽  
A. Lawrence
Keyword(s):  
Energy Source ◽  
Star Formation ◽  
Active Galaxies ◽  
Spectral Energy ◽  
Published Data ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Space Density ◽  
X Ray

Ultraluminous IRAS Galaxies (ULG's) have luminosities comparable to quasars while their space density is much higher than that of active galaxies. Much debate has centered around the origin of the energy source for these objects, whether this is a burst of star formation or a hidden quasar. The sample studied here is the Sanders et al. (1988) sample, 10 objects with LFIR ≥ 1012L⊙. We discuss our new observations at X-ray and submm wavelengths together with other published data for some of the objects. Some useful ideas can be gained from comparisons of the shape of the spectral energy distributions (SED's) of the ultraluminous objects with other “archetype” objects such as typical starbursts i.e. M82 or type 2 AGN i.e. NGC1068.

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