<i>GALEX</i>OBSERVATIONS OF DIFFUSE ULTRAVIOLET EMISSION FROM DRACO

Sujatha, N. V.; Murthy, Jayant; Suresh, Rahul; Henry, R. C.; Bianchi, Luciana

doi:10.1088/0004-637x/723/2/1549

Cited by 26 publications

(29 citation statements)

References 35 publications

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“…A comparative review of past work can be found in Gordon (2004). Recently, GALEX observations provided diffuse UV background images with high spatial resolution, which have been used for the determination of the albedo and the g-factor in both the FUV (1350-1750 Å) and NUV (1750-2850 Å) bands (Sujatha et al 2009(Sujatha et al , 2010. Most of these studies showed that the interstellar grain causes a strong forward scattering in the FUV, with a moderate albedo, which is in good agreement with theoretical predictions.…”

Section: Introductionsupporting

confidence: 60%

Simulation Study of Dust-Scattered Far-Ultraviolet Emission in the Orion-Eridanus Superbubble

Jo¹,

Kang²,

Lim³

et al. 2012

ApJ

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We present the results of dust scattering simulations carried out for the Orion-Eridanus Superbubble region by comparing them with observations made in the far-ultraviolet. The albedo and the phase function asymmetry factor (g-factor) of interstellar grains were estimated, as were the distance and thickness of the dust layers. The results are as follows: 0.43 +0.02 −0.04 for the albedo and 0.45 +0.2 −0.2 for the g-factor, in good agreement with previous determinations and theoretical predictions. The distance of the assumed single dust layer, modeled for the Orion Molecular Cloud Complex, was estimated to be ∼110 pc and the thickness ranged from ∼130 at the core to ∼50 pc at the boundary for the region of present interest, implying that the dust cloud is located in front of the superbubble. The simulation result also indicates that a thin (∼10 pc) dust shell surrounds the inner X-ray cavities of hot gas at a distance of ∼70-90 pc.

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Section: Introductionsupporting

confidence: 60%

Simulation Study of Dust-Scattered Far-Ultraviolet Emission in the Orion-Eridanus Superbubble

Jo¹,

Kang²,

Lim³

et al. 2012

ApJ

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“…4. It is interesting to note that this curve follows exactly the same curve of Sujatha et al (2010) and Murthy et al (2001) even though the UV and IR values are totally different. The strong correlation (r = 0.75) between emissions in the FUV and NUV channels ( Fig.…”

Section: Resultssupporting

confidence: 78%

“…UV/IR intensity ratio strongly depends on the optical depth and local effects such as the variation of stellar radiation field in the region (Sujatha et al 2010). From Fig.…”

Section: Resultsmentioning

confidence: 99%

Multi-wavelength correlation studies of diffuse emission from the Aquila Rift

Jyothy

Sujatha

Karuppath

2018

Astrophys Space Sci

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We present a multi-wavelength correlation study of diffuse ultraviolet radiation using GALEX observations towards the Aquila Rift. Apart from airglow and zodiacal emissions, we find a diffuse background of 1300 -3700 ph cm −2 s −1 sr −1Å−1 in the far-ultraviolet (FUV: 1350 -1750Å) band and 1300 -2800 ph cm −2 s −1 sr −1Å−1 in the near-ultraviolet (NUV: 1750 -2850Å) band. The observed diffuse UV emissions are saturated with total as well as neutral hydrogen column density in the region due to high optical depth in UV (τ : 0.91-23.38). Higher values of FUV/NUV ratio in the region, greater than the threshold value of 0.6, along with the positive correlation between the ratio and FUV intensity are due to excess emission in the FUV band which is absent in the NUV band. We estimated the excess emission to be in the range ∼ 400 -2700 ph cm −2 s −1 sr −1Å−1 , plausibly due to H 2 fluorescence, ion line emissions and two-photon continuum emissions from the region in the FUV band, which also shows saturation in optically thick regions with N(H 2 ) as well as Hα emissions. Since N(H 2 ) and Hα emissions spread all over the region, the excess emission from the field is composite in nature and a detailed spectroscopic analysis is needed to disentangle the contribution from individual components.

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“…Our data point to bluer colours for brighter surface brightnesses. Sujatha et al (2010) find such an increase in the FUV/NUV ratio that they interpreted as a sign of fluorescent emission of molecular hydrogen. In our data, however, we cannot rule out a detection issue, as can be seen from Fig.…”

Section: Ultraviolet Cirrus Detectionmentioning

confidence: 89%

“…With the GALEX telescope and its Allsky Imaging Survey (AIS), extensive studies of the diffuse FUV emission became possible (e.g. Sujatha et al 2010;Hamden et al 2013;Murthy 2014).…”

Section: Introductionmentioning

confidence: 99%

The GALEX Ultraviolet Virgo Cluster Survey (GUViCS)

Boissier

Boselli

Voyer

et al. 2015

A&A

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Context. The Virgo direction has been observed at many wavelengths in recent years, in particular in the ultraviolet with GALEX. The far ultraviolet (FUV) diffuse light detected by GALEX offers interesting information on the large scale distribution of Galactic dust, owing to the GALEX FUV band sensitivity and resolution. Aims. We aim to characterise the ultraviolet large scale distribution of diffuse emission in the Virgo direction. A map of this emission may become useful for various studies by identifying regions where dust affects observations by either scattering light or absorbing radiation. Methods. We constructed mosaics of the FUV and near ultraviolet (NUV) diffuse emission over a large sky region (RA 12 to 13 h, Dec 0 to 20 deg) surrounding the Virgo cluster, using all the GALEX available data in the area. We tested for the first time the utilisation of the FUV diffuse light as a Galactic extinction E(B − V) tracer. Results. The FUV diffuse light scattered on cirrus reveals details about their geometry. Despite large dispersion, the FUV diffuse light correlates roughly with other Galactic dust tracers (coming from IRAS, Herschel, Planck), offering an opportunity to use the FUV emission to locate them in future studies with a better resolution (about 5 arcsec native resolution, 20 arcsec pixels maps presented in this paper) than for several usual tracers. Estimating the Galactic dust extinction on the basis of this emission allows us to find a smaller dispersion in the NUV − i colour of background galaxies at a given E(B − V) than with other tracers. The diffuse light mosaics obtained in this work are made publicly available.

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GALEXOBSERVATIONS OF DIFFUSE ULTRAVIOLET EMISSION FROM DRACO

Cited by 26 publications

References 35 publications

Simulation Study of Dust-Scattered Far-Ultraviolet Emission in the Orion-Eridanus Superbubble

Simulation Study of Dust-Scattered Far-Ultraviolet Emission in the Orion-Eridanus Superbubble

Multi-wavelength correlation studies of diffuse emission from the Aquila Rift

The GALEX Ultraviolet Virgo Cluster Survey (GUViCS)

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