A Computerized Model of Large-Scale Visual Interstellar Extinction

Hakkila, Jon; Myers, J. M.; Stidham, Brett J.; Hartmann, D. H.

doi:10.1086/118624

Cited by 186 publications

(251 citation statements)

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“…5). Fitzgerald 1968) in the routine by Hakkila et al (1997). The analytical model tends to overpredict the extinction by an order of magnitude, especially at larger distances.…”

Section: Testing the Models And Further Improvementsmentioning

confidence: 96%

“…Then we proceed to a few of the rare neutron stars with well known distances, having also small error bars for the absorbing N(H) derived by X-ray observations. As Hakkila et al (1997) note, different studies do not agree precisely with each other due to the various applied Hobbs et al (1988); a log(N(Nai)) = 10.6 < 11 Ferlet et al (1985) formula was doubted by Welty et al (1994) Kharchenko et al (2005a,b). To convert the reddening E(B −V ) we apply the formula by Paresce (1984): N (H) = 5.5 × 10 21 E(B − V ) cm −2 .…”

Section: Testing the Models And Further Improvementsmentioning

confidence: 99%

“…They argue that this offset is due to an underestimation of approximately 30 % of N(H) in the case of Nai D-lines observations. Recapitulating, one has Hakkila et al (1997) are plotted as grey crosses, those of the analytical model as black triangles. While the scatter at low distances is relatively small, the analytical model has a larger spread at larger distances.…”

Section: The Inhomogeneously Distributed Ismmentioning

confidence: 99%

“…Hakkila et al (1997) put several extinction studies carefully together in an easily accessible routine. All studies have been modified to statistically account for unsampled regions.…”

Section: The Inhomogeneously Distributed Ismmentioning

confidence: 99%

“…The often large mean error values illustrate the disagreement among individual observations. The model by Hakkila et al (1997) is a large scale model, capable of identifying e.g. molecular clouds at intermediate distances, but not sensitve to extinction variations of less than 1 degree.…”

Section: The Inhomogeneously Distributed Ismmentioning

confidence: 99%

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Isolated Neutron Stars: From the Surface to the Interior

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The Magnificent Seven have all been discovered by their exceptional soft X-ray spectra and high ratios of X-ray to optical flux. They all are considered to be nearby sources. Searching for similar objects with larger distances, one expects larger interstellar absorption resulting in harder X-ray counterparts. Current interstellar absorption treatment depends on chosen abundances and scattering cross-sections of the elements as well as on the 3D distribution of the interstellar medium. After a discussion of these factors we use the comprehensive 3D measurements of the Local Bubble by Lallement et al. (2003) to construct two simple models of the 3D distribution of the hydrogen column density. We test these models by using a set of soft X-ray sources with known distances. Finally, we discuss possible applications for distance estimations and population synthesis studies.

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“…5). Fitzgerald 1968) in the routine by Hakkila et al (1997). The analytical model tends to overpredict the extinction by an order of magnitude, especially at larger distances.…”

Section: Testing the Models And Further Improvementsmentioning

confidence: 96%

Section: Testing the Models And Further Improvementsmentioning

confidence: 99%

Section: The Inhomogeneously Distributed Ismmentioning

confidence: 99%

“…Hakkila et al (1997) put several extinction studies carefully together in an easily accessible routine. All studies have been modified to statistically account for unsampled regions.…”

Section: The Inhomogeneously Distributed Ismmentioning

confidence: 99%

Section: The Inhomogeneously Distributed Ismmentioning

confidence: 99%

See 3 more Smart Citations

The Magnificent Seven in the dusty prairie

Posselt

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Haberl

et al. 2007

Isolated Neutron Stars: From the Surface to the Interior

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An analysis of early spectroscopic observations and the light curve of the nova V1663 Aql (Nova Aql 2005)

Poggiani

2006

Astron. Nachr.

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I report the results of a spectroscopic follow-up of the nova V1663 Aql performed at the Loiano telescope. The emission lines in the spectra have been identified to study the early evolution. The spectra measured some weeks after the maximum show Balmer lines, several Fe multiplets and low ionization lines. The presence of Fe multiplets confirms the original classification of V1663 Aql as a Fe II nova. I have built the light curve using the observations of IAU circulars, VSNET, AFOEV, ASAS databases to estimate the parameters of the nova: time and magnitude of maximum, and the decline rates by two or three magnitudes. The parameters have been used to deduce a distance of V1663 Aql in the range 7.3 divided by 11.3 kpc. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Field optimization and CCD data simulation for the antarctic International Concordia Explorer Telescope (ICE‐T)

2009

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We performed extensive data simulations for the planned ultra-wide-field, high-precision photometric telescope ICE-T (International Concordia Explorer Telescope). ICE-T consists of two 60 cm-aperture Schmidt telescopes with a joint field of view simultaneously in two photometric bandpasses. Two CCD cameras, each with a single 10.3k×10.3k thinned backilluminated device, would image a sky field of 65 square degrees. Given a location of the telescope at Dome C on the East Antarctic Plateau, we searched for the star fields that best exploit the technical capabilities of the instrument and the site. We considered the effects of diurnal air mass and refraction variations, solar and lunar interference, interstellar absorption, overexposing of bright stars and ghosts, crowding by background stars, and the ratio of dwarf to giant stars in the field. Using NOMAD, SSA, Tycho-2 and 2MASS-based stellar positions and BV IJH magnitudes for these fields, we simulated the effects of the telescope's point-spread-function, the integration, and the co-addition times. Simulations of transit light curves are presented for the selected star fields and convolved with the expected instrumental characteristics. For the brightest stars, we showed that ICE-T should be capable of detecting a 2 R Earth Super Earth around a G2 solartype star, as well as an Earth around an M0-star -if these targets were as abundant as hot Jupiters. Simultaneously, the telescope would monitor the host star's surface activity in an astrophysically interpretable manner.

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A Computerized Model of Large-Scale Visual Interstellar Extinction

Cited by 186 publications

References 0 publications

The Magnificent Seven in the dusty prairie

The Magnificent Seven in the dusty prairie

An analysis of early spectroscopic observations and the light curve of the nova V1663 Aql (Nova Aql 2005)

Field optimization and CCD data simulation for the antarctic International Concordia Explorer Telescope (ICE‐T)

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