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Related papers: Mid-Infrared Extinction and its Variation with Gal…

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Observations of interstellar extinction and polarization indicate that the interstellar medium consists of aligned non-spherical dust grains which show variation in the interstellar extinction curve for wavelengths ranging from NIR to UV.…

Astrophysics · Physics 2009-09-15 Ranjan Gupta , Tadashi Mukai , D. B. Vaidya , Asoke K. Sen , Yasuhiko Okada

We report first results for the cosmic infrared background (CIB) fluctuations at 1.25, 1.65 and 2.17 micron obtained from long exposures constructed from 2MASS standard star fields. We have co-added and analyzed scans from one such field…

Astrophysics · Physics 2009-11-07 A. Kashlinsky , S. Odenwald , J. Mather , M. F. Skrutskie , R. M. Cutri

Intrigued by the extended red-giant clump (RC) stretching across the colour-magnitude diagram of the stars in a 50x50 pc^2 region of the Large Magellanic Cloud (LMC) containing the clusters NGC 1938 and NGC 1939, we have studied the stellar…

Astrophysics of Galaxies · Physics 2020-08-26 Guido De Marchi , Nino Panagia , Antonino P. Milone

We present spectroscopic tests of MIR to FIR extinction laws in IRDC G028.36+00.07, a potential site of massive star and star cluster formation. Lim & Tan (2014) developed methods of FIR extinction mapping of this source using ${\it…

Astrophysics of Galaxies · Physics 2015-11-17 Wanggi Lim , Sean J. Carey , Jonathan C. Tan

We report results of our near-IR survey for variables in a field of view of 20 arcmin by 30 arcmin towards the Galactic Center (GC), where we detected 1364 long-period variables. We have established a method for the simultaneous estimation…

Solar and Stellar Astrophysics · Physics 2015-05-13 Noriyuki Matsunaga , IRSF/SIRIUS team

In this paper I review a series of observations which do not agree with the standard interpretation of the extinction curve. The consequence is that light we receive from a reddened star must be contaminated by starlight scattered at very…

Astrophysics · Physics 2009-11-07 Frederic Zagury

We have determined extinction corrections for a sample of 441 late-type stars in the inner Galaxy, which we previously searched for SiO maser emission, using the 2MASS near-infrared photometry of the surrounding stars. From this, the…

Astrophysics · Physics 2009-11-10 M. Messineo , H. J. Habing , K. M. Menten , A. Omont , L. O. Sjouwerman , F. Bertoldi

We determine the interstellar extinction in the selected high-latitude areas of the sky based on Gaia EDR3 astrometry and photometry and spectroscopic data from RAVE survey. We approximate the results with the cosecant law in each area thus…

Astrophysics of Galaxies · Physics 2021-11-01 Aleksandra Avdeeva , Dana Kovaleva , Oleg Malkov , Alexey Nekrasov

[Abridged] We describe the near-infrared reddening signature of giant molecular clouds (GMCs) in external galaxies. In particular, we examine the E(J-H) and E(H-K) color-excesses, and the effective extinction law observed in discrete GMC…

Astrophysics · Physics 2009-11-13 Jouni Kainulainen , Mika Juvela , Joao Alves

Near-infrared properties of 451 galaxies with distances D \leq 10 Mpc are considered basing on the all-sky two micron survey (2MASS). A luminosity function of the galaxies in the K-band is derived within [-25,-11] mag. The local (D < 8 Mpc)…

Astrophysics · Physics 2009-11-10 I. D. Karachentsev , A. M. Kut'kin

We have cross-correlated Far Infrared (IRAS) and UV (FOCA) observations of galaxies to construct a sample of FIR selected galaxies with a UV observation at 0.2 microns. The FIR and UV properties of this sample are compared to the mean…

Astrophysics · Physics 2019-08-17 V. Buat , J. Donas , B. Milliard , C. Xu

In order to maximize the scientific return of the telescopes located at the Paranal Observatory, we analyse the properties of the atmosphere above Paranal in the near-infrared (NIR). We estimate atmospheric extinction in the spectral range…

Instrumentation and Methods for Astrophysics · Physics 2015-05-27 G. Lombardi , E. Mason , C. Lidman , A. O. Jaunsen , A. Smette

We have measured the extinction curve in the far-ultraviolet wavelength region of (900 -- 1200 A) using spectra obtained with the Berkeley EUV/FUV spectrometer during the ORFEUS-I and the ORFEUS-II missions in 1993 and 1996. From the…

Astrophysics · Physics 2009-11-07 T. P. Sasseen , M. Hurwitz , W. V. Dixon , S. Airieau

It is well known that the extinction properties along lines of sight to Type Ia supernovae are described by steep extinction curves with unusually low total-to-selective extinction ratios of Rv = 1.0-2.0. In order to reveal the properties…

Astrophysics of Galaxies · Physics 2016-12-07 Takaya Nozawa

We propose a general method for mapping the extinction in dense molecular clouds using 2MASS near-infrared data. The technique is based on the simultaneous utilization of star counts and colors. These two techniques provide independent…

Astrophysics · Physics 2009-11-07 L. Cambresy , C. A. Beichman , T. H. Jarrett , R. M. Cutri

Interstellar dust extinction law is essential for interpreting observations. In this work, we investigate the ultraviolet (UV)--mid-infrared (IR) extinction law of the Taurus molecular cloud and its possible variations. We select 504,988…

Astrophysics of Galaxies · Physics 2023-08-07 Ling Li , Shu Wang , Xiaodian Chen , Qingquan Jiang

Using diffuse interstellar bands (DIBs) at 5780 A, 5797 A and 6613 A, visible in the high resolution spectra, and measuring their equivalent widths, we estimate the interstellar extinction toward seven symbiotic stars. We find $E_{B-V}$=…

Solar and Stellar Astrophysics · Physics 2020-06-29 R. K. Zamanov , V. D. Marchev , K. A. Stoyanov

Extinction maps are essential for tracing interstellar dust and enabling accurate stellar population studies in galaxies. Here, a high-resolution extinction distribution of nearby galaxy M33 is constructed by fitting multiband color indexes…

Astrophysics of Galaxies · Physics 2026-04-09 Yuxi Wang , Yi Ren , Jian Gao , Bingqiu Chen , Ying Li

We have reanalyzed the Large Magellanic Cloud's (LMC) ultraviolet (UV) extinction using data from the IUE final archive. Our new analysis takes advantage of the improved signal--to--noise of the IUE NEWSIPS reduction, the exclusion of stars…

Astrophysics · Physics 2009-10-31 K. A. Misselt , Geoffrey C. Clayton , Karl D. Gordon

We use very deep near-infrared photometry of the Hubble Deep Field South taken with ISAAC/VLT to identify a population of high redshift galaxies with rest- frame optical colors similar to those of nearby galaxies. The galaxies are chosen by…

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