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We compare red clump stars with parallaxes known to better than 10% in the Hipparcos catalog and corrected for the interstellar extinction, with the OGLE red clump stars in Baade's Window also corrected for the interstellar extinction.…

Astrophysics · Physics 2009-10-30 Bohdan Paczynski , K. Z. Stanek

We report observations of the linear polarisation of a sample of 50 nearby southern bright stars measured to a median sensitivity of $\sim$4.4 $\times 10^{-6}$. We find larger polarisations and more highly polarised stars than in the…

Solar and Stellar Astrophysics · Physics 2017-03-29 Daniel V. Cotton , Jeremy Bailey , Lucyna Kedziora-Chudczer , Kimberly Bott , P. W. Lucas , J. H. Hough , Jonathan P. Marshall

In this study, we derived a galactic extinction map in high ecliptic latitudes for |\beta| > 30 degrees. The dust temperature distribution was derived from the intensities at 100 and 140 \mu m with a spatial resolution of 5'. The intensity…

Astrophysics of Galaxies · Physics 2015-06-12 Tsunehito Kohyama , Hiroshi Shibai , Misato Fukagawa , Takahiro Sumi , Yasunori Hibi

We present a comparison of the gas and dust properties of the dense interstellar matter in six nearby star-forming regions (d<500 pc): rho Oph, Cha I, R CrA, IC 348, NGC 1333, and Orion. We measure from Chandra and XMM-Newton observations…

Fundamental properties of the extinction curve, like the slope in the rest-frame ultraviolet (UV) and the presence/absence of a broad absorption excess centred at 2175 A (the UV bump), are investigated for a sample of 108 massive,…

Astrophysics · Physics 2009-11-13 S. Noll , D. Pierini , M. Pannella , S. Savaglio

For aspherical interstellar dust grains aligned with their short axes preferentially parallel to the local magnetic field, the amount of extinction per grain is larger when the magnetic field is along the line of sight and smaller when in…

Astrophysics of Galaxies · Physics 2024-11-27 Brandon S. Hensley

Using a grid of empirically calibrated synthetic spectra developed in our previous study, we construct an all-sky 3D extinction map from the large collection of low-resolution XP spectra in Gaia DR3. Along each line of sight, with an area…

Astrophysics of Galaxies · Physics 2024-09-27 Deokkeun An , Timothy C. Beers , Anirudh Chiti

We use slit spectroscopy of overlapping pairs of galaxies to directly determine the extinction in disks of foreground spiral galaxies. The Doppler shifts of pair members are determined via cross-correlation and their relative correlation…

Astrophysics · Physics 2009-10-31 Donovan L. Domingue , William C. Keel , Raymond E. White

We determine 37 differential extinctions in 23 gravitational lens galaxies over the range 0 < z_l < 1. Only 7 of the 23 systems have spectral differences consistent with no differential extinction. The median differential extinction for the…

Far-infrared polarized emission by means of magnetically aligned dust grains is an excellent tracer of the magnetic fields (B-fields) in the cold phase of the galactic outflows in starburst galaxies. We present a comprehensive study of the…

Astrophysics of Galaxies · Physics 2023-08-16 Enrique Lopez-Rodriguez

We use the Spitzer IRAC catalogue of the Galactic Center (GC) point sources (Ramirez et al. 2008) and combine it with new isochrones (Marigo et al. 2008) to derive extinctions based on photometry of red giants and asymptotic giant branch…

Astrophysics · Physics 2009-11-13 M. Schultheis , K. Sellgren , S. Ramirez , S. Stolovy , S. Ganesh , I. S. Glass , L. Girardi

We measure the extinction law in a galaxy's spiral arm and interarm regions using a visual and infrared (BVRJHK) imaging study of the interacting galaxies NGC 2207 and IC 2163. This is an overlapping spiral galaxy pair in which NGC 2207…

Astrophysics · Physics 2016-08-30 Andreas A. Berlind , A. C. Quillen , R. W. Pogge , K. Sellgren

Photoelectric magnitudes and color indices in the Vilnius seven-color system for 152 stars are used to investigate the interstellar extinction in the area of the Aries molecular cloud MBM 12, coinciding with the L1454 and L1457 dust clouds.…

Astrophysics · Physics 2007-05-23 V. Straizys , K. Cernis , A. Kazlauskas , V. Laugalys

The $Herschel$ Space telescope carried out an unprecedented survey of nearby stars for debris disks. The dust present in these debris disks scatters and polarizes stellar light in the visible part of the spectrum. We explore what can be…

Earth and Planetary Astrophysics · Physics 2019-02-12 Julien Vandeportal , Pierre Bastien , Amélie Simon , Jean-Charles Augereau , Émilie Storer

The dust extinction curve is a critical component of many observational programs and an important diagnostic of the physics of the interstellar medium. Here we present new measurements of the dust extinction curve and its variation towards…

Polarimetry of stars at optical and near-infrared wavelengths is an invaluable tool for tracing interstellar dust and magnetic fields. Recent studies have demonstrated the power of combining stellar polarimetry with distances from the Gaia…

Magnitude-limited samples of spiral galaxies drawn from the Ursa Major and Pisces clusters are used to determine their extinction properties as a function of inclination. Imaging photometry is available for 87 spirals in B,R,I and K' bands.…

We present optical and near-infrared stellar polarization observations toward the dark filamentary clouds associated with IC5146. The data allow us to investigate the dust properties (this paper) and the magnetic field structure (Paper II).…

Astrophysics of Galaxies · Physics 2017-11-15 Jia-Wei Wang , Shih-Ping Lai , C. Eswaraiah , Dan P. Clemens , Wen-Ping Chen , A. K. Pandey

There is growing observational evidence of dust coagulation in the dense filaments within molecular clouds. Infrared observations show that the dust grains size distribution gets shallower and the relative fraction of small to large dust…

Astrophysics of Galaxies · Physics 2017-04-21 L. Beitia-Antero , Ana I. Gómez de Castro

The Sun lies in the middle of an enormous cavity of a million degree gas, known as the Local Bubble. The Local Bubble is surrounded by a wall of denser neutral and ionized gas. The Local Bubble extends around 100 pc in the plane of Galaxy…

Astrophysics of Galaxies · Physics 2015-11-24 Jacco Th. van Loon , Amin Farhang , Atefeh Javadi , Mandy Bailey , Habib Khosroshahi