Search Publications

Narrow-line H i and cold structures in the interstellar medium

Haud, U.

Context. Studying the H i line profiles in the Leiden-Argentina-Bonn (LAB) all-sky database, we have found a population of very cold H i clouds. So far, the role of these clouds in the interstellar medium (ISM) has remained unclear.
Aims: In this paper, we attempt to confirm the existence of the narrow-line H i emission (NHIE) clouds by using…

Search for galaxy-ICM interaction in rich clusters of galaxies

Shimasaku, K.; Gandhi, P.; Xu, Haiguang +7 more

Based on optical and X-ray data for a sample of 34 relaxed rich clusters with redshift of 0.1-0.9, we studied the relative spatial distribution of the two major baryon contents, the cluster galaxies and the hot plasmas. Using photometric data taken with the UH88 telescope, we determined the integrated radial light profiles of member galaxies in ea…

The Interstellar Sight-Line Towards the M33 Galaxy

Welsh, Barry Y.; Lallement, Rosine

Twenty-five Subarcsecond Binaries Discovered by Lunar Occultations

Cusano, F.; Richichi, A.; Fors, O. +1 more

We report on 25 subarcsecond binaries, detected for the first time by means of lunar occultations in the near-infrared (near-IR) as part of a long-term program using the ISAAC instrument at the ESO Very Large Telescope. The primaries have magnitudes in the range K = 3.8-10.4, and the companions in the range K = 6.4-12.1. The magnitude differences …

Star formation and dust extinction properties of local galaxies as seen from AKARI and GALEX

Buat, V.; Burgarella, D.; Takeuchi, T. T. +2 more

An accurate estimation of the star formation-related properties of galaxies is crucial for understanding the evolution of galaxies. In galaxies, ultraviolet (UV) light emitted by recently formed massive stars is attenuated by dust, which is also produced by star formation (SF) activity, and is re-emitted at mid- and far- infrared (IR) wavelengths.…

A near-infrared variability campaign of TMR-1: New light on the nature of the candidate protoplanet TMR-1C

Martín, E. L.; Monin, J. -L.; Riaz, B. +1 more

We present a near-infrared (NIR) photometric variability study of the TMR-1 system, a Class I protobinary located in the Taurus molecular cloud. Our aim is to confirm NIR variability for the candidate protoplanet, TMR-1C, located at a separation of about 10″ (~1000 AU) from the protobinary. We conducted a photometric monitoring campaign between Oc…

Interstellar Dust Models Towards Some IUE Stars

Gupta, R.; Katyal, N.; Vaidya, D. B.

We study the extinction properties of the composite dust grains, consisting of host silicate spheroids and graphite as inclusions, using discrete dipole approximation (DDA). We calculate the extinction cross sections of the composite grains in the ultraviolet spectral region, 1200Å-3200Åand study the variation in extinction as a function of the vo…

In-flight calibration and verification of the Planck-LFI instrument

Bersanelli, M.; Butler, R. C.; Cuttaia, F. +40 more

In this paper we discuss the Planck-LFI in-flight calibration campaign. After a brief overview of the ground test campaigns, we describe in detail the calibration and performance verification (CPV) phase, carried out in space during and just after the cool-down of LFI. We discuss in detail the functionality verification, the tuning of the front-en…

3.3 µm PAH observations of the central kiloparsecs of Centaurus A

Sturm, E.; Tacconi-Garman, L. E.

Aims: The aim of this work is to further investigate the nature of polycyclic aromatic hydrocarbon (PAH) excitation and emission especially in the context of tracing star formation in a variety of extragalactic environments. Here we turn our attention to the energetic environment of the closest active galactic nucleus (AGN) in our sample, Cen…

Dust attenuation in galaxies up to redshift ≃ 2

Buat, V.

We want to study dust attenuation at ultraviolet (UV) wavelengths at high redshift, where the UV is redshifted to the observed visible light wavelength range. In particular, we search for a bump at 2175 Å. We use photometric data in the Chandra Deep Field South (CDFS), obtained in intermediate and broad band filters by the MUSYC project, to sample…