Science Archives Publication System

Imaging and Spatially Resolved Spectroscopy of AFGL 2688 in the Thermal Infrared Region

DOI: 10.1086/340194 Bibcode: 2002ApJ...572..276G

Kobayashi, Naoto; Terada, Hiroshi; Goto, Miwa +1 more

We present ground-based high-resolution (~0.3") imaging of AFGL 2688 at L' (3.8 µm) and M' (4.7 µm). A wealth of structure in the central region is revealed as a consequence of less extinction in the thermal infrared. A clear border in the southern lobe at L' corresponds to the edge of the heavily obscured region in visible, indicating…

2002 • The Astrophysical Journal

eHST 17

Mid-Infrared and CO Observations of the Infrared/X-Ray Luminous Seyfert 1 Galaxy NGC 985: The Making or Breaking of a ULIRG?

DOI: 10.1086/338227 Bibcode: 2002ApJ...566..682A

Appleton, P. N.; Charmandaris, V.; Gao, Yu +4 more

We describe Infrared Space Observatory (ISO)1 and BIMA observations of the z=0.04 Seyfert 1 ring galaxy NGC 985 which suggest close parallels with some quasar host galaxies. NGC 985 contains two closely spaced nuclei embedded in an R^1/4-law stellar bulge and an outer ring, evidence of an ongoing merger. The system contains ~1.8×10^1…

2002 • The Astrophysical Journal

ISO eHST 17

Metal abundances and kinematics of quasar absorbers. I. Absorption systems toward J2233-606

DOI: 10.1051/0004-6361:20011807 Bibcode: 2002A&A...383..813L

Levshakov, S. A.; Agafonova, I. I.; Centurión, M. +1 more

The metal line profiles of different ions observed in high H I column density systems [N(H I) > 10¹⁶ cm^-2] in quasar spectra can be used to constrain the ionization structure and kinematic characteristics of the absorbers. For these purposes, a modified Monte Carlo Inversion (MCI) procedure was applied to the study of thre…

2002 • Astronomy and Astrophysics

eHST 17

Hubble Space Telescope Observations of the Windblown Nebula NGC 7635

DOI: 10.1086/344596 Bibcode: 2002AJ....124.3313M

Hester, J. Jeff; Dufour, Reginald J.; Scowen, Paul A. +3 more

We present Hubble Space Telescope observations of the northern part of NGC 7635, a circular shell around the O6.5 IIIf star BD +60°2522. The nebula, which lies within the large emission-line region S162, is notable not only for its symmetric shell, but also for a complex of ``cometary'' knots close to the central star. Our observations include spe…

2002 • The Astronomical Journal

eHST 17

Time variation of SWS spectra of M-type Mira variables and its dust optical properties. I. Z Cyg

DOI: 10.1051/0004-6361:20020574 Bibcode: 2002A&A...388..573O

Onaka, T.; Yamamura, I.; de Jong, T.

The M-type Mira variable star, Z Cyg, was observed with the Short-Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO) 7 times at roughly 60 day intervals over one and a half period. The infrared spectrum (2.38-45.2 mu m) of Z Cyg shows prominent silicate emission bands at 10 mu m and 18 mu m and displays quite large variati…

2002 • Astronomy and Astrophysics

ISO 17

Emission of Positron Annihilation Line Radiation by Clusters of Galaxies

DOI: 10.1086/340384 Bibcode: 2002ApJ...572..796F

Loeb, Abraham; Furlanetto, Steven R.

Clusters of galaxies are enriched with positrons from jets of active galactic nuclei (AGNs) or from the interaction of cosmic rays with the intracluster gas. We follow the cooling of these positrons and show that their eventual annihilation with cluster electrons yields a narrow annihilation line. Unlike annihilation in the interstellar medium of …

2002 • The Astrophysical Journal

INTEGRAL 17

XMM-Newton detection of Nova Muscae 1991 in quiescence

DOI: 10.1051/0004-6361:20020842 Bibcode: 2002A&A...391..993S

Kolb, U.; Casares, J.; Osborne, J. P. +7 more

The soft X-ray transient GU Mus has been detected by XMM-Newton in the quiescent state. The source is very faint, with a 0.5-10.0 keV unabsorbed flux of =~ 1.1 x 10^-14 ergs cm^-2 s^-1. The spectra is well fit by an absorbed powerlaw with a photon index of alpha = 1.6 +/- 0.4, close to the value seen when the source w…

2002 • Astronomy and Astrophysics

XMM-Newton 17

The stellar mass to light ratio in the isolated spiral NGC 4414

DOI: 10.1051/0004-6361:20020261 Bibcode: 2002A&A...387..429V

Braine, J.; Baudry, A.; Vallejo, O.

We present high resolution CO(1-0) interferometric observations and deep HST B-V-I images of the flocculent isolated Sc type spiral NGC 4414. The goal is to determine the stellar mass-to-light (M/L) ratio in a galactic disk. NGC 4414 is an ideal object for this kind of study, as it is an unperturbed object at high galactic latitude with very exten…

2002 • Astronomy and Astrophysics

eHST 17

Space Telescope Imaging Spectrograph Ultraviolet Spectroscopy of Early B Supergiants in M31

DOI: 10.1086/343072 Bibcode: 2002ApJ...580..213B

Bresolin, Fabio; Kudritzki, Rolf-Peter; Urbaneja, Miguel A. +4 more

We analyze Space Telescope Imaging Spectrograph (STIS) spectra in the 1150-1700 Å wavelength range obtained for six early B supergiants in the neighboring galaxy M31. Because of their likely high (nearly solar) abundance, these stars were originally chosen to be directly comparable to their Galactic counterparts and represent a much needed additio…

2002 • The Astrophysical Journal

IUE eHST 17

The host galaxies of Type Ia supernovae at z= 0.6

DOI: 10.1046/j.1365-8711.2002.05948.x Bibcode: 2002MNRAS.336L..17F

Farrah, D.; Rowan-Robinson, M.; Mattila, S. +2 more

We examine the host galaxies of high-redshift Type Ia supernovae (SNe Ia) using archival I- and R-band data from the Hubble Space Telescope. The SNe Ia host galaxies show a wide variety of morphologies, including undisturbed ellipticals, spirals and disturbed systems. SNe Ia are also found over a wide range of projected distances from the host gal…

2002 • Monthly Notices of the Royal Astronomical Society

eHST 17