Search Publications
Period-luminosity relations for Galactic Cepheid variables with independent distance measurements
Ngeow, Chow-Choong; Kanbur, Shashi M.
In this paper, we derive the period-luminosity (PL) relation for Galactic Cepheids with recent independent distance measurements from open cluster, Barnes-Evans surface brightness, interferometry and Hubble Space Telescope astrometry techniques. Our PL relation confirms the results from recent works, which showed that the Galactic Cepheids follow …
Arakelian 564: an XMM-Newton view
Brandt, W. N.; Fabian, A. C.; Boller, Th. +2 more
We report on two XMM-Newton observations of the bright narrow-line Seyfert 1 galaxy Ark 564 taken 1 yr apart (2000 June and 2001 June). The 0.6-10 keV continuum is well described by a soft blackbody component (kT~ 140-150 eV) plus a steep power law (Γ~ 2.50-2.55). No significant spectral changes are observed between the two observations, although …
Neutral hydrogen gas in interacting galaxies: the NGC 6221/6215 galaxy group
Koribalski, Bärbel; Dickey, John M.
Neutral hydrogen observations of the spiral galaxies NGC 6221 and 6215 with the Australia Telescope Compact Array (ATCA) reveal a wide, two-stranded bridge of at least 3 × 108 Msolar which can be traced between the two galaxies over a projected distance of 100 kpc. The velocity gradient of the HI bridge provides a rough estim…
Confusion noise at far-infrared to millimetre wavelengths
Negrello, M.; Magliocchetti, M.; De Zotti, G. +3 more
We present detailed predictions for the confusion noise due to extragalactic sources in the far-infrared/(sub)millimetre channels of the ESA/ISO, NASA/Spitzer, ESA/Herschel and ESA/Planck satellites, including the contribution from clustering of unresolved SCUBA galaxies. Compared to the case of purely Poisson fluctuations, clustering is found to …
A deeper view of extremely red galaxies: the redshift distribution in the GOODS/CDFS ISAAC field
McLure, R. J.; Dunlop, J. S.; Caputi, K. I. +1 more
We have analysed five-epoch Great Observatories Origins Deep Survey (GOODS) HST-ACS B, V, I775 and z data sets (v. 1.0 release), in conjunction with existing VLT-ISAAC imaging in the J, H and Ks bands, to derive estimated redshifts for the sample of 198 extremely red galaxies (ERGs) with Ks < 22 (Vega) and (I
The European Large Area ISO Survey - VIII. 90-µm final analysis and source counts
Pérez-Fournon, I.; Puget, J. -L.; del Burgo, C. +17 more
We present a re-analysis of the European Large Area Infrared Space Observatory (ISO) Survey (ELAIS) 90-µm observations carried out with ISOPHOT, an instrument on board the ISO of the European Space Agency. With more than 12 deg2, the ELAIS survey is the largest area covered by ISO in a single programme and is about one order of ma…
The European Large Area ISO Survey - IX. The 90-µm luminosity function from the Final Analysis sample
Serjeant, Stephen; La Franca, Fabio; Oliver, Seb +18 more
We present the 90-µm luminosity function of the Final Analysis of the European Large Area ISO Survey (ELAIS), extending the sample size of our previous analysis (Paper IV) by about a factor of 4. Our sample extends to z= 1.1, ~50 times the comoving volume of Paper IV, and 107.7 < h-2L/Lsolar < 1012…
The Canada-UK Deep Submillimetre Survey - VIII. Source identifications in the 3-hour field
Gear, Walter; Le Fèvre, Olivier; Dunne, Loretta +10 more
We present optical, near-infrared (IR) and radio observations of the 3-hour field of the Canada-UK Deep Submillimetre Survey (CUDSS). Of the 27 submillimetre sources in the field, nine have secure identifications with either a radio source or a near-IR source. We show that the percentage of sources with secure identifications in the CUDSS is consi…
XMM-Newton observations of the starburst merger galaxies NGC 3256 and NGC 3310
Zezas, A.; Roberts, T. P.; Ward, M. J. +1 more
We present XMM-Newton EPIC observations of the two nearby starburst merger galaxies NGC 3256 and NGC 3310. The broad-band (0.3-10 keV) integrated X-ray emission from both galaxies shows evidence of multiphase thermal plasmas plus an underlying hard non-thermal power-law continuum. NGC 3256 is well fitted with a model comprising two MEKAL component…
The spectral energy distributions of the revised 200-mJy sample
Bondi, M.; Browne, I. W. A.; Antón, S. +2 more
We address the question of why low-luminosity radio sources with similar flat radio spectra show a range of optical activity. The investigation is based on the spectral energy distributions (SEDs) of objects from the 200-mJy sample. We gathered new data from the VLA at 43 GHz, from SCUBA in the JCMT at 2000, 1350 and 850 µm, and from the ISO…