Search Publications
The ACS LCID Project. IV. Detection of the Red Giant Branch Bump in Isolated Galaxies of the Local Group
Hidalgo, S. L.; Monelli, M.; Skillman, E. D. +4 more
We report the detection and analysis of the red giant branch (RGB) luminosity function bump in a sample of isolated dwarf galaxies in the Local Group. We have designed a new analysis approach comparing the observed color-magnitude diagrams (CMDs) with theoretical best-fit CMDs derived from precise estimates of the star formation histories of each …
XMM-Newton and FUSE Tentative Evidence for a WHIM Filament Along the Line of Sight to PKS 0558-504
Papadakis, I.; Elvis, M.; Nicastro, F. +5 more
We present a possible O VIII X-ray absorption line at z = 0.117 ± 0.001 which, if confirmed, will be the first one associated with a broad H I Lyβ (BLB: FWHM = 160+50 -30 km s-1) absorber. The absorber lies along the line of sight to the nearby (z = 0.1372) Seyfert 1 galaxy PKS 0558-504, consistent with being a WHI…
NGC 2992 in an X-ray High State Observed by XMM-Newton: Response of the Relativistic Fe Kα Line to the Continuum
Zheng, W.; Braito, V.; Yaqoob, T. +3 more
We present the analysis of an XMM-Newton observation of the Seyfert galaxy NGC 2992. The source was found in its highest level of X-ray activity yet detected, a factor ~23.5 higher in the 2-10 keV flux than the historical minimum. NGC 2992 is known to exhibit X-ray flaring activity on timescales of days to weeks, and the XMM-Newton data provide at…
Spectral energy distribution of hyperluminous infrared galaxies
Miniutti, G.; Carrera, F. J.; Panessa, F. +1 more
Aims: The relationship between star formation and super-massive black hole growth is central to our understanding of galaxy formation and evolution. Hyperluminous infrared galaxies (HLIRG) are unique laboratories to investigate the connection between starburst (SB) and active galactic nuclei (AGN), because they exhibit extreme star-formation …
The evolutionary status of the UX Orionis star RZ Piscium
Grinin, V. P.; Potravnov, I. S.; Musaev, F. A.
The star RZ Psc is one of the most enigmatic members of the UX Ori star family. It shows all properties that are typical for these stars (the light variability, high linear polarization in deep minima, the blueing effect) except for one: it lacks any signatures of youth. With the lithium line 6708 Å as a rough estimate for the stellar age, we show…
Herschel-ATLAS: far-infrared properties of radio-selected galaxies
Rodighiero, G.; Ivison, R. J.; Clements, D. L. +41 more
We use the Herschel-Astrophysical Terahertz Large Area Survey (ATLAS) science demonstration data to investigate the star formation properties of radio-selected galaxies in the GAMA-9h field as a function of radio luminosity and redshift. Radio selection at the lowest radio luminosities, as expected, selects mostly starburst galaxies. At higher rad…
Chemical origins of the Mars ultraviolet dayglow
Slanger, Tom G.; Sharpee, Brian D.; Fox, Jane L. +1 more
A New Investigation of the Binary HD 48099
Martins, F.; Gosset, E.; Nazé, Y. +5 more
With an orbital period of about 3.078 days, the double-lined spectroscopic binary HD 48099 is, until now, the only short-period O+O system known in the Mon OB2 association. Even though an orbital solution has already been derived for this system, few information are available about the individual stars. We present, in this paper, the results of a …
HerMES: Herschel-SPIRE observations of Lyman break galaxies
Aussel, H.; Elbaz, D.; Pérez-Fournon, I. +64 more
We present first results of a study of the submillimetre (submm) (rest-frame far-infrared) properties of z ~ 3 Lyman break galaxies (LBGs) and their lower redshift counterparts BX/BM galaxies, based on Herschel-SPIRE observations of the Northern field of the Great Observatories Origins Deep Survey (GOODS-N). We use stacking analysis to determine t…
Water abundances in high-mass protostellar envelopes: Herschel observations with HIFI
de Graauw, Th.; Liseau, R.; Braine, J. +68 more
Aims: We derive the dense core structure and the water abundance in four massive star-forming regions in the hope of understanding the earliest stages of massive star formation.
Methods: We present Herschel/HIFI observations of the para-H2O 111-000 and 202-111 and the para-H_218…