The analysis of the physical properties of low-redshift Lyα
emitters (LAEs) can provide clues in the study of their high-redshift
analogs. At z ~ 0.3, LAEs are bright enough to be detected over almost
the entire electromagnetic spectrum and it is possible to carry out a
more precise and complete study than at higher redshifts. In this work,
we examine the UV and IR emission, dust attenuation, star formation rate
(SFR), and morphology of a sample of 23 GALEX-discovered star-forming
LAEs at z ~ 0.3 with direct UV (GALEX), optical (ACS), and FIR (PACS and MIPS) data. Using the same UV and IR…
We have started a project to investigate the connection of post-novae
with the population of cataclysmic variables (CVs). Our first steps in
this concern improving the sample of known post-novae and their
properties. Here we present the recovery and/or confirmation of the old
novae MT Cen, V812 Cen, V655 CrA, IL Nor, V2109 Oph, V909 Sgr, V2572 Sgr
and V728 Sco. Principal photometric and spectroscopic properties of
these systems are discussed. We find that V909 Sgr is a probable
magnetic CV, and that V728 Sco is a high-inclination system. We
furthermore suggest that the two candidate novae…
Context. The connection between active galactic nuclei (AGN) and their
host galaxies has been widely studied and found to be of great
importance for providing answers to some fundamental questions related
to AGN fuelling mechanisms, and both their formation and evolution. <BR
/> Aims: Using X-ray data and one of the deepest broad-band optical data
sets available, we study how morphology and colours are related to X-ray
properties for sources at redshifts z ≤ 2.0, using a sample of 262 AGN in the Subaru/XMM-Newton Deep Survey (SXDS). <BR /> Methods: We
performed our morphological…
In this work we analyse the physical properties of a sample of 56
spectroscopically selected star-forming (SF) Lyα emitting galaxies
at 2.0 ≲ z ≲ 3.5 using both a spectral energy distribution
(SED) fitting procedure from rest-frame UV to mid-IR and direct 160
μm FIR observations taken with the Photodetector Array Camera and
Spectrometer (PACS) instrument onboard the Herschel Space Observatory.
We define LAEs as those Lyα-emitting galaxies whose rest-frame
Lyα equivalent widths (Lyα EW<SUB>rest – frame</SUB>) are
above 20 Å, the typical threshold in narrow-band…
Sono state effettuate riprese del campo del QSO J160500 nei filtri V ed R, oltre a riprese V ed R per i campi landolt di calibrazione.
Le misure effettuate hanno riguardato oltre al QSO anche 5 stelle di campo candidate comper per future misure in fotometria differenziale.
I risultati ottenuti sono buoni.
Si sono ricavate le magnitudini assolute delle comper e del QSO, per il quale è stata misurata una magnitudine R di 16,347 +/- 0,027. Sono presenti due punti che sono al di fuori dell'errore di misura, ma ancora non se ne capisce il motivo.
