Ly-alpha emitters (LAEs) are seen everywhere in the redshift domain from
local to z~7. Far-infrared (FIR) counterparts of LAEs at different
epochs could provide direct clues on dust content, extinction, and
spectral energy distribution (SED) for these galaxies. We search for FIR
counterparts of LAEs that are optically detected in the GOODS-North
field at redshift z~2.2 using data from the Herschel Space Telescope
with the Photodetector Array Camera and Spectrometer (PACS). The LAE
candidates were isolated via color-magnitude diagram using the
medium-band photometry from the ALHAMBRA Survey,…
We report the discovery of peculiar features in the optical spectrum of
4C+22.25, a flat spectrum radio quasar at z=0.4183 observed in the SDSS
and in a dedicated spectroscopic follow-up from the Nordic Optical
Telescope. The Hbeta and Halpha lines show broad profiles (FWHM~12,000
km/s), faint fluxes and extreme offsets (Delta v=8,700+/-1,300 km/s)
with respect to the narrow emission lines. These features show no
significant variation in a time lag of ~3.1 yr (rest frame). We rule out
possible interpretations based on the superposition of two sources or on
recoiling black holes, and we…
Radial velocity studies have provided the majority of all exoplanet
discoveries. Using the radial velocity techniques on young stars suffers
from problems with magnetic activity jitter, which has been studied for
years, and the effects of circumstellar disks, which has remained
unstudied. Here we study the disk-embedded star BP Psc using high
resolution, high accuracy HARPS spectra. We derive radial velocities,
activity indices, and line profile information. We find that the
presence of a disk severely limits information about the star. We find
that even the line profiles are distorted by…
