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The low-mass end of the fundamental relation for gravitationally lensed star-forming galaxies at 1 < z < 6
Richard, Johan; Hjorth, Jens; Grillo, Claudio +6 more
We present Very Large Telescope/X-shooter spectra of 13 galaxies in the redshift range 1 ≲ z ≲ 6, which are strongly lensed by massive galaxy clusters. Spectroscopic redshifts are measured for nine galaxies, while three sources have redshifts determined from continuum breaks in their spectra. The stellar masses of the galaxies span four orders of …
Reconstruction of total solar irradiance 1974-2009
Jaffe, A. H.; Krivova, N. A.; Solanki, S. +4 more
Context. The study of variations in total solar irradiance (TSI) is important for understanding how the Sun affects the Earth's climate.
Aims: Full-disk continuum images and magnetograms are now available for three full solar cycles. We investigate how modelled TSI compares with direct observations by building a consistent modelled TSI datase…
The Impact of Evolving Infrared Spectral Energy Distributions of Galaxies on Star Formation Rate Estimates
Berta, S.; Magnelli, B.; Nordon, R. +27 more
We combine Herschel-Photodetector Array Camera and Spectrometer (PACS) data from the PACS Evolutionary Probe (PEP) program with Spitzer 24 µm and 16 µm photometry and ultra deep Infrared Spectrograph (IRS) mid-infrared spectra to measure the mid- to far-infrared spectral energy distribution (SED) of 0.7 < z < 2.5 normal star-form…
Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library
Koleva, M.; Vazdekis, A.
Context. The spectral predictions of stellar population models are not as accurate in the ultra-violet (UV) as in the optical wavelength domain. One of the reasons is the lack of high-quality stellar libraries. The New Generation Stellar Library (NGSL), recently released, represents a significant step towards the improvement of this situation.
The Molecular Gas Content of z = 3 Lyman Break Galaxies: Evidence of a Non-evolving Gas Fraction in Main-sequence Galaxies at z > 2
Aussel, H.; Daddi, E.; Elbaz, D. +10 more
We present observations of the CO[J = 3 → 2] emission toward two massive and infrared luminous Lyman break galaxies (LBGs) at z = 3.21 and z = 2.92, using the IRAM Plateau de Bure Interferometer, placing first constraints on the molecular gas masses (M gas) of non-lensed LBGs. Their overall properties are consistent with those of typica…
The COS-Halos Survey: Keck LRIS and Magellan MagE Optical Spectroscopy
Tripp, Todd M.; Prochaska, J. Xavier; Tumlinson, Jason +4 more
We present high signal-to-noise optical spectra for 67 low-redshift (0.1 < z < 0.4) galaxies that lie within close projected distances (5 kpc < ρ < 150 kpc) of 38 background UV-bright QSOs. The Keck LRIS and Magellan MagE data presented here are part of a survey that aims to construct a statistically sampled map of the physical state a…
The age of the Milky Way inner halo
Kalirai, Jason S.
The Milky Way galaxy has several components, such as the bulge, disk and halo. Unravelling the assembly history of these stellar populations is often restricted because of difficulties in measuring accurate ages for low-mass, hydrogen-burning stars. Unlike these progenitors, white dwarf stars, the `cinders' of stellar evolution, are remarkably sim…
SGRs and AXPs as Rotation-Powered Massive White Dwarfs
Malheiro, Manuel; Rueda, Jorge A.; Ruffini, Remo
SGR 0418+5729 is a ``Rosetta Stone'' for deciphering the energy source of Soft Gamma Ray Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs). We present a model based on canonical physics and astrophysics for SGRs and AXPs powered by massive highly magnetized rotating white dwarfs (WDs), in total analogy with pulsars powered by rotating neutron st…
A 200-Second Quasi-Periodicity After the Tidal Disruption of a Star by a Dormant Black Hole
Miller, J. M.; Reis, R. C.; Maitra, D. +4 more
Supermassive black holes (SMBHs; mass is greater than or approximately 105 times that of the Sun) are known to exist at the center of most galaxies with sufficient stellar mass. In the local universe, it is possible to infer their properties from the surrounding stars or gas. However, at high redshifts we require active, continuous accr…
The 60 Month All-sky Burst Alert Telescope Survey of Active Galactic Nucleus and the Anisotropy of nearby AGNs
Greiner, J.; Alexander, D. M.; Ajello, M. +3 more
Surveys above 10 keV represent one of the best resources to provide an unbiased census of the population of active galactic nuclei (AGNs). We present the results of 60 months of observation of the hard X-ray sky with Swift/Burst Alert Telescope (BAT). In this time frame, BAT-detected (in the 15-55 keV band) 720 sources in an all-sky survey of whic…