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Star Formation around Mid-Infrared Bubble N37: Evidence of Cloud-Cloud Collision
Dewangan, L. K.; Ojha, D. K.; Baug, T. +1 more
We have performed a multi-wavelength analysis of a mid-infrared (MIR) bubble N37 and its surrounding environment. The selected 15‧ × 15‧ area around the bubble contains two molecular clouds (N37 cloud; {V}{lsr} ∼ 37-43 km s-1, and C25.29+0.31; {V}{lsr} ∼ 43-48 km s-1) along the line of sight. A total of …
About AGN ionization echoes, thermal echoes and ionization deficits in low-redshift Lyα blobs
Torrey, Paul; Fu, Hai; Davies, Rebecca L. +7 more
We report the discovery of 14 Lyα blobs (LABs) at z ∼ 0.3, existing at least 4-7 billion years later in the Universe than all other LABs known. Their optical diameters are 20-70 kpc, and GALEX data imply Lyα luminosities of (0.4-6.3) × 1043 erg s-1. Contrary to high-z LABs, they live in low-density areas. They are ionized by …
Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms
Russell, C. T.; Lavraud, B.; Anderson, B. J. +39 more
We report on field-aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near the plasma sheet boundary layer (PSBL) during two major substorms on 23 June 2015. Small-scale field-aligned currents were found embedded in fluctuating PSBL flux tubes near the separatrix region. We resolve, for the first time, short-lived …
Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1 < z < 4
Stern, D.; Seymour, N.; De Breuck, C. +5 more
High-redshift radio galaxies present signs of both star formation and AGN activity, making them ideal candidates to investigate the connection and coevolution of AGN and star formation in the progenitors of present-day massive galaxies. We make use of a sample of 11 powerful radio galaxies spanning 1 <z< 4 which have complete coverage of the…
Parameter splitting in dark energy: is dark energy the same in the background and in the cosmic structures?
Verde, Licia; Cuesta, Antonio J.; Bernal, José Luis
We perform an empirical consistency test of General Relativity/dark energy by disentangling expansion history and growth of structure constraints. We replace each late-universe parameter that describes the behavior of dark energy with two meta-parameters: one describing geometrical information in cosmological probes, and the other controlling the …
The infrared luminosities of ∼332 000 SDSS galaxies predicted from artificial neural networks and the Herschel Stripe 82 survey
Ellison, Sara L.; Mendel, J. Trevor; Rosario, David J. +1 more
The total infrared (IR) luminosity (LIR) can be used as a robust measure of a galaxy's star formation rate (SFR), even in the presence of an active galactic nucleus (AGN), or when optical emission lines are weak. Unfortunately, existing all sky far-IR surveys, such as the Infrared Astronomical Satellite (IRAS) and AKARI, are relatively …
How well can we measure supermassive black hole spin?
Gallo, L. C.; Bonson, K.
Being one of only two fundamental properties black holes possess, the spin of supermassive black holes (SMBHs) is of great interest for understanding accretion processes and galaxy evolution. However, in these early days of spin measurements, consistency and reproducibility of spin constraints have been a challenge. Here, we focus on X-ray spectra…
Measuring the basic parameters of neutron stars using model atmospheres
Werner, K.; Klochkov, D.; Poutanen, J. +1 more
Model spectra of neutron star atmospheres are nowadays widely used to fit the observed thermal X-ray spectra of neutron stars. This fitting is the key element in the method of the neutron star radius determination. Here, we present the basic assumptions used for the neutron star atmosphere modeling as well as the main qualitative features of the s…
Star Formation in 3CR Radio Galaxies and Quasars at z < 1
Wilkes, Belinda J.; Willner, S. P.; Haas, Martin +8 more
Using the Herschel Space Observatory we have observed a representative sample of 87 powerful 3CR sources at redshift z\lt 1. The far-infrared (FIR, 70-500 µm) photometry is combined with mid-infrared (MIR) photometry from the Wide-Field Infrared Survey Explorer and cataloged data to analyze the complete spectral energy distributions (SEDs) o…
A Tiny Eruptive Filament as a Flux-Rope Progenitor and Driver of a Large-Scale CME and Wave
Grechnev, V. V.; Fainshtein, V. G.; Kochanov, A. A. +5 more
A solar eruptive event SOL2010-06-13 observed with the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO) has been extensively discussed in the contexts of the CME development and an associated extreme-ultraviolet (EUV) wave-like transient in terms of a shock driven by the apparent CME rim. Continuing the analysis of this e…