Search Publications
AGN are cooler than you think: the intrinsic far-IR emission from QSOs
Oliver, S. J.; Page, M. J.; Symeonidis, M. +4 more
We present an intrinsic AGN spectral energy distribution (SED) extending from the optical to the submm, derived with a sample of unobscured, optically luminous (νLν,5100 > 1043.5 erg s-1) QSOs at z < 0.18 from the Palomar Green survey. The intrinsic AGN SED was computed by removing the contribution from stars…
The evolved-star dust budget of the Small Magellanic Cloud: the critical role of a few key players
Boyer, M. L.; Meixner, M.; Kemper, F. +3 more
The life cycle of dust in the interstellar medium is heavily influenced by outflows from asymptotic giant branch (AGB) and red supergiant (RSG) stars, a large fraction of which is contributed by a few very dusty sources. We compute the dust input to the Small Magellanic Cloud (SMC) by fitting the multi-epoch mid-infrared spectral energy distributi…
The near-to-mid infrared spectrum of quasars
Alonso-Herrero, Almudena; Hatziminaoglou, Evanthia; Hernán-Caballero, Antonio +1 more
We analyse a sample of 85 luminous (log (νLν(3 µm)/erg s-1) > 45.5) quasars with rest frame ∼2-11 µm spectroscopy from AKARI and Spitzer. Their high luminosity allows a direct determination of the near-infrared quasar spectrum free from host galaxy emission. A semi-empirical model consisting of a single templat…
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 …
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 …
Origin and evolution of two-component debris discs and an application to the q1 Eridani system
Kirchschlager, Florian; Booth, Mark; Krivov, Alexander V. +3 more
Many debris discs reveal a two-component structure, with an outer Kuiper-belt analogue and a warm inner component whose origin is still a matter of debate. One possibility is that warm emission stems from an `asteroid belt' closer in to the star. We consider a scenario in which a set of giant planets is formed in an initially extended planetesimal…
Hektor - an exceptional D-type family among Jovian Trojans
Nesvorný, D.; Brož, M.; Durda, D. D. +4 more
In this work, we analyse Jovian Trojans in the space of suitable resonant elements and we identify clusters of possible collisional origin by two independent methods: the hierarchical clustering and a so-called randombox. Compared to our previous work, we study a twice larger sample. Apart from Eurybates, Ennomos and 1996 RJ families, we have foun…
Evidence for a binary origin of a central compact object
Klochkov, Dmitry; Kavanagh, Patrick; Doroshenko, Victor +3 more
Central compact objects (CCOs) are thought to be young thermally emitting isolated neutron stars that were born during the preceding core-collapse supernova explosion. Here, we present evidence that at least in one case the CCO could have been formed within a binary system. We show that the highly reddened optical source IRAS 17287-3443, located 2…
YSO jets in the Galactic plane from UWISH2 - III. Jets and outflows in Cassiopeia and Auriga
Froebrich, D.; Makin, S. V.
We present the analysis of 35.5 deg2 of images in the 1-0 S(1) line of H2 from the UK Widefield Infrared Survey for H2 (UWISH2) towards Cassiopeia and Auriga. We have identified 98 Molecular Hydrogen emission-line Objects (MHOs) driven by Young Stellar Objects, 60 per cent of which are bipolar outflows and all are …
Period-Luminosity relations derived from the OGLE-III first-overtone mode Cepheids in the Magellanic Clouds
Ngeow, Chow-Choong; Kanbur, Shashi M.; Bhardwaj, Anupam +1 more
We present multiband Period-Luminosity (PL) relations for first-overtone mode Cepheids in the Small Magellanic Cloud (SMC). We derive optical band PL relations and the Wesenheit function using VI mean magnitudes from the Optical Gravitational Lensing Experiment (OGLE-III) survey. We cross-match OGLE-III first-overtone mode Cepheids to the 2MASS an…