Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Alexandroff, Rachael M."'
Even when the direct view toward the active nucleus is obscured, nuclear emission propagating along other directions can scatter off surrounding material, become polarized and reach the observer. Spectropolarimetry can thus be an important tool in in
Externí odkaz:
http://arxiv.org/abs/2306.06303
Autor:
Dupuis, Christopher M., Borthakur, Sanchayeeta, Padave, Mansi, Jansen, Rolf A., Alexandroff, Rachael M., Heckman, Timothy M.
We present the discovery of a low-redshift damped Ly$\alpha$ (DLA) system in the spectrum of background starburst galaxy SDSS J111323.88+293039.3 ($z=0.17514$). The DLA is at an impact parameter of $\rm \rho=36~kpc$ from the star forming galaxy, SDSS
Externí odkaz:
http://arxiv.org/abs/2011.09565
Autor:
Somalwar, Jean, Johnson, Sean D., Stern, Jonathan, Goulding, Andy D., Greene, Jenny E., Zakamska, Nadia L., Alexandroff, Rachael M., Chen, Hsiao-Wen
Galactic-scale winds driven by active galactic nuclei (AGN) are often invoked to suppress star formation in galaxy evolution models, but the mechanisms driving these outflows are hotly debated. Two key AGN feedback models are (1) radiation pressure a
Externí odkaz:
http://arxiv.org/abs/2002.02454
Autor:
Zakamska, Nadia L., Sun, Ai-Lei, Strauss, Michael A., Alexandroff, Rachael M., Brandt, W. N., Chiaberge, Marco, Greene, Jenny E., Hamann, Fred, Liu, Guilin, Perrotta, Serena, Ross, Nicholas P., Wylezalek, Dominika
We present Hubble Space Telescope 1.4-1.6 micron images of the hosts of ten extremely red quasars (ERQs) and six type 2 quasar candidates at z=2-3. ERQs, whose bolometric luminosities range between 10^47 and 10^48 erg/sec, show spectroscopic signs of
Externí odkaz:
http://arxiv.org/abs/1907.10617
Current models of galaxy formation require star formation in high-mass galaxies to be limited by poorly understood mechanisms of quasar feedback. Feedback processes can be studied by examining the molecular gas content of AGN hosts through the CO rot
Externí odkaz:
http://arxiv.org/abs/1904.03197
Autor:
Alexandroff, Rachael M., Zakamska, Nadia L., Barth, Aaron J., Hamann, Fred, Strauss, Michael A., Krolik, Julian, Greene, Jenny E., Paris, Isabelle, Ross, Nicholas P.
Spectropolarimetry is a powerful technique that has provided critical support for the geometric unification model of local active galactic nuclei. In this paper, we present optical (rest-frame UV) Keck spectropolarimetry of five luminous obscured (Ty
Externí odkaz:
http://arxiv.org/abs/1806.10138
Autor:
Hwang, Hsiang-Chih, Zakamska, Nadia L., Alexandroff, Rachael M., Hamann, Fred, Greene, Jenny E., Perrotta, Serena, Richards, Gordon T.
Most active galactic nuclei (AGNs) are radio-quiet, and the origin of their radio emission is not well-understood. One hypothesis is that this radio emission is a by-product of quasar-driven winds. In this paper, we present the radio properties of 10
Externí odkaz:
http://arxiv.org/abs/1803.02821
Autor:
Goulding, Andy D., Zakamska, Nadia L., Alexandroff, Rachael M., Assef, Roberto J., Banerji, Manda, Hamann, Fred, Wylezalek, Dominika, Brandt, William N., Greene, Jenny E., Lansbury, George B., Paris, Isabelle, Richards, Gordon, Stern, Daniel, Strauss, Michael A.
Quasars may have played a key role in limiting the stellar mass of massive galaxies. Identifying those quasars in the process of removing star formation fuel from their hosts is an exciting ongoing challenge in extragalactic astronomy. In this paper
Externí odkaz:
http://arxiv.org/abs/1802.04272
Autor:
Hamann, Fred, Zakamska, Nadia L., Ross, Nicholas, Paris, Isabelle, Alexandroff, Rachael M., Villforth, Carolin, Richards, Gordon T., Herbst, Hanna, Brandt, W. Niel, Cook, Ben, Denney, Kelly D., Greene, Jenny E., Schneider, Donald P., Strauss, Michael A.
Red quasars are candidate young objects in an early transition stage of massive galaxy evolution. Our team recently discovered a population of extremely red quasars (ERQs) in the Baryon Oscillation Spectroscopic Survey (BOSS) that has a suite of pecu
Externí odkaz:
http://arxiv.org/abs/1609.07241
Autor:
Alexandroff, Rachael M., Zakamska, Nadia L., van Velzen, Sjoert, Greene, Jenny E., Strauss, Michael A.
We study the radio properties of moderately obscured quasars over a range of redshifts to understand the role of radio activity in accretion using the Jansky Very Large Array (JVLA) at 6.0GHz and 1.4GHz. Our z~2.5 sample consists of optically-selecte
Externí odkaz:
http://arxiv.org/abs/1603.07325