%0 Generic %1 martin2014emission %A Martin, D. Christopher %A Chang, Daphne %A Matuszewski, Matt %A Morrissey, Patrick %A Rahman, Shahin %A Moore, Anna %A Steidel, Charles C. %D 2014 %K Lya cosmic emission imaging web %T IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow %U http://arxiv.org/abs/1402.4816 %X The Palomar Cosmic Web Imager (PCWI), an integral field spectrograph designed to detect and map low surface brightness emission, has obtained imaging spectroscopic maps of Ly-alpha from the circum-QSO medium (CQM) of QSO HS1549+19 at redshift of 2.843. Extensive extended emission is detected from the CQM, consistent with fluorescent and pumped Ly-alpha produced by the ionizing and Ly-alpha continuum of the QSO. Many features present in PCWI spectral images match those detected in narrow-band images. Filamentary structures with narrow line profiles are detected in several cases as long as 250-400 kpc. One of these is centered at a velocity redshifted with respect to the systemic velocity, and displays a spatially collimated and kinematically cold line profile increasing in velocity width approaching the QSO. This suggests that the filament gas is infalling onto the QSO, perhaps in a cold accretion flow. Because of the strong ionizing flux, the neutral column density is low, typically N(HI) is roughly 10E12-10E15/square-cm, and the line center optical depth is also low (typically tau0 is less than 10), insufficient to display well-separated double peak emission characteristic of higher line optical depths. With a simple ionization and cloud model we can very roughly estimate the total gas mass (log M(gas) equal to 12.5 +/- 0.5) and the total mass (log M(tot) equal to 13.3+/- 0.5). We can also calculate a kinematic mass from the total line profile (2x10E13 M(sun)), which agrees with the mass estimated from the gas emission. The intensity-binned spectrum of the CQM shows a progression in kinematic properties consistent with heirarchical structure formation.

@misc{martin2014emission, abstract = {The Palomar Cosmic Web Imager (PCWI), an integral field spectrograph designed to detect and map low surface brightness emission, has obtained imaging spectroscopic maps of Ly-alpha from the circum-QSO medium (CQM) of QSO HS1549+19 at redshift of 2.843. Extensive extended emission is detected from the CQM, consistent with fluorescent and pumped Ly-alpha produced by the ionizing and Ly-alpha continuum of the QSO. Many features present in PCWI spectral images match those detected in narrow-band images. Filamentary structures with narrow line profiles are detected in several cases as long as 250-400 kpc. One of these is centered at a velocity redshifted with respect to the systemic velocity, and displays a spatially collimated and kinematically cold line profile increasing in velocity width approaching the QSO. This suggests that the filament gas is infalling onto the QSO, perhaps in a cold accretion flow. Because of the strong ionizing flux, the neutral column density is low, typically N(HI) is roughly 10E12-10E15/square-cm, and the line center optical depth is also low (typically tau0 is less than 10), insufficient to display well-separated double peak emission characteristic of higher line optical depths. With a simple ionization and cloud model we can very roughly estimate the total gas mass (log M(gas) equal to 12.5 +/- 0.5) and the total mass (log M(tot) equal to 13.3+/- 0.5). We can also calculate a kinematic mass from the total line profile (2x10E13 M(sun)), which agrees with the mass estimated from the gas emission. The intensity-binned spectrum of the CQM shows a progression in kinematic properties consistent with heirarchical structure formation.}, added-at = {2014-02-28T03:26:09.000+0100}, author = {Martin, D. Christopher and Chang, Daphne and Matuszewski, Matt and Morrissey, Patrick and Rahman, Shahin and Moore, Anna and Steidel, Charles C.}, biburl = {https://www.bibsonomy.org/bibtex/285832661cfc6feca97a835b866c3041f/rasimcoe}, description = {[1402.4816] IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow}, interhash = {899ce8d8fe58298ce5315af2eddcfdc0}, intrahash = {85832661cfc6feca97a835b866c3041f}, keywords = {Lya cosmic emission imaging web}, note = {cite arxiv:1402.4816Comment: Running title: Cosmic Web Imager Observations of Gas Near QSO 1549+19, Accepted by the Astrophysical Journal, 62 pages, 33 figures}, timestamp = {2014-02-28T03:26:09.000+0100}, title = {IGM Emission Observations with the Cosmic Web Imager: I. The Circum-QSO Medium of QSO 1549+19, and Evidence for a Filamentary Gas Inflow}, url = {http://arxiv.org/abs/1402.4816}, year = 2014 }